2017高考一卷b答案,2017年全国高考一卷答案

1.2017高考英语真题分类汇编阅读理解真题及答案

2.2017年数学高考卷子的六道大题

　高三的学生免不了要做大量的试卷，这样比较容易让学生适应高考，下面是我给大家带来的有关于山东省的地理石军的介绍，希望能够帮助到大家。

山东省临沂市2017届高三地理试卷介绍

　第I卷 (选择题 共50分)

　本卷共25小题，每小题2分，共50分。在每小题给出的四个选项中，只有一项是最符合题目要求的。

　某人驾车匀速从图1中的a地到e地，单位距离油耗仅受地形影响而变化，道路中相邻两个小黑点之间的油耗相同。据此完成1~2题。

　1.行程中，a?b、b?c、c?d、d?e四路段中，一直上坡的是

　A.a?b B.b?e

　C.c?d D.d?e

　2.推测b?d段绕行c地的影响因素最可能是

　A.森林 B.地形

　C.耕地 D.村落

　将光伏发电技术与轨道交通相结合，不但能解决建筑本身的用能问题，还可为轨道机车提供动力。图2为我国某城市轨道交通站候车厅(局部)，太阳能电池板主要集中于穹型屋顶中上部。据此完成3?4题。

　3.太阳能电池板弧形延伸的方向最可能是

　A.东?西方向

　B.南?北方向

　C.东南?西北方向

　D.西南?东北方向

　4.影响该城市轨道交通站候车厅太阳能电池板分布位置的主要因素是

　A.昼夜长短 B.天气状况

　C.日照时长 D.太阳高度

　T岛是世界上著名的旅游胜地，当地热带风光旖旎。岛屿地形以山地和平原为主。图3是T岛示意图。据此完成5~6题。

　5.影响T岛城镇分布的主要因素是

　A.气候 B.地形 C.河流 D.洋流

　6.当游客于3月24日在T岛海边看到日出美景时，北京

　A.夕阳西下 B.烈日当空 C.夜幕深沉 D.晨光初现

　某中学地理兴趣小组对学校附近地区进行考察，记录结果如表1。据此完成7~8题。

　表l

　7.花岗岩形成过程中，与其两侧接触的沉积岩可能会变质成

　A.大理岩、板岩 B.片麻岩、大理岩 C.石英岩、片麻岩 D.石英岩、板岩

　8.符合学生往东南方向行进时观察到的岩石的地质构造剖面是

　平均气温距平是指某时段平均气温与总平均气温的差值。图4为上海地区某时段平均气温距平(℃)分布图。据此完成9~l0题。

　9.若仅考虑该地区气温分布和气压之间的关系，P点此时近地面的风向大致为

　A.西北风 B.西南风

　C.东北风 D.东南风

　10.若仅考虑等温线分布的因素，上海城市用地扩展最具潜力的方向是

　A.东北方向 B.西北方向

　C.西南方向 D.东南方向

　柬埔寨的洞里萨湖是一个水量季节变化很大的大湖。洞里萨湖北部的吴哥通王城两边有两个巨大的长方形人工湖西池和东池。这两个大水池并不是在地面挖坑形成的，而是在地表四面筑起墙垣形成高于地面的水库，是著名的古老的灌溉工程(见图5)。据此完成11～12题。

　11.这两个地上水库最主要的直接补给水源是

　A.雨水 B.湖泊水

　C.地下水 D.人工提水

　12.这两个地上水库能有效发挥灌溉作用的时间是

　A.2～6月 B.5~9月

　C.8～12月 D.11~次年4月

　某野外求生训练营进行荒岛求生训练时，在沙滩上利用水循环原理获取淡水，如图6所示。图7为当日塑料薄膜上下气温变化示意图。据此完成13~15题。

　13.图6获取淡水过程中，未体现出的水循环环节是

　A.蒸发 B.降水

　C.水汽输送 D.径流

　14.当日，最容易获取淡水的时段是

　A.日出前后 B.中午前后

　C.日落前后 D.午夜前后

　15.推测目前此方法没有被世界各地用以建设海水淡化厂的最主要原因是

　A.效率低 B.破坏环境

　C.成本高 D.技术不成熟

　毛里求斯曾经是欧洲通往印度、中国等亚洲国家途中最重要的海上补给站和中继点，战略地位十分重要。后来毛里求斯港口地位下降。图8为毛里求斯位置图。据此完成16~17题。

　16.毛里求斯港口地位下降的主要原因是

　A.苏伊士运河的修建 B.巴拿马运河的开通

　C.北极航线的开通 D.亚欧大陆桥的修建

　17.一艘油轮在毛里求斯附近发生原油泄漏，油污最可能首先出现在

　A.非洲西海岸 B.日本东海岸

　C.澳大利亚西海岸 D.欧洲西海岸

　图9为天山博格达峰北坡垂直自然带图。据此完成18～19题。

　18.图中甲自然带的类型为

　A.温带落叶阔叶林带

　B.温带草原带

　C.温带荒漠带

　D.针阔混交林带

　19.博格达峰北坡自然带丰富完整，是体现垂直地带性规律的典范，其形成受下列因素影响最小的是

　A.纬度位置 B.山体坡度

　C.大气环流 D.海拔高度

　图10模拟某流域在人为开发前后的变化，该模拟可为日后流域开发提供参考。据此完成20～21题。

　20.此模拟研究主要针对的是

　A.植被破坏 B.蒸发减少

　C.湿地调蓄 D.降雨增加

　21.人为改变后造成的流域各项特性变化，其中包括①河流流程缩短②流水侵蚀加强③河流流速加快④流域面积扩大

　A.①② B.①④

　C.③④ D.②③

　人口净迁移率=人口迁入率-人口迁出率。图11示意我国2012年省际人口净迁移率与城市化率线性关系。据此完成22～23题。

　22.据图可知

　A.城市化水平与人口净迁移率呈正相关

　B.受自然因素的影响，贵州人口迁出率最高

　C.北京迁入人口数量最多是因为北京经济最发达

　D.人口迁移在一定程度上提高了人口流入区和流出区的城市化水平

　23.关于黑龙江省人口净迁移率和城市化率的叙述，正确的是

　A.人口净迁移率低主要是受气候因素的影响

　B.人口净迁移率低主要是受经济因素的影响

　C.城市化水平较高主要是因为第三产业的迅速发展

　D.城市化水平较高主要是因为黑龙江省地广人稀，人口数量少

　城市不同功能区发展程度的差异可以通过功能区人口迁移结构反映出来。图12为某城市功能区某年的不同年龄段人口迁移数量统计图。据此完成24～25题。

　24.该功能区最可能是

　A.商业区

　B.住宅区

　C.工业区

　D.行政区

　25.该功能区内最迫切需要增加的配套设施是

　A.养老院

　B.医院

　C.商业网点

　D.幼儿园和小学

　第II卷 (综合题 5小题共50分)

　注意：答卷前请将答题卡最上面的项目填写清楚。

　26.阅读图文材料，完成下列要求。(10分)

　随着城市化进程的不断加快，人们对城市环境质量的要求和关注程度也越来越高。下面为我国华北地区某城市高中学校研究性学习小组搜集的他们所在城市的相关信息。

　材料一 该城市及郊区地形剖面图 材料二 该城市1990年和2010年土地覆盖百

　材料三 表2该城市市中心与郊区下午4时的气温差

　(1)结合地形和植被状况，分析该城市冬季空气自净能力下降的原因。(4分)

　(2)指出土地利用的变化，给该城市环境带来的负面影响。(2分)

　(3)分析该城市城郊之间近地面污染物迁移的方向及原因，并提出改善城区空气质量在郊区应采取的有效措施。(4分)

　27.阅读图文材料，完成下列要求。(11分)

　在流域的开发过程中，土地利用发生了深刻变化，流域状况受到人类活动的强烈干扰。

　材料一 滦河流域示意图(图15)

　材料二 近几十年来，滦河流域气温呈显著上升趋势，图16为年降水量和年径流量变化

　材料三 滦河流域土地利用类型及变化(图17)

　(1)从地形、气候要素概括滦河流域自然环境的主要特征。(4分)

　(2)分析从20世纪60年代至今，滦河年径流量呈下降趋势的原因。(4分)

　(3)从可持续发展的角度提出保护和改善滦河流域水质的建议。(3分)

　28.阅读图文材料，完成下列要求。(9分)

　青海湖是我国最大的内陆咸水湖，湖泊周围地区土地荒漠化不断加剧，东西岸沙漠化面积扩大。湖区盛行西北风，最大风力达9～10级。位于布哈河口的鸟岛在20世纪70年代末由湖中孤岛变成半岛。

　(1)分析鸟岛由湖中孤岛变成半岛的原因。(3分)

　(2)简述青海湖东部沙漠的形成过程。(3分)

　(3)为抑制湖区西部沙漠化的不断扩展，请提出治沙措施。(3分)

　29.阅读图文材料，完成下列要求。(10分)

　丹麦是全球将能源问题解决得最好的国家之一。

　材料一 丹麦区域位置 材料二 丹麦能源消费构成变化

　(1)简析丹麦水能蕴藏量不丰富的原因。(3分)

　(2)简析丹麦开发利用风能资源的有利自然条件。(2分)

　(3)概述1980～2005年丹麦能源消费构成的变化特点。(3分)

　(4)丹麦矿物能源使用量并不大，却是欧洲酸雨严重的地区之一。简要分析其成因。(2分)

　30.阅读图文材料，完成下列要求。(10分)

　L河一年四季均清澈见底，掩映在绿树红花中，似项链般点缀着M城。K海峡一年中只有2个多月风平浪静，是游泳爱好者泅渡海峡的最佳季节。

　(1)分析L河一年四季河流清澈见底的自然原因。(4分)

　(2)N城气温较M城高，试从N城的角度分析原因。(3分)

　(3)判断游泳爱好者泅渡K海峡的最佳季节并说明判断理由。(3分)

2017高考英语真题分类汇编阅读理解真题及答案

第三部分 语言运用(共两节，满分45分)

　第一节 完形填空(共20小题;每小题1.5分，满分30分)

　阅读下面短文，从短文后各题所给的A、B、C和D四个选项中，选出可以填入空白处的最佳选项，并在答题纸上将该项涂黑。

　Alia Baker is a librarian in Iraq. Her library used to be a 36 place for all who loved books and liked to share knowledge. They 37 various matters all over the world. When the war was near, Alia was 38 that the fires of war would destroy the books, which are more 39 to her than mountain of gold. The books are in every language ? new books, ancient books, 40 a book on the history of Iraq that is seven hundred years old. (kaoshi.yjbys.com)

　She had asked the government for 41 to move the books to a 42 place, but they refused. So Alia took matters into her own hands. 43 , she brought books home every night, 44 her car late after work. Her friends came to 45 her when the war broke out. Anis who owned a restaurant 46 to hide some books. All through the 47 , Alia, Anis, his brothers and neighbours took the books from the library, 48 them over the seven-foot wall and 49 them in the restaurant. The books stayed hidden as the war 50 . Then nine days laters, a fire burned the 51 to the ground.

　One day, the bombing stopped and the 52 left. But the war was not over yet. Alia knew that if the books were to be safe, they must be 53 again while the city was 54 . So she hired a truck to bring all the books to the houses of friends in the suburbs(郊区). Now Alia waited for the war to end and 55 peace and a new library.

　36. A. meeting B. working C. personal D. religious

　37. A. raised B. handled C. reported D. discussed

　38. A. worried B. angry C. doubtful D. curious

　39. A. practical B. precious C. reliable D. expensive

　40. A. then B. still C. even D. rather

　41. A. permission B. confirmation C. explanation D. information

　42. A. large B. public C. distant D. safe

　43. A. Fortunately B. Surprisingly C. Seriously D. Secretly

　44. A. starting B. parking C. filling D. testing

　45. A. stop B. help C. warn D. rescue

　46. A. intended B. pretended C. happened D. agreed

　47. A. war B. night C. building D. way

　48. A. put B. opened C. passed D. threw

　49. A. hid B. exchanged C.burnt D. distributed

　50. A. approached B. erupted C. continued D. ended

　51. A. restaurant B. library C. city D. wall

　52. A. neighbours B. soldiers C. friends D. customers

　53. A. sold B. read C. saved D. moved

　54. A. occupied B. bombed C. quiet D. busy

　55. A. dreamed of B. believed in C. cared about D. looked for

非选择题部分 　第三部分 语言运用(共两节，满分45分)

　第二节(共10小题：每小题1.5分，满分15分)

　阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。

　Last October , while tending her garden in Mora , Sweden , Lena Pahlsson pulled out a handful of small 56 (carrot) and was about to throw them away. But something made her look closer , and she noticed a 57 (shine) object. Yes, there beneath the leafy top of one tiny carrot was her long-lost wedding ring.

　Pahlsson screamed 58 loudly that her daughter came running from the house. ?she thought I had hurt 59 (I),?says Pahlsson

　Sixteen years 60 (early), Pahlsson had removed the diamond ring 61 (cook) a meal. When she wanted to put the ring back on later, it was gone. She suspected that one of her three daughters ?then ten, eight, and six? had picked it up, but the girls said they hadn't. Pahlsson and her husband 62 (search) the kitchen, checking every corner, but turned up nothing. ?I gave up hope of finding my ring again," she says. She never replaced it.

　Pahlsson and her husband now think the ring probably got 63 (sweep) into a pile of kitchen rubbish and was spread over the garden, 64 it remained until the carrot?s leafy top accidentally sprouted (生长) through it. For Pahlsson, its return was 65 wonder.

第四部分 写作(共两节，满分40分)

　第一节 应用文写作(满分15分)

　假定你是李华，计划组织一次郊游，请给你的英国朋友Chris写封邮件邀请他参加。内容包括：

　1. 参加者;

　2. 时间、地点;

　3. 活动：登山、野餐等。

　注意：

　1. 词数80左右;

　2. 可以适当增加细节，以使行文连贯。

　第二节 读后续写(满分25分)

　阅读下面短文，根据所给情节进行续写，使之构成一个完整的故事。

　On a bright, warm July afternoon, Mac Hollan, a primary school teacher, was cycling from his home to Alaska with his friends. One of his friends had stopped to make a bicycle repair, but they had encouraged Mac to carry on, and they would catch up with him soon. As Mac pedaled (骑行) along alone, he thought fondly of his wife and two young daughters at home. He hoped to show them this beautiful place someday.

　Then Mac heard quick and loud breathing behind him. ?Man, that's a big dog!? he thought. But when he looked to the side, he saw instantly that it wasn?t a dog at all, but a wolf, quickly catching up with him.

　Mac?s heart jumped. He found out his can of hear spray. With one hand on the bars, he fired the spray at the wolf. A bright red cloud enveloped the animal, and to Mac's relief, it fell back, shaking its head. But a minute later, it was by his side again. Then it attacked the back of Mac's bike, tearing open his tent bag. He fired at the wolf a second time, and again, it fell back only to quickly restart the chase(追赶)。

　Mac was pedaling hard now. He waved and yelled at passing cars but was careful not to show down. He saw a steep uphill climbbefore him. He knew that zxxk once he hit the hill, he?d be easy caught up and the wolf?s teeth would be tearing into his flesh.

　At this moment, Paul and Beeky were driving their car on their way to Alaska. They didn?t think much of it when they saw two cyclists repairing their bike on the side of the road. A bit later, they spotted what they, too, assumed was a dog running alongside a man on a bike. As they got closer, they realized that the dog was a wolf. Mac heard a large vehicle behind him. He pulled in front of it as the wolf was catching up fast, just a dozen yards away now. (kaoshi.yjbys.com)

　注意：

　1. 所续写短文的词数应为150左右;

　2. 应使用5个以上短文中标有下划线的关键词语;

　3. 续写部分分为两段，每段开头语已为你写好;

　4. 续写完成后，请用下划线标出你所使用的关键词语。

参考答案

　第一部分 听力

　1. C 2. A 3. C 4. B 5. A

　6. C 7. A 8. B 9. C 10 . B

　11. B 12. C 13. A 14. B 15. A

　16. B 17. C 18. A 19. C 20 . A

　第二部分 阅读理解

　21. C 22. D 23. B 24. D 25. A

　26. C 27. B 28. A 29. B 30. C

　31. D 32. C 33. B 34. A 35. F

　第三部分 语言运用

　36. A 37. D 38. A 39. B 40. C

　41. A 42. D 43. D 44. C 45. B

　46. D 47. B 48. C 49. A 50. C

　51. B 52. B 53. D 54. C 55. A

　56. carrots 57. shiny/shining 58. so

　59. myself 60. earlier 61. to cook

　62. searched 63. Swept 64. where

　65. a

　第四部分 写作

　(略)

更多2017年高考英语真题分享阅读：

2017年数学高考卷子的六道大题

　考生能否在英语科考试中取得高分取决于阅读理解的成绩。一起做一下阅读理解训练吧。下面是我为大家推荐的2017高考英语真题分类汇编阅读理解真题及答案，仅供大家参考!

　2017高考英语真题分类汇编阅读理解真题及答案一

　In one way of thinking, failure is a part of life. In another way, failure may be a way towards success. The ―spider story‖ is often told. Robert Bruce, leader of the Scots in the 13th century, was hiding in a cave from the English. He watched a spider spinning a web(蜘蛛织网). The spider tried to reach across a rough place in the rock. He tried six times without success. On the seventh time he made it and went on to spin his web. Bruce is said to have taken heart and to have gone on to defeat the English? Edison, the inventor of the light bulb, made hundreds of models that failed before he found the right way to make one.

　So what? First, always think about your failure. What caused it? Were conditions right? Were you in top from yourself? What can you change so things will go right next time?

　Second, is the goal(目标)you're trying to reach the right one? Try to do some thinking about what your real goals may be. Think about his question, ?If I do succeed in this, where will it get me?This may help you prevent failure in things you shouldn't be doing anyway.

　The third thing to bear in mind about failure is that it's a part of life. Learn to ―live with yourself‖ even though you may have failed. Remember, ―You can't win them all.‖

　1.This passage deals with two sides of failure. In paragraph 1, the author talks mainly about ______ .

　A.the value of failur B.how people would fail

　C.famous failures　D.the cause of failure

　2.The underlined phrase?made it?means ______ .

　A.succeeded B.failed C.gave D.got

　3.The lesson the spider taught Robert Bruce seems ______ .

　A.productive　B.straight forward C.sorrowful D.deep

　4.The author tells you to do all things except ______ .

　A.The think about the cause of your failure

　B.to check out whether your goals are right for you

　C.to consider failure as a part or life

　D.to bear in mind that you will never fail in your life

　5.Which of the following is NOT true?

　A.Bruce and Edison were successful examples. B.Failure may be regarded as a way toward success.

　C.Edison learned a lot from the lesson the spider taught Robert Bruce.

　D.One may often raise a question whether his goals are worth attempting.

　2017高考英语真题分类汇编阅读理解真题及答案二

　In sport the sexes(性别)are separate. Women and men do not run or swim in the same races. Women are less strong than men. That at least is what people say. Women are called the weaker sex, or, if men want to please them, the fair sex. But boys and girls are taught together at schools and universities. There are women who are famous Prime Ministers, scientists and writers. And women live longer than men . A European woman can expect to live until the age of 74, a man only until he is 68.Are women's bodies really weaker?

　The fastest men can run a mile in under 4 minutes. The best women need 4.5 minutes. Women's time are always slower than men's, but some facts are a surprise. Some of the fastest women swimmers today are teenage girls. One of them swam 400 metres in 4 minutes 21.2 seconds when she was only 16.The first?Tartan?in film was an Olympic swimmer, Johnny Weissmuller. His fastest 400 metres was 4 minutes 49.1 seconds, which is 37.9 seconds slower than a girl 50 years later! This does not mean that women are catching men up. Conditions are very different now and sport is much more serious. It is so serious that some women athletes are given hormone (荷尔蒙)injections(注射). At the Olympics a doctor has to check whether the women athletes are really women or not. It seems sad that sport has such problems. Life can be very complicated(复杂的) when there are two separate sexes!

　1.Women are called the weaker sex because ______ .

　A.women do as much as men

　B.people think women are weaker than men

　C.sport is easier for men than for women

　D.in sport the two sexes are always together

　2.Which of the following is true?

　A.Boys and girls study separately everywhere. B.Women do not run or swim in races with men.

　C. Famous Prime Ministers are women .

　D.Men can expect to live longer than women in Europe.

　3.?That at least is what people say?means people ______ .

　A.say other things , too

　B.don't say this much

　C.say this but may not think so

　D.only think this

　4.What problems does sport have?

　A.Some women athletes are actually men.

　B.Some women athletes are give hormone injections. C.Women and men do not run or swim in the same races.

　D.It is difficult to check whether women athletes are really women.

　5.In this passage the author implies that ______

　A.women are weaker than wen , but faster

　B.women are slower than men, but stronger

　C.men are not always stronger and faster than women

　D.men are faster and stronger than women

　答案：BBCBC

　2017高考英语真题分类汇编阅读理解真题及答案三

　People bury treasure to stop other people from taking it. They choose a quiet place, dig a deep hole and bury the treasure in it. Then they make a map of where the treasure is or write down other clues(线索)that will help them or someone else to find it again.

　In Britain a few years ago; a writer wrote about some treasure that he had buried. He put clues in the story to help readers find it. Thousands of people hunted for the treasure. They dug holes all over Britain, hoping to find it.

　One of the most popular adventure stories ever written is Robert Louis Stephenson's ?Treasured Island?, an exciting story about a young boy, Jim Hawkins, who is captured by pirates and later finds some buried treasure.

　Then there is the true story about a man who had to travel overseas for a year. He did not trust banks, so he buried his life savings in a park. Then he went away. On his return, he went straight to the park. But the park was no longer there. In its place there was a huge building.

　And then there was the man who buried his savings, all in bank notes, in a waterproof(防水的) bag. When he dug it up years later, there was nothing left. Worms and insects had eaten the bag and everything in it.

　And of course, these are stories about people who bury things and either forget where they have buried them or lose the map.

　Although it is true that people sometimes lose their money because a bank fails, banks are still the safest place to keep our savings and treasures.

　1.People who bury treasure usually

　A.do not trust banks

　B.have a little money .

　C.want to live in a quiet place.

　D.expect to lose it

　2.The writer in Britain

　A.really had buried something.

　B.started a nationwide treasure hunt.

　C.had lost his treasure and wanted people to help him find it.

　D.caused trouble because people dug holes everywhere.

　3.―Treasure Island‖

　A.is a story about pirates.

　B.is about the adventures of Jim Hawkins.

　C.is the most popular story ever written

　D.is a well-known fairy tale.

　4.The man who buried his money in a park

　A.thought his money was safer there than in a bank.

　B.travelled on the sea for a year.

　C.got his life savings back again.

　D.stayed away longer than he expected.

　5 . From these stories we understand that

　A.we cannot trust banks.

　B.we should not trust anyone.

　C.a waterproof bag is not proof against worms and insects.

　D.insects eat anything.

　答案：ABBAC

17.（12分）

△ABC的内角A，B，C的对边分别为a，b，c，已知△ABC的面积为

（1）求sinBsinC;

（2）若6cosBcosC=1,a=3,求△ABC的周长

18.（12分）

如图，在四棱锥P-ABCD中，AB//CD，且

(1)证明：平面PAB⊥平面PAD；

(2)若PA=PD=AB=DC,,求二面角A-PB-C的余弦值.

19．（12分）

为了监控某种零件的一条生产线的生产过程，检验员每天从该生产线上随机抽取16个零件，并测量其尺寸（单位：cm）．根据长期生产经验，可以认为这条生产线正常状态下生产的零件的尺寸服从正态分布N(μ,σ?)．

（1）假设生产状态正常，记X表示一天内抽取的16个零件中其尺寸在(μ–3σ,μ+3σ)之外的零件数，求P(X≥1)及X的数学期望；学科&网

（2）一天内抽检零件中，如果出现了尺寸在(μ–3σ,μ+3σ)之外的零件，就认为这条生产线在这一天的生产过程可能出现了异常情况，需对当天的生产过程进行检查．

（ⅰ）试说明上述监控生产过程方法的合理性；

（ⅱ）下面是检验员在一天内抽取的16个零件的尺寸：

9.95

10.12

9.96

9.96

10.01

9.92

9.98

10.04

10.26

9.91

10.13

10.02

9.22

10.04

10.05

9.95

经计算得，，其中xi为抽取的第i个零件的尺寸，i=1,2,…,16．

用样本平均数作为μ的估计值，用样本标准差s作为σ的估计值，利用估计值判断是否需对当天的生产过程进行检查？剔除之外的数据，用剩下的数据估计μ和σ（精确到0.01）．

附：若随机变量Z服从正态分布N(μ,σ2)，则P(μ–3σ<Z<μ+3σ)=0.997?4，0.997?416≈0.959?2，．

20.（12分）

已知椭圆C：x?/a?+y?/b?=1（a>b>0），四点P1（1,1），P2（0,1），P3（–1，√3/2），P4（1，√3/2）中恰有三点在椭圆C上.

（1）求C的方程；

（2）设直线l不经过P2点且与C相交于A，B两点.若直线P2A与直线P2B的斜率的和为–1，证明：l过定点.

21.（12分）

已知函数=ae?^x+（a﹣2）e^x﹣x.

（1）?讨论的单调性；

（2）?若有两个零点，求a的取值范围.

（二）选考题：共10分。

请考生在第22、23题中任选一题作答，如果多做，则按所做的第一题计分。

22．[选修4-4，坐标系与参数方程]（10分）

在直角坐标系xOy中，曲线C的参数方程为（θ为参数），直线l的参数方程为.

（1）若a=-1，求C与l的交点坐标；

（2）若C上的点到l的距离的最大值为，求a.

23.[选修4—5：不等式选讲]（10分）

已知函数f（x）=–x?+ax+4，g(x)=│x+1│+│x–1│.

（1）当a=1时，求不等式f（x）≥g（x）的解集；

（2）若不等式f（x）≥g（x）的解集包含[–1，1]，求a的取值范围.