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综合英语教程4第三版课后练习题含答案Part 1 阅读理解Passage 11.What is the mn idea of the passage?–The importance of exercising dly.2.According to the passage, what are the benefits ofexercising?–Improved physical health, reduced stress, and increased energy levels.3.What are some ways to incorporate exercise into your dlyroutine, according to the passage?–Taking the strs instead of the elevator, going for a walk or jog, and participating in sports.Passage 21.What is the mn idea of the passage?–The impact of technology on human communication.2.According to the passage, what are some of the negativeeffects of technology on communication?–Reduced face-to-face interaction, increased instances of miscommunication, and a lack of emotional connection.3.What are some ways to mitigate the negative effects oftechnology on communication, according to the passage?–Being mindful of your communication habits, setting aside time for face-to-face interaction, and usingtechnology to foster meaningful connections.Part 2 词汇选择1.A2.C3.B4.A5.D6.C7.A8.B9.C10. APart 3 语法填空1.has been2.am studying3.which4.to5.their6.It7.were8.who/that9.could10.to facePart 4 完型填空1.D2.A3.C4.A5.D6.B7.C8.A9.B10. DPart 5 书面表达Possible answer:Dear Professor Johnson,I am writing to express my interest in your course on Ancient Mediterranean Civilizations. As a history major, I have always been fascinated by the rich cultural traditions and complex societies of ancient civilizations. Your course seems to offer a comprehensive examination of the political, social, and economic structures of these cultures.One aspect of the course that particularly intrigues me is the emphasis on primary source analysis. I appreciate the opportunity to engage critically with sources from this time period and to gn a deeper understanding of these cultures through their own perspectives. Additionally, I am excited to participate in the class discussions andto learn from my fellow classmates who come from diverse backgrounds and have varying perspectives on the subject matter.I would be honored to be a part of your course and to learn under your guidance. Thank you for considering my application.Sincerely, [Your Name]。
大学英语综合课程(二)第四单元:QuizPart 1 Fill in the blanks with the help of the first letter(s)(每小题:1分,满分10分)Directions:Fill in the blanks with the help of the first letter(s).1。
Scientists attach a lot of importance to experiments as knowledge gained from research is often , inspirational,and generative。
(Suggested first letter(s):dy )2。
The concept that in families husband plays a _____________ role while wife plays an inferior role has been out of date for decades。
(Suggested first letter(s): su )3.The problem is they’ve always been hopeless at learning languages and they ________mispronounced the majority of words in English。
(Suggested first letter(s):con )4.I am surprised and regret to say that a company with good ____________for high—quality brand would produce such poor quality goods。
(Suggested first letter(s):re )5.Such ideas are offensive,not only because of an unthinking ___________,but also because of the horrors carried out by the Nazis in the name of improving their race.(Suggested first letter(s):dis )6。
人教版(PEP)小学英语五年级下册,Unit,1,My,day,Part,C同步测试(二)B卷人教版(PEP)小学英语五年级下册Unit1MydayPartC 同步测试(二)B卷姓名:________班级:________成绩:________小朋友们,经过一段时间的学习,你们一定进步不少吧,今天就让我们来检验一下!一、选出下列各组单词中不同类的选项。
(共1题;共2分)1.(2分)选出不同类的单词。
①________A.weB.youC.itD.sour②________A.amB.isC.yourD.are二、选出下列句子对应的图片。
(共1题;共2分)2.(2分)We________(should/could)stop________(cutting/cut)downsomanytrees.三、选出下列句子对应的汉语意思。
(共1题;共5分)3.(5分)Chooseandfillintheblanks.选词填空。
tablehungryeatfoodthirsty(1)Wehavesome________:meats,rice,noodles.(2)I'm________.Iwanttoeat.(3)LiMing'sschoolbagisonthe________.(4)I'm________.Iwanttodrink.(5)I________breakfastatseveninthemorning.四、选词填空。
(共1题;共10分)4.(10分)选出下列问句对应的答语。
A.Yes,Ilikeitverymuch.B.WinterIlikesnow.(1)Whichseasondoyoulikebest?(2)Doyoulikethemusic?五、单项选择。
(共2题;共4分)5.(2分)()A.Shewillgetupearly.B.Shewillplaywiththebear.C. Shewillcometomyhome.6.(2分)It'stime_________home.A.goB.togo六、根据图片提示补全对话。
定轴轮系齿轮传动有一对外啮合渐开线直齿圆柱体齿轮传动.已知 20,4,25,5021====αmm m z z ,两个齿轮的厚度都是50mm 。
⒈ 启动ADAMS双击桌面上ADAMS/View 的快捷图标,打开ADAMS/View 。
在欢迎对话框中选择“Create a new model ”,在模型名称(Model name )栏中输入:dingzhouluenxi ;在重力名称(Gravity )栏中选择“Earth Normal (-Global Y)”;在单位名称(Units )栏中选择“MMKS –mm,kg,N,s,deg ”。
如图1-1所示。
图1-1 欢迎对话框⒉ 设置工作环境2.1 对于这个模型,网格间距需要设置成更高的精度以满足要求。
在ADAMS/View 菜单栏中,选择设置(Setting )下拉菜单中的工作网格(Working Grid )命令。
系统弹出设置工作网格对话框,将网格的尺寸(Size )中的X 和Y 分别设置成750mm 和500mm ,间距(Spacing )中的X 和Y 都设置成50mm 。
然后点击“OK ”确定。
如图2-1所表示。
2.2 用鼠标左键点击选择(Select )图标,控制面板出现在工具箱中。
2.3 用鼠标左键点击动态放大(Dynamic Zoom )图标,在 模型窗口中,点击鼠标左键并按住不放,移动鼠标进行放大或缩小。
⒊创建齿轮3.1 在ADAMS/View 零件库中选择圆柱体(Cylinder )图标,参数选择为“NewPart ”,长度(Length )选择50mm (齿轮的厚度),半径(Radius )选择100mm (10025042z m 1=×=×) 。
如图3-1所示。
图 2-1 设置工作网格对话框 图3-1设置圆柱体选项3.2 在ADAMS/View 工作窗口中先用鼠标任意左键选择点(0,0,0)mm ,然后选择点(0,50,0)。
英语必修二第四单元Unit 4 Wildlife protectionThe topic of this unit is wild life protection,which is very important everywhere. It is concerned with the importance of wildlife protection and ways to protect wild plants and animals. It introduces some of the animals to students that are in danger which helps them know the importance of protecting wild animals and plants on the earth.Daisy `s story shows the problems of wildlife protection in three parts of the world: Tibet, Africa and the Brazilian rain forest. It also shows us an organization (WWW) which works all over the world for the wildlife protection.Vocabulary: wild wildlife, protection, decrease, loss, reserve, hunt, zone, carpet, respond, distant, fur, relief, laughter, mercy, certain, importance, rub, mosquito, insert, contain, powerful, affect, attention, succeed, secure, income, employ, harm, bite, inspect, incident, dust, fierce, ending, die out, in peace, in danger, in relief, burst into laughter, protect… from…, pay attention to, come into being, according to, so that Functions:I`m going to……I feel like doing……I would rather not……..I intend / mean / plan to…..I would like to ……I will do ………I am ready to …Apologies:I am so sorry that …..I am afraid that……Thank you very much but…..It is a shame that ……It was very nice of you but ……Grammar: the present progressive passive voiceThe first period: Warming up, Pre-reading, Reading and ComprehendingAbility aims: Develop the students` reading ability to enable them learn about the knowledge of wildlife protection and talk about endangered species.Important points: Get the students to read the passage How Daisy Learned to HelpWildlife and learn different reading skills.Difficult points: Develop their reading ability and enable them to talk about wildlife protection fluently.Step 1 Warming upWarm up the students` interest about wildlife protection by showing some pictures and then answer some questions.1). Can you name at least eight kinds of animals which live in your neighborhood? What habits and characteristics do they have?2). What problems are some wild animals in China facing?3). What has China done to solve the problems?4). How have things changed since China took action to protect wild animal?5). Have you ever watched Tibet antelopes on TV? What problems are these animals facing? What measures has our government taken to protect them?Step 2 Reading1. Read the text aloud to the tape for the main idea, and then fill in the table.How Daisy Learned to help WildlifeThe text is made up of 4 paragraphs and can be divided into 4 partsType of writing A narrative writingPart 1 (para. 1) Daisy visited Tibet where antelopes have been over-hunted.Part 2 (para. 2) Daisy came to Zimbabwe where animals were being killed.Part 3 (para.3) Daisy arrived in a forest which needs to be protected.Part 4 (para.4) Daisy returned home / earning wildlife.2. Scan the text for detailed information to do the following questions.1). Paragraph 1 suggests that _____.A. the number of the antelopes in Tibet is getting smaller now.B. Daisy would like to see the antelopes very much.C. the antelopes have all been killed for the wool and none was leftD. the antelopes have moved from Tibet to some other places2). Paragraph 2 suggests that _____.A. farmers in Zimbabwe once made a living by huntingB. farmers are not satisfied with the governmentC. the living conditions of elephants in Zimbabwe have been improvedD. animals in Zimbabwe find it interesting to take photos with tourists3). Which of the following is not true according to the passage?A. Daisy know little about wildlife protection before the visitB. the endangered animals will disappear in the near futureC. the WWF is an organization whose duty is to protect wildlifeD. animals are being threatened in different ways4). Which is the most probable reason why the monkey in the forest are dying out?A. there are too many touristsB. they are being killed or huntedC. their habitats are being destroyedD. there is no enough food for them5). From the end of the story we can conclude that _____.A. the WWF will help Daisy to make the powerful drugB. the WWF has done little to protect wildlifeC. people will stop killing animals with the help of the WWFD. Daisy will continue to help protect wildlife by working with the WWF3. Read it carefully for the detailed information and then fill in the form.What did Daisy see where she was?In Tibet in China Zimbabwe In thick rain forest4.根据课文内容填空Character Means of transport AimDaisy Flying carpet To see some endangered wildlife.Daisy’s JourneyAnimals Places situationsAn antelope Tibet They are being killed for their soft fur.An elephant Zimbabwe They used to be an endangered s pecies because o ffarmers’ too much hunting.Their numbers are increasing because they getprotection from the government.A monkey A thick rain-forest The monkey is rubbing a (n) millipede insect overits body to protect itself from mosquitoes, whichshows plants, animals and human beings livetogether by supporting each other.5. Deal with language problems students meet while checking the answers. Find out the useful collocations in the passage.long to do, endangered species of wildlife, wake up, find ….by one`s bed, a flying carpet, fly away to, use …. to make …., kill…for…., as a result, turn around, take one`s photos, in relief, burst into laughter, used to be, without mercy, destroy one`s farms, allow sb. to do sth. a certain number of…., make money for…, in thick rain forest, protect…from…., rub…over…., a powerful drug, pay attention to, take …..home….., be able to…..6. Do the exercise 1 and 2 in comprehending on page 27.Step 3 Dialogue:Ask students to read the passage again and then let them write dialogues in groups.(1)Group 1 write a dialogue between Daisy and Chair;(2) Group 2 write one between Daisy and Antelope;(3) Group 3 write one between Daisy and Elephant;(4) Group 4 write one between Daisy and Monkey.Step 4 Practice and performLet them practice their dialogue impairs and then before the class.Step 5 Closing down by matching animals to 5risk categoriesDifferent endangered species appear on different endangered species lists. All people who are trying to protect animals use the following 5 risk categories to group the unlucky animals:List o Unlucky animals found in China(中国不幸动物分类名录)EXTINCT(灭绝动物)—A species formerly indigenous to China that no longer exists anywhere.EXTIRPATED(根绝动物)—A species no longer existing in the wild in China but occurring elsewhere.ENDANGERED(濒危动物)—A species threatened with imminent extinction or extirpation throughout all or a significant portion of its China`s range.THREATENED(危急动物)—A species likely to become endangered in China if the factors affecting its vulnerability are not reversed.VUNERABLE(弱势动物)—A species particularly at risk because o f low or declining numbers, small range or for some other reason, but not a threatened species.Step 6 homeworkFinish off the exercises in the textbook.Learn all the useful words and expressions by heart.The second period: Learning about important language pointsThe emphasis of this period will be place on the important new words, expressions and sentence patterns in the former parts.Knowledge aims:1). Learn and grasp the new words and expressions: wild, wildlife, protection, decrease, lose, reserve, hunt, zone, carpet, respond, distant, fur, relief, mercy, certain, importance, rub, mosquito, insert, contain, powerful, affect, attention, succeed, secure, income, employ, harm, bite, inspect, incident, dust, fierce, ending, die out, in peace, in danger, in relief, burst into laughter, protect… from…, pay attention to, come into being, according to, so that.2). Let the students learn the following sentence patterns:As a result, these endangered animals may even die out.This is what wildlife protection is all about.I wonder what is being done to help you.We are being killed for the wool beneath our stomachs.We used to be endangered species.But I would like to help as the WWF suggests.Ability aims: get the students to use some useful words and expressions a nd enable them to make sentences after the useful sentence patterns.Important points: learn and use the useful words and expressions correctly.Difficult points: how to help them learn and use the words and expressions correctlyand enable them to understand the difficult sentences.Step 1 revisionCheck the homework exercises.Ask some students to perform their text play.Step 2 Reading and findingRead through all parts to underline all the collocations: look after, a good environment, as a result, die out, endangered animals, wildlife protection, in peace, in danger, long to do,endangered species of wildlife, wake up, find by one`s bed, a flying carpet, fly away to, use …to make…., kill…..for…., turn around, take one`s photos, in relief, burst into laughter, used to be, without mercy, destroy one`s farm, allow sb. to do sth….., a certain number of, make money for, in thick rain forest, protect ….from…., rub….over….., a powerful drug, pay attention to, take ….home, be able to…, such as…, move into, be concerned about, do harm toStep 3 Practice for the useful words and expressionsTurn to page 28 to do exercise 1-3. then check with them all in class.Step 4 V ocabulary study1.as a result: because of something that has happenedHe had some bad fish. As a result, he felt ill this morning.As a result of his hard work, he got a pay rise.Thousands of people lost their homes as a result of the big fire.2. die out: disappear completelyMany animals have died out in the past few years.He hid behind the door until the footsteps had died away.3. in danger:His life is in danger.Why are some species in danger of disappearing?The river is dangerous for swimmers.This machine is dangerous: the wiring is fault.out of dangeron the danger list4. respond: give a verbal or written answer; act in answer to or because of the action of another; react quickly or favorably, be easily controlled.She asked where he had been, but he didn`t respond.He responded to my volleyball with a backhand.The car responds well to the controls.Animals respond to kindness.5. protect: keep sb. or sth. safe from harm, injury,etc. defend sb. or sth. against sth.Protect home industriesProtect somebody from dangerHe raised his arms to protect himself.6. contain: have or hold within itselfPig iron may contain 4% of carbon.The bottle contains two pints.7. affect: have an effect on;A sudden change in weather may affect your health.His opinions will not affect my decision.Did the medicine have any effect?8. pay attention toPay attention to these sentences from the interview.My mother asked me to pay attention to the traffic when crossing the road.catch / call / draw / attract / invite one`s attentionbe all attentiondevote / direct one`s attention tofocus / center one`s attention onpay special attention toStep 5 sentence focus1.Do you know any other endangered wildlife in China that is being protected?that is being protected 是定语从句They produced a new record in 1996, with which they celebrated their former time asa real band.2.Daisy had always longed to help endangered species of wildlife.I am long to see you again.The children are longing for the holidays.She longed for him to ask her to dance.3. Please take me to a distant land where I can find the animals that gave fur to make this sweater.where I can find the animals / that gave fur to make this sweater是定语从句4. Our fur is being used to make sweaters for people like you.be used to do sth. 被用来作什么be used to doing sth. 习惯做什么used to do sth. 过去常常做什么5. It shows the importance of wildlife protection, but I`d like to help as the WWF suggests.as the WWF suggests是方式状语从句6. You pay more attention to the forest where I live and appreciate how the animals live together.where I live是定语从句how the animals live together是宾语从句7. No rain forest, no animals and no drugs.If there is no rain forest, there will be no animals and no drugs.Step 6 Using words and expressionsTurn to page 63 and do the exercises.Step 7 HomeworkFinish off the Workbook exercises.Learn the new words and expressions by heart.The third period: Learning about grammarThis teaching period mainly deal with the grammar: the present progressive passive voice.Knowledge aims: get the students to know the structure of the present progressive passive voice.Difficult points: get them to know and use the grammar clearly.Important points: how to help them learn the grammar easily.Step 1 revision1. Check the homework exercises.2. Dictate some useful words and expressions.Step 2 Grammar revision1. The passive voice: passive subject + be + past participle ( only verbs that take an object can be used in the passive voice), which focus on the person or thing when affected by an action.2. Turn the following into passive voice:1). They make Fords in Cologne.2). I will finish it tomorrow.3). They are going to build a new factory in Portland.4). They have produced over 29 models in the past two years.Step 3 practice1). Ask them to do Exercise 2 on page 29.2). Ask them to do Exercise 1-2 on page 64.Step 4 Consolidation.1).Read the text to find the sentences which includes the present progressive voice.2). Turn the following into passive voice.1). They are producing a new drug.→________________________________.2). Antelopes are looking at her.-→_________________________________.3). They are killing us for the wool.→_________________________________.4). They are destroying the farm.→_________________________________.Step 5 Closing down by playing a game.Ask some students to say some sentences which contain the present progressive voice.Step 6 HomeworkFinish off the Workbook exercises.Do Exercise 1 on page 64 in your exercise book.The forth period:Using Language:Extensive reading In this period,the teaching emphasis will be put on developing students` reading ability by reading extensively. We will deal with two parts: the passage about dinosaurs in Using language on page 30 and Reading task on page 65.Knowledge aims: get the students to learn some useful new words and expressions in this part: dinosaur, inspect, incident, dust, fierce, come into being, according to. Get them to learn about dinosaurs and deer.Important points: develop students` reading skills by extensive reading and let them read the two reading passage.Difficult points: enable students to learn to use reading strategies such as skimming, scanning, and so on to get them to finish their reading task.Step 1 Revision1. Check the homework exercises.2. Revise the form of the present progressive passive voice: passive subject + be + past participleStep 2 Leading in by looking and talking1. Show them some pictures of milu deer and talk about them.The milu deer, also called David`s deer, is an animal formerly unique to China. Ancient Chinese characters “mi” was one of the first to be engraved on tortoise-shell and animal bones. Later, throughout various dynasties, the animal was bred in imperial parks but, tragically , by 1900 it had become extinct in China. But 100 years later, David`s deer has returned.A look back at the history shows that tens of thousands of years of civilization achieved by man have been the cost of our natural environment. The wetland, home for the Milu deer dubbed the kidneys of the world. But centuries of devastations have led to series of soil erosion, depriving wetland animals of their habitats and the environment of one of its vital functions. The return of milu deer to China is a reminder to the Chinese people of the need to protect our mother earth.Something about dinosaurs:Dinosaurs first appeared about 200 million years ago, many kinds of dinosaurs became extinct. Birds are a special type of dinosaur and they were the only kind to live until today. The largest dinosaurs were plant-eaters like Apatosaurus and brachiosaurus. They were the largest animals to ever walk on dry land.Step 3 reading1. Fast read to get the main idea. ( it is mainly about species and the reasons for dinosaurs` dying out.)2. Read and answer:1). When did the dinosaurs die out?2). What is the rare new species dinosaur do?3). What could the rare new species dinosaur do?4). Why did the dinosaur die out?3.Read the text again to find out the useful collocations: during the history of the earth,live on earth, tens of millions of years ago, come into being, eggs of five species, a rare new species, a bird-like dinosaur, climb tree, tell….from…., die out, hit the earth, put ….into the air, get hot, live on, know for sure, in the same way, listen to the story about, disappear fromStep 4 Reading taskTurn to page 65. First, read the title and guess the meaning. Then read it carefully to get the main idea.Information for research into the milu deerAppearanceFeaturesReasons fordisappearanceThe Milu deer in BritainHow they returnedPresent situationValue of the cooperationStep 5 closing down by retelling1. Ask students to read the passage The Return of the Milu Deer again and prepare their stories.2. Ask as many students as possible to come to the front to retell their story.Step 6 HomeworkFinish off the workbook exercises.Learn the useful new words and expressions in this part by heart.The fifth period: Using Language: Listening, Speaking and WritingThe emphasis of this period is the story of how the dodo disappeared forever. It is not a real story but it is possible that it happened this way.Knowledge aims: get the students to learn the expressions of intentions and apologies by listening and understanding the listening materials.Difficult points: develop students` listening ability.Important points: develop students` listening ability and enable them to learn and use the useful expressions.Step 1 Revision1. Check the homework exercises.2. Dictate some useful words and expressions.Step 2 Warming upShow them the picture of the dodo and talk about it.By 1681, the last dodo died, and the species became extinct and it was regarded as a myth invented by imaginative sailor. Until the 1900`s when the bones were found, dodo was believed to be true. Today the dodo bird is a symbol of the harm humans can bring to other living things if we are irresponsible.Step 3 listeningTurn to page 30. Go through the exercises with the students and make them know what to do.Play the tape for them to listen and get the main idea by making notes while listening to the text.Step 4 Speaking1. Show the students the form to help them understand.Intention PurposeI am going to Help the dodoI intend / mean / plan to Hide it in a raceI will Trap man as he kills a dodoI feel like Attacking man myselfI would like to Put man in a caveI am ready to Teach man how to be friendsI would rather not tell you What I think of man2. Get them talk about how to help dodo in pairs.Step 5 Writing1. Ask them to write a passage under the heading to make a plan.1. How to protect dodo from man Help him by attacking man so he will leave the dodo alone; build a trap to catch man; result: man will not want to attack the dodo any more.2. How to stop man from killing dodos Go to another island; hide the dodo; result: dodos will a calm and peaceful live3. How to teach man to hunt another animal Give man a meal of friend fish; encourage him to join you on a fishing expedition; result: man leave dodos alone.2. Ask some of them to read their writing out.Step 6 Closing down by talking1. Suppose a situation: a friend gives you a very expensive, fine wool sweater. You are unhappy about the present but you do not want to upset your friend. What would you do?Some useful expressions: I am so sorry that….., I am afraid that……., thank you very much but….., it is shame that….., it was very nice of you but….., I hate to have to say this but….., the problem is…., why didn`t you tell me that…..?2. Let them discuss in pairs and then write a dialogue.Step 7 HomeworkFinish off the homework exercises.Read the listening text and try to tell something about the dodo.The sixth period: Using Language: Listening, Speaking and WritingThe emphasis of this period is laid on developing students` integrative skills to test if they have mastered what they have learned.Ability aims: develop students` listening, speaking and writing ability by finishing the relative tasks.Difficult points: how to develop students` writing and speaking abilities.Important points: develop the students` writing and speaking abilities.Step 1 RevisionCheck the homework exercises.Ask some students to talk about dinosaurs and the dodo.Step 2 Warming upSaying that: Many people, especially young ones, are concerned about the environment and wonder what they can do about it. Now we are going to listen to a story which is about looking after the environment.Step 3 Listening on page 62Turn to page 62, listen to the material after going through the exercises.Step 4 Listening taskTurn to page 66. play the tape for them to listen three times.Step 5 Speaking taskTurn to page 66 and read the directions, and then discuss the questions in pairs:1. What else threatens birds besides oil pills?2. How can we help protect the birds?3. How can we help people understand the importance of protecting the environment so that birds can live in peace?Step 6 Writing taskLet them write a short passage of about 120 words on how to design a place for watching birds.Step 7 Homework1. Finish off the homework exercises.2. Write your letters in your own exercise book.补充练习一. Choose the best answers.1. I don`t like the way_____ you talk to your mother.A. whichB. /C. in thatD. what2. With the water in the lake rising fast, villages around are _____.A. in dangerB. dangerC. dangerousD. in dangerous3. This atlas _____ 40 mans, _____ 3 of the Great Britain.A. contains; includingB. includes; containingC. contains; containingD. includes; including4. She suggested _____ the Western Hill this Sunday.A. we pay a visitB. to visitC. a visit toD. we visiting5. The exciting performances attracted the passers-by` _____.A. noticeB. attentionC. patienceD. taste6. The aging population in China will be a great _____ on the whole society.A. effectB. advantageC. difficultyD. problem7. The commercial center _____ in the middle of the 1980s.A. came outB. came into beingC. came overD. came from8. All the newspaper reporters hurried to the airport, ____ that the pop star didn`t turn up at all.A. disappointing to findB. disappointed findingC. disappointing findingD. disappointed to find9. The food ------ at the moment is for dinner party.A. cookedB. to be cookedC. is being cookedD. being cooked10. ----Why have you come to work on foot today?----Well, my bike _____ and I hate taking a crowded bus.A. has been repairedB. is repairingC. will be repairedD. in being repaired11. ---- Have you got your test result?----Not yet. The papers ____.A. are not correctingB. have not correctedC. are still being correctedD. is being repaired12. ----Excuse me, what time is it now?----Sorry, my watch _____. It _____ at the shop.A. isn`t working; is being repairedB. doesn`t work; is being repairedC. isn`t working; is repairedD. doesn`t work; is repaired13. ----Have you moved your new house?----Not yet. The rooms _____.A. are being paintedB. are paintingC. are paintedD. are being painting14. A new cinema ______ here. They hope to finish it next month.A. will be builtB. is builtC. has been builtD. is being built15. Rain-forests _____ and burned at such a speed that they will disappear from the earth in the near future.A. cutB. are cutC. are being cutD. had been cut16. The number of the rhino ____ in the last two years after the volunteers’ hard working.A. have increasedB. are increasingC. has increasedD. is increasing17.---Have the teacher returned our papers?---Not yet. I guess they ___ now.A.have gradedB. are gradedC. are being gradedD. are graded18.The restaurant where we used to have dinner ____, so we have to go to another one tonight. A. is rebuilt B. is being rebuilt C. has been rebuilt D. was rebuilt19.----Can you borrow me your bike? I want to go to the supermarket.----Sorry, but now it ____.A.is being repairedB. is repairedC. was repairedD. had been repaired20.----Have our new neighbor moved in?---No. The house ____ and they have to wait for another two days.A.is paintedB. paintC. is being paintedD. had been painted21.According to the officials in the United Nations, the product ____ at several places in India and it will be on sale in one month.A.is being testedB. is testedC. has been testedD. has tested22.Because of the bad weather, we ave no idea when the project _____.A.Has been completedB. Will be completedC. Was completedD. Is being completed23.The new plan ____ at the meeting. And we may have a final decision soon.A.has discussedB. is discussedC. has been discussedD. are being discussed24.The habitats of these Milu deer ___ and one day they may disappear from our sight.A.Was destroyedB. DestroyedC. Will be destroyedD. Are being destroyed25.---How about the murder case that happened last afternoon?---One of the two murderers has been caught and ____ in the police station now.A. is being questionedB. is questioningC. has questionedD. has been questioned二. Fill in the blanks with the words and expressions given below. Use each only once and make changes where necessary.come into being, species, protect …. From…, in danger of, wild, care for, peace, set up, increase, pay attention to, protect, in peace, die out, unsuccessful, think of, dig out, in peace, in danger of, in relief, burst into laughter, protect...from, pay attention to, come into being, according to, so that1. This species of plant will die out, unless we take actions to protect it.2. They were wild with joy when their team won.3. He hoped that his country would always be at peace with all other countries.4. The technical cooperation and cultural exchange between the two countries are daily on the increase.5. He was wearing dark glasses to protect his eyes from the sun.6. He was unsuccessful in his attempt to climb the Mt Everest.7. This kind of bird is dying out in the world.8. Leave him in peace; he is trying to work.9. Our teachers always pay attention to combining theory with practice.10. His father gave him some capital to set him up in business.11. I wonder whether they will care for us all to go there.12. How many factory workers are in danger of losing their jobs.13. They huddled together in the corner to protect themselves from the wind.14. Dinosaurs lived on the earth tens of millions of years ago, long before humans came into being.15. We have to think of his health before we recommend him for the job.16. From this documentary we can learn when and how the universe came into being.17. Knowing the operation of the poor girl’s leg was performed successfully, all the people smiled in relief.18. Don’t ask me any questions again, please. Just let me work in peace, will you?。
2024四年级上册英语分层卷听力2024 Grade 4 Upper Level English Listening TestPart 1: Listen and choose the correct answer.1. What time is it now?A. It’s eight o’clock.B. It’s nine o’clock.C. It’s ten o’clock.2. What did Sally do yesterday?A. She went to the park.B. She stayed at home.C. She visited her grandma.3. Where is my red hat?A. On the table.B. Under the bed.C. In the closet.4. How many apples do you want?A. Five.B. Three.C. Seven.5. What is the boy doing?A. Reading a book.B. Playing soccer.C. Riding a bike.Part 2: Listen and match the pictures with the correct words.1. Car2. Dog3. Sun4. Tree5. HousePart 3: Listen and fill in the blanks.1. My favorite color is ___________.2. I have ___________ brothers and ___________ sisters.3. I want to be a ___________ when I grow up.Part 4: Listen and answer the questions.1. What did you do last weekend?2. What are you going to do next summer?3. Do you like to watch movies? Why or why not? Part 5: Listen and follow the instructions.1. Stand up and touch your toes.2. Spin around three times.3. Clap your hands and jump.That concludes the listening test for Grade 4. Good luck!。
2022 年版《小学英语课程标准》倡导学思结合、用创为本的英语学习活动观,指出学生要“在体验中学习、在实践中运用、在迁移中创新”“围绕真实语境和真实问题,激活已知,参与到指向主题意义探究的学习理解、应用实践和迁移创新等一系列相互关联、循环递进的语言学习和运用活动中”。
学生的阅读兴趣、阅读习惯、阅读能力对核心素养的提升有着重要的影响。
因此,在本单元教学过程中要充分体现教材的育人价值,激发学生对阅读的热爱之情,培养学生自主阅读的习惯,通过引导学生基于对各语篇内容的学习和主题意义的探究,逐步建构和生成对于阅读的深层认知和正确态度,促进其核心素养综合表现的达成。
单元主题: School 该主题属于人与社会范畴;所属的主题群是生活与学习;涉及“乐学善思,勤于反思,学会学习”。
本单元围绕着“ School ” 这一主题展开,涉及三个语篇,包括三个对话,一个故事,三个听力。
语篇一是一个听力练习,主要的内容让学生感知学校场所的单词的表达。
语篇二是一段听力录音和对话,让学生学会运用单词和句型进行简单的交际。
语篇三是一个故事,学生能听懂、读懂小故事,能够进行简单的角色表演。
语篇四是一个听力练习,让学生能够学会介绍自己、朋友、老师本单元以“School ”为主题,紧紧围绕着“数字”开展学习和探讨活动,教材中的五个语篇形式各不相同,但内容相互关联,紧扣单元主题,构成了二个主题意义“学会学校场所的相关单词以及句型”、“学会在实际场景中运用句子”。
所以本单元主要是利用活动来进行,用活动来整合整个教学。
在本单元中有TPR 活动,有对话,有故事,主要的内容是让学生了解如何利用句型简单介绍自己的学校、在具体情景中对话来表达运用。
1.初步感知学校场所的单词和句型Part1 对话、听力(1 课时)2.初步感知介绍自己学校的简单句型表达Part2 听力、对话(1 课时)3.读懂故事,并进行角色扮演Part3故事(1 课时)4.通过学习能在老师的指导下利用句型进行简单的交际Part4听力、对话练习(1 课时)初步感知学校场所的单词和句型Lesson1听力、对话能正确读出,规范书写单词----gym, library,playground, canteen,computer room,classroom, grasp themeaning of the words.能在老师指导下运用Are there…?/Isyour…big(small)?等句型进行简单交际。
PET口语题库-PART3+4一、口语Part 3看图讨论口语Part 3的关键词是discuss(讨论),由两名考生互相交谈。
考官会提供一张包含多张图片的情景任务图卡,并要求考生讨论与图片有关的活动、事物或地点,通过提议和协商达成一致意见(make recommendations and negotiate agreement)。
两名考生应该讨论不同的活动、事物或地点,分享各自的想法,提出建议并说明理由,还可以讨论其他可行的方案(make suggestions and give your reasons,discuss alternatives)。
此部分考生需要互相提问和回答(make and respond to suggestions)。
(一)对话如何展开?在Part 3考试中,考官会为考生描述一个情景,并给出一张包含多张图片的图卡,要求考生根据所给的图片选项进行讨论。
本部分主要考查考生在讨论不同的选项、表达观点和做出选择时,使用功能性语言提出建议并对建议做出反馈的能力。
要求对话时长为2~3分钟。
1.答题要点(1)考生应该集中精力全面参与任务,讨论所有图片选项,而不是急于得出结论。
(2)考生应该就对方的想法做出回应,并通过给出自己的看法或提出问题等方式来推进讨论。
2.五步展开对话(1)建议从某一个选项开始讨论,一般可先选择你认为最容易描述的图片;(2)表达自己的看法并简要说明原因;(3)询问对方的看法;(4)待对方说完后,再建议继续讨论下一个选项;(5)直到所有选项都讨论完后,做出最终选择。
3.注意事项(1)如果没有时间讨论完全部图片也不要紧,这不会影响最终得分;(2)眼睛要看着搭档,表示对他/她说的内容感兴趣;(3)仔细聆听并积极回应对方,同时要注意表情及身体语言得当;(4)注意交流的基本礼仪,比如不要随意打断对方;(5)避免说得太多,要适当地给对方表达观点的机会,否则会影响“互动沟通”方面的得分。
人教版新目标8年级上册第一次月考复习Part1 短语必备1.study for为…而学习2.be on vacation在度假3.quite a few相当多,不少4.most of the time大部分时间5.keep a diary写日记6. the next day第二天7. in the past 在过去8.walk around 四处走走9 too many(+可数名词复数)太多10.because of +名词/短语因为11. find out找出/查明12. something important 重要的事情13.make a decision 做决定14.free time业余时间15.once a week 一周一次16.twice a week 一周两次17.three times a week 一周三次18.go to the movies 去看电影19.hardly ever 几乎不20.on weekends 在周末21.stay up late 熬夜22.in one’s free time 在某人的业余时间23.four to six times a week 一周46次24.not… at all 根本不25.go online 上网26. make up one’s mind 下决心27.be full of = be filled with 充满…28.at least至少29.more than 超过/多于30. less than 少于31.keep healthy 保持健康32.be good for 对…有好处33.be good at 擅长…34.be good with 和…相处的好35.be good to 对… 友好36. as...as...与……一样37. be talented in….在…方面有天赋38. the same as与……相同39. care about 关心40. care for = take care of = look after 照顾41. be different from 与…不同42. as long as 只要43. bring out使显现,使表现出44.one… the other 一个…另一个,45. be similar to 和…相似Part2 句型梳理1.feel like +从句感觉像…2.feel like +ving 想要3. buy sth. for sb./ buy sb. sth. 为某人买某物4. n othing ….but + v.(原形) 除了…之外什么都没有5. seem + (to be) +adj看起来…6.seem to do sth. 似乎,好像做某事。
英语作文四个partPart 1: Introduction to the TopicThe English language is a global phenomenon, connecting people from diverse backgrounds and cultures. It is a bridge that spans continents, facilitating communication and understanding.Part 2: Importance of EnglishEnglish is not just a language; it is a tool for empowerment. It opens doors to international opportunities, be it in education, business, or travel. Mastery of English can enhance one's career prospects and personal growth.Part 3: Challenges in Learning EnglishLearning English, however, is not without its challenges. It requires dedication and persistence. For non-native speakers, the nuances of grammar and pronunciation can be daunting. Yet, with the right approach and resources, these hurdles can be overcome.Part 4: Strategies for Effective LearningTo excel in English, one must embrace a variety of learning strategies. Engaging in conversations, reading extensively, and practicing writing are essential. Technologyalso plays a crucial role, offering platforms for interactive learning and instant feedback.Part 5: Benefits of BilingualismBeing bilingual in English and one's native language is a double-edged sword. It enriches one's cognitive abilities and cultural understanding while sometimes presenting challenges in maintaining fluency in both languages.Part 6: The Future of EnglishAs the world becomes more interconnected, the role of English is only set to grow. It will continue to evolve, incorporating elements from other languages and cultures, reflecting the dynamic nature of global communication.Part 7: ConclusionIn conclusion, English is more than a language; it is a passport to a world of opportunities. With the right mindset and effort, anyone can learn to speak, write, and understand English, enriching their lives and broadening their horizons.。
Part 1 Understanding Short Conversations(每小题:1 分)Directions: In this section you'll hear some short conversations. Listen carefully and choose the best answer to the questions you hear.1.A. The woman is a talented singer and impressed the man.B. The man would like to go to a talent show.C. The man liked the show better than the woman.D. The woman had no interest in the show at all.2.A. He feels he isn't good enough.B. He feels he isn't a kid anymore.C. He can't make it on the 12th.D. He doesn't like trying.3.A. One's own values.B. One's hard work.C. One's personal contacts.D. One's special abilities.4.A. The man is a professional actor.B. The man never thinks about acting.C. Many people don't like acting.D. Many people think the man's a good actor.5.A. The man doesn't think second place is good.B. The man hasn't taught the woman anything.C. The woman is proud of winning the race.D. The woman believes she is a loser.6.A. They have rights.B. They are well-paid.C. They work outside homes.D. They have good jobs.7.A. Mother and son.B. Father and daughter.C. Husband and wife.D. Boss and employee.8.A. The 12th.B. The 17th.C. The 15th.D. The 18th.(Hidden)Click ONCE on the speaker icon to start listening!放音结束前请不要离开本页。
Suggested Solutions for GCE QuestionsPart 4 Bonding and Structure (Book 1, p.330 – p.334)36. (a) (i) Graphite Structure: Giant molecular layer structure with hexagonal arrays of carbon atomsarranged in layers.Within each layer, each carbon atom forms 3 covalent bonds with 3 other carbonatoms. Weak Van der Waal’s forces hold the layers together. Hence graphite is soft and slippery as the weak attractions between the layers allow one layer of bonded atoms to slide over another.The non-bonding electrons of the carbon atoms in each layer are delocalised andfree to move ⇒ graphite is an electrical conductor.(ii) Iodine Structure: Simple molecular crystal lattice with I 2 molecules held in lattice sites byweak Van der Waal’s forces (temporary dipole – induced dipole forces).I 2 sublimes easily, as little energy is sufficient to separate the molecules. I 2 is a non-conductor of electricity as no mobile electrons or ions are present.(b)+107 + 496 + 79 + (–328) + ∆H LE = –574 ∆H LE = –928 kJ/mol (c) L.E ∝radiusanion radius cation anion of charge cation of charge +⨯NaF and KCl have same cation charge and anion charge but radius of Na + < radius of K + and radius of F – < Cl –. ∴ LE(NaF) > LE (KCl)37. (a) Bond energy —It is the energy required to break 1 mole of bonds in gaseous molecules to form gaseous atoms under standard conditions. e.g.CH 4(g) ∆H− → − C(g) + 4H(g)Bond energy (C —H) =14⨯ ∆H.Suggested Solutions for GCE Questions(b)H and P have similar electronegativities, P—H bond is purely covalent.⇒ P—H covalent bond length = covalent radius of P + covalent radius of H= 12(P—P) bond length + 12(H—H) bond length.Since bond energy depends on bond length (inversely),bond energy (P—H) = 12BE (P—P) + 12BE (H—H)i.e. BE (P—H) = 12(BE of P—P + BE of H—H)Cl is more electronegative than H. H—Cl has covalent and ionic character (It is stronger than a pure covalent bond because of the stronger attraction between the 2 atomic nuclei).⇒ H—Cl bond length < 12 (H—H) bond length + 12(Cl—Cl) bond length∴ BE (H—Cl) > 12[BE (H—H) + BE (Cl—Cl)](c)Large amount of energy is required to break triple bonds (N≡N) in N2 molecules forreaction to occur.⇒ High activation energy38.(b) F2O: 2 bp, 2 lpV-shaped or bentH3O+: 3 bp, 1 lpShape: Triangular pyramidClF4–: 4 bp, 2 lpShape: Square planarSuggested Solutions for GCE Questions(c)Square based pyramid ⇒ 5 bp + 1 1p⇒ Total 12 e around SbSb has 5 e (gp V), 5 e from 5F⇒ n = 2 ⇒ we have SbF52–∴ O.N of Sb = +339.Ne and Ar —simple ‘molecular structure’ with atoms attracted together by very weakinstantaneous dipole-induced dipole forces. Hence both Ne and Ar have very low mps.Strength of intermolecular forces increases with no. of electrons.Ar is a bigger atom and has more e than Ne.⇒ Ar has a higher mp than Ne.H2O — polar molecule. Strong H-bonding exists between H2O molecules.Ice, simple molecular structure with each H2O moleculeH-bonded to 4 other H2O molecules to give an open network structure.⇒ Ice or H2O(s) has a low mp compared with ionic solids or giant covalent compounds.However, because of strong H-bonding, its mp is higher than other simple molecular substances with similar Mr.NaF — giant ionic structure, Na+ and F– held in lattice sites by very strong ionic bonds.Large amount of energy is required to separate ions for melting to occur ⇒ very high mp.Diamond — giant covalent structure with C atoms covalently bonded to each other. Each Catom is strongly bonded to 4 other C atoms to give a giant network of C atoms. Therefore,infinite no. of strong covalent bonds are to be broken in melting ⇒ very high mp.40. (a)F2(g) → 2F(g)Bonded energy of F—F is the energy required to break 1 mole of F—F bonds in gaseousF2 molecules to form free gaseous F atoms under standard conditions.SF4(g) + F2(g) → SF6(g) ∆H = –434 kJ/molEnergy required for bond breaking in reactants = 4 ⨯ BE (S—F) + BE (F—F)= 4 ⨯ BE (S—F) + 158Energy evolved in bond formation in products = 6 ⨯ BE (S—F)∴∆H = –434 = [4 ⨯ BE (S—F) + 158] – [6 ⨯ BE (S—F)]BE (S—F) = + 296 kJ/molAssumption: same BE (S—F) in SF4 and SF6(b) (i) SF2V-shapeSF6Suggested Solutions for GCE QuestionsOctahedral(ii)41. (a) (i) A: CH4, non-polar moleculeDiscrete molecules held together by weak instantaneous dipole — induced dipoles⇒ very low bp.D: SiH4 similar to AWeak intermolecular force (instantaneous dipole — induced dipoles) ⇒ very lowbp.Since SiH4 has more electrons than CH4, the strength of intermolecular forces isstronger. ∴ bp of it is higher than CH4.B: NH3— polar molecule with highly electronegative atom N. Strong H-bondingbetween NH3 molecules ⇒ bp is higher than A and D.C: H2O — polar molecule has highly electronegative atom O. H-bonding betweenH2O molecules is stronger than NH3 because O is more electronegative than N.Hence bp of H2O is higher than NH3.(ii)bp of H2O > bp of HF > bp of NH3(forms more H (F morebonds than HF) electronegative than N)bp of GeH4 > bp of SiH4GeH4 has more electrons.∴stronger Van der Waal’s forces.Suggested Solutions for GCE Questions(b) (i)(ii) H-bonds42.NaCl — giant ionic structure with very strong ionic bonds holding Na+ and Cl– ions in lattice. Alarge amount of energy is required to separate ions to melt the solid ⇒ very high mp.AlCl3, CCl4, SiCl4— all non-polar covalent molecules with simple molecular lattices. Discrete molecules are attracted by weak Van der Waal’s force (instantaneous dipole-induced dipoles).Their mps are generally much lower than that of ionic solids like NaCl.However AlCl3 forms dimer Al2Cl6 with a large electron cloud with many electrons ⇒ fairly strong van der Waal’s forces∴ mp is much higher than CCl4 and SiCl4SiCl4 though having more electrons than CCl4, it tends to sublime partially and therefore has a lower mp than CCl4.43. (a) (i) A: Enthalpy change of atomisation of sodiumB: First ionisation energy of sodiumC: Enthalpy change of neutralisation(ii) D: Enthalpy change of hydration of gaseous sodium ion and electron affinity of H+(aq).(b) (i) B: ∆H = +494 kJ/mol(ii) –58 – 494 – 107 + ∆H E= –850∆H E= –191 kJ/molSuggested Solutions for GCE Questions44. (a) (i)Gaseous Cl2Covalent Cl—Cl bondInstantaneous dipole — induced dipole forces between Cl2 molecules.(ii) Liquid H2OCovalent O—H bonds in H2OHydrogen bonds between H2O molecules.(iii)Solid NH4ClIonic bonds between NH4+ and Cl– ionsCovalent bonds N—H within NH4+ ion.(b)Gaseous Cl2 molecules move at high speeds in random directions. They are very far apartfrom each other with very weak Van der Waal’s force between them.Average K.E of molecules is decreased and more interaction between molecules areresulted from cooling effect. Interm olecular attractions increases until molecules ‘sticktogether’ to form aggregates and the gas liquefies.(c)(i) a = +150 kJ/mol, b = +2186 kJ/mol, c = +242 kJ/mold = ?e = –2493 kJ/molf = –642 kJ/mol(ii)a + b + c + d + e = fd= f– (a + b + c + e)(iii)d = –642 – (150 +2186 + 242 – 2493)= –727 kJdElectron affinity of Cl = 12= –363.5 kJ/molSuggested Solutions for GCE Questions(d) (i)Electron affinities of halogens F to I become less exothermic since the atomic sizeincreases from F to I. That is, less energy is released when an electron is added to abigger halogen atom. It is because smaller attraction exists between the nucleusand electron due to a bigger atomic radius.However, electron affinity of F is smaller than Cl.(ii)Due to the very small size of F atom, an additional electron will experience a greater repulsion from the outermost shell electrons (which are crowded together),rather than the attraction from the nucleus.45. (a)12Br2(g) + 32F2(g) –79− →− BrF3(g)Energy absorbed to break bonds in reactants = 12 (112 ⨯ 2) + 32(79.1 ⨯ 2)= 349.3 kJEnergy evolved in forming 3 Br—F bonds = 3 ⨯ BE (Br—F)349.3 – 3 ⨯ BE (Br—F) = ∆H = –79BE (Br—F) = 142.8 kJ/mol(b)Cl—F bond shorter than Br—F bond since Cl radius < Br radius⇒ Cl—F bond enthalpy > Br—F bond enthalpy46.Refer to the text.47. (a) (i) CaCl2Ionic bonds between Ca2+ and Cl– ions(ii) CH4Covalent bonds between C and H atoms.(iii) Na(s)Metallic bonding — valence electrons of Na atoms form a delocalised electroncloud. Electrostatic attraction between negatively charged electron cloud andlayers of positively charged sodium ions forms metallic bonding.(b) (i) Refer to p.220.(ii)Face-centred cubic structure(iii)CN(Na+) = 6CN(Cl–) = 6Suggested Solutions for GCE Questions(c) Incorrect statementBoiling of CCl4 requires separation of CCl4 molecules and hence breaking intermolecularattractions between CCl4, i.e. instantaneous dipole — induced dipole forces, which areweak. Hence ionic bonds are stronger than van der Waal’s forces, but not covalent bonds.(d)Lone pair of electrons on N in NH3 is donated to H+ to form a dative bond.(e)Alkali metals form giant metallic lattices with weak metallic bonding. All have body-centred cubic crystal structures.The other metals have stronger metallic bonding and they can have different crystalstructures.48.PF3: 3 bp, 1 lpShape: pyramidCS2: ‘2 bp’ 0 lpShape: linearXeF4: 4 bp, 2 lpShape: square planarPBr4–: 4 bp, 1 lpShape: seesawSuggested Solutions for GCE Questions49. (a) (i)Dative covalent bondA covalent bond is formed by sharing of electrons between 2 atoms, one of whichhas a lone pair of electrons, which is donated.e.g.(ii) Ionic bondAn electrostatic attraction exists between oppositely charged ions, which areformed by electron lost by a metal atom and electron gained by a non-metal.e.g.Na → Na+ + e–Cl + e–→ Cl–NaCl(b) (i)Phase change from solid state to vapour state without passing through the liquidstate.(ii)AlCl3, a covalent substance hydrolyses in water:AlCl3 + 3H2O → Al(OH)3 + 3HClorAlCl3(s) + 6H2O(l) → [Al(H2O)6]3+(aq) + 3Cl–(aq)The process (hydration of ions) is exothermic, releasing energy to overcome H-bonds between H2O molecules ⇒ AlCl3 dissolves readily in water.I2— non-polar molecule forms weak dipole-induced dipole attractions with water.These weak forces are unable to replace the strong H-bonds between H2Omolecules ⇒ I2 is insoluble in H2O.(iii)Invert a filter funnel over an evaporating dish containingmixture of NaCl and I2. Heat the mixture. I2 sublimatesanand condenses on cool filter funnel above. NaCl(s) remains indish.Suggested Solutions for GCE Questions(iv) At 200°C, aluminium chloride exists as a dimer Al2Cl6.Covalent and dative covalent bonds50. (a)(i)Trigonal pyramidal(ii)BE (P—P) in P4(s) = 14(1 272.4) kJ/mol = +318.1 kJ/mol(iii)14P4(s) + 32Cl2(g) –303− →− − PCl3(g)Energy absorbed in bond breaking in reactants= +318.1 + 32(242) = 681.1 kJ681.1 – 3 ⨯ BE (P—Cl) = –303BE (P—Cl) in PCl3= 328.0 kJ/mol(iv)PCl3(g) + Cl2(g) –93− →− PCl5(g)Assuming the 3 P—Cl bonds in PCl3 remain intact in PCl5,B E (Cl—Cl) – 2 ⨯ BE (P—Cl) = –932 ⨯ BE (P—Cl) = 242 + 93BE (P—Cl) in PCl5= 167.5 kJ/molNew Way Chemistry for Hong Kong A-levelSuggested Solutions for GCE Questions24232613.doc Manhattan Press (H.K.) Ltd. 27 (b) (i) The 2 axial P —Cl bonds are longer than the 3 equatorial P —Cl bonds ⇒ axial P —Cl bonds have smaller bond energies than equatorial P —Cl bonds.(ii) Average bond energy = 15[(3 ⨯ 328) + (2 ⨯ 167.5)]= 2 63.8 kJ/mol(iii) N, a period 2 element, does not have vacant low-lying d -orbitals in its valenceshell. Hence N cannot accommodate more than 8 electrons. To form NCl 5, 10e hasto occupy its valence shell ⇒ NCl 5 does not form but only NCl 3.P, period 3 element, has vacant 3d orbitals. Hence P forms PCl 5 as well as PCl 3.51.(a) K +(g) + Br –(g) → KBr(s)Enthalpy change: Lattice energy of KBr(b)L.E + 90 + 424 + 112 + (–348) = –392L.E (KBr) = –670 kJ/mol(c) Acidic white fume of HBr followed by reddish brown fumes of Br 2 vapour will be observed.Conc. H 2SO 4 displaces HBr and further oxidises it to Br 2.(d) Acidify solution with dil. HNO 3, and then add aq. AgNO 3.If a cream colored ppt which is insoluble in aq. NH 3 is formed ⇒ Br – exists.。