2018-2019宝安区一模(第一学期期末调研试卷)
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深圳市宝安区2018-2019学年第一学期期末模拟测试七年级英语(命题人:何俊霆考试时间: 90 分钟,试卷满分: 100 分)I. 听力(共15 小题,每小题1 分,小计15 分)i. 听对话,根据你所听到的对话选出问题的答案。
每段对话念两遍。
(4小题)1. What is the weather like?A. Rainy.B. Snowy.C. Sunny.2. Why doesn’t Dale see his uncle often?A. Because his uncle lives too far away.B. Because his uncle’s wife and his dad don’t get along very well.C. Because his mom and his uncle don’t get along very well.3. What is Jack’s favorite subject?A. Science.B. English.C. P.E.4. What kind of room does the man want?A. A single room.B. A double room.C. A twin room. ii.听录音,根据你所听到的问句选出合适的答句。
每个问句念两遍。
(3 小题)5. A. She likes pets. B. She looks tired. C. She has two big eyes.6. A. Yes, you could. B. Sure, go ahead. C. Good idea.7. A. He likes football. B. He is tall and strong. C. He is a doctor.iii. 听录音,根据你所听到的答句,选出合适的问句。
每个答句念两遍。
(4 小题)8. A. What is the date today? B. What day is it today?C. How is the weather today?9. A. When will you watch the movie? B. What do you think of the movie?C. Where will you watch the movie?10. A. Do you like the clubs in your school? B. Is your school far from your home?C. Is your school playground big or small?11. A. Why do people turn on the lights in the garden? B. When do people turn on the lights in the garden?C. How often do people turn on the lights in the garden?iv. 听对话,根据你所听到的对话,写出问题的答案。
8安区2018-2019学年第一学期调研测试卷高三生物2018.9 说明:1.本试卷分第Ⅰ卷(选择题)和第Ⅱ卷(非选择题)两部分,满分100分,考试时间90分钟。
2.答题前,请检查试卷和答题卡是否完整无破损;然后将考生信息用规定的笔填涂在答题卡的指定位置。
3.答题时将答案写在答题卷的指定位置;不得使用涂改液。
4.保持答题卡的整洁,考试结束后,只上交答题卡。
第Ⅰ卷(选择题,共40分)一、选择题(本题共20小题,每小题2分,共40分。
在每小题给出的四个选项中,只有一项是符合题目要求)1.下列有关酵母菌、颤藻、菠菜叶肉细胞的叙述,正确的是A.都有细胞膜,且都含有DNA和RNAB.都有核糖体,核糖体形成都与核仁有关C.都有细胞壁,细胞壁的成分也都是纤维素D.都有线粒体,都能通过有氧呼吸获得能量2.下图是[H]随化合物在生物体内的转移过程,下面对其分析正确的是A.②过程中为五碳化合物还原B.⑤过程需氧气参与C.⑤⑥过程均在线粒体中进行D.能形成A TP的过程有①②④⑤⑥⑦3.生物体内、外具有调节细胞生命活动的化学物质被称为信息分子。
它们A.是在核糖体上合成的B.可以是大分子也可以是小分子C.可直接参与细胞代谢D.发挥作用后其数量和性质不变4.有关右图所示结构及其所发生的部分生化反应(其中e-表示电子)的叙述中,正确的是A.图示结构为双层膜的叶绿体B.生成的A TP可用于酶的合成C.其能量转化顺序为光能→电能→化学能D.图中的O2扩散到线粒体至少需要通过4层膜5.下列关于某生物兴趣小组用洋葱进行相关实验的叙述中,正确的是A.利用洋葱鳞片叶内表皮为材料观察不到质壁分现象B.利用洋葱绿色叶片可观察叶绿体形态并对叶绿体进行计数C.将新鲜的洋葱根尖成熟区细胞直接放到清水中,其形态变化不明显D.低温处理洋葱根尖分生区细胞可使该区大部分细胞染色体数目加倍高三生物第1页(共7页)6.神经系统正常发育过程中神经细胞数量的调节机制如图所示。
2018-2019学年第一学期宝安区期末调研测试卷高一生物2019.1第Ⅰ卷(选择题,共60分)一、单项选择题:本大题共30小题,每小题2分,共60分。
在每小题给出的四个选项中,只有一个选项符合题目要求,选对的得2分,选错或不答的得0分。
1.每一个生物科学问题的答案都必须在细胞中寻找,最可能的原因是A.细胞内能发生一切生命活动B.有些生物只由一个细胞构成C.生命活动是在细胞内或细胞参与下完成的D.细胞是一切生物体结构和功能的基本单位2.艾滋病是由HIV病毒感染人体免疫系统的淋巴细胞引起的,目前仍无有效治疗方法。
已知HIV是一种RNA病毒,下列关于HIV的说法正确的是A.HIV可以离开细胞独立生存B.HIV属于生命系统的个体层次C.HIV只有核糖体一种细胞器D.HIV组成成分与核糖体相似3.下图表示四种不同的生物,其中叙述不正确的是A.四种细胞均由先前的细胞分裂产生B.四种细胞均没有以核膜为界的细胞核C.丙中的伸缩泡利于增大物质运输效率D.丁的摄食过程可体现细胞膜的流动性4.以下关于拟核的表述,正确的是A.拟核具有单层膜结构B.将原核细胞的中央位置称为拟核C.拟核中无染色体,但有丝状的染色质D.拟核中无染色质,但有一个环状的DNA分子高一生物第1页(共8页)5.下列有关组成生物体化学元素的论述,正确的是A.组成生物体的化学元素在无机自然界都可以找到B.人、动物和植物所含的化学元素种类差异很大C.占细胞干重和鲜重百分比最多的元素都是CD.Cu、Mg、Ca等微量元素对生物体非常重要6.分别缺少下列什么元素会导致人体出现地方性甲状腺肿、肌肉抽搐、贫血等症状A.钠、钾、锌B.钾、铁、镁C.碘、钙、铁D.铁、碘、钙7.人和动物细胞中起储存能量作用的糖类是A.脂肪B.淀粉C.糖原D.麦芽糖8.蛋白质在生物体内具有重要作用。
下列叙述正确的是A.蛋白质化学结构的差异只是R基团的不同B.蛋白质盐析过程中空间结构没有发生变化C.蛋白质控制和决定着细胞及整个生物体的遗传特性D.检测生物组织中的蛋白质需同时加入斐林试剂甲和乙9.核酸是生物体内携带遗传信息的物质。
深圳市宝安区2019-2019学年第一学期期末调研测试卷九年级化学 2019.1说明:1. 全卷分第一卷和第二卷,共8页。
第一卷为选择题,第二卷为非选择题。
考试时间60分钟,满分100分。
2. 答题前,请将学校、班级、考生号和姓名写在答题卷相应位置并用2B铅笔把准考证号涂好。
3. 第一卷选择题(1-25)每小题选出答案后,用2B铅笔涂到答题卡的相应位置上;第二卷非选择题(26-30)答案必须写在答题卡指定的位置上。
考试结束,答题卡交回。
4. 可能用到的相对原子质量:Ca-40 C-12 0-16 H-1 C1-35.5第一卷(选择题,共50分)一、选择题(在下列1-25小题中,每小题只有一个选项符合题意,请将正确答案用2B铅笔涂到答题卡上,每小题2分,共50分)1. 下列说法正确的是()A. 为了保护环境,可将实验剩余药品放回试剂瓶B. 右图1是我国“国家节水标志”,地球淡水资源少,要爱惜水C. 汽车改用乙醇汽油可以完全避免对空气的污染D. 我国化石能源有限,应该禁止开采2. 世界是物质的,物质是不断地变化的,下列变化属于物理变化的是()A. 路边的铁栏杆生锈B. 通过蒸馏将自来水变成纯水C. 植物的光合作用D. 牛奶发酵变成酸奶3. 下列实验操作正确的是()4. 下列化学用语与所表述的意义相符的是()A.2N——氮气中氮元素的化合价为0 B. 2H——2个氢元素C. 2Mg+2 ——2个镁离子D. Fe3O4——氧化铁5. 关于物质的组成和构成的下列说法,不正确的是()A. 硫酸厂污水直接排放放导致整段河水污染,说明污水中的微粒在做无规则运动B. 氯化钠是由钠离子和氯离子构成C. 氧气和臭氧都是由氧元素组成的单质D. 双氧水(H2O2)由氢分子和氧分子构成6. 下列关于四种粒子的结构示意图的说法中正确的是()A. ①③是不同种元素B. ②中X=2C. ②④的化学性质相似D. 只有①表示离子7. 图甲是元素周期表中的部分信息,图乙是微粒结构示意图,下列说法正确的()A. 若甲和乙属于同种元素,则X的值为18B. 硫元素的相对原子质量为32.06gC. 若乙是带一个单位负电荷的离子,则乙是硫离子D. 硫原子核带16个单位的正电荷8. 对于下列物质分类正确的是()A. 汞、金刚石、磷、硫是非金属B. 洁净的空气、软水、冰水混合物、天然气是混合物C. 氯酸钾、冰、二氧化锰、二氧化碳是氧化物D. 碘酒、医用酒精、糖盐水是属于溶液9. 下列有关物质变化的描述正确的是()A. 燃烧都是物质与氧气发生的剧烈的化合反应B. 氧化钙、氢氧化钠遇水放热,都是发生了化学变化C. 白磷自燃是缓慢氧化引起的D. 高锰酸钾、氯酸钾、双氧水、分离液态空气,这四种制取氧气的方法都属于分解反应10. 小希对某变化的微观示意图(如图所示)有如下的看法,正确的是()A. 这是一个汽化过程,属于物理变化B. 这是一个化学变化,反应物与生成物的微粒个数比为4:4:1C. 若示意图表示双氧水制取氧气,则甲图可代表过氧化氢溶液,属于混合物D. 该反应中涉及到的几种物质都含有氧元素,都属于氧化物11. 关于人体吸入空气和呼出气体成分探究的有关说法正确的是()A. 将空气通入澄清石灰水中不变浑浊,说明空气中不含二氧化碳B. 呼出气体不能使带火星木条复燃,说明呼出气体中不含氧气C. 空气不能在干燥玻璃片上形成水雾,说明空气中不含有水蒸气D. 对着干燥玻璃片哈气形成水雾,说明呼出气体中水蒸气含量增多 12. 下列关于空气的说法中,正确的是( )A. 空气的成分按质量分数从大到小为:N 2 78%、O 2 21%、稀有气体0.94%、CO 2 0.03%B. 液化空气中分离出的氮气化学性质不活泼,食品包装袋中充氮气可以防腐C. 硫在空气中燃烧的现象是:发出淡蓝色的光,生成刺激性气味的二氧化硫D. 二氧化碳是温室气体,属于大气污染物13. 下列变化中,不能用质量守恒定律解释的是( ) A. 蜡烛燃烧后逐渐变短B. 波义耳在敞口容器中加热水银,反应后质量增大C. 酒精敞口放置一段时间后质量减小D. 煤燃烧后变成煤灰,煤灰的质量比煤的质量小14. 小明对于蜡烛燃烧过程进行了一系列的探究,下列说法正确的是( )A. 点燃蜡烛后,电子秤示数逐渐减小(如图所示),蜡烛减小的质量等于燃烧后生成物的总质量B. 在燃烧的蜡烛上方罩上干冷烧杯,看到有水雾生成,说明蜡烛中一定含有氢氧两种元素C. 将大烧杯罩在燃烧蜡烛中,一会儿,蜡烛熄灭,说明蜡烛燃烧生成二氧化碳D. 已知蜡烛的主要成分x y C H 燃烧的方程式是2x 2y 2C 33O 25C 6H O 1H O ++点燃,则物质的化学式是2532C H15. 水是生命之源,也是重要的溶剂,下列有关水的说法正确的是( ) A. 水电解生成氢气和氧气,说明水中含有氢分子和氧分子 B. 用肥皂水可以区分硬水和软水C. 自来水厂将河水经沉降、过滤、吸附,灭菌、蒸馏等净化后,可供人们生活用水D. 生活通过煮沸可以将硬水变为纯水16. 下列有关碳及其化合物说法不正确的是( )A. 石墨、金刚石、C60由于原子排列方式不同,所以它们的性质不同B. CO 为可燃性气体,点燃前应该先验纯C. 二氧化碳气体通入紫色石蕊试液,溶液变红,可见二氧化碳与水生成的物质显酸性D. 右图4是用木炭还原氧化铜,该反应的化学方程式为:CuO+C 高温Cu+CO↑17. 关于燃料及其利用的相关知识叙述中,不正确的是()A. 物质发生化学反应的同时伴随着能量变化B. 将煤粉制成蜂窝煤,能增大与空气的接触面积C. 堆放杂物的纸箱着火用水浇灭,降低了可燃物的着火点D. 石油不充分燃烧会生成一氧化碳、二氧化硫等有害气体18. 下列关于溶液的叙述中,正确的是()A. 溶液一定是均一的、稳定的、无色透明的液体B. 所有的溶液的溶剂只能是液体C. mg食用放入ng水中,充分振荡,形成的食盐水的质量一定等于(m+n)gD. 粗盐提纯操作中,蒸发皿出现NaCl晶体停止加热,此时蒸发皿中的溶液是氯化钠的饱和溶液19. 关于物质的溶解性及溶解度,下列说法正确的是()A. 喝了汽水常常会打嗝,这说明温度升高,气体的溶解度增大B. 所有物质的溶解度只受温度影响C. 0℃时,硝酸钾的溶解度是13.3g,所以硝酸钾属于可溶物质D. 同种物质在不同溶剂中的溶解性是不同的,例如碘在水中溶解性小,而在汽油中溶解性大20. 图中为A、B两种固体物质的溶解度曲线,下列说法正确的是()A. 在t1 ℃时,A、B两种物质的溶解度相同B. t2 ℃时,A物质饱和溶液的质量分数为25%C. 将t2 ℃时A、B两种物质的饱和溶液降至t1 ℃(其他条件均不变),溶质的质量分数保持不变的是AD. A溶液中混有少量B,用蒸发溶剂方法提纯A21. 通过下列图示实验得出的结论中,不正确的是()A. 图甲所示实验既说明甲烷具有可燃性,又说明甲烷中一定含有氢元素B. 图乙所示实验既说明氢气密度比空气小,又说明氢气在常温下不与氧气反应C. 图丙所示实验既可以用于固液分离,也可用于液液分离D. 图丁所示实验既可以用于检验氢气的纯度,也可以检验甲烷的纯度22. 下列有关物质的鉴别所用试剂及方法中,不正确的是()23. 同学们在使用过氧化氢制取氧气之后,想要回收二氧化锰,下列说法不正确的是()A. 将二氧化锰和废液分离,同学们应该采用的操作是过滤B. 如果滤纸没有紧贴漏斗壁,过滤速度会减慢C. 为了使过滤充分,过滤时,玻璃棒应该不停搅拌D. 不考虑实验过程的损耗,同学们最终烘干获得的二氧化锰质量应该与起初取用的质量相同24. 碳和碳的化合物间的部分转化关系如图所示,则下列说法正确的是()A. 由碳酸转化成X一定要在加热条件下进行B. 由碳转化为X一定发生的是化合反应C. 物质X一定是二氧化碳D. 若使一氧化碳转化成X,只能通过一氧化碳在空气(或氧气)中燃烧获得25. 下列实验所对应的图像中不正确的是()A. 向NaOH溶液滴加B. 将一定质量硝酸C. 加热KClO3、MnO2混D. 完全相同的过氧化氢足量的水钾饱和溶液升高温度合物溶液制氧气第二卷(主观题,共50分)二、综合与实验(3小题,共32分)26.(12分)兴趣小组在进行电解水的实验时,为了增加电离速度,需要配置5%的NaOH溶液50克,下图是实验所需的药品与仪器:⑴所需NaOH的质量为__________,称量时药品需要放置在烧杯中称量。
2018-2019学年第一学期宝安区期末调研测试卷答案七年级语文一、单项技能考查(每题2分,共10分)1.C(A 怯qiè咄duō B 犷guǎng 垛duò D 虐nüè刨páo)2.A(B 嘲疲 C 跚寞 D 粹径)3.D(精益求精比喻已经很好了,还要求更好。
词含褒义,犯错误时用不合适。
)4.D(A“喜欢”是动词,“强壮”是形容词B“令爱”是对别人女儿的称呼。
C《论语》是儒家代表作。
)5.B(外语和听说考试不是合卷)二、诗文能力考查(21分)(一)课内外文言文阅读考查(11分)6.(1)急(2)相比(3)停止(4)等待(一词1分)7.(1)不如比作是柳絮乘风飘起。
(2分)(2)用衣服和被子塞住窗户(的缝隙),担心透漏光亮出去,被家里人发觉。
(2分)8.谢道韫:咏雪神形皆备,颇具巧思。
其才情让人佩服。
(1.5分)祖莹:夜以继日,想方设法抓紧学习。
这惜时如金、奋发努力的精神让人佩服。
(1.5分)(二)诗文默写能力考查(10分,一空1分)9.(1)自古逢秋悲寂寥,我言秋日胜春朝。
晴空一鹤排云上,便引诗情到碧霄。
(2)非淡泊无以明志(3)杨花落尽子规啼,闻道龙标过五溪。
(4)遥怜故园菊,应傍战场开。
(5)相信不屈不挠的努力(每空1分,漏、错一字该空不得分)三、现代文阅读能力考查(26分)(一)文学作品阅读(18分)10.A听我念书、念诗,鼓励“我”继续写诗(1分)B 挑中婶婶做模仿游戏的对象(1分)11.第一层级:没有结合文章内容说出用意(0分)第二层级:单点作答,只说用意(1分);示例:与后文作对比。
第三层级:联系文本内容说出写法(2分);示例:将照片上漂亮充满活力的婶婶和现实生活中躺在床上病重的婶婶进行了鲜明的对比。
第四层级:结合内容,分析写法,明确作用(3分);示例:将照片上漂亮充满活力的婶婶和现实生活中躺在床上病重的婶婶进行了鲜明的对比,更突出了婶婶虚弱等死时的窘迫现状。
2018-2019学年第一学期宝安区期末调研测试卷九年级英语I.听力测试Ⅱ.词汇。
(15小题,每小题1分,小计15分)i.从下面每小题的A、B、C三个选项中选出可以替换划线部分的最佳选项,并在答题卡上将相应的字母编号涂黑。
(8小题,每小题1分)14.-Throwing rubbish on the ground is considered to be a bad habit.--Sorry Madam, I won't do that againA. thoughtB. affordedC. introduced15.-- Have you ever travelled abroad?--Yes, I went to America with my parents last summerA. all over the worldB. to a foreign countryC. on your own16.- -Who is the director of this action film?--A celebrated director -Ang Lee. He has directed many excellent filmsA. silentB. famousC. rich17. -Why do the children in this kindergarten always look happy?--Because they are allowed to do whatever they like.A. everythingB. somethingC. nothing18- -Was the cruel man killed?--Yes. A policeman drew his gun and shot him when he was going to kill a second child.A looked for B. turned off C took out19.--Which TV programme do your classmates like best?--According to the survey, most of them like Super BrainA noticeB warmingC research20. ---Did you give your mother a gift on Mother's Day---Of course. And she was happy with it.A was proud of B. was pleased with C. was interested in21.--What happened? Why is the classroom in a mess?--Mary We'll clean it up right nowA. neat and tidyB. dark and smallC. dirty and untidyi.根据句子意思,从下面每小题的A、B、C三个选项中选出填入横线的最佳选项,并在答题卡上将相应的字母编号涂黑。
宝安区2018-2019学年第一学期期末调研测试卷高二化学2019.01注意:1.本卷所需相对原子质量:H-1;C-12;N-14;O-16;Na-23;Cu-64。
2.本卷考试时间为90分钟。
3.本卷满分为100分。
4.在答题卷相应的位置填写考生姓名,并准确填写考号和用2B铅笔涂黑考号。
5.答题结束时,请将答题卷交回。
第Ⅰ卷(共 42分)一.选择题(下列各题均只有一个合理答案,请将合理答案的序号涂在答题卡上,填在其它地方无效。
本题共14小题,每小题3分共42分)1.《本草纲目》中“石碱”的条目下写到:“采蒿蓼之属,晒干烧灰,以水淋汁,凝淀如石,可浣衣发面”。
其中“石碱”的主要成分是指A.K2CO3B.KAl(SO4)2 C.KOH D.KCl2.龋齿实际是牙釉质溶解的结果。
已知牙釉质的主要成分是羟磷灰石,口腔中存在如下平衡:①羟磷灰石Ca5(PO4)3OH(s)5Ca2+(aq)+3PO43-(aq)+OH-(aq)②氟磷灰石的化学式是Ca5(PO4)3F,Ca5(PO4)3F(s)5Ca2+(aq)+3PO43-(aq)+F-(aq),氟磷灰石的溶解度比羟磷灰石小。
下列有关说法中不正确...的是A.一定条件下,羟磷灰石可以转化为氟磷灰石B.氟磷灰石有阻止龋齿的作用C.使用添加NaF等氟化物的牙膏可以防治龋齿D.当糖附着在牙齿上发酵时,会产生H+,所以多吃糖可以防治龋齿3.下列各组离子在指定溶液中一定能大量共存的是A.能使甲基橙变红的溶液中:Na+、AlO-2、SO2-4、Cl-B.0.1 mol·L-1的NaHCO3溶液:K+、Al3+、NO3-、Cl-C.c(H+)/c(OH-)=1×10-14的溶液:K+、Na+、ClO-、NO3-D.由水电离的c(OH-)=1×10-13的溶液:NH4+、Na+、SO42-、CH3COO-4.N A是阿伏加德罗常数,下列说法正确的是A.0.1 molNa2CO3溶于水,溶液中阴离子数小于0.1 N AB.常温下,体积1L pH =2的醋酸溶液中含有的H+数目为0.01N AC.一定条件下,6g H2与28g N2充分反应后,体系中分子总数2N AD.电解精炼铜实验中,每转移2N A电子,则阳极溶解64gCu高二化学第1页(共6页)高二化学 第2页 (共6页)5.已知:①2H 2(g)+O 2(g)=2H 2O(l) ΔH 1=-571.6 kJ·mol -1②2CH 3OH(l)+3O 2(g)=2CO 2(g)+4H 2O(l) ΔH 2=-1452 kJ·mol -1③H +(aq)+OH -(aq)=H 2O(l) ΔH 3=-57.3 kJ·mol -1下列说法正确的是A .H 2(g)的燃烧热为571.6 kJ·mol -1B .同质量的H 2(g)和CH 3OH(l)完全燃烧,H 2(g)放出的热量多C .12H 2SO 4(aq)+12Ba(OH)2(aq)=12BaSO 4(s)+H 2O(l) ΔH =-57.3 kJ·mol -1D .3H 2(g)+CO 2(g)=CH 3OH(l)+H 2O(l) ΔH =+131.4 kJ·mol -16.以下实验操作、现象以及推断均正确的是22CO 2(g) + 4H 2(g)CH 4(g) + 2H 2O(g),若温度从300℃升至400℃,反应重新达到平衡时,H 2的体积分数增加。
2018-2019学年第一学期宝安区期末调研测试卷七年级英语2019.1I,听力测试(20小题,选择题12分,听取信息5分,信息询问3分,小计20分)i-iii略。
Iv,信息询问。
(3小题)18,你想知道Ken认为这部电影怎么样,你问Ken:_________________________________________________________________19,你想知道Ken隔多久去旅行一次,你问Ken;_________________________________________________________________20,你想知道Ken最喜欢哪张明星片,你问Ken;_________________________________________________________________II,单词辨音(5小题,每小题1分,小计5分)从A,B,C,三个选项中选出与所给单词划线字母相同发音的单词。
( )21,dream A, break B, breathe C, headline( )22,Brightly A, engineer B, sightseeing C, bridge( )23,Natural A, fact B, geography C, spaceship( )24,Blow A, follow B, town C, power( )25,Across A, pollute B, remote C, blogIII ,词汇(共15小题,每小题1分,小计15分)i,从下面每小题的A,B,C三个选项中选出可以替换划线部分的最佳选项。
(5小题)( )26, --It is raining, Bring an umbrella with you , Tom . It protects you from the rain.--I will , mum , thanks . I can look after myself.A, Keeps B,helps C, makes( )27, --Jason, what do you usually do on Thanksgiving Day in the US?--We usually have a big meal with our relatives and have a good talk together.A, people from different places B, friends from the same schoolC, people from the same family( )28, -We plan to go to Fenghuang Mountain on Sunday, Jenny, would you like to go with us ?--Sounds great ! But I have to finish my English report first so that I will be free then.A, not usual B, not busy C, not happy( )29, --November 11, also called Double Eleven, is now a large shopping festival .--That’s true , It provides people with chances to buy things at low prices at .A, ties B, makes C, gives( )30,--Mum, do you like the gift ? I looked all over the shopping center for it .--oh, dear , It is just wonderful.A, everywhere in B, something in C, outside ofIi ,根据句子意思,从下面每小题A,B,C三个选项中选出恰当的词语完成句子。
宝安区2018-2019学年第一学期期末调研测试卷高一化学2019.01注意:1.本卷所需相对原子质量:H-1; C-12; N-14; O-16; Na-23; Fe-56; Mn-55。
2.本卷考试时间为90分钟。
3.本卷满分为100分。
4.在答题卷相应的位置填写考生姓名,并准确填写考号和用2B铅笔涂黑考号。
5.答题结束时,请将答题卷交回。
第Ⅰ卷(共60分)一、选择题(下列各题均只有一个合理答案,请将合理答案的序号涂在答题卡上,填在其它地方无效。
本题共20小题,每小题3分共60分)12.西汉时期的《淮南万毕术》中记载“曾青得铁则化为铜”,是湿法冶金的先驱,文中“曾青”是指硫酸铜溶液。
下列说法正确的是A.铁和铜能导电,是电解质B.上述反应中,“曾青”被氧化,是氧化剂C.上述反应属于置换反应D.上述反应的另一种产物是硫酸铁3.下列物质按纯净物、胶体、电解质、氧化物的顺序组合的一组为A.稀盐酸、氨水、硫酸、干冰B.蒸馏水、雾、碳酸氢钠、二氧化硫C.胆矾、云、食盐水、二氧化硅D.生石灰、泥水、氯化铜、碳酸钠4.下列关于胶体的叙述正确的是A.将饱和FeCl3溶液滴入稀NaOH溶液中,加热至沸腾,制得Fe(OH)3胶体B.NaCl溶液和Fe(OH)3胶体本质不同在于是否有丁达尔效应C.从颜色上无法区别FeCl3溶液和Fe(OH)3胶体D.胶体化学的应用广泛,是制备纳米材料的方法之一高一化学第1页(共6页)5.葡萄糖是一种有机物,其化学式为C6H12O6。
检测人的血液中葡萄糖(简称血糖)的含量,参考指标常以两种计量单位表示,即“mmol/L”和“mg/dL”(1L=10dL,1mol=1000mmol,1g=1000mg)。
以“mmol/L”表示时,血糖正常值在 3.61~6.11 mmol/L之间。
下列说法正确的是A.葡萄糖是电解质B.葡萄糖的摩尔质量为180gC.血糖检测结果为92 mg/dL属于正常D.葡萄糖溶液不能通过半透膜6.N A为阿伏加德罗常数,下列说法中正确的是A.常温常压下,14gN2含有原子数为N AB.在标准状况下,22.4L H2O含有分子数为N AC.5.6g铁与足量硝酸反应转移的电子数为0.2N AD.1mol/LBaCl2溶液中含有Cl﹣的数目为2N A7.下列危险警示标签与物质的化学性质不相符的是剧毒品易燃液体8.在酸性溶液中,能大量共存的离子组是A.Fe3+、K+、SO2-4、Cl-B.Ca2+、Cl-、HCO- 3、NO3-C.Na+、Fe2+、MnO-4、SO2-4D.Na+、Al3+、SO2-4、OH-9.如图所示为“铁链环”结构,图中两环相交部分A、B、C、D表示物质间的反应。
宝安区2018-2019学年第一学期期末调研测试卷高一数学2019.1说明:1.全卷共三道大题,满分150分,考试时间120分钟。
2.答题前,请检查试卷和答题卡是否完整无破损;然后将考生信息用规定的笔填涂在答题卡的指定位置。
3.答题时将答案写在答题卷的指定位置;不得使用涂改液。
4.保持答题卡的整洁,考试结束后,只上交答题卡。
一、选择题(本大题共10个小题,每小题5分,共50分,在每小题给出的四个选项中只有一项是符合题目要求的。
)1.已知集合{}2,1,0,1,2A =--,()(){}120B x x x =-+<,则A B =( ) A.1ln 24- B.1ln 24+ C.2ln 213- D.1ln 23+ 2.化简cos15cos 45sin15sin 45︒︒-︒︒的值为( )A.12B.C.12-D.3.函数()lg f x x =的定义域是( ) A.02x <≤B.01x <≤C.12x -<≤D.12x <≤4.已知正方形ABCD 中,点B 、F 分别是DC 、BC 的中点,那么EF =( )A.1122AB AD + B.1122AB AD --C.1122AB AD -+D.1122AB AD - 5.若将函数2sin 2y x =的图像向左平移三个单位长度,则平移后图像的对称轴为( )A.()26k x k Z ππ=-∈ B.()26k x k Z ππ=+∈C.()212k x k Z ππ=-∈D.()212k x k Z ππ=+∈ 6.已知函数()()()22o 0l g f x a x a a =++>的最小值为8,则( ) A.()5,6a ∈B.()7.8a ∈C.()8,9a ∈D.()9,10a ∈7.已知θ为△ABC 的一个内角,且sin cos m θθ+=,若()0,1m ∈则关△ABC 的形状的判断,正确的是( )A.锐角三角形B.钝角三角形C.直角三角形D.三种形状都有可能8.已知向量12BA ⎛= ⎝⎭,312BC ⎛⎫= ⎪⎪⎝⎭,则∠ABC =( )A.30°B.45°C.60°D.120°9.函数()f x 在(+∞,+∞)单调递减,且为奇函数;若()11f =-,则满足()121f x -≤-≤的x 的取值范围是( ) A.[2,2]B.[-1,1]C.[0,4]D.[1,3]10.已知函数()()()sin 0,0,πf x A x A ωϕωϕ=+>><的部分图象如图所示,则函数()()cos g x A x ωϕ=+图象的一个对称中心可能为( )A.5,02⎛-⎫⎪⎝⎭B.1,06⎛⎫⎪⎝⎭ C.1,02⎛-⎫ ⎪⎝⎭D.11,06⎛-⎫ ⎪⎝⎭二、填空题(本大题共4小题,每小题5分,共20分。
宝安区2018-2019学年第一学期期末调研测试卷高二英语(共两卷满分150分)第一卷第一部分听力理解(共三节,满分15分)第一节疑问句翻译(共3题,每小题1分,满分3分)1. 你认识那个穿深蓝色大衣的男子吗?2.上周你为什么不乘飞机去北京?3.这两个酒店你更满意哪一个,贵点的那个,还是便宜点的那个?第二节听对话,回答问题。
(共3小题,每小题2分,满分6分)4. _________________________________5. _________________________________6. _________________________________第三节听一段独白,将独白的大意写在答题卷上。
(满分6分)7.____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ _____________________第二部分阅读(共两节,满分40分)第一节阅读理解(共15小题,每小题2分,满分30分)阅读下列短文,从每题所给的A、B、C和D项中,选出最佳选项,并在答题卡上将该项涂黑。
AIt's the middle of the night in the sleepy French town of Levignac, outside of the city Toulouse.There are people lined up along the town’s main road, waiting for a parade to begin. But there are no marching bands f decorated floats at this I a.m. event. Instead, there appears a convoy(护航队) of six trucks each pulling an enormous trailer(拖车) carrying a huge part of the world's largest passenger airliner, the Airbus A380.The crowds applaud as the plane's wings, body and tail sections inch their way through the provincial town. Sometimes there is just 50 centimeters clearance on each side between the plane parts and the buildings. People in the buildings are watching--right in front of their windows-the parade, which is repeated every few weeks. Toulouse, located in South France, is the site of the Airbus Headquarter. It is where single-aisle A320s and wide-body A330s and A350s are built.Since its first delivery to Singapore Airlines in 2007, more than 200 A380s have rolled off the line in Toulouse. Most of them, more than 100, are flown by the Dubai-based Emirates Airlines.The production of the main parts for the A380 is spread throughout Europe: the wings are built in Broughton, Wales; body sections come from Hamburg, Germany and Saint-Nazaire, France; the tail from Cadiz, Spain, and Hamburg. Other smaller parts come from suppliers 2ll over the world. An A380 is made up of about four million individual parts produced by 1, 500 companies from 30 countries Getting the huge parts to the FAL (Final Assembly Line) in Toulouse is an unbelievably complicated process. They come by sea to Pauillac, France, where they are unloaded. From there, traveling only at night, the convoy takes three evenings to cover the 335 kilometers to Toulouse, on the roads which are especially designed to handle the extreme size of the A380 's sections.1. What are the people waiting for? ______A. A celebration parade.B. Some famous Airbus passengersC. The arrival of A380 parts.D. A newly-built world's largest airliner.2. How does the convoy pass the town at night? ______A. It tries not to do it secretlyB It's very slow to avoid buildingsC It proudly displays what it carries.D It usually takes a whole nig3. What kind of city is Toulouse? ______A It's close to the Airbus Headquarter.B It' s home to the biggest airlinesC It's where not only A380s are built.D It produces most parts of A380BHave you ever pressed the pedestrian button at a crosswalk and wondered if it really worked? Or pushed the "close door" button in an elevator, while doubting that it may, in fact, have no effectwhatsoever?You're not alone, and you may be right. The world is full of buttons that don't actually do anything They're sometimes called "placebo buttons"--buttons that are mechanically sound can be pushed, but provide no use. These buttons may still serve a purpose, according to Ellen Langer, a Harvard psychologist who pioneered a concept known as the "illusion of control". "They do have a psychological effect, " she said in a phone interview. "Taking some action leads people to feel a sense of control over a situation, and that feels good, rather than ju st being a passive bystander.”In New York City, only about 100 of the 1, 000 crosswalk buttons actually function, confirmed a spokesperson from the city’s Department of Transportation. That number has steadily decreased in recent years: When New York Times revealed that the majority of New York's buttons didn't work in 2004, about 750 were still operational. In London, which has 6,000 traffic signals, pressing the pedestrian button results in a reassuring " Wait" light. But that doesn't necessarily mean that the "green man" will appear any sooner.So what about the "close door" button in elevators? If you live in the US, it almost certainly doesn't work.-"To put it simply, the riding public will not be. able to make the doors close any faster using that button, "said Kevin Brinkman of the National Elevator Industry. But there's a very good reason for this: the Americans with Disabilities Act of 1990. "This Act requires that an elevator's doors remain open long enough for anyone with disability or mobility issues, such as using a wheelchair, to get onboard the cab safely, "said BrinkmanSo, pressing the button will do nothing. It's only there for firefighters, emergency personnel and maintenance workers, who can override the delay with a key or a code. But outside the US, there's a higher chance--though not a certainty--that the button will work.4. Which of the following is the meaning of "sound" underlined in paragraph 3? ______A in good conditionB. in a loud voiceC in proper placeD. in suitable size5. What does Ellen Langer think of the buttons that don't really work? ______A. They are of no use at allB. They badly need repairingC. They make bystanders passive.D. They are just comfort6. What's common about the crosswalk buttons in New York and London? ______A. Only one tenth actually work.B. Many have been removedC. They are often of no actual useD. They are of the same design7. Why doesn't the "close door" button in elevators work in the US? ______A It's required so by lawB. It's operated by special personnelC. It works if there's a wheelchair.D. Its key or code is often lostCOne of the biggest complaints in modern society is being over-scheduled. Ask people at a social gathering how they are and the answer is always "super busy". When people aren't super busy at work, they are crazy busy exercising, entertaining or playing fantasy football. And if there is ever a still moment for reflective thought--say, while waiting in line in a store--out comes the mobile phone. So it is worth noting a study published in the journalScience, which shows how far people will go to avoid self-reflection.We have noted how addicted to our devices we all seem to be and that people seem to find any excuse they can to keep busy. " said Timothy Wilson, a psychology professor at the University of Virginia. One of his experiments involving more than 700 people shows, amazingly, that most people find it unpleasant to be alone with their thoughts for just 6 to 15 minutes.It could be because human beings, when left alone, tend to think about what's wrong in their lives: difficult relationships, personal failures, money trouble, health concerns. So they keep themselves busy. Louis C.K, a comedian(喜剧演员), has once described that not-good feeling: " Sometimes when things clear away and you're not watching anything and you're in your car and you start going.. Oh no, here it comes-that I'm alone-and it startsto visit you, just this sadness, he said. "And that's why people text and drive. They are willing to risk taking a life and running their own because they don't want to be alone for a second, because it’ s so hard.."But you can't solve or let go of problems if you don't allow yourself time to think about them. Ignoringthem will only give them more power. Slow down, look at them, and think about yourself. We don't have to be that "super bus y”.8. Why are people e always super busy nowadays ______A. They’re always bothered by others.B. They work even when entertaining.C. Their jobs are too demanding.D. They actually choose to be like that.9. How does Professor Wilson feel about the findings of his experiments? ______A. It's normal to be busyB. Many excuses are reasonableC. The fact is shockingD. They match his prediction10. What does Louis C.K. say about feeling alone? ______A It's a difficult experienceB. You' ll be fine when you drive.C. It's not bad to have self-time.D. For a comedian it often happens.11. Which of the following is the best title for the text? ______A. No Time to Think?B. Too Busy to Enjoy LifeC. Why not stop and rest?D. Be YourselfDWhen Katsunori and Kaori Osaka had their first child, they were living in a small apartment in Nagoya, a city of more than 2 million people in central Japan.Like many other young couples, they tried to raise their child in the city but found life among the apartment blocks too crowded and expensive, with few child care choices. Eventually, they gave up.The Osakas moved to Nagi, where Katsunori grew up. The sleepy agricultural town in western Japan has become a success story in the country's efforts to boost its declining birth rate. With a population of about 6,000, Nagi feels a world away from Nagoya, and residents take the lack of busy streets and crowds as reasons why it is a great place to bring up children.But they’re not the only benefits: Nagi also pays couples who live there to have children. Families receive a one-time 100,000 yen(S879)payment for their first child, 150,000 yuan (S1, 335) for their second and as much as 400,000 yen(S3, 518)for the fifth child born to the same family. The payments have been rising, and Nagi is also offering parents other benefits (housing, kids' schooling, nursery costs, etc. ) to help improve the towns birth rateAnd they appear to be working..In the neighborhood where the Osakas live, most couples have three or more children because they can and they want to. Between 2005 and 2014, the town's birth rate--based on the average number of children a woman has in her lifetime -doubled from 1. 4 to 2. 8. Then it has dipped slightly to 2.39, but is still considerably higher than the national average of 1.46.Japan has been on a steady birth rate decline since the 1970s. In 2017. fewer than 950,000 babies were born while the number of deaths rose to a postwar high of 1.3 millionThe country's total population stands at 127 million, and children make up just 12.3% of the total, compared with 18. 9% for the US, 16.8% for China and 30. 8% for India. according to government figures. And by 2065, Japan's population is expected to drop to about 88 million.12. What was the most importer. t reason why the Osakas moved from Nagoya to Nagi?A Nagi is Katsunori' s hometown.B Nagoya is crowded and expensive.C. They wanted to have easier jobsD. Nagi is better in child care.13. What kind of place is Nagi?A Small in size, it is even richer than big cities. B. People here are encouraged to have a big familyC. Its birth rate has kept rising in the past decadeD. Though an agricultural town, it has a big population14. Which of the following does "they" in paragraph 5 refer to?A Parents living in NagiB Benefits offered to parentsC One-time payments D. Child care choices15. What can we infer from the article?A. The richer a country is, the lower its birth rate fallsB. Japan's population is not a problem in a long runC. Nagi' s success has been copied by big citiesD. The trend of a nation’s birth rate is hard to change.第二节(共5小题,每小题2分,满分10分)根据短文内容,从短文后的选项中选出能填入空白处的最佳选项,选项中有两项为多余选项。
九年级语文(上册)测试卷参考答案及评分标准(2018.09)期末测试一、本大题共5小题,每小题2分,共10分。
1.A2.D3.B4.A5.C二、本大题共1小题,每空1分,共10分。
6.(1)直挂云帆济沧海(2)人有悲欢离合(3)病树前头万木春(4)山雨欲来风满楼(5)树绕村庄(6)少年不识愁滋味(7)气象万千(8)雾凇沆砀(9)春蚕到死丝方尽蜡炬成灰泪始干三、本大题共三段阅读,计12小题,共33分。
(一)阅读下面【甲】【乙】两篇选文,完成7~9题。
(9分)7.(2分,每个0.5分)(1)像鸟儿张开翅膀一样(2)命名,取名(3)超过(4)写8.(4分,每句2分)(1)醉翁的情趣不在酒上,而是在于山光水色之中啊。
(2)文章的缺点不必等人来批评指正,自己写多了就能看出来。
9.(3分)欧阳修被贬官后的人生态度是:沉醉山水之乐,并与民同乐,不去介怀贬谪之事,豁达放旷;写作态度是:勤奋读书,多写文章,多作修改,长此以往,就能写出好文章。
(意对即可)(二)阅读下面选文,完成10~13题。
(10分)10.(2分)珍爱自己(学会爱自己)。
渴望别人的关爱(或:需要通过别人来肯定自己热爱自己)。
11.(3分)不多余。
这里写女音乐家毁灭自己的事情,是从反面论证“人应该学会爱自己”,与第二段中的正面论证形成鲜明的对比,突出观点。
(意对即可)12.(3分)比喻论证。
使得说理生动形象,通俗易懂,更好地论证了“爱自己,就是要我们学会勤于律己和矫正自己”这一观点。
(意对即可)13.(2分)因为学会爱自己,体现了对生命本身的崇尚和珍重;因为这是真正懂得珍爱世界的前提。
(意对即可)(三)阅读下面选文,完成14~18题。
(14分)14.(2分)(1)委屈(或伤心)的泪(2)高兴(或感激)的泪15.(3分)交待麻婶的热心和马兰花的友谊,为下文写马兰花不提借钱的事作铺垫。
(意对即可)16.(3分)大方善良,富有同情心。
诚恳老实,知恩图报;坚强,不妥协。
2018-2019学年第一学期宝安区期末调研测试卷高一生物参考答案一、单项选择题:本大题共30小题,每小题2分,共60分。
在每小题给出的四个选项中,只有一个选项符合题目要求,选对的得2分,选错或不答的得0分。
题号12345678910答案C D B D A C C B A A 题号11121314151617181920答案B B D D C C A D C C 题号21222324252627282930答案C D B A B D B C A C二、非选择题:本大题共5小题,共40分。
31.(共8分,每空1分)(1)降低反应的活化能(2)蛋白质酶的种类专一性(3)未发出荧光ATP才是生命活动的直接能源(葡萄糖不可直接为生命活动提供能量)(4)A-P~P~P吸能32.(共8分,除特殊标注外,每空1分)(1)参与生化反应、构成细胞结构、良好的溶剂、为细胞提供液体环境、运输营养物质和代谢废物(任答一点即可)(2分)(2)以热能的形式散失合成ATP(或蛋白质的合成)(3)蛋白质、核酸(2分,各1分)(4)自由扩散C6H12O6─酶→2C2H5OH+2CO2+能量(2分)33.(共9分,除特殊标注外,每空1分)(1)叶绿体类囊体膜(2)ADP和Pi C5(3)CO2适宜的条件下,植物光合作用作用强度高于呼吸作用强度,CO2含量会降低(2分)(4)增强线粒体、叶绿体、细胞质基质(2分)34.(共9分,除特殊标注外,每空1分)(1)分化(或生长)衰老(2)纺锤丝牵引染色体移向细胞两极(3)基因进行细胞间的信息交流(4)原癌基因和抑癌基因(5)蛋白质合成加工“车间”、脂质合成“车间”(2分)35.(共6分,每空1分)(1)西瓜汁为红色有颜色干扰甘蔗汁富含的蔗糖不是还原糖(2)只有两条色素带(合理答案即给分)(3)使染色质中的DNA和蛋白质分离,有利于DNA与染色剂结合不需要(4)大于。
D
B
图1 2018-2019学年第一学期宝安区期末调研测试卷
九年级数学
2019.1 一、选择题
1.下面的几何体中,俯视图为三角形的是()
A.B.C.D.
2.一元二次方程0
)2
(2=
-
x的根是()
A.2
=
x B.2
2
1
=
=x
x C.2
1
-
=
x,2
2
=
x D.0
1
=
x,2
2
=
x
3.如图1,在矩形ABCD中,对角线AC、BD交于点O,若
∠COD=50°,那么∠CAD的度数是().
A.20° B.25°
C.30° D.40°
4.已知1
-是一元二次方程0
1
2=
+
+bx
ax的一个根,则b
a-的值是()
A.1
-B.0 C.1 D.无法确定
5.已知菱形的面积为10,对角线的长分别为x和y,则y关于x的函数图象是()
A.B.C.D.
6.在不透明的袋子里装有16个红球和若干个白球,这些球除颜色外不同外无其他差别。
每次从袋子里找出一个球记录下颜色后再放回,经过多次重复试验,发现摸到白球的频率稳定在0.6.,则袋中白球有()
A.12个B.20个C.24个D.40个
7.如图2,这是某市政道路的交通指示牌,BD的距离为3m,从D点测
得指示牌顶端A点和底端C点的仰角分别是60°和45°,则指示牌的高
度,即AC的度度是()
A.3
3B.2
3
C.2
3
3
3-D.3
3
3-
8.下列说法正确的是()
x
x
图2
A .两条对角线互相垂直且相等的四边形是正方形
B .任意两个等腰三角形相似
C .一元二次方程022
=--ax x ,无论a 取何值,一定有两个不相等的实数根
D .关于反比例函数x
y 4
=
,y 的值随x 值的增大而减小 9.如图3,已知ABO ∆与DCO ∆位似,且ABO ∆与DCO ∆的面积比为1:4,点B 的坐标
为3(-,)2,则点C 的坐标为( )
A .3(,)2-
B .6(,)4-
C .4(,)6-
D .6(,)4 10.如图4,在菱形ABCD 中,60=∠A °,AB=2,点M 为边AD 的中点,连接BD 交CM 于点N ,则BN 的长是( ) A .1 B .
34 C .3 D .33
2 11.二次函数c bx ax y ++=2
的图象如图5所示,以下结论中正确的是( ) A .0<abc B .042
>-b ac C .当1<x 时,y 随x 的增大而减小 D .024>+-c b a
12.如图6,矩形ABCD 中,AB=8,AD=14,点M 、N 分别为边AD 和边BC 上的两点,且M N ∥AB ,点E 是点A 关于直线MN 的对称点,取CD 的中点F ,连接EF 、NF ,分别将EDF ∆沿着EF 所在的直线折叠,将CNF ∆沿着NF 所在的直线折叠,点D 和点C 恰好重合于EN
上的点G 。
以下结论中:○
1EF ⊥NF ;○2CNE MNE ∠=∠;○3MNE ∆∽DEF ∆;○4四边形MNCD 是正方形;○
5AM=5.其中正确的结论是( ) A .○
1○2 B .○1○4 C .○1○3○5 D .○1○4○5 二、填空题 13.已知
5
2y
x =,则=-y y x 2 。
14.抛物线562
+-=x x y 向上平移3个单位长度,再向左平移2个单位长度后,得到的抛物线解析式是 。
15.如图7,在A 时测得一棵大树的影长为4米,B 时又测得该树的影长为6米,若两次日照的光线互相垂直,则树的高度是 米。
16.如图8,在平面直角坐标系中,直线x y 31=与双曲线x k
y =(0≠k )
x
A
图3
图4
图
6
图7
交于点A ,过点C 0(,)2作AO 的平行线交双曲线于点B ,
连接AB 并处长与y 轴交于D 0(,)4,则k 的值为 。
三、解答题(5+8+5+8+7+9+10=52分)
18.有3张正面分别写有数字2-,0,1的卡片,它们的背面完全相同,现将这3张卡片背面朝上洗匀。
小明先从中任意抽出一张卡片记下数字为x ;小亮再从剩下的卡片中任意取出一张记下数字为y ,记作x P (,)y 。
(1)用列表或画树状图的方法列出所有可能的点P 的坐林海雪原。
(2)若规定:点x P (,)y 在第二象限则小明获胜,点x P (,)y 在第四象限则小亮获胜。
游戏规则公平吗?
19.如图9,一次函数21+-=x y 的图象与反比例函数x
k y =
2(0≠k )的图象分别交于第二、四象限的A 、B 两点,点A 的横坐标为1-。
(1)求反比例函数的表达式;
(2)根据图象回答:当x 取何值时,21y y <。
请直接写出答
案 。
20.如图10,在□ABCD 中,AD AC ⊥,延长DA 于点E ,使得AE DA =,连接BE 。
(1)求证:四边形AEBC 是矩形。
(2)过点E 作AB 的垂线分别交AB 、AC 于点F 、G ,连接CE 交
AB 于点O ,连接OG ,若AB=6,30=∠CAB °,求OGC ∆的面积。
21.天猫商城某网店销售某款蓝牙耳机,进份为100元。
在元旦即将来临之际,开展了市场调查,当蓝牙耳机销售单价是180元时,平均每月的销售量是200件,若销售单价每降低2元,平均每月就可以多售出10件。
(1)设每件商品降低x 元,该网店平均每月获得的利润为y 元,请写出y 与x 的函数关系式;
(2)该网店应该如何定价才能使得平均每月获得的利润最大,最大利润是多少元?
图9
图10
22.如图11,在矩形ABCD 中,AB=4,BC=2,点E 是BC 边的中点。
动点P 从点A出发,沿AB 运动到点B 停止,速度为每秒钟1个单位长度,连接PE ,过点E 作PE 的垂线交射线AD 于点Q ,连接PQ ,设点P 的运动时间为t 秒。
(1)当1=t 时,=∠PEB sin ; (2)是否存在这样的t 值,使APQ ∆为等腰直角三角形?若存在,求出相应的t 值;若不存在,请说明理由; (3)当t 为何值时, PEQ ∆的面积等于10?
23.如图12,抛物线c bx x y ++=2
与x 轴相交于A 、B 两点,与y 轴相交于点C ,已知抛物线的对称轴所在的直线是4
9
=
x ,点B 的坐标为4(,)0。
(1)抛物线的解析式是 ;
(2)若点P 是直线BC 下方抛物线上一动占,当ABC ABP ∠=∠2时,求出点P 的坐标。
(3)若M 为x 轴上一动点,在抛物线上是否存在点N ,使得B 、C 、M 、N 构成的四边形是菱形,若存在,求出N 点的坐标;若不存在,请说明理由。
图11
备用图。