安徽省合肥市2020年高三第三次质量检测英语试卷(含答案)

2020-2021学年安徽省合肥市凤凰桥中学高三英语测试题含解析一、选择题1. ---I will have to think about it again．--- If you _ , you may lose the opportunity to compete altogether．A．hesitate B．wonder C．continue D．fail参考答案：A2. At the conference, Chairman Hu referred to a great many topics, education_____A. in detailB. in chargeC. in particularD. in order参考答案：C略3. Cherry, a car maker in Anhu i Province, sold nearly 700.000 units in 2011, with the total value _____ it was in 2005.A. more than three times whatB. three more times than thatC. over three times than whatD. over three times of that参考答案：A略4. Hardly had the employees ________ with their work when the rain stopped.A. passed onB. focused onC. depended onD. carried on参考答案：D略5. The Greens must have been to 2010 Shanghai Expo, ______they?A. hadn’tB. didn’tC.can’t D. weren’t 参考答案：D考查反意疑问句。

2020年合肥市第三十八中学高三英语期中考试试卷及答案解析第一部分阅读（共两节，满分40分）第一节（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、D四个选项中选出最佳选项AAre you looking for somewhere special to go this weekend? Do you want to try something new?Check out one of these hot new restaurants.Fast BestFast food doesn't have to be junk food, as this café proves. Do you fancy a really good hamburger made with the best ingredients, or old-fashioned fish and chips fried to perfection, all on the table in super-quick time? Speed and quality are important here, and the prices aren't bad either.Your Local Caff (小餐馆)Remember when cafés served full English breakfasts—sausages, beans, fried bread, bacon and eggs—with a strong cup of tea? Well, this place still does and you can have your breakfast at any time you like during the day while you listen to your favourite tunes from the 1980s.Last Days of the RajA centrally located Indian restaurant, perfect for eating before or after the cinema or a show. In summer enjoy your meal in the beautiful garden. The most popular dishes are lamb and chicken cooked with mild, medium or hot spices. For brave customers there is extra hot!The Chocolate BoxThe owner of this small café used to cook all kinds of food, but then she realised she preferred desserts to anything else. If you want meat or fish, don't come here. They only do desserts! Lots of different kinds of sweets. Chocolate lovers will be excited by the range of chocolate cakes.1.Fast Best suits a person ______.A.who has a sweet toothB.who loves spicy foodC.who wants to have good breakfastD.who gets 30 minutes off for lunch2.Which is true about Last Days of the Raj?A.You can listen to great music in it.B.It serves hot food with pepper.C.It serves an all-day breakfast.D.It is prefect for vegetarians.3.Which restaurant serves only desserts and sweets?A.Fast Best.B.Your Local Caff.st Days of the Raj.D.The Chocolate Box.BI got my first bike when I was nine years old. Jimmy, the bike, was my first love. I rode it everywhere. The suburb, the back lanes, the fields and forests, the river paths and swampland were far more exciting than any adventure novel or television series.There’s nothing quite like the relationship between a child and his bicycle and the endless happiness two wheels and a pair of strong legs offer. No video or computer game can replace the liberation of being alone on a bicycle.As parents, to deny children the simple pleasure of riding a bike is a failure of our responsibilities to raise independent and stable young citizens. We should offer our children a healthy alternative to hours in front of an addictive screen. Studies have shown that cycling promotes not only muscle growth but brain growth. Guess which country has children with the best mental health outcomes and is regularly the top of listings of the happiest young people. No surprise it’s theNetherlands, the unquestioned leader among industrial countries in encouraging bicycle use.Our dependence on cars has degraded the public transport system, polluted our sky, led to the untimely death of thousands every year, and denied children safe access to their suburbs. A recent study found that 69% of children were accompanied to school. The same study found that a similar number of parents drove to work.In some regions ofJapan, when children start their first year of school, parents are expected to walk with them for the first few weeks, introducing them to residents and shopkeepers along the chosen route, letting the community take care of these children. However, driving children to school isproscribed. Children can choose to ride a bike or walk to school after they are familiar with the community, and it’s the community’s role to keep them safe.Therefore, I strongly advise the government to provide better infrastructure (基础设施). Build separated cycle lanes, decrease speed limits, and design street scapes that favour people over cars. The results will be less pollution, quieter suburbs, a healthier population and, best of all, happy and independent children.4. What can we infer about the author from the text?A. He was addicted to computer games.B. He liked taking adventurous trips in nature.C. He had great fun exploring the outside by cycling.D.He got his first birthday present at the age of nine.5. Why does the author mention theNetherlandsin Paragraph 3?A. To introduce his good way of raising independent children.B. To illustrate the great influence riding has on mental health.C. To stress the importance of being physically and mentally healthy.D. To explain cycling does best in city development in theNetherlands.6. What does the underlined word “proscribed” in Paragraph 5 probably mean?A. Recommended.B. Protected.C. Delayed.D. Forbidden.7. How does the author mainly support his idea?A. By analyzing causes.B. By listing examples.C.By giving definitions.D. By analyzing scientific data.CRecycling plastic has always been a stop-start effort, and the wide variety of plastics we produce, the pollution from waste, and other limitations make recycling an economic(经济) problem. It’s estimated(估计)only 9% of plastic ever created has been recycled. But with the help of a chemical process, Canadian Miranda Wang and her company BioCellection want to change that.Stability is one of plastic greatest qualities and downside. There's limited evidence that some plastics can biodegrade (生物降解)but largely photo-plastics degrade in the sun. It’s a long process, and the truth is that we can only estimate how long it takes. Wang is looking to break the inaction and BioCellection's task is to make most plastic waste recyclable.She outlines two current methods. One is to take plastics like water bottles, wash them, cut them, melt and reconstitute them. “That's a very limited process” she says, due to the requirement that plastics be “clean” . The other, which can handle dirtier plastics and a level of pollution, is called hydrolysis(热解). Intense heat is applied to break down plastics so they can be reused as oils for energy, but “it’s not economical,’’ she says.BioCellection’s solution builds on research from over ten years ago, Wang explains, when a US studydiscovered pure polyethylene powder (聚乙烯粉)could be broken down by a catalyst (催化剂). Wang and her co-founder Jean hit upon a bacterium being able to eat plastic. In the years since, they engineered a comparable catalyst capable of doing the same job, only faster, which even works on plastics no one else can recycle at present. “We have now found a catalyst that is much cheaper than the one that was used before, Wang says.Currently focusing on plastic films like shopping hags, the three-hour process breaks clown plastic into chemicals that can act as the building blocks for more complex plastic products.“Right now we’re able to achieve about 70% transformation from plastic waste material to these chemicals,” she adds, saying they’re working to increase that figure.8. Why has so little plastic been recycled?A. Plastic is chemically stable.B. Recycling plastic led to pollution.C. We produced various plastics.D. Most photo-plastics degrade in the sun.9. What does Wang think of the two current methods?A. Highly effective and dynamic.B. Expensive and pollution-causing.C. Limited and energy-consuming.D. Widely used and recognized.10. What did BioCellection find effective to recycle plastics?A. Polyethylene powder.B. Chemical products.C. Plastic films.D. A catalyst.11. What is the text mainly about?A. Miranda Wang and her company.B. A new plastic recycling method.C. The greatest downside of plastic.D. Transformation of plastic waste.DIn 2002, young Elon Musk tried unsuccessfully to buy Russian rockets to help him send mice to Mars and back. Afterwards, the youngmillionaire decided to build his own rockets.Musk went to Southern California and started hiring people to help bring his dream to life. In a very short time, and despite some failures, his company SpaceX launched Falcon 1, the first successful privately-built liquid fuel rocket, into Earth's orbit in 2008.As the first Falcon rocket began testing, development was already underway for the Falcon 9. This much larger rocket, which uses nine engines to lift heavy payloads（有效载荷）into orbit, is engineered to return to Earth, ready to be reused for another flight.For Musk, space is the final destination. To help people get there, his company Neuralink is developing devices that will link people's brains with computers. A similar device has been developed at the University of Utah. It consists of a chip（芯片）with 256 threads（线程）that is placed between a person's skin and brain. The threads attach directly to brain tissue（脑组织）.Patients who have the device are able to use only their minds to communicate with one another through computers.Neuralink's chips will have about 1,000 threads. A robot developed by the company will place up to ten chips under a person's skin. The chips will communicate without wires but with a tiny device that will be worn behind the person's ear. That device, in turn, will communicate with computers. The primary market for the technology will be for people that, because of injuries or birth defects, cannot control their hands and arms. With Neuralink^ product, they'll be able to mentally command a computer to type messages for them or carry out other tasks.12. According to this article, what was the first Falcon 1 able to do?A. Launch big satellites.B. Reach distant moons.C. Move around our planet.D. Study the universe.13. What does the article explain about Neuralink's chips?A. How they'll be set up.B. What safety features they'll have.C. How much money they'll earn.D. Where they'll be produced.14. According to this article, who is Neuralink going to market its product to first?A. Those who own great wealth.B. Those who are physically disabled.C. Those who travel internationally.D. Those who do research on plants.15. In which publication is this article most likely to appear?A. The Journal of Environmental Studies.B. Advances in Business and Technology.C. Digest of Fashion and Entertainment News,D. Consumer's Guide to Outdoor Recreation.第二节（共5小题；每小题2分，满分10分）阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。

合肥市普通高中六校联盟2024届高三第一学期期末联考英语试卷（答案在最后）(考试时间：120分钟满分:150分)第一部分听力(共两节，满分30分)做题时,先将答案标在试卷上。

录音内容结束后,你将有两分钟的时间将试卷上的答案转涂到答题卡上。

第一节(共5小题;每小题1.5分，满分7.5分)听下面5段对话。

每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。

听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。

每段对话仅读一遍。

1.Where did the man go yesterday?A.To a museum.B.To a library.C.To a tennis court.2.Who is the woman talking to?A.Her son.B.A neighbor.C.A deliveryman.3.Why is George late?A.He missed the bus.B.His bike broke down.C.He had to change clothes.4.How did the man feel after watching the video?A.Moved.B.Excited.C.Surprised.5.What’s the matter with Laura?A.She broke the printing machine.B.She pressed the wrong button.C.She is under work pressure.第二节(共15小题;每小题1.5分，满分22.5分)听下面5段对话或独白。

每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。

听每段对话或独白前，你将有时间阅读各个小题，每小题5秒钟;听完后，各小题将给出5秒钟的作答时间。

合肥一中2023届高三最后一卷英语参考答案第一部分听力(共两节，满分30分)1-5. BCBCA 6-10. BACCA11-15. CABCB 16-20. BCBAA第二部分阅读（共两节，满分50分）第一节（共15小题；每小题2.5分，满分37.5分）21-25. DCDDA 26-30. BACDC 31-35. BBCAB第二节（共5小题;每小题2.5分，满分12.5分）36-40. GBEFD第三部分语言运用（共两节，满分30分）第一节(共15小题；每小题1分，满分15分)41-45. CABAD 46-50. CBDAB 51-55. CBACD第二节（共10小题；每小题1.5分, 满分15分）56. was staged 57. tickets 58. When 59. paid 60. a61. traditional 62. to explore 63. has built 64. who 65. with第四部分写作（共两节，满分40分）第一节(满分15分)略第二节(满分25分)略部分答案详解：A篇【导语】语篇类型：应用文主题语境：人与社会文章呈现了四部电影的网络评语。

21.D. 细节理解题。

根据题干“ a natural disaster”定位到All That Breathes一节中第一句“Thecarefully-made documentary All That Breathes is set in the climate catastrophe of the failing river and crowded neighborhoods of New Delhi.” 可得答案为D。

22.C. 细节理解题。

根据题干定位到Guillermo del Toro’s Pinocchio和Abbott Elementary两节，在这两节的最后都有“— Aisha Harris”字样，说明两段评语为同一人所写，可得答案为C。

2024学年安徽省合肥市庐阳区第一中学高三模拟卷(一)英语试题试卷注意事项：1．答卷前，考生务必将自己的姓名、准考证号填写在答题卡上。

2．回答选择题时，选出每小题答案后，用铅笔把答题卡上对应题目的答案标号涂黑，如需改动，用橡皮擦干净后，再选涂其它答案标号。

回答非选择题时，将答案写在答题卡上，写在本试卷上无效。

3．考试结束后，将本试卷和答题卡一并交回。

第一部分（共20小题，每小题1.5分，满分30分）1．We’ll build a power station ______ water reso urces are plentiful.A．where B．in whichC．which D．that2．The cost of living in big cities ________ steadily for many years，and it has led some youths to drop out of the big city race.A．is climbing B．is being climbedC．has been climbing D．has been climbed3．The fellow we spoke ________ no comment at first.A．to make B．to madeC．made D．to making4．-Excuse me, but why am I not allowed to use the gym?-________，but your room price doesn't cover it.A．No hurry B．No wonder C．No offence D．No problem5．The Oxford English Dictionary is necessary for learning English，so you'd better buy __________．A．this B．that C．it D．one6．The foreigners here are greatly impressed by the fact that _______ people from all walks of life are working hard for ________ new Tianjin.A．/; a B．/; theC．a; a D．the; the7．Most spending that results in debt is like a drug: a quick hit of pleasure that ______, only to drag you down for years to come.A．takes off B．wears off C．sets off D．shows off8．But for your help, I __________ the work on time. I really do not know how I can thank you enough.A．wouldn't finish B．hadn't finishedC．wouldn't have finished D．won't have finished9．The national park has a large collection of wildlife, ________ from butterflies to elephants.A．to range B．rangeC．ranging D．ranged10．Children who are not active or_____ diet is high in fat will gain weight quickly.A．what B．whoseC．which D．that11．It is well known _____Confucius was born in the city of Qufu in Shandong province, China. A．whether B．whereC．that D．what12．Mary seems ________ the bad news, for she looks nice and happy.A．not to have learned B．not to be hearingC．not having learned D．not to be heard13．I thought it hard to complete the project at first, but I______my mind.A．change B．have changedC．had changed D．would change14．He wrote a letter ________ he explained what had happened in the accident.A．that B．whichC．where D．what15．—Ken, ________, but your radio is going too loud.—Oh, I’m sorry. I’ll turn it down right now.A．I hate to say it B．It doesn’t hurt to askC．I’ m really tired of it D．I’m crazy about it16．— Sorry, sir. I ______ follow you. Would you please speak slower?— Ok.A．can’t B．mustn’t C．shouldn’t D．needn’t17．These diagrams are especially helpful when we have a concrete problem ______ at hand. A．be solved B．to solve C．solved D．being solved18．Sometimes, the kind of food we serve a person suggests ________ we show our gratitude. A．when B．whatC．why D．how19．---Will you be_____________ this evening，Mary？---That depends. I am afraid I will be with my manager，discussing a plan.A．convenient B．suitableC．available D．efficient20．-- I have heard Mr. Morgan will be here at 4:00 pm. next Thursday.-- No, he _______ at that time.A．was boarding B．would be boardingC．will be boarding D．is boarding第二部分阅读理解（满分40分）阅读下列短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。

安徽省合肥市2024年高三第三次教学质量检测语文试题留意事项：1．答题前，务必在答题卡和答题卷规定的地方填写自己的姓名、准考证号和座位号后两位。

2．答题时，每小题选出答案后，用2B铅笔把答题卡上对应题目的答案标号涂黑。

如需改动，用橡皮擦干净后，再选涂其他答案标号。

3．答题时，必需运用0.5毫米的黑色墨水签字笔在答题卷上书写，要求字体工整、笔迹清晰。

作图题可先用铅笔在答题卷规定的位置绘出，确认后再用0.5毫米的黑色墨水签字笔描清晰。

必需在题号所指示的答题区域作答，超出答题区域书写的答案无效，在试题卷、草稿纸上答题无效。

4．考试结束，务必将答题卡和答题卷一并上交。

一、现代文阅读（35分）（一）论述类文本阅读（本题共3小题，9分）阅读下面的文字，完成1～3题。

20世纪的中国文学，基本是在作为一个框架的“中国”内部绽开，是对这个框架内部的个人或群体的书写，而此框架本身并未成为作家们自觉描写的对象。

“中国”可以表现为人，可以表现为山川大地，可以表现为宽阔的疆土，也可以表现为悠久的历史。

但综合来看，对于“中国”的书写表现动身散性的特点，“中国”基本并未作为一个融贯的理念，更很少作为一个文明体得到呈现。

当下中国所处的历史方位被命名为“新时代”，这一命名具有深远的文明史意义。

而作为创建新文明之主体的“中国”，将越来越显明地成为一个意蕴深远的理论概念，成为我们向远方远眺的基本视野。

由这种视野动身的新时代文学，也将具有越来越显明的纵深感，并最终在客观上将自身发展成为表现新时代之本质性和整体性的史诗。

“新时代”具有深远的文明史意义，这并不是说当中国进入新时代后，就化解了全部的冲突和问题，以一种文明的完成时态而存在。

新时代对新文明的创建是一个正在绽开的过程，这个未有穷期的动态过程包含一种内在的张力，即它一方面在本质上表现为批判、推动现有文明进程的创建性和超越性，另一方面又在具体的现实问题上表现出一系列冲突。

立足于现实中的各种冲突和问题来绽开文学世界，这是20世纪中国文学的传统，也是当下文学的基本特点。

2020-2021学年安徽省合肥市含山中学高三英语联考试题含解析一、选择题1. I saw a woman running toward me in the dark. Before I could recognize who she was, she had run back in the direction ____ she had come.A. of whichB. from whereC. in whichD. from which参考答案：D2. Grace doesn’t want to move to New York because she thinks if she there, she wouldn’t be able to see her parents very often.A. livesB. would liveC. having askedD. were live参考答案：D略3. Luckily the man missed the high-speed train to Wenzhou，or the have been killed in the accident．A．must B．would C．should D．might参考答案：D4. He is quite strange, for everything he does is opposite to _____ is considered normal behavior.A. whetherB. thatC. whatD. which参考答案：C5. Always remember to get every bit of criticism between two thick layers of praise.A. sandwichingB. being sandwichedC. having been sandwichedD. sandwiched 参考答案：D6. we want to get to Chicago by sunset, it means having to leave at dawn tomorrow.A. IfB. AfterC. WhileD. Where参考答案：A7. ________ anything like this style of architecture before, we thought we were looking at giant sculptures, not buildings.A. We had never seenB. Never having seenC. Never being seenD. Never had we seen参考答案：B考查分词做状语。

合肥市2020年高三第三次教学质量检测英语试题（考试时间120分钟满分：150分）试卷采用闭卷、笔试形式。

试卷由四个部分组成。

其中，第一、二部分和第三部分的第一节为选择题。

第三部分的第二节和第四部分为非选择题。

试卷满分150分。

考试时间120分钟。

考试结束后，将本试卷和答题卡一并交回。

注意事项：1.答卷前，考生务必用0.5毫米黑色签字笔将自己的姓名、座位号、准考证号、县区和科类填写在答题卡和试卷规定的位置上。

2.回答选择题时，选出每小题答案后，用2B铅笔把答题卡上对应题目的答案标号涂黑。

如需改动，用橡皮擦干净后，再选涂其它答案标号。

3.回答非选择题时，必须用0.5毫米黑色签字笔作答，答案必须写在答题卡各题目指定区域内相应的位置，写在本试卷上无效。

如需改动，先划掉原来的答案，然后再写上新的答案；不能使用涂改液、胶带纸、修正带。

不按以上要求作答的答案无效。

第一部分听力（共两节，满分30分）做题时，先将答案标在试卷上。

录音内容结束后，你将有两分钟的时间将试卷上的答案转涂到答题卡上。

第一节（共5小题；每小题1.5分，满分7.5分）听下面5段对话。

每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项。

听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。

每段对话仅读一遍。

1. What is the man doing?A. Asking for information.B. Offering suggestions.C. Talking about the traffic.2. How does the man feel about the change?A. Satisfied.B. Shocked.C. Disappointed.3. What are the speakers talking about?A. Getting Zoe a gift.B. Having a birthday party.C. Making a weekend plan.4. Where does the conversation probably take place?A. In an office.B. In a gallery.C. In a restaurant.5. Why does the man seek a new job?A. To earn more money.B. To have better colleagues.C. To get promotion opportunities.第二节（共15小题；每小题1.5分，满分22.5分）听下面5段对话或独白。

合肥市2020年高三第三次教学质量检测数学试题（理科）（考试时间:120分钟 满分:150 分）注意事项:1．答题前，务必在答题卡和答题卷规定的地方填写自己的姓名、准考证号和座位号后两位．2．答第Ⅰ卷时，每小题选出答案后，用2B 铅笔把答题卡上对应题目的答案标号涂黑．如需改动，用橡皮擦干净后，再选涂其他答案标号．3．答第Ⅱ卷时，必须使用0.5毫米的黑色墨水签字笔在答题卷上书写，要求字体工整、笔迹清晰．作图题可先用铅笔在答题卷规定的位置绘出，确认后再用0．5毫米的黑色墨水签字笔描清楚。

必须在题号所指示的答题区域作答，超出答题区域书写的答案无效，在试题卷、草稿纸上答题无效．第Ⅰ卷（满分60分）一、选择题：本大题共12小题，每小题5分，满分60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R 为实数集，集合{}20<<=x x A ，{}3<=x x B 则B A C R I )(=A ．{}32<<x xB ．{}32<≤x xC ．{}320<≤<x x x 或D ．{}320<≤≤x x x 或2．若复数21,z z 在复平面内对应的点关于原点对称，i z +=11，则21z z ⋅=A ．2-B ．i 2-C ．2D ．i 23．某居委会从辖区内A ，B ，C 三个小区志愿者中各选取2人，随机安排到这三个小区，协助小区保安做好管理和宣传工作．若每个小区安排2人，则每位志愿者不安排在自已居住小区，且每个小区安排的志愿者来自不同小区的概率为A ．95B ．94C ．454D ．1352 4．已知双曲线)0(12222>>=-b a b y a x 的顶点到渐近线的距离为2a ，则该双曲线的离心率为 A ．32 B ．2 C ．23 D ．332 5．“关于x 的方程x x a 2)12(=+有实数解”的一个充分不必要条件是A ．131<<aB ．21≥aC ．132<<aD ．121<≤a 6．已知23)3tan(=+πα，则ααααsin cos 3cos sin 3-+= A ．91 B ．93 C ．31 D ．33 7．公元前1650年的埃及莱因德纸草书上载有如下问题:“十人分十斗玉米，从第二人开始，各人所得依次比前人少八分之一，问每人各得玉米多少斗?”在上述问题中，第一人分得玉米A ．18870109-⨯斗B ．10101078810-⨯斗C ．1010978810-⨯斗D ．1010878810-⨯斗 8．已知△ABC 三个内角A ，B ，C 的对边分别为a ，b ，c ．若B c b a cos 2=+，则2)(bc a b +的最小值为 A ．22 B ．3 C ．32 D ．49．某校高一年级研究性学习小组利用激光多普勒测速仪实地测量复兴号高铁在某时刻的速度，该激光测速仪工作原理是：激光器发出的光平均分成两束后射出，并在被测物体表面汇聚，探测器接收反射光，当被测物体横向速度为零时，反射光与探测光频率相同；当横向速度不为零时，反射光相对探测光会发生频移λϕsin 2v f p =，其中v 为测速仪测得被测物体的横向速度，入为激光波长，ϕ为两束探测光线夹角的一半，如图．若该激光测速仪安装在距离高铁1m 处，发出的激光波长为1550nm （1nm=9-10m ） ，测得某时刻频移为）（h /110030.99⨯，则该时刻高铁的速度约等于A ．h km /320B ．h km /330C ．h km /340D ．h km /35010．在长方体1111D C B A ABCD -中，AB=AD=6，AA 1=2，M 为棱BC 的中点，动点P 满足∠APD=∠CPM ，则点P 的轨迹与长方体的面DCC 1D 1的交线长等于A ．32πB ．πC ．34π D ．π2 11．已知不等式)]1ln([1+->--x x m x e x 对一切正数x 都成立，则实数m 的取值范围是A ．]3,(e -∞B ．]2,(e -∞ C ．]1,(-∞ D ．],(e -∞12．在矩形ABCD 中，AB=4，BC=34，点G ，H 分别是直线BC ，CD 上的动点，AH 交DG 于点P ．若）（，10212<<==λλλCB CG DC DH ，矩形ABCD 的对称中心M 关于直线AD 的对称点是N ，则△PMN 的周长为A ．12B ．16C ．λ24D ．λ32第Ⅱ卷（非选择题 共90分）本卷包括必考题和选考题两部分，第13题—第21题为必考题，每个试题考生都必须作第22题、第23题为选考题，考生根据要求作答．二、填空题：本大题共4小题，每小题5分，满分20分．把答案填在答题卡上的相应位置．13．某高中各年级男女生人数统计如下表:性别人数年级高一 高二 高三男生592 563 520 女生 528 517 a 按年级分层抽样，若抽取该校学生80人中，高二学生有27人，则上表中a= .14．5)44(x x +-的展开式中2x 的系数为 .15．已知数列{}n a 中n a n =．数列{}n b 的前n 项和12-=n n S ．若数列⎭⎬⎫⎩⎨⎧n n b a 的前n 项和M T n <对于*N n ∈∀都成立，则实数M 的最小值等于 .16．已知三棱锥A —BCD 的三条侧棱AB ，AC ，AD 两两垂直．其长度分别为a ，b ，c ．点A 在底面BCD 内的射影为O ，点A ，B ，C ，D 所对面的面积分别为S A ，S B ，S C ，S D ，在下列所给的命题中，正确的有 （请写出所有正确命题的编号）。