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Unit 4 Global Warming教材分析Ⅰ.教学内容分析本单元的中心话题是人类当今面对的环境问题，主要探讨了“全球变暖”和“节约能源”等方面的问题。
由于人类过多使用不可再生能源，大气中二氧化碳的含量逐年增加，导致全球气温上升。
通过学习本单元，让学生了解能源分为“不可再生能源”和“可再生能源”，帮助学生树立“节约能源、保护环境”的主人翁意识。
语言知识和语言技能主要围绕“全球变暖”和“节约能源”这一主题设计的。
“热身”(Warming up) 部分要求学生列举家中、学校或其他地方使用能源的物体，指出这些能源的来源，并尽可能多地列举不同的能源。
能源可分为两类：一类是可再利用能源；另一类是一次性能源。
把前面列举的能源按能否再利用这一标准进行分类。
本部分提供了六幅图片，教师可以从识图开始组织教学。
还可以让学生搜集一些其他相关图片。
这六幅图分别为：风力（wind power）、燃煤发电站（a coal power station）、炼油厂（an oil refinery）、原子能发电站（a nuclear power plant）、太阳能接受器（solar panels）、水坝（a hydro dam）。
“读前”(Pre-reading) 部分首先介绍什么是温室、它有什么作用，然后要求学生讨论大气中温室气体的作用。
温室是由玻璃构成的建筑，主要用于花果蔬菜的培植。
温室是由玻璃构成的建筑，主要用于花果蔬菜的培植。
温室能阻止热量散发，因而能帮助植物度过寒冷的时期。
该部分的讨论有利于学生预测课文内容和理解阅读课文中的温室气体效应。
“阅读”(Reading) 部分是一篇杂志文章，主要讲述了地球温度上升的现象和原因。
20世纪中，地球的温度上升了华氏1度。
这看上去是一个很小的数字，但相对于自然界的其他现象来说，这个增长速度是迅猛的。
这种现象是自然发生的还是人为的？这个问题引起激烈的争论。
许多科学家认为，这种变化是人类燃烧矿物燃料所致。
英语牛津译林版选修6 Unit 4同步学案（1）（Welcome02）限时训练（含详细解析）一、课文理解（10分钟）choose the best answers to the following questions:1. What occupation does Tang Ning take up in the UN?A. The Secretary-General.B. A Goodwill Ambassador.C. The spoken man.D. A clerk.2. How much money does she earn by doing the job?A. She earns a lot.B. She volunteers. She gets no salary for the job.C. She earns some, though not much.D. It isn’t mentioned in the article.3. What project or projects has she been involved in?A. She helps develop the world’s education.B. She helps deal with such problems as poverty and disasters.C. She visits countries where the UN has programmes to help people.D. She visits the poorest areas in the world.Answers 1. B 2. B 3. C二、根据课文内容填空：（10分钟）I feel very honored to have been able to work as a Goodwill ___1___of the United Nations. First, I should tell you something about the UN. The UN was set up just after the Second World War in October 1945. It has four main___2___: to keep international peace; to develop friendly ____3____among nations; to co-operate in solving international problems and in ___4____ respect for human rights; and to be a center for ____5___the actions or work of different nations. As you know, the UN touches the lives of people everywhere. For example, where there is a war, there you will see soldiers wearing blue___6___. In addition, the UN helps protect human rights and works to improve international laws. Second, I want to tell you about the work I have been doing. I mainly visit countries where the UN has___7___ to help people. The television and press will follow and record my visits, which will increase people’s___8____of the work of the UN. Apart from the urgent problems caused by wars and___9____, the UN helps countries with other problems such as lack of education, lack of food, ___10_____, disasters and disease. So with the work of the UN the world has been brought closer together.Answers:. 1. Ambassador 2. purposes 3. relationships 4. promoting 5. organizing 6. berets7. programmes 8. awareness 9. conflicts 10. poverty三、单词拼写（5分钟）1. The victims were not r_____ by name.2. Troops are o_____ from bases in the north.3. Would you do me the h_____ of dining with me ?4. The smile on her face made it all w_____.5. She felt she had looked at the problem from every r_____.6. The house is_____ (偏僻) from any other building.7. His main_____ (消遣) seems to be shopping.8. These new shoes are very _____（舒服的）9. It’s very easy to get_____ (居丧的)in this job.10. The methods of communication used during the war were ______ (原始的)by today’s standards. Answers 1.referred to 2. operated 3.honor 4.worthwhile 5.respect6. remote7. occupationfortable9.frustrated 10.primitive四、单项选择（8分钟）1. Though ______ money, his poor parents managed to send their only son to university.A. lackedB. lacking ofC. lackingD. lacked in2. _______ my family I would like to thank you for our help.A. On behalf ofB. In behalf ofC. On behalf inD. With the behalf of3. When you come across a new word, you can _________ the dictionary. Which is NOT true?A. look upB. refer toC. turn toD. look it up in4. Only one of these books is _________.A. worth to readB. worth being readC. worthy of being readD. worthy read5. _______ the house in London, they also have a villa in Spain.A. Except forB. ExceptC. Apart fromD. In addition6. The group of eight _________eight richest countries in the world is really powerful.A. is made ofB. made up ofC. consists ofD. consisted of7. —I didn’t see Lao Wang at the meeting yesterday. What’s wrong with him?—He _________ heart disease.A. is sufferingB. is suffering fromC. suffersD. suffers from8. He _________ his objections to the plan _________at the meeting.A. set about; discussingB. set out; discussingC. set out; discussedD. set about; discussed9. There are many such organizations under ___________ of the government ___________ are__________ of the poor people across the world.A. the umbrella; as; for the purposeB. the charge; that; for the purposeC. the charge; as; to the purposeD. the umbrella; that; to the purpose10. Fortunately, I had __________ the leading role in the movie.A. a chance to take onB. a chance for taking onC. an opportunity to take asD. an opportunity for taking as11. My former boss ________ us ________ a new company.A. helped; in setting upB. assisted; in setting upC. assisted; into setting upD. helped; into setting up12. The doctor that will _________ him is attempting to _________ the facilities for operation.A. operate on; operate onB. operate; operateC. operate on; operateD. operate; operate on13. Is the girl _________ the one that was _________ at the meeting yesterday?A. passing by; referred toB. passed by; referred toC. passing by; referring toD. passed by; referring to14. Though the only _________ the village is by boat, the village is _________everyone.A. access of; accessible forB. accessible for; access toC. accessible to; access toD. access to; accessible to15. _________ the painter _________ a horse within 5 minutes _________ people’s attention.A. /; drew; drewB. That; drew; drawingC. /; drawing; drewD. That; drew; drewAnswers: 1-5 CAACC 6-10 BBCAA 11-15 BCADD［解析］1. C lack用作及物动词；此处是“Though they lacked money”的省略，表达主动意义用现在分词。
Unit 4 Global warming学情分析：教材分析本单元以Global warming 为主线，旨在通过单元教学使学生经过思考、学习，认识到全球变暖的起因和它所带来的种种后果。
同时鼓励学生进一步阐述地球所面临的其它严重问题，激发学生的环保意识。
引导学生运用所学语言、句式表达自己对这些现象的看法，培养他们为自己的观点辩论的能力，并能运用所学知识写一篇有关环境问题的论文。
类别课程标准要求掌握的项目话题Global warming, pollution and the importance of protecting the earth功能句式Expressing agreement, disagreement, blame and complaint Yes, I agree with you./ Yes, I think so./ I believe that you’ve got it right.I don’t think so./ I don’t think that’s right./ I’m afraid you are wrong. I’m sorry to bring this up, but ... / I’m sorry to have to say this, but ... They shouldn’t have done it./ They are to blame./Why don’t you do something about it?/ Perhaps they should/ ought to do ...词汇本单元无写作词汇。
阅读词汇：consume, graph, random, phenomenon, subscribe, fuel, quantity, tend, per, data, catastrophe, flood, oppose, mild, consequence, state, range, glance, widespread, steady, steadily, tendency, average, existence, outer, advercate, commitment, pollution, growth, electrical, casual, motor, can, circumastance, microwave, refresh, educator, contribution, presentation, nuclear, disagreement词组come about, subscribe to, quantities of, go up, result in, even if, be opposed to…, keep on, on the whole, on behalf of , put up with, so long as, and so on语“It” used for emphasis法It is human activity that has caused this global warming.教案一Warming Up, Pre-reading and ComprehendingTeaching goals1.Enable the students to talk about different sources of energy and express their own ideas about the use of energy.2. Enable the students to talk about the causes and effects of global warming.Step1.Warming upT: As we all know, we depend on energy to do many things in our daily life. Some people even say we could do nothing without energy. Do you aggree with me ?Then where does all the energy come from? Open your books and turn to page 25. Look at the pictures on this page. They may help you find out the answers.Sample answers:Renewable Non-renewableWind power CoalSolar power Natural gas and oilHydroelectric power Nuclear powerStep 2. Pre-readingLook at the picture of greenhouse on page25.What is it in the picture?☆Discuss the pre-reading part 1and 2.(Greenhouse gases: In the atmosphere surrounding the earth there are gases, which are called “greenhouse gases”, including carbon dioxide, methane and water vapor.)☆Then what do you think greenhouse gases do?(They trap heat from the sun and therefore warm the earth.)☆One of the effects is more and more carbon dioxide is being produced, which in turn increases the speed of global warming. Does it matter? What’re your opinions? Next we’ll read an article “THE EARTH IS BECOMING WARMER — BUT DOES IT MATTER?”Step3. Comprehending☆Look at the title can you guess the main topic of the article(Global warming/ the warming of the earth)Skimming:☆ Read the passage quicklyHow many paragraphs does the reading text consist of? Please number them.According to the main idea of each part, match them in a right order.Part1 (1) Two different attitudes among scientists towards global warming.Part2 (2-5) How global warming comes about.Part3 (6) Introduce a discussion about global warming.Part4 (7) Leave us a question whether people should do something about global warming or not. ☆Can you match the logic order with each part? (Keys: BADC)A. Giving examples,using graphs, explanationB. Raising a questionC. Leaving a questionD Giving examples, making contrast☆Scanning: Finish the exercises 1(1,2) and 2(True or false)教案二Language points1. So how has this come about and does it matter?Can you tell me how the accident came about?With the use of electricity, great changes have come about.总结：come about发生, 造成, 相当于happen/take place/ occur to是不及物短语。
高二选修6学案Unit 4 Global warming杨雪琪一、译文欣赏第四单元全球在变暖全球在变暖一一这会带来什么影响吗?在20世纪期间,地球温度大约升了华氏1度。
这个数值对你我来说很可能是无所谓的,但是跟其他自然变化相比较而言,这却是一种快速的增长。
那么,这种温度的增长是怎么产生的呢?会产生什么影响呢? “关爱地球”组织的索菲·阿姆斯特朗就在探究这些问题。
毫无疑问,地球是在变暖(见表一,略) ,而地球变暖正是人类活动导致而成的,并非是一种无规律的自然现象。
所有的科学家赞同这种观点:人们为了生产能量而燃烧化石燃料(如煤、天然气和石油等) ,从而引起了地球温度的升高。
这个升温过程的一些副产品就叫做"温室"气体,其中最重要的就是二氧化碳。
贾尼丝·福斯特博士解释说:“有一种科学家称之为…温室效应'的自然现象。
这种现象发生在大气层中少量的气体(如二氧化碳、甲皖、水蒸汽等)吸收太阳的热量,因而使地球变暖的时候。
如果没有这种…温室效应',地球的温度将比现在的温度还要低33摄氏度左右。
因此,我们需要这些气体。
当我们在大气层中增加了大量额外的二氧化碳时,问题就来了。
这意味着更多的热量被困在大气层中,从而引起全球温度上升。
"我们知道,在过去100-150年期间,二氧化碳的含量急剧增加了。
有一位名叫查尔斯·基林的科学家曾经把1957-1997年期间大气层中二氧化碳的含量作了精确的统计。
他发现,在这些年里,大气层中的二氧化碳含量从315/1000 000上升到370/1000 0000 (见表二,略)所有科学家都接受这个数据。
他们还赞同下述观点,正是由于越来越多燃烧化石燃料导致了二氧化碳的增加。
那么气温会升到多高?福斯特博士说,在今后的100年里,全球变暖的量可能低到1-1.5摄氏度, 但是也有可能高达5摄氏度。
然而,科学家们在对待升温的态度上却是大不相同的。
英语译林牛津版选修6Unit4同步复习学案（1）Module 6 Unit 4 Understand each other一．词汇复习篇：【单词】1. I am pleased to have this chance today to talk to you about the United Nations of the UN, as it is more often referred to.refer to… 提到；说到；涉及到；向…查询信息；与…有关, 关系到…；When I said someone was stupid, I wasn’t referring to you. 我说有的人很蠢并不是指你。
We often refer to New York as Big Apple.我们常把纽约称为大苹果。
I referred to my watch for the exact time. 我看了一下手表好知道准确的时间。
What I have to say refers to all of you. 我要说的事和你们大家都有关。
▲refer A to B 把A送交B (以谋求帮助指点等)My doctor referred me to a hospital specialist. 我的医生把我交给医院专科医生治疗。
2. Being a Goodwill Ambassador means that I visit countries where the UN operates programs to help you.operate vi./vt. operation n. 运转；操作；手术operator n. 操作者；经营This machine operates night and day. 这台机器日夜运转。
This system operates in five countries. 有五个国家实施这种制度。
Unit4 Global warming一、学生分析本堂课所教学生为高二文科班的学生，积极和活跃是他们在课堂学习实践活动中的特点。
大部分学生经过初中和高一阶段对英语这门语言的学习和掌握，已经为高二阶段的英语学习打下了较好的基础。
表现为：大部分学生能够做到课前预习和准备，课堂上能伴随课程的思路，积极主动的参与课堂活动，如小组讨论，问答练习等；并且部分学生都具有一定的自我约束能力和独立思考的能力，如对某一问题进行讨论时除了能够完成对问题的回答，还能够提出反问甚至是自己独特的见解等。
但是仍有一小部分学生由于种种原因造成了英语基础薄弱，上课不够积极主动，学习任务完成不充分等问题。
对此，在课堂活动中要进行有针对性的帮助。
如进行分组讨论时，可让他们与学习基础好的同学一组且要给予更多的鼓励，使他们尽早能提高对学习英语的兴趣。
本堂课之前学生们已经完成了对Model 6 Unit3 A healthy life 的学习任务，对健康生活的真正涵义也有了一定的理解。
因而在本堂课的引入环节中就结合这个内容进行了设问。
如“健康生活需不需要保护环境呢？”等。
且学生在这一单元以及之前所掌握的英语语言知识技能如：环境和健康的关系；如何开展讨论；如何发表自己的观点等都可以运用到本节课中。
二、本节课教材分析与教材整合1. 单元教材分析本单元以Global warming 为主题，学生通过单元教学经过思考、学习，讨论从而认识到全球变暖的真正涵义和它所带来的种种后果。
同时学生能够进一步认识我们的地球所面临的其它严重问题，激发学生的环保意识。
引导学生运用所学语言知识、句式表达自己对这些现象的看法，培养他们为自己的观点辩论的能力。
Warming Up通过真实的图片再现，使学生对能源的用途和种类有一个基本的了解。
从而为本单元主题Global warming 作了很好的铺垫。
Pre-reading部分组织学生对这些问题的讨论、回答，也让学生有进一步思考的空间，为下一步阅读做好准备。
Book6 Unit4 Global warming 导学案（Period One: Reading）课前案Skim the text and finish the following information.1.What’s the main topic of the passage?The main topic of the passage is about .2.Who wrote the magazine article? What is the name of the magazine?wrote the magazine article; the name of the magazine is .3.What are the names of the three scientists mentioned in the article?The names of the three scientists mentioned in the article are , , and .Do they agree with one another? .4.The passage can be divided into three sections, match them with the main idea of each section.Part1.(1) A. How global warming comes aboutPart2. (2-5) B. List two different attitudes towards global warmingPart3. (6) C. Introduction of global warmingPart4. (7) D. Whether people should do something about global warming课中案学习目标:1.To learn some important words and phrases about global warming.2.To develop the reading skills by skimming and scanning the passage.3.To strengthen the awareness of environment protection .Step 1 Fast readingRead the text quickly and choose the best answers.1. How much did the temperature rise in the 1900s?A．One degree Fahrenheit. B．One Celsius.C．Two degrees. D．Thirty degrees Celsius.2.What causes the earth’s temperature increasing?A. Cutting treesB. Wasting the farmland.C. Running out of the river waterD. Burning fossil fuels.3.Which of the following is Dr. Janice F oster’s opinion?A. The result of the temperature increase will be serious.B. The amount of warming is nothing serious.C. We needn’t worry about high levels of carbon dioxide.D. Global warming is a natural phenomenon.4.According to George Hambley, .A. Global warming is a serious problem.B. There is no need to worry about global warming.C. The levels of CO2 in the air will become lower in the future.D. More animals will make greenhouse gases decrease.5. We can infer from the text that __________.A. the debate about the effects of global warming has not been settled.B. the greenhouse effect is the result of people’s actions.C. all scientists think it is important to reduce the amount of CO2 in the atmosphere.D. reducing greenhouse gases will immediately decrease the earth’s temperature. Step2 Careful reading Read Para.2 to Para.6 and fill in the blanks.(Para.2-Para.3)The reasons for global warminggreenhouse gases(Para.4-Para.5)The levels of carbon dioxide have increased greatly over the last . According to Dr.Charles Keeling, from to , the amount in the atmosphere wentup from around parts to around parts per millionDr.Janice Foster believes over the next century ,the amount of warming could be as lowas degrees Celsius, but it could also be as high as degrees.(Para.6)Different opinions about global warming.Dr. Foster(a catastrophe)George Hambley(a positive thing)1.a rise in2.severe storms, __________,__________, famines3.the spread of4.the disappearance of1.Plants will2.Crops will3.There will be a greater rangeofStep3 Further reading True or False（）1.The temperature in the last century seemed to increase much.（）2. Everyone believes that global warming is caused by the activities of humans.（）3. The rise in carbon dioxide is causing a steady increase in global warming.（）4. George Hambley believes that global warming will do good rather than harm to the earth.（）5. It is clear what the effects of global warming will be.Step 4 Fill in the blanks to retell the passage.The temperature of the earth 1 (rise) about one degree during the 20th century. How has this come 2 ? All scientists subscribe 3 the view that it is human activity 4 has caused the 5 (globe) warming rather 6 a random but natural phenomenon. Some scientists think we add large 7 (quantity) of carbon dioxide to the air. Some scientists believe the burning of more and more fossil fuels 8 (have) resulted in the increase of carbon dioxide. Greenhouse gases continue to build 9 . It may be a catastrophe but George 10 (state) that it is a positive thing.Step 5 Free talk — a short speech 能力提升Between the two opinions ,decide on one to have a discussion in you group and then choose a speaker to give a speech on behalf of your group. The following information may help you.Step 6 Summary课后案I.课外延伸阅读Further reading about global WarmingGlobal warming is the unusually rapid increase in Earth’s average surface temperature ove century primarily due to the greenhouse gases released as people burn fossil fuels. The global averagesurface temperature rose 0.6 to 0.9 degrees Celsius (1.1 to 1.6°F) between 1906 and 2005, and the rate of temperature increase has nearly doubled in the last 50 years. Temperatures are certain to go up further.Earth’s natural greenhouse effect Earth’s temperature begins with the Sun. Roughly 30 percent ofincoming sunlight is reflected back into space by bright surfaces like clouds and ice. Of the remaining 70percent, most is absorbed by the land and ocean, and the rest is absorbed by the atmosphere. The absorbedsolar energy heats our planet. As the rocks, the air, and the seas warm, they radiate “infrared radiation). From the surface, this energy travels into the atmosphere where much of it is absorbedby water vapor and long-lived greenhouse gases such as carbon dioxide and methane. When they absorbthe energy radiating from Earth’s surface, microscopic water or greenhouse gas molecules turn into tiny heaters— like the bricks in a fireplace, they radiate heat even after the fire goes out. They radiate in alldirections. The energy that radiates back toward Earth heats both the lower atmosphere and the surface,enhancing the heating they get from direct sunlight. This absorption and radiation of heat by the atmosphere—the natural greenhouse effect—is beneficial for life on Earth. If there were no greenhouseeffect, the Earth’saverage surface temperature would be a very chilly -18°C (0°F) instead of the comfortable 15°C (59°F) that it is today.What has scientists concerned now is that over the past 250 years, humans have been artificiallyraising the concentration of greenhouse gases in the atmosphere at an ever-increasing rate, mostly byburning fossil fuels, but also from cutting down carbon-absorbing forests. Since the Industrial Revolutionbegan in about 1750, carbon dioxide levels have increased nearly 38 percent as of 2009 and methanelevels have increased 148 percent.II.拓展提高书面表达如何解决全球变暖是我们全人类共同面临的一个难题。
Please match the words with their proper meanings.1．lack A．the state of needing something that is absent or unavailable2．description B．respectable; having the qualities that deserve sb./sth.3．worthy C．a statement that represents something in words4．voluntary D．done willingly without being forced5．contribute E．to obtain, get or gain6．acquire F．to become larger in size or volume orquantity7．expand G．to give sth., especially money orgoods, to help sb.8．urgent H．(of something) that needs to be dealt with immediately9．starvation I．commodities (goods or services) sold to a foreign country10．export J．a state of extreme hunger resulting from lack of essential nutrients over a prolonged period答案：1.A 2.C 3.B 4.D 5.G 6.E7.F8.H9.J10.IWho or what organizations come to our rescue when we meet with natural disasters or need help？Look at the pictures and match them with the names.A．policemen B．firemen C．volunteersD．PLA men E．Red Cross F．doctors答案：1.D 2.E 3.A 4.C 5.B 6.FⅠ.Fast-reading1．According to the title we can learn the passage is about the_UN.2．The purpose of the passage is to_let_us_know_more_about_the_UN's_work.Ⅱ.Careful-reading(Ⅰ)Choose the best answers according to the text.1．What's Paragraph 3 mainly about?A．The UN touches people's lives in many aspects.B．The UN can have controlled over the armies of different countries.C．The UN mainly helps countries with urgent problems.D．The UN has every right to change the international laws.2．With the help of the media, the author's visiting countries where the UN has programmes to help people will ________.A．give more courage to people thereB．inform people of the work of the UNC．encourage more people to donate thingsD．attract local government's attention to the situationthere3．What occupation does Tang Ning take up in the UN?A．The Secretary-General.B．A Goodwill Ambassador.C．The spokesman.D．A clerk.4．How much money does she earn by doing the job?A．She earns a lot.B．She gets no salary for the job.C．She earns some, though not much.D．It isn't mentioned in the article.5．What project or projects has she been involved in?A．She helps develop the world's education.B．She helps deal with such problems as poverty and disasters.C．She visits countries where the UN has programmes to help people. D．She visits the poorest areas in the world.答案：1.A 2.B 3.B 4.B 5.C(Ⅱ)Fill in each blank with no more than three words according to the text.Ⅲ.Study-readingAnalyze the following difficult sentences in the text.1．Being a Goodwill Ambassador means that I visit countries where the UN operates programmes to help people.[句式分析][尝试翻译]作为一名亲善大使意味着我要前往联合国实施扶助项目的国家。
Unit 4 Global warmingPeriod 1 Warming Up ，Pre －reading ，ReadingLearning aims ：1.Get students to know about global warming and its effect ；2. To enable the students to realize what we can do about global warming.Learning important pointsTo enable the students to learn about global warming and to develop their reading ability.Learning difficult pointTo enable the students to talk about what we should do to prevent global warming.Before class （课前自主学习）I.重点单词1._________v.消费；消耗；耗尽2. _________v.趋向；易于；照顾3_________n.大灾难；浩劫 4._________adj.胡乱的；任意的5. _________v.反对；反抗；与(某人)较量 6_________.n.洪水；水灾7. _________v.同意；捐赠；订阅 8. _________ n.燃料9._________ n.量；数量 10. _________ n.图表；坐标图；曲线图11. _________ v.陈述；说明 12. _________ n.结果；后果；影响13._________ n.资料；数据 14._________ v.看一下；扫视 II.重点短语1. come about _________2.keep on_________3. subscribe to _________4. be opposed to _________5. _________ 大量的6.________即使_7. _________ 上升；增长；升起 8 _________依靠，依赖9 _________ 温室效应 10. _________用光，耗尽In class （课上合作探究）Learning proceduresStep 1 Warming up1．Warming up by reading and talking ：Read through the exercise. Put students in groups to talk about what we use energyfor ，discuss what are the sources of these energy and whether the following sources arerenewable or non －renewable.___________ ___________ ___________ ___________ __________ __________Things that use energySources of energy Renewable/non －renewable coal oil natural gas wind power solar energy nuclear energy lightsheatingtelevisioncassette playervideo recordercomputerfridgestovehydro －electricpower biomass energygeothermal energyhairdryer...tidal energyStep 2 Pre －reading1．Look at the picture of a greenhouse and ask students what a greenhouse is made of and what its purpose is.2．Ask students what they think “greenhouse gases” are and what they think greenhouse gases do. Look at the picture above and explain it to their partners.Step 3 Reading and comprehendingTask 1．SkimmingAsk students to read the passage quickly so as to get the key words and general idea of eachparagraph and answer the following questions ：(1)What is the main topic of the article?________________________________________________________________________(2)Who wrote the magazine article ？What is the name of the magazine?________________________________________________________________________(3)What are the names of the three scientists mentioned in the article ？Do they agree with one another?________________________________________________________________________(4). What do they think about global warming? Do they agree with one another?________________________________________________________________________(5). What are the two graphs about?________________________________________________________________________Task 2.ScanningChoose the best answers to each question according to the text(1).How much did the temperature rise in the 1900s?A. One degree Fahrenheit.B. One CelsiusC. Two degreesD. Thirty degree Celsius(2).What causes the temperature of the earth to increase?A. Cutting treesB. Wasting the farmlandC. Running out of the river waterD. Burning fossil fuels(3).Who accurately measured the amount of carbon dioxide in the atmosphere from 1957 to 1997?A. Dr. Janice Foster.B. Fahrenheit.C. Charles KeelingD. George Hambley(4). George Hambley believes that more carbon dioxide is actually_____.A. a bad thingB. a dangerous thing.C. a comparative thingD. a positive thing(5).What is the main idea of this passage?A. Global warming.B. Flood phenomenon.C. Making methane.D. Making greenhouses Task 3．Careful readingRead the passage carefully and judge whether the statements are true(T) or false(F)．①Janice Foster believes that global warming is caused by the burning fossil fuels.( )②Natural gas is a greenhouse gas.( )③Carbon dioxide is a byproduct of burning fossil fuels.( )④People accept Charles Keeling's data because he took accurate measurements.( )⑤Flooding could be one of the effects of future global warming.( )⑥George Hambley believes scientists are just guessing about the effects of global warming.( )⑦George Hambley is worried about the effects of carbon dioxide on plant growth.( )⑧It is clear what the effects of global warming will be.( )Task 4．Structure analyzingAsk students to read the text carefully and try to find out how many parts they can divide the text into and find out the main idea of each part.Part Main ideaPart1(Paragraph__) A It's up to readers to think and decide whether people should dosomething about global warming or not.Part 2(Paragraphs __to __) B To illustrate how global warming comes about.Part 3(Paragraph __) C To introduce a debate over the issue of global warming.Part 4(Paragraph__ ) D To list two different attitudes among scientists towards theglobal warmingStep 4 随堂达标检测The earth is becoming warmer and it is human activity _______1 has caused this global warming .All scientists_________2 to the view that the increase in the earth’s temperature is_________3 to the burning of fossil fuels. Some byproducts of this process, especially carbon dioxide, are called ‘greenhouse’ gases. Some small amounts of gases in theatmosphere_________4 heat from the sun and therefore warm the earth .So we need those gases .However, the problem begins when we add huge _________5 of extra carbon dioxide into the atmosphere. It caused the global temperature to __________6 up.A scientist __________7 Charles Keeling made accurate measurements of the amount of carbon dioxide in the atmosphere. But how high will the temperature _________8 go?_________9 if we start reducing the amount of carbon dioxide and other greenhouse gases, the climate is going to _______10 on warming for decades or centuries. Now one knows the effects of global warming.Unit 4 Global warmingPeriod 2 Language pointsLearning aims：1.Get students to learn and grasp important new words and expressions2.Get students to learn and grasp some difficult and long sentences in the text.Before class（课前自主学习）I.重点单词1._________ adj. 能再生的；可更新的2. ________ n. 温室；花房3. ________ prep. 每；每一4. ________ n. 资料；数据5. ________ n. 洪水；水灾6. ________ n. 旱灾；干旱7. ________ vt. 反对;与（某人）较量8. ________ adj. 温和的；温柔的；淡的9.________adj. 环境的10. ________ vt. 陈述；说明11. ________ n. 种类；范围12. ________ adv. 平稳地；持续地II.重点短语1．在20 世纪期间____________ 2．自然现象____________3．另一方面____________ 4．通过燃烧化石燃料____________5．人类活动 ____________ 6．有关系，有影响____________7．大体上，基本上____________ 8．高达5摄氏度____________III.重点句型1.That probably doesn’t sound very much to you or to me but it is a rapid increase compared to mostnatural changes.（译）________________________________________________________________________2. There is no doubt that the earth is becoming warmer but there is fierce debate over whether it is human activity that has caused this global warming or whether it is just a natural phenomenon.（译）________________________________________________________________________3. Without the “greenhouse effect”, the earth would be about thirty-three degrees Celsius cooler than it is.（译）________________________________________________________________________In class（课上合作探究）Language points1．...but it is a rapid increase when_compared_to other natural changes.……但是，同自然界的其他变化相比，这种升高是迅速的。
