拉萨市2020届高三第二次模拟考试试卷

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2020年西藏自治区拉萨中学高三语文二模试题及答案

2020年西藏自治区拉萨中学高三语文二模试题及答案

2020年西藏自治区拉萨中学高三语文二模试题及答案一、现代文阅读(36分)(一)现代文阅读I(9分)阅读下面的文字,完成下列小题。

材料一:2018年7月15日国家食药监总局公告称,在飞行检查中发现长春长生生物公司的冻干人用狂犬病疫苗生产存在记录造假等严重问题。

疫苗事件引发了极大关注,但疫苗真假的定义并没有明确的界定。

事实上,多位业内人士表示,更改了生产参数的疫苗、效价不合格的疫苗并不等同于假疫苗或者“毒”疫苗。

某药物研发平台创始人兼CEO张清(化名)介绍,通常提到的假疫苗有两种,一种是疫苗上市之前研发数据错误导致疫苗为假,另一种是生产过程中导致的,具体来说有原料选用与生产流程问题,原料选取的优劣和生产过程是否规范直接影响质量,长春长生的假疫苗就是生产流程中更改了参数导致的问题。

某疫苗研发公司李强(化名)表示,“此次出事的狂犬疫苗是长春长生生物更改了生产参数,但更改了哪些,之后质量是否受到影响目前尚未公布,严格意义上也不能定性为假疫苗,但是企业不严格按照生产标准来生产疫苗肯定是违法的,应该受到严惩。

”《新京报·为什么疫苗容易出问题?》材料二:2013-2030 年全球疫苗行业市场规模变化趋势及预测全球市场情况数据搜狐网《疫苗行业深度研究分析》材料三:北京协和医学院基础医学院教授许雪梅在接受《生命时报》记者采访时说,包括天花、白喉、脊髓灰质炎、狂犬病、流行性乙型脑炎等在内的大部分病疫的控制或消除,都是因为疫苗起了作用。

特别是对新冠肺炎这种传播性强的疾病来说,疫苗研发更是必须的。

我们谁也不能保证,新冠肺炎未来不会成为流感样常态化传染病,如果能够研制出特效疫苗,就如同为人体增加了一道屏障,这是最理想的控制传染病疫情的方法。

一般来说,疫苗分为减毒活疫苗、灭活疫苗、亚单位疫苗、重组微生物载体疫苗、核酸疫苗等类型。

不同类型疫苗的研发手段略有不同,有些需要分离选取合适的病毒毒株,有些是选取病毒里面能够制造疫苗的关键蛋白或是基因序列,在实验研究筛选获得候选疫苗后,再进行深入的开发研究。

2020届西藏自治区拉萨中学高三英语二模试题及答案

2020届西藏自治区拉萨中学高三英语二模试题及答案

2020届西藏自治区拉萨中学高三英语二模试题及答案第一部分阅读(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AMarch means spring inSt. Louis. The city hosts plenty of events — both indoor and outdoor — that make March a perfect crowd-free month to visit. You may even want to plan your trip around it.See the Butterflies at Morpho Mardi GrasPHONE +1314-577-0888In the Butterfly House inFaustPark, thousands of bright blue butterflies are on display. These butterflies — types found mostly in South America, Mexico, and Central America — include over 29 different species and 147 subspecies(亚种), making the venue a wonderful place for kids, as they can learn about the critical role butterflies play in nature.Enjoy March Madness with Arch MadnessPHONE +1314-622-5400March is the best time of the year for basketball fans. The action inSt. Louisbegins with March Madness, the Missouri Valley Conference Tournament. Games take place during the first week in March at theScottradeCenter.Catch a Fabulous Fox Theatre Broadway ShowPHONE +1314-534-1111Each month, the Fabulous Fox Theatre hosts a variety of touring Broadway shows. And while tickets are slightly cheaper than that inNew York City, the quality of the performances doesn’t lack one bit. Check the schedule and buy tickets ahead of time, as the shows generally fill the venue.Celebrate World Eagle Day at the World Bird SanctuaryPHONE +1636-225-4390World Eagle Day is celebrated with live eagle presentations, educational activities and games. Learn aboutAmerica’s national symbol, as well as other foreign species. Get your photo taken with your favorite bird or adopt an eagle.1. Which of the following is attractive to kids?A. Seeing the Butterflies at Morpho Mardi Gras.B. Enjoying March Madness with Arch Madness.C. Catching a Fabulous Fox Theatre Broadway Show.D. Celebrating World Eagle Day at the World Bird Sanctuary.2. If you are a basketball fan, you can call________.A. +1314-577-0888B. +1314-622-5400C. +1314-534-1111D. +1636-225-43903. Why does the author recommend the Fabulous Fox Theatre?A. It is one of the branches of Broadway.B. It isnot far away fromNew York City.C. It doesn't charge the audience for tickets.D. It provides wonderful shows with cheaper tickets.BWhy doesHaitiso tend to have fatal earthquakes? Earthquakes have been causing huge damage inHaitisince at least the 18th century. The capital city has been destroyed twice in 19 years. The 21st century has beenno more kind.The Earth’s outer shell is made tip of tectonic plates (构造板块) that move.Haitisits near the crossing of two tectonic plaits that make up the Earth’s outer shell. Earthquakes can occur when those plates move against each other and create friction (摩擦力).Haitiis also overpopulated. Plus, many of its buildings are designed to resist hurricanes but not earthquakes. Those buildings can survive strong winds bat are easy to fail down when the ground shrikes. Poor building practices can also play arole.“I think it’s important to recognize that there’s no such thing as a natural disaster,” said Wendy Bohon, a geologist. “What you have is a natural disaster that comes with a weak architecture system. We do know that earthquakes like this can cause huge damage because ofthefault,” said Wendy. “And it’s quite a significant risk in places that don’t have the construction practices to resist the shaking.”Construction of more earthquake-resistant buildings remains a challenge inHaiti, which is the poorest nation in theWestern Hemisphere. “While there have been some success stories of Haitians building more earthquake-resistant structures, the country has lacked a centralized effort to do so,” said Mark Schuller, a professor of anthropology and nonprofit and NGO studies atNorthernIllinoisUniversity.Haiti’s government has become increasingly weak, while non-governmental organizations only focus on their own projects.“There is technical knowledge inHaiti, There are trained architects. There are cityplanners. That’s not theproblem,” Schuller said. “The problem is a lack of funding for coordination (协调), and lack of political will from donors to organizations providing aid.”4. Which factor causing the huge damage is highlighted?A. Its overpopulation.B. Its weak government.C. Its geographical location.D. Its weak architecture system.5. What does the underlined part “the fault” in paragraph 4 refer to?A Lacking political will to provide aid.B. Lacking hurricane-resistant; buildings.C. Lacking earthquake-resistant buildings.D. Sitting on the crossing of two tectonic plates.6. What’s Schuller’s attitude towardsHaiti’s government?A Supportive. B. Critical.C. Indifferent.D. Interested.7. Which of the following can be a problem according tothe last paragraph?A. Fund and will.B. Skilled architects.C. Urban designers.D. Technology and money.CThe regular world presented to us by our five senses — you could call it reality 1.0 — is not always the most user-friendly. We get lost in unfamiliar cities; we meet people whose language we don’t understand. So why not try the improved version: augmented reality(AR)or reality 2.0 ? AR technology adds computer-produced images on the real world via a mobile phone camera or special video glasses.Early forms of AR are already here — smart phones can deliver information about nearby ATMs and restaurants and other points of interest. But that’s just the beginning. A few years from now the quantity of information available will have increased hugely. You will not only see that there’s a Chinese restaurant on the next block, but you will be able to see the menu and read reviews of it.This is where the next revolution in computing will take place: in the interface(界面)between the real world and the information brought to us via the Internet. Imagine bubbles floating before your eyes, filled with cool information about anything and everything that you see in front of you.Let’s jump ahead to ten years from now. A person trying to fix a car won’t be reading a book with pictures; he will be wearing a device that projects animated 3D computer graphics onto the equipment under repair, labellingparts and giving step-by-step guidance.The window onto the AR world can be a smart phone or special video glasses. But in ten years’ time these will have been replaced by contact lenses(隐形眼镜) with tiny LEDs, which present something at a readable distance in front of eyes. So a deaf person wearing these lenses will be able to see what people are saying.The question is, while we are all absorbed in our new augmented reality world, how willwe be communicating with each other?8. What is the text mainly about?A. The relationship between reality 1.0 and reality 2.0.B. Different forms of the AR technology.C. The next information technology revolution.D. The popularity of the AR technology.9. Which of the following will AR technology support according to the text?A. To pay for things online conveniently.B. To play online games merrily.C. To offer information efficiently.D. To communicate with others socially.10. What are Contact lenses with tiny LEDs used for?A. Show texts and images.B. Protect people’s eyes.C. Help deaf people communicate.D. Replace smart phone.11. What’s the author’s attitude towards the AR technology?A. Indifferent.B. Critical.C. Concerned.D. Favourable.DWhen you walk on a sandy beach, it takes more energy than striding down a sidewalk — because the weight of your body pushes into the sand. Turns out, the same thing is true for vehicles driving on roads. The weight of the vehicles creates a very shallow indentation (凹陷) in the pavement (路面) — and it makes it such that it’s continuously driving up a very shallow hill.Jeremy Gregory, a sustainability scientist at M.I.T. and histeam modeled how much energy could be saved — and green-house gases avoided — by simply stiffening (硬化) the nation’s roads and highways. And they found that stiffening 10 percent of the nation’s roads every year could prevent 440 megatons of carbon dioxide equivalent emissions over the next five decades — enough to offset half a percent of projected transportationsector emissions over that time period. To put those emissions savings into context — that amount is equivalent to how much CO2 you’d spare the planet by keeping a billion barrels of oil in the ground — or by growing seven billion trees — for a decade.The results are in the Transportation Research Record.As for how to stiffen roads? Gregory says you could mix small amounts of synthetic fibers orcarbon nanotubes into paving materials. Or you could pave with cement-based concrete, which is stiffer than asphalt (沥青).This system could also be a way to shave carbon emissions without some of the usual hurdles. Usually, when it comes to reducing emissions in the transportation sector, you’re talking about changing policies related to vehicles and also driver behavior, which involves millions and millions of people — as opposed to changing the way we design and maintain our pavements. That’s just on the order of thousands of people who are working in transportation agencies. And when it comes to retrofitting (翻新) our streets and highways —those agencies are where the rubber meets the road.12. Why does the author mention “walk on a sandy beach” in paragraph 1?A. To present a fact.B. To make a contrast.C. To explain a rule.D. To share an experience.13. What suggestion does the author give to reduce CO2 emissions?A. Hardening the road.B. Keeping oil in the ground.C. Growing trees for decades.D. Improving the transportation.14. What is the advantage of this suggestion?A. Gaining more support.B. Consuming less money.C. Involving more people.D. Facing fewer usual obstacles.15. What does the underlined part mean in the last paragraph?A.Those agencies are likely to make more rules.B. Those agencies will change some related policies.C. Those agenciesmight put more rubber tires on the roads.D. Those agencies will play a key role in making this happen.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。

西藏拉萨市2020届高三第二次模拟考试语文试题(含答案)

西藏拉萨市2020届高三第二次模拟考试语文试题(含答案)

绝密★启用前姓名_______________准考证号码_____________拉萨市2020届高三第二次模拟考试试卷语文注意事项: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.作答时,务必将答案写在答题卡上。

写在本试卷及草稿纸上无效。

3.考试结束后,将本试卷和答题卡一并交回。

一、现代文阅读(36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。

有趣,和枯燥、乏味相对,是一个人身上闪闪发光的品质,是平淡生活里的“调味剂”。

说一个人有趣,是很高的评价。

那么,何为有趣?明人袁宏道说,“世人所难得者唯趣。

趣如山上之色、水中之味、花中之光、女中之态,虽善说者不能下一语,唯会心者知之。

”对“什么是趣”,古今中外,尚无定论,只能见仁见智。

在文人墨客笔下,人有人趣,物有物趣,自然景物有天趣。

趣者,存乎一心,大凡让人心生快意、心旷神怡的,都莫不有趣。

有趣的人,对生活抱有大爱。

有时,即便身处逆境,他们也能过得兴致盎然;即便眼前满是苟且,他们也总能找到诗和远方。

苏轼就是个十足有趣的人。

被贬官后,他没有愁肠百结,而是发现了生活的真和趣。

在黄州,他把“价钱如泥土”“贵者不肯吃,贫者不解煮”的猪肉,做成了色、香、味俱全的“东坡肉”,并撰文《猪肉颂》,讲述烧制心得。

有趣的人,有着强烈的好奇心。

因为万般好奇,凡事都想探个究竟、弄个明白,自然就能找到常人一般难以发现的趣和乐。

清人沈复在《浮生六记》中写道:“余忆童稚时,能张目对日,明察秋毫。

见藐小微物,必细察其纹理,故时有物外之趣。

”他笔下的文字也是妙趣横生,比如,“一日,见二虫斗草间,观之正浓,忽有庞然大物拔山倒树而来,盖一癞虾蟆也,舌一吐而二虫尽为所吞。

余年幼,方出神,不觉呀然惊恐。

神定,捉虾蟆,鞭数十,驱之别院。

”如此趣味盎然的文字,若非有趣之人,肯定抓耳挠腮、冥思苦想也写不出来。

有趣的人,深藏大智慧。

要从平淡的日子中咂摸出趣味,离不开对生活的敏锐洞察,对人情世故的深刻洞悉,对知识阅历的深厚积淀。

2020届西藏自治区拉萨中学高三英语二模试题及答案

2020届西藏自治区拉萨中学高三英语二模试题及答案

2020届西藏自治区拉萨中学高三英语二模试题及答案第一部分阅读(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ASan Francisco Bay Area is a great place if you're a sports fan as you'll find several events all year round and plenty of team pride. If you are anywhere close to the area during a game,these fantastic sports events are here for you.San Francisco Giants BaseballThe San Francisco Giants baseball team plays in SF at Oracle Park. This is a fun ballpark because it's always packed with great energy and offers views of the bay. It's one of the most popular San Francisco sports events. The Giants are part of the National League West Division. Since their arrival here in 1958,they have been World Series Champions three times.Golden State Warriors BasketballThe fan base of the Golden State Warriors distributes the whole San Francisco Bay Area as this region's only NBA team.Their regular season runs from late October through mid-April, and all home games are played at the Chase Center in San Francisco.In total, the Warriors has won six NBA championships.San Francisco 49ers FootballThe 49ers are San Francisco's NFL team, though they have recently moved to Levi's Stadium in Santa Clara, about an hour south of SF. The football team was named for the prospectors (探矿者) who arrived in the area in 1849 for the Gold Rush. They’ve won 5 Super Bowl championships, all between 1981 and 1994.San Jose Sharks HockeyThe San Jose Sharks represent the Bay Area in hockey (冰球).They were founded in 1991 as the only Bay Area team to compete in the NHL. Sharks fans love going to these San Francisco sports events at the SAP Center,which they call the Shark Tank,located about an hour southeast of SF.1.Where can a sports fan have a good view of the area?A.The Oracle Park.B.The Chase Center.C.Levi's Stadium.D.The SAP Center2.Which team has claimed the most titles according to the text?A.The Giants.B.The Golden State Warriors.C.The 49ers.D.The San Jose Sharks.3.Where is the passage probably taken from?A.A book review.B.A news report.C.A science fiction.D.A tourist magazine.BHave you ever noticed that some people can eat what they want and stay in shape, while others carefully watch what they eat and still put on weight? How annoying! However, scientists are beginning to believe that some people get the ability to stay thin from their parents.Scientists say that when some people eat, their bodies will naturally store the excess energy from food as fat. These people gain weight if they eat more than they need each day. Meanwhile, other people eat more than they need but their bodies are able to “burn off” the extra food without making fat, so they rarely have weight problems.To show that this is true, scientists have experimented on laboratory mice. They gave the mice a special diet with a lot of fat. Some mice gained weight while the other mice stayed thin, even though both groups of mice ate the same amount of food and got the same amount of exercise. Scientists concluded that weight gain seemed to be influenced by genetic (基因的) factors. They also believe they have now identified the genes that may cause this tendency. These genes, according to the scientists, get passed down the generations. Armed with this knowledge, they believe it may be possible to develop medicines thatcan target the genes and stop people from gaining weight.The study of weight gain is becoming more important as the numbers of people who are overweight continues to grow. In theUnited States, over seventy percent of the population have weight problems. This means they are at risk of illness such as high blood pressure and heart disease.Current medicines for weight control do not work very well because they can have serious side effects, such as heart problems. However, it takes a long time to develop and thoroughly test new drugs. Therefore, despite this breakthrough in the study of weight-loss drugs, scientists and health professionals all agree that currently the best way to control weight gain is to have a healthy, balanced diet and an active lifestyle with daily exercise. This will not only help people avoid becoming overweight, but also help them stay healthy and energetic.4. According to the scientists, some people ________.A. are able to stay thin because of genetic factorsB. can eat what they want and stay healthy foreverC. usually keep doing exercise to lose their weightD. don’t eat anything every day but still put on weight5. Some people don’t need to worry about weight problems because ________.A. they eat many vegetablesB. they eat less than othersC. they don’t store any energy from food as fatD. they can burn off the extra food without making fat6. What can we learn from the passage?A. Fewer people will have weight problems in the future.B. People with weight problems may suffer from heart trouble.C. We now have good medicine for people with weight problems.D. The result of the experiments on mice and humans are different.7. What does the last paragraph imply?A. Current medicine solve weight problems well.B. We should exercise regularly and eat properly.C. Taking exercise every day may cause heart problems.D. Testing new drugs is hard because of the side effects.CPeggy Whitson's job demands a daily two­hour workout in a gym where weight has no meaning and the view changes at 17,000 miles an hour.Whitson makes it look easy. At 57, she is the oldest woman to fly in space, breaking the record last November, 2016, when she began her third long­term stay at the International Space Station. After returning home in September, 2017, the NASA astronaut feltmatter­-of­-factabout the age milestone.“It wasn't a record I was seeking for,” Whitson said. “I was 42 and 48 for my first two space flights. I feel lucky that I was able to get to do another one in my 50s. I don't think people should let age discourage them, even on those jobs that require some amount of physical fitness. The oldest man is John Glenn (at 77), and we've had male astronauts in their 60s before, so it's just a matter of time before women start flying in space at this age”.On the earth, she stays fit by weightlifting, biking, playing basketball and water skiing. She shared what it's like to live in microgravity: “It's like you're in a swimming pool, but you don't have to worry about breathing. If I push off from one side, I'm going to float to the other side. Every direction feels exactly the same, which is really hard foryour brain to grasp, but it's amazing how fast you adapt.It's a big shock for the body to come back to Earth—everything is so heavy. We spend a lot of time getting used to being back in gravity again. Back pain was really the most dramatic for me this time. For me, coming home is harder than going up into space.”8. How long did Peggy Whitson spend for her third stay in the International Space Station?A. About 300 days.B. About 708 days.C. About 107 days.D. About57 days.9. What does the underlined word probably mean in the passage?A. Amazing.B. Not surprising.C. Enthusiastic.D. Unbelievable.10. According to the passage, which of the following is true?A. Peggy Whitson likes swimming most.B. Peggy Whitson is the oldest person to fly in space.C. Peggy Whitson had been in space in 2002 and 2008.D. There had been female astronauts over 60s flying in space before.11. Which of the following will Peggy Whitson probably say?A. You can still be successful and do physical things when old.B. I spent quite a lot of time getting used to the life in space.C. The moment we reached the earth, we felt so relaxed.D. I feel lucky that I am physically well after the whole journey.DVolunteer DayWhat better way is there to enjoy your own hobbies while helping others at the same time? Come to Volunteer Day and choose which activity you’d like to join for the day. See below for a schedule of events on Volunteer Day.Volunteer Day schedule:7:30am.: Meet at the Community (社区) Center for juice and bagels.8:00—8:30 a.m.: Choose which activity you’d like to help with for the day.8:30 a.m.: Board the bus to your activity site.9:00 a.m.—3:30 p.m.: Work as a volunteer.3:30 p.m.: Board the bus that will take you back to the Community Center.See below for a list of volunteer opportunities for Volunteer Day so you can begin thinking about which activity you might want to join.A list of volunteer activities:Paint houses: Do you enjoy making art? If so, this volunteer opportunity might be just right for you! Happy Homes is a local organization that provides home repairs for needy people in the form of painting. For elderly or physically disabled people who cannot do repairs to their homes, Happy Homes provides volunteer painters to repaint old homes; outside or in. Happy Homes also provides painters to create beautiful wall paintings inside schools or community centers.Plant flowers: Do you enjoy being outside in nature? City Parks Association has many great opportunities for people who love to be outdoors. Help plant flowers and bushes in city parks; help lay paths at Cave Springs Park, or help pick up rubbish around the river banks. These activities are very active, so remember to be prepared with plenty of drinking water!Read to children: Do you enjoy working with young children? Do you like books? Love and Learning is an organization that provides volunteers to help children with learning disabilities. Read books out loud to groups of children four to six years old, or read one-on-one with struggling readers seven to eight years old.Play with animals: Do you love animals? Lovely Friends is an organization that visits local animal shelters and provides volunteers to spend time with the animals while their cages are being cleaned. Play with puppies, snuggle with cats, or hand-feed rabbits.12. At what time do volunteers leave for their activity sites?A. 7:30 a.m..B. 8:00 a.m.C. 8:30 a.m.D. 9:00 a.m.13. An outdoor lover probably takes part in ______.A. Plant flowersB. Paint housesC. Read to childrenD. Play with animals14. What do Lovely Friends volunteers do?A. Read books to children.B. Spend time with animals.C. Help plant bushes in parks.D. Pick up garbage along the river.15. The purpose of the passage is to _________.A. educate childrenB. attract volunteersC. comfort the elderlyD. encourage the disabled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。

2020年西藏拉萨市高考数学二模试卷(文科) (含解析)

2020年西藏拉萨市高考数学二模试卷(文科) (含解析)

2020年西藏拉萨市高考数学二模试卷(文科)一、选择题(本大题共12小题,共60.0分)1.在复平面内,复数2i1+i对应的点的坐标为()A. (1,1)B. (−l,1)C. (1,−l)D. (−1,−l)2.已知集合A={x|−1≤x≤2},B={1,2,3},则A∩B=()A. {1}B. {2}C. {1,2}D. {1,2,3}3.下列函数中,在区间(0,+∞)上单调递增的是()A. y=x12B. y=2−xC. y=log12x D. y=1x4.函数f(x)=√12−x−x2的定义域为()A. (−∞,−4]⋃[3,+∞)B. [−4,3]C. (−∞,−4)⋃(3,+∞)D. (−4,3)5.数列1,5,10,16,23,31,x,50,⋯中的x等于()A. 38B. 39C. 40D. 416.以(−1,0)为圆心,且和y轴相切的圆的方程是()A. (x+1)2+y2=4B. (x+1)2+y2=1C. (x−1)2+y2=4D. (x−1)2+y2=17.要得到y=sin(2x−π3)的图象,只要将y=sin2x的图象()A. 向左平移π3个单位 B. 向右平移π3个单位C. 向左平移π6个单位 D. 向右平移π6个单位8.若正整数N除以正整数m后的余数为n,则记为N=n(mod m),例如10=2(mod4),下面程序框图的算法源于我国古代闻名中外的《中国剩余定理》.执行该程序框图,则输出的i等于()A. 4B. 8C. 16D. 329.羽毛球混合双打比赛每队由一男一女两名运动员组成.某班级从3名男生A1,A2,A3和3名女生B1,B2,B3中各随机选出两名,把选出的4人随机分成两队进行羽毛球混合双打比赛,则A1和B1两人组成一队参加比赛的概率为()A. 19B. 29C. 13D. 4910.用一平面去截体积为4√3π的球,所得截面的面积为π,则球心到截面的距离为()A. 2B. √3C. √2D. 111.已知点A在抛物线y2=4x上,且点A到直线x−y−1=0的距离为√2,则点A的个数为()A. 1B. 2C. 3D. 412.已知S n是等差数列{a n}的前n项和,则“S n>na n对n≥2恒成立”是“a3>a4”的()A. 充分而不必要条件B. 必要而不充分条件C. 充分必要条件D. 既不充分也不必要条件二、填空题(本大题共4小题,共20.0分)13.已知双曲线x2a2−y2=1(a>0)的一条渐近线方程为y+2x=0,则a=______ .14.设a⃗=(2m+1,m),b⃗ =(1,m),且a⃗⊥b⃗ ,则m=______.15.在△ABC中,若a=4,b=2,cosA=−14,则c=______,sinC=______.16.已知f(x)是定义R上的奇函数,满足f(1−x)=f(1+x).若f(1)=2,则f(1)+f(2)+f(3)+⋅⋅⋅+f(2021)= _______.三、解答题(本大题共7小题,共82.0分)17.某企业质量检验员为了检测生产线上零件的情况,从生产线上随机抽取了80个零件进行测量,根据所测量的零件尺寸(单位:mm),得到如下的频率分布直方图:(1)根据频率分布直方图,求这80个零件尺寸的中位数(结果精确到0.01);(2)已知尺寸在[63.0,64.5)上的零件为一等品,否则为二等品.将这80个零件尺寸的样本频率视为概率,从生产线上随机抽取1个零件,试估计所抽取的零件是二等品的概率.18.设S n是数列{a n}的前n项和,且S n=2a n−1.(1)证明:数列{a n}是等比数列;(2)求数列{na n}的前n项和T n.19.如图,三棱锥P−ABC中,PB⊥底面ABC,∠BCA=90°,PB=BC=CA=2,E为PC的中点,点F在PA上,且2PF=FA.(1)求证:BE⊥平面PAC;(2)求点E到平面PBF的距离.20.已知函数f(x)=(x+2)e x.(1)求曲线y=f(x)在点(0,f(0))处的切线方程;(2)求f(x)的极小值.21. 已知椭圆的两个焦点分别为F 1(−1,0)、F 2(1,0),M 、N 为椭圆短轴的端点,P 为椭圆上异于M 、N 的点,直线PM 、PN 的斜率之积为−34.(1)求椭圆的标准方程;(2)过F 1,F 2分别作直线l 1与l 2,l 1交椭圆于A 、B 两点,l 2交椭圆于C 、D 两点,且l 1⊥l 2.求四边形ACBD 的面积S 的取值范围.22. (1)将参数方程转化为普通方程:{x =sinθ+cosθy =1+sin2θ(θ为参数).(2)求椭圆x 29+y 24=1的参数方程:①设x =3cosφ,φ为参数;②设y =2t ,t 为参数.23.某家用轿车的购车费9.5万元,保险费、保养费及换部分零件的费用合计每年平均4000元,每年行车里程按1万公里,前5年性能稳定,每年的油费5000元,由于磨损,从第6年开始,每年的油费以500元的速度增加,按这种标准,这种车开多少年报废比较合算?-------- 答案与解析 --------1.答案:A解析:解:2i1+i =2i(1−i)(1+i)(1−i)=2+2i2=1+i.所以复数2i1+i对应的点的坐标为(1,1).故选A.直接利用复数的除法运算化简,化为a+bi(a,b∈R)的形式后答案可求.本题考查了复数代数形式的乘除运算,考查了复数的几何意义,是基础题.2.答案:C解析:解:∵A={x|−1≤x≤2},B={1,2,3};∴A∩B={1,2}.故选:C.进行交集的运算即可.考查描述法、列举法的定义,以及交集的运算.3.答案:A解析:解:y=x12在(0,+∞)上单调递增,y=2−x,y=log12x和y=1x在(0,+∞)上都是减函数.故选:A.判断每个函数在(0,+∞)上的单调性即可.考查幂函数、指数函数、对数函数和反比例函数的单调性.4.答案:D解析:本题考查函数的定义域及其求法,是基础题.由分母中根式内部的代数式大于0,解不等式组答案.解:由12−x−x2>0,解得−4<x<3.∴函数f(x)的定义域为(−4,3).故选D.5.答案:C解析:5−1=4,10−5=5,16−10=6,23−16=7,31−23=8,∴x−31=9,∴x=40.6.答案:B解析:解:以(−1,0)为圆心,且和y轴相切的圆的半径为1,故它的方程为(x+1)2+y2=1,故选:B.先确定半径,再根据圆心坐标可得它的标准方程.本题主要考查求圆的标准方程,关键是确定圆心坐标和半径,属于基础题.7.答案:D解析:本题考查了函数y=Asin(ωx+φ)的图象与性质.利用函数y=Asin(ωx+φ)图象的平移变换得结论.解:将函数y=sin2x向右平移π6个单位,即可得到y=sin[2(x−π6)]的图象,就是y=sin(2x−π3)的图象.故选D.8.答案:C解析:解:模拟程序的运行,可得n=11,i=1i=2,n=13不满足条件“n=2(mod3)“,i=4,n=17,满足条件“n=2(mod3)“,不满足条件“n=1(mod5)“,i=8,n=25,不满足条件“n=2(mod3)“,i=16,n=41,满足条件“n=2(mod3)“,满足条件“n=1(mod5)”,退出循环,输出i的值为16.故选:C.由已知中的程序框图可知:该程序的功能是利用循环结构计算并输出变量i的值,模拟程序的运行过程,分析循环中各变量值的变化情况,可得答案.本题考查的知识点是程序框图,当循环的次数不多,或有规律时,常采用模拟循环的方法解答,属于基础题.9.答案:B解析:本题考查的知识点是古典概型概率计算公式和组合数的应用,属于基础题.分别计算出选出的4人随机分成两队进行羽毛球混合双打比赛的基本事件总数和满足A1和B1两人组成一队的基本事件个数,代入古典概型概率计算公式,可得答案.解:从3名男生A1,A2,A3和3名女生B1,B2,B3中各随机选出两名,共有C32C32=9,选出的4人随机分成两队进行羽毛球混合双打比赛有C21=2,故总的事件个数为9×2=18种,其中A1和B1两人组成一队有C21C21=4种,故则A1和B1两人组成一队参加比赛的概率为418=29,故选:B.10.答案:C解析:本题考查球的体积,点到平面的距离,是基础题.先求球的半径,再求截面圆的半径,然后求出球心到截面的距离.解:球的体积4√3π,则球的半径是√3,截面的面积为π,则截面圆的半径是1,所以球心到截面的距离为√2.。

西藏拉萨市2020届高三第二次模拟考试数学试题(文)(解析版)

西藏拉萨市2020届高三第二次模拟考试数学试题(文)(解析版)

西藏拉萨市2020届高三第二次模拟考试数学试题(文)一、选择题:本题共12小题,每小题5分,共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.在复平面内,复数(2)i i +对应的点的坐标为( ) A. ()1,2 B. ()2,1C. ()1,2-D. ()2,1-『答案』C『解析』复数i (2+i )=2i ﹣1,故复数对应的点的坐标为(﹣1,2), 故选:C.2.已知集合{|||2}A x x =<,{1,0,1,2,3}B =-,则A B =A. {0,1}B. {0,1,2}C. {1,0,1}-D. {1,0,1,2}-『答案』C 『解析』由,得,选C.3.下列函数中,在区间()0,∞+上为减函数的是( )A. y =B. 21y x =-C. 12xy ⎛⎫= ⎪⎝⎭D. 2log y x =『答案』C『解析』对于A 选项,函数y =()0,∞+上为增函数;对于B 选项,函数21y x =-在区间()0,∞+上为增函数;对于C 选项,函数12xy ⎛⎫= ⎪⎝⎭在区间()0,∞+上为减函数; 对于D 选项,函数2log y x =在区间()0,∞+上为增函数. 故选:C.4.函数()f x =)A. {2x x ≤或}3x ≥B. {3x x ≤-或}2x ≥-C. {}23x x ≤≤ D. {}32x x -≤≤-『答案』A『解析』由题意可得2560x x -+≥,解得2x ≤或3x ≥. 因此,函数()y f x =的定义域为{2x x ≤或}3x ≥. 故选:A.5.英国统计学家..E H 辛普森1951年提出了著名的辛普森悖论,下面这个案例可以让我们感受到这个悖论.有甲乙两名法官,他们都在民事庭和行政庭主持审理案件,他们审理的部分案件被提出上诉.记录这些被上述案件的终审结果如下表所示(单位:件):记甲法官在民事庭、行政庭以及所有审理的案件被维持原判的比率分别为1x ,2x 和x ,记乙法官在民事庭、行政庭以及所有审理的案件被维持原判的比率分别为1y ,2y 和y ,则下面说法正确的是( ) A. 11x y <,22x y <,x y >B. 11x y <,22x y <,x y <C. 11x y >,22x y >,x y >D. 11x y >,22x y >,x y <『答案』D『解析』由题意,可得法官甲民事庭维持原判的案件率为1290.90632x =≈,行政庭维持原判的案件率21000.847118x =≈,总体上维持原判的案件率为1290.86150x ==; 法官乙民事庭维持原判的案件率为1900.9100y ==,行政庭维持原判的案件率为2200.825y ==,总体上维持原判的案件率为1100.88125y ==.所以11x y >,22x y >,x y <.选 D .6.圆心为()2,1且和x 轴相切的圆的方程是( ) A. ()()22211x y -+-= B. ()()22211x y +++= C. ()()22215x y -+-= D. ()()22215x y +++=『答案』A『解析』圆心为()2,1且和x 轴相切的圆的半径为1,因此,所求圆的方程为()()22211x y -+-=.故选:A.7.为得到sin 23y x π⎛⎫=-⎪⎝⎭的图象,只需要将sin 2y x =的图象( ) A. 向左平移3π个单位 B. 向左平移6π个单位 C. 向右平移3π个单位D. 向右平移6π个单位『答案』D 『解析』因为,所以为得到sin 23y x π⎛⎫=- ⎪⎝⎭的图象,只需要将sin 2y x =的图象向右平移6π个单位;故选D . 考点:三角函数的图像变换.8.若正整数n 除以正整数m 的余数为r ,则记为r nMODm =,例如2125MOD =.如图程序框图的算法源于我国古化著名的《中国剩余定理》,执行该程序框图,则输出的i 等于( )A. 2B. 4C. 8D. 16『答案』D『解析』模拟执行程序如下:7,1n i ==开始,2,9i n ==,不满足13nMOD =,故4,13i n ==,满足13nMOD =,但不满足25nMOD =, 故8,21i n ==,不满足13nMOD =,故16,37i n ==,满足13nMOD =,满足25nMOD =, 输出16i =. 故选:D.9.羽毛球混合双打比赛每队由一男一女两名运动员组成. 某班级从3名男生1A ,2A ,3A 和3名女生1B ,2B ,3B 中各随机选出两名,把选出的4人随机分成两队进行羽毛球混合双打比赛,则1A 和1B 两人组成一队参加比赛的概率为( ) A.19B.29C.13D.49『答案』B『解析』由题可知:分别从3名男生、3名女生中选2人 :2233C C将选中2名女生平均分为两组:112122C CA将选中2名男生平均分为两组:112122C CA则选出的4人分成两队混合双打的总数为:221111112223322212133222222218C C C C C C C C C C A A A A == 1A 和1B 分在一组的数目为11224C C =所以所求的概率为42189= 故选:B10.设一个球形西瓜,切下一刀后所得切面圆的半径为4,球心到切面圆心的距离为3,则该西瓜的体积为( ) A. 100π B.2563π C.4003π D.5003π 『答案』D『解析』因为切面圆半径为4,球心到切面圆心的距离为3,5.所以球的体积为:34500533ππ=. 故选:D .11.已知点()2,0A 、()0,2B -.若点P 在函数y =则使得PAB △的面积为2的点P 的个数为( ) A. 1 B. 2C. 3D. 4『答案』C『解析』设点P 的坐标为(a ,直线AB 的方程为122x y-=,即20x y --=, 的设点P 到直线AB 的距离为d,则11222PABSAB d d =⋅=⨯=,解得d =另一方面,由点到直线的距离公式得d ==整理得0a =或40a =,0a ≥,解得0a =或1a =或a =综上,满足条件的点P 共有三个. 故选:C.12.设{}n a 是等差数列,且公差不为零,其前n 项和为n S .则“*n N ∀∈,1n n S S +>”是“{}n a 为递增数列”的( ) A. 充分而不必要条件 B. 必要而不充分条件 C. 充分必要条件 D. 既不充分也不必要条件『答案』A 『解析』{}n a 是等差数列,且公差d 不为零,其前n 项和为n S ,充分性:1n n S S +>,则10n a +>对任意的n *∈N 恒成立,则20a >,0d ≠,若0d <,则数列{}n a 为单调递减数列,则必存在k *∈N ,使得当n k >时,10n a +<,则1n n S S +<,不合乎题意;若0d >,由20a >且数列{}n a 为单调递增数列,则对任意的n *∈N ,10n a +>,合乎题意.所以,“*n N ∀∈,1n n S S +>”⇒“{}n a 为递增数列”;必要性:设10n a n =-,当8n ≤时,190n a n +=-<,此时,1n n S S +<,但数列{}n a 是递增数列.所以,“*n N ∀∈,1n n S S +>”⇐/“{}n a 为递增数列”.因此,“*n N ∀∈,1n n S S +>”是“{}n a 为递增数列”的充分而不必要条件. 故选:A.二、填空题:本题共4小题,每小题5分,共20分.13.已知双曲线()22210x y a a-=>的一条渐近线方程为0x y +=,则a =________.『答案』1『解析』双曲线()22210x y a a-=>的渐近线方程为0x y a ±=,由于该双曲线的一条渐近线方程为0x y +=,11a∴=,解得1a =. 故答案为:1.14.已知向量()1,a m =,()2,1b =,且a b ⊥,则m =________. 『答案』2- 『解析』()1,a m =,()2,1b =且a b ⊥,则20a b m ⋅=+=,解得2m =-.故答案为:2-.15.在ABC 中,4a =,5b =,6c =,则cos A =________,ABC 的面积为________.『答案』 (1).34 (2).『解析』由余弦定理得2222225643cos 22564b c a A bc +-+-===⨯⨯,则sin A =,因此,ABC 的面积为11sin 5622ABCSbc A ==⨯⨯=.故答案为:34;4. 16.函数()f x 的定义域为[)1,1-,其图象如图所示.函数()g x 是定义域为R 的奇函数,满足()()20g x g x -+=,且当()0,1x ∈时,()()g x f x =.给出下列三个结论:①()00g =;②函数()g x 在()1,5-内有且仅有3个零点; ③不等式()0f x -<的解集为{}10x x -<<. 其中,正确结论的序号是________. 『答案』①③『解析』因为函数()y g x =是奇函数,所以()()g x g x =--,又()()20g x g x -+=,所以()()2g x g x -=-,即()()2g x g x +=, 所以,函数()y g x =的周期为2.对于①,由于函数()y g x =是R 上的奇函数,所以,()00f =,故①正确; 对于②,()()20g x g x -+=,令1x =,可得()210g =,得()10g =,所以,函数()y g x =在区间[]1,1-上零点为0和1.因为函数()y g x =的周期为2,所以函数()y g x =在()1,5-内有5个零点,分别是0、1、2、3、4,故②错误;对于③,令t x =-,则需求()0f t <的解集,由图象可知,01t <<,所以10x -<<,故③正确. 故答案为:①③.三、解答题:共70分.解答应写出文字说明、证明过程或演算步骤.第17~21题为必考题,每个试题考生都必须作答.第22、23题为选考题,考生根据要求作答.. (一)必考题:共60分.17.某企业质量检验员为了检测生产线上零件的情况,从生产线上随机抽取了80个零件进行测量,根据所测量的零件尺寸(单位:mm ),得到如下的频率分布直方图:的(1)根据频率分布直方图,求这80个零件尺寸的中位数(结果精确到0.01);(2)已知尺寸在[)63.0,64.5上的零件为一等品,否则为二等品. 将这80个零件尺寸的样本频率视为概率,从生产线上随机抽取1个零件,试估计所抽取的零件是二等品的概率. 解:(1)由频率分布直方图的性质得:(0.0750.225)0.50.15+⨯=,0.150.750.50.525+⨯=,所以中位数在[63.0,63.5)内,设为a , 则0.15(63.0)0.750.5a +-⨯=, 解得63.47a ≈,所以估计中位数为63.47;(2)尺寸在[63.0,64.5)上的频率为(0.7500.6500.200)0.50.8++⨯=, 且10.80.2-=,所以从生产线上随机抽取1个零件,估计所抽取的零件是二等品的概率为0.2. 18.记n S 为数列{}n a 前n 项和,1122n n n S a --=(n ∈N *). (1)求1n n a a ++;(2)令2n n n b a a +=-,证明数列{}n b 是等比数列,并求其前n 项和n T . 解:(1)由1122n n n S a --=①,则11122n n nS a ++-=② ②-①可得:1111112222n n n n n na a a ++--+=-=-的所以112n n na a ++=-(2)由(1)可知:112n n n a a ++=-③ 则21112n n n a a ++++=-④ ④-③可得:211111222n n n n n a a +++⎛⎫-=---= ⎪⎝⎭ 则112n n b +=,且1212n n b ++= 令1n =,则114b =,211112122n n n n b b +++== 所以数列{}n b 是首项为14,公比为12的等比数列所以111111114211222212n n nn T +⎛⎫- ⎪⎛⎫⎝⎭==-=- ⎪⎝⎭- 19.如图,三棱锥P ABC -中,PA PC =,AB BC =,120APC ︒∠=,90ABC ︒∠=,2AC ==.(1)求证:AC PB ⊥; (2)求点C 到平面PAB 的距离.(1)证明:取AC 的中点为O ,连接BO ,PO .在PAC ∆中,PA PC =,O 为AC 的中点,PO AC ∴⊥, 在BAC ∆中,BA BC =,O 为AC 的中点,BO AC ∴⊥, OP OB O =,OP ,OB ⊂平面OPB ,AC ∴⊥平面OPB ,PB ⊂平面POB ,AC BP ∴⊥;(2)解:在直角三角形ABC 中,由2AC =,O 为AC 的中点,得1BO =,在等腰三角形APC 中,由120APC ∠=︒,得PO =, 又2PB =,222PO BO PB ∴+=,即PO BO ⊥, 又PO AC ⊥,ACOB O =,PO ∴⊥平面ABC ,求解三角形可得PA ,又AB =12PAB S ∆==. 设点C 到平面PAB 的距离为h ,由C P A ABC P B V V --=,得111323⨯=,解得h =故点C 到平面PAB 的距离为5. 20.已知函数()()2112x a f x e x e x =--,0a <. (1)求曲线()y f x =在点()()0,0f 处的切线方程;(2)求函数()f x 的极小值;(3)求函数()f x 的零点个数.解:(1)因为()()2112x a f x e x e x =--,所以()x a f x xe xe '=-. 所以()01f =-,()00f '=.所以曲线()y f x =在点()()0,0f 处的切线为1y =-;(2)因为()()x a x a f x xe xe x e e '=-=-,令()0f x '=,得0x =或()0x a a =<. 列表如下:所以,函数()y f x =的单调递增区间为(),a -∞和()0,∞+,单调递减区间为(),0a , 所以,当0x =时,函数()y f x =有极小值()01f =-;(3)当1x ≤时,()0f x <,且()222220a f e e e =->->. 由(2)可知,函数()y f x =在()0,∞+上单调递增,所以函数()y f x =的零点个数为1. 21.已知椭圆C 的短轴的两个端点分别为()0,1A 、()0,1B -,焦距为(1)求椭圆C 的方程;(2)已知直线y m =与椭圆C 有两个不同的交点M 、N ,设D 为直线AN 上一点,且直线BD 、BM 的斜率的积为14-.证明:点D 在x 轴上. 解:(1)由题设,得1b c =⎧⎪⎨=⎪⎩2224a b c =+=,即2a =. 故椭圆C 的方程为2214x y +=; (2)设()1,M x m ,则()1,N x m -,10x ≠,11m -<<.所以直线BM 的斜率为()11110m m x x --+=-, 因为直线BD 、BM 的斜率的积为14-,所以直线BD 的斜率为()141x m -+. 直线AN 的方程为111m y x x -=+,直线BD 的方程为()1141x y x m =--+.联立()1111141m y x x x y x m -⎧=+⎪⎪⎨⎪=--⎪+⎩,解得点D 的纵坐标为221221114114D x m y x m --+=-+-. 因为点M 在椭圆C 上,所以22114x m +=,则0D y =,所以点D 在x 轴上. (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.『选修4--4:坐标系与参数方程』22.已知曲线1C 的参数方程为cos ,(1sin ,x t t y t αα=⎧⎨=+⎩为参数), 曲线2C的参数方程为sin ,(x y θθ=⎧⎪⎨=⎪⎩为参数). (1)求1C 与2C 的普通方程;(2)若1C 与2C 相交于A ,B两点,且AB =sin α的值. 解:(1)由曲线1C 的参数方程为cos (1sin x t t y t αα=⎧⎨=+⎩为参数),消去参数t ,可得tan 1y x α=+; 由曲线2C的参数方程为sin x y θθ=⎧⎪⎨=⎪⎩为参数),消去参数θ,可得y =221(0)2y x y +=. (2)把cos (1sin x t t y t αα=⎧⎨=+⎩为参数)代入2212y x +=, 得22(1cos )2sin 10t t αα++-=. ∴1222sin 1t t cos αα-+=+,12211t t cos α-=+.12||||AB t t ∴=-==. 解得:2cos 1α=,即cos 1α=±,满足△0>.sin 0α∴=.『选修4-5:不等式选讲』23.已知0a >,0b >,且1a b +=(1)求12a b+的最小值; (2)证明:2221ab b a b +<++. 解:(1)121222()()3323a b a a b a b a b b a b a +=++=+++=+“b =”时取等号,故12a b+的最小值为3+ (2)222222222222414(2)122155555ab b ab b ab b bb a b b b ab b a a +++===+++++++, 当且仅当1,2a b ==时取等号,此时1a b +≠. 故2221ab b a b +<++.。

西藏拉萨市2020届高三第二次模拟考试汉语文试题 Word版含答案

西藏拉萨市2020届高三第二次模拟考试汉语文试题 Word版含答案

绝密★ 启用前拉萨市2020届高三第二次模拟考试试卷汉语(供用本民族语言文字授课的少数民族考生使用)注意事项:1.本试卷分第Ⅰ卷和第Ⅱ卷两部分。

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.作答时,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。

一、知识与运用:本题共15 小题,每小题3 分,共45 分;每小题给出的四个选项中,只有一项符合题目要求。

1.下列各项词语中,加点字读音完全正确的一项是()A.勾.当(gōu)富饶.(ráo)弄巧成拙.(zhuó)风驰电掣.(chè)B.庇.护(bì)归省.(xǐng)贻.笑大方(yí)摩肩接踵.(zhǒng)C.婆娑.(suō)挑.逗(tiāo)强聒.不舍(guō)含英咀.华(jǔ)D.拘泥.(ní)恫.吓(dòng)鳞次栉.比(jié)风雪载.途(zài)2.下列各项词语书写无误的一项是() A.审讯涣散粗制烂造顾名思义B.吞噬要决力挽狂斓鞠躬尽瘁C.嶙峋黯然根深蒂固通霄达旦D.琐屑慰藉望眼欲穿不可名状3.下列各项能够完全构成近义词的一项是() A.不置可否——模棱两可疾言厉色——和颜悦色B.毛骨悚然——心惊胆战深谋远虑——处心积虑C.无所不为——作恶多端随机应变——见机行事D.同甘共苦——休戚与共风和日丽——风雨无阻4.下列各项词语,全部具有褒义的一项是() A.旖旎质朴昭雪英武忠烈透辟 B.桎梏酣畅诙谐豁然磅礴征兆 C.丰沛叵测凝神琢磨奏效周济 D.翩跹挚诚娴熟赞许栽赃誉称5.下列各组句子中,加点词意思相同的一项是() A.①虽然我们是素不相识的两个人,但是这一路上我们谈得很投.机.。

②不得不说,这些投.机.分子恰当地利用时机谋取了暴利。

B.①很多事实证明,世界上的一切知识无不起.源.于劳动。

②海洋是生命的起.源.,自从动物从海洋爬上陆地就一直处于进化之中。

西藏拉萨市2020届高三第二次模拟考试汉语文试题

西藏拉萨市2020届高三第二次模拟考试汉语文试题

高中学习讲义绝密★ 启用前拉萨市2020届高三第二次模拟考试试卷汉语(供用本民族语言文字授课的少数民族考生使用)注意事项:1.本试卷分第Ⅰ卷和第Ⅱ卷两部分。

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.作答时,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。

一、知识与运用:本题共15 小题,每小题3 分,共45 分;每小题给出的四个选项中,只有一项符合题目要求。

1.下列各项词语中,加点字读音完全正确的一项是()A.勾.当(gōu)富饶.(ráo)弄巧成拙.(zhuó)风驰电掣.(chè)B.庇.护(bì)归省.(xǐng)贻.笑大方(yí)摩肩接踵.(zhǒng)C.婆娑.(suō)挑.逗(tiāo)强聒.不舍(guō)含英咀.华(jǔ)D.拘泥.(ní)恫.吓(dòng)鳞次栉.比(jié)风雪载.途(zài)2.下列各项词语书写无误的一项是() A.审讯涣散粗制烂造顾名思义B.吞噬要决力挽狂斓鞠躬尽瘁C.嶙峋黯然根深蒂固通霄达旦D.琐屑慰藉望眼欲穿不可名状3.下列各项能够完全构成近义词的一项是() A.不置可否——模棱两可疾言厉色——和颜悦色B.毛骨悚然——心惊胆战深谋远虑——处心积虑C.无所不为——作恶多端随机应变——见机行事D.同甘共苦——休戚与共风和日丽——风雨无阻4.下列各项词语,全部具有褒义的一项是() A.旖旎质朴昭雪英武忠烈透辟 B.桎梏酣畅诙谐豁然磅礴征兆 C.丰沛叵测凝神琢磨奏效周济 D.翩跹挚诚娴熟赞许栽赃誉称5.下列各组句子中,加点词意思相同的一项是() A.①虽然我们是素不相识的两个人,但是这一路上我们谈得很投.机.。

②不得不说,这些投.机.分子恰当地利用时机谋取了暴利。

B.①很多事实证明,世界上的一切知识无不起.源.于劳动。

②海洋是生命的起.源.,自从动物从海洋爬上陆地就一直处于进化之中。

2020届西藏拉萨市高三第二次模拟考试文科综合历史试题

2020届西藏拉萨市高三第二次模拟考试文科综合历史试题

拉萨市2020届高三第二次模拟考试试卷文科综合能力测试历史试题24.商代女性可以参与军事、主持祭祀等;周代女性逐渐被束缚在纺纱织布等生产活动范围内。

这一变化反映了周代.A.井田制瓦解B.礼乐制度推行C.宗法制完备D.纺织技术提高.25.唐代宫廷的七部乐、九部乐、十部乐中有来自西域的龟兹、高昌、疏勒等乐,有来自印度、天竺、康国、安国等乐,以及来自高丽、日本、扶南等乐。

促成音乐呈现这种特征的主要因素是唐朝A.政治军事实力的强大B.百家争鸣局面的延续C.加强现实统治的需要D.兼收并蓄的文化政策26.北宋画师刘宗道“作《照盆孩儿》,以水指影,影亦相指,形影自分。

每作一扇,必画数百本,然后出货,即日流布,实恐他人传模之先也。

”这可以佐证,北宋时期A.雕版印刷术尚未普及B.画家的商业意识浓厚C.文人画开始一统天下D.绘画普遍受理学影响27.观察下面《明朝各代朝贡次数统计图》。

据此可反映出明朝A.朝贡贸易解体B.财政能力下降C.私人贸易取代官方贸易D.改变了对外开放的政策28.20世纪初,清政府不得不以立法的形式将西方的工厂制度、公司制度和一系列与之配套的经济制度正式引入中国。

清政府这一做法A.体现了中国经济殖民地化B.强化了官僚资本的主导地位C.有利于民族资本主义发展D.解决了近代工业发展的困境29.新文化运动后期,在各种进步刊物中,以“新”字命名的刊物大量涌现,如《新社会》《新生活》、《新江西》等。

这反映出新文化运动A.催动知识分子主体意识觉醒B.改变了中国传统文化的格局C.引发了许多救国思潮的涌现D.对新闻出版业影响尤为突出30.1930年,武汉、长沙、广州等南方的大中城市,陡然增加了许多豪绅地主,尤其是江西的南昌、赣州等地,更是在短时间内涌人了十多万地主及其家属。

导致这一现象的主要原因是A.工农武装割据思想的实践B.国内发生严重经济危机C.北伐战争胜利进军的影响D.民族资本主义发展受阻31.1952 年6月10日,毛泽东为新中国体育工作题写了“发展体育运动,增强人民体质”12个大字,“锻炼身体”的口号成为这一-时期的热词。

2020年西藏拉萨市高考数学二模试卷(二)(有答案解析)

2020年西藏拉萨市高考数学二模试卷(二)(有答案解析)

2020年西藏拉萨市高考数学二模试卷(二)一、选择题(本大题共12小题,共60.0分)1.已知集合A={x|y=ln(x-1)},B={x|x2-4≤0},则A∩B=()A. {x|x≥-2}B. {x|1<x<2}C. {x|1<x≤2}D. {x|x≥2}2.若复数z满足(z+1)i=1+i,则|z|=()A. -iB. 1-iC.D. 13.在普通高中新课程改革中,某地实施“3+1+2”选课方案.该方案中“2”指的是从政治、地理、化学、生物4门学科中任选2门,假设每门学科被选中的可能性相等,那么政治和地至少有一门被选中的概率是()A. B. C. D.4.(x+y)(2x-y)5的展开式中的x3y3系数为()A. -80B. -40C. 40D. 805.经统计,某市高三学生期末数学成绩X-N(85,σ2),且P(80<X<90)=0.3,则从该市任选一名高三学生,其成绩不低于90分的概率是()A. 0.35B. 0.65C. 0.7D. 0.856.将函数y=sin(2x+)的图象向右平移个单位长度后,所得图象的一个对称中心为()A. (,0)B. (,0)C. (,0)D. (,0)7.已知双曲线的一条渐近线过点(b,4),则C的离心率为()A. B. C. D. 38.如图所示算法框图,当输入的x为1时,输出的结果为()A. 3B. 4C. 5D. 69.某简单几何体的三视图如图所示,若该几何体的所有顶点都在球O的球面上,则球O的体积是()A.B.C. 12πD.10.已知等差数列{a n}的前n项和S n=n2+bn+c,等比数列{b n}的前n项和T n=3n+d,则向量=(c,d)的模长为()A. 1B.C.D. 无法确定11.设椭圆E的两焦点分别为F1,F2,以F1为圆心,|F1F2|为半径的圆与E交于P,Q两点.若△PF1F2为直角三角形,则E的离心率为()A. -1B.C.D. +112.已知定义在R上的函数f(x)的导函数为f'(x),且f(x)+f'(x)>1,设a=f(2)-1,b=e[f(3)-1],则a,b的大小关系为()A. a<bB. a>bC. a=bD. 无法确定二、填空题(本大题共4小题,共20.0分)13.设x,y满足约束条件,则目标函数z=x+y的最大值为______.14.已知函数f(x)=x3+a log3x,若f(2)=6,则=______.15.古代数学著作《九章算术》有如下问题:“今有女子善织,日自倍,五日织五尺,问日织几何?”意思是:“一女子善于织布,每天织布的布都是前一天的2倍,已知她5天共织布5尺,问这女子每天分别织布多少?”根据上题的已知条件,可求得该女子第3天所织布的尺数为______.16.设函数f(x)=e x(2x-1)-ax+a,其中a<1,若存在唯一的整数x0,使得f(x0)<0,则a的取值范围是______.三、解答题(本大题共7小题,共82.0分)17.△ABC的内角A,B,C的对边分别为a,b,c,且a(sin B-cos C)=(c-b)cos A.(1)求A;(2)若b=,点D在BC边上,CD=2,∠ADC=,求△ABC的面积.18.某食品公司研发生产一种新的零售食品,从产品中抽取200件作为样本,测量这些产品的项质量指标值,由测量结果得到如下的频率分布直方图:(1)求直方图中a的值;(2)由频率分布直方图可认为,这种产品的质量指标值Z服从正态分布N(200,144),试计算这批产品中质量指标值落在(200,212)上的件数;(3)设产品的生产成本为y,质量指标值为x,生产成本与质量指标值满足函数关系式y=,假设同组中的每个数据用该组数据区间的右端点代替,试计算生产该食品级的平均成本.参考数据:若Z~N(μ,σ2),则P(μ-σ<Z<μ+σ)=0.683,P(μ-2σ<Z<μ+2σ)=0.954,P(μ-3σ<Z<μ+3σ)=0.997.19.如图,四边形ABCD为正方形,E,F分别为AD,BC的中点,以DF为折痕把折起,使点C到达点P的位置,且.(1)证明:平面平面ABFD;(2)求DP与平面ABFD所成角的正弦值.20.设抛物线E:y2=2px(p>0)的焦点为F,直线x=p与E交于A,B两点,△ABF的面积为8.(1)求E的方程;(2)若M,N是E上的两个动点,|MF|+|NF|=8,试问:是否存在定点S,使得|SM|=|SN|?若存在,求S的坐标;若不存在,请说明理由.21.已知函数f(x)=xe x-ax-a ln x.(1)若a=e,求f(x)的单调区间;(2)若f(x)≥1,求a的取值范围.22.在直角坐标系xOy中,直线l的参数方程为(t为参数),以坐标原点为极点,x轴的正半轴为极轴建立极坐标系,曲线C的极坐标方程为,点P的极坐标为.(1)求C的直角坐标方程和P的直角坐标;(2)设l与C交于A,B两点,线段AB的中点为M,求|PM|23.已知函数f(x)=|x+1|-|x-2|.(1)求不等式f(x)≥1的解集;(2)若不等式f(x)≥x2-x+m的解集非空,求m的取值范围.-------- 答案与解析 --------1.答案:C解析:解:A={x|x>1},B={x|-2≤x≤2};∴A∩B={x|1<x≤2}.故选:C.可求出集合A,B,然后进行交集的运算即可.考查描述法的定义,对数函数的定义域,一元二次不等式的解法,交集的运算.2.答案:D解析:解:由(z+1)i=1+i,得z+1=,∴z=-i,则|z|=1.故选:D.把已知等式变形,利用复数代数形式的乘除运算化简求得z,再由复数模的计算公式求解.本题考查复数代数形式的乘除运算,考查复数模的求法,是基础题.3.答案:D解析:解:设A={两门至少有一门被选中},则={两门都没被选中},包含1个基本事件,则p()==,∴P(A)=1-=.故选:D.本题可从反面思考,两门至少有一门被选中的反面是两门都没被选中.两门都没被选中包含1个基本事件,代入概率公式,即可得到两门都没被选中的概率,则两门至少有一门被选中的概率可得.本题考查了古典概型的概率计算,属于基础题.4.答案:C解析:【分析】本题考查了二项式定理的应用,考查了推理能力与计算能力,属于中档题.(2x-y)5的展开式的通项公式:T r+1=(2x)5-r(-y)r=25-r(-1)r x5-r y r.令5-r=2,解得r=3;令5-r=3,解得r=2.即可得出.【解答】解:(2x-y)5的展开式的通项公式:T r+1=(2x)5-r(-y)r=25-r(-1)r x5-r y r.令5-r=2,解得r=3.令5-r=3,解得r=2.x项:22×(-1)3,y项:23×,∴(x+y)(2x-y)5的展开式中的x3y3系数=22×(-1)3+23×=40.故选C.5.答案:A解析:解:∵学生成绩X服从正态分布N(85,σ2),且P(80<X<90)=0.3,∵P(X≥90)=[1-P(80<X<90)]=,∴从该市任选一名高三学生,其成绩不低于90分的概率是0.35.故选:A.由已知直接利用正态分布曲线的对称性求解.本题考查正态分布曲线的特点及曲线所表示的意义,考查正态分布中两个量μ和σ的应用,考查曲线的对称性,属于基础题.6.答案:A解析:解:将函数y=sin(2x+)的图象向右平移个单位长度后,所得图象对应的函数解析式为y=sin(2x-),令2x-=kπ,求得x=+,k∈Z,故函数的对称中心为(+,0),k∈Z,故选:A.利用函数y=A sin(ωx+φ)的图象变换规律,正弦函数的图象的对称性,得出结论.本题主要考查函数y=A sin(ωx+φ)的图象变换规律,正弦函数的图象的对称性,属于基础题.7.答案:C解析:解:双曲线的渐近线方程为y=±bx,由题意可得4=b2,可得b=2,则双曲线的离心率为e===.故选:C.求得双曲线的渐近线方程,由题意可得b=2,再由离心率公式,计算可得所求值.本题考查双曲线的方程和性质,主要是渐近线方程和离心率的求法,考查方程思想和运算能力,属于基础题.8.答案:C解析:解:当x=1时,x>1不成立,则y=x+1=1+1=2,i=0+1=1,y<20不成立,x=2,x>1成立,y=2x=4,i=1+1=2,y<20成立,x=4,x>1成立,y=2x=8,i=2+1=3,y<20成立,x=8,x>1成立,y=2x=16,i=3+1=4,y<20成立x=16,x>1成立,y=2x=32,i=4+1=5,y<20不成立,输出i=5,故选:C.根据程序框图,利用模拟验算法进行求解即可.本题主要考查程序框图的识别和判断,利用模拟运算法是解决本题的关键.9.答案:B解析:解:由三视图还原原几何体如图,可知该几何体为直三棱柱,底面为等腰直角三角形,直角边长为2,侧棱长为2.把该三棱柱补成为正方体,则正方体对角线长为.∴该三棱柱外接球的半径为.体积V=.故选:B.由三视图还原原几何体,可知该几何体为直三棱柱,底面为等腰直角三角形,直角边长为2,侧棱长为2,然后利用分割补形法求解.本题考查空间几何体的三视图,考查多面体外接球表面积与体积的求法,是中档题.10.答案:A解析:解:等差数列{a n}的前n项和S n=n2+bn+c,等比数列{b n}的前n项和T n=3n+d,由S n=n2+n(a1-),(d'为等差数列的公差),可得c=0,由T n==-•q n,可得d=-1,则向量=(c,d)=(0,-1)的模为1.故选:A.由等差数列和等比数列的求和公式,可得c=0,d=-1,再由向量模的公式计算即可得到所求值.本题考查等差数列和等比数列的求和公式的运用,考查向量的模的求法,注意运用分析法,考查运算能力,属于基础题.11.答案:A解析:解:如图所示,∵△PF1F2为直角三角形,∴∠PF1F2=90°,∴|PF1|=2c,|PF2=2c,则2c+2c=2a,解得e==-1.故选:A.如图所示,△PF1F2为直角三角形,可得∠PF1F2=90°,可得|PF1|=2c,|PF2=2c,利用椭圆的定义可得2c+2c=2a,即可得出.本题考查了椭圆与圆的定义标准方程及其性质,考查了推理能力与计算能力,属于中档题.12.答案:A解析:【分析】本题考查函数的导数与函数单调性的关系,注意构造新函数g(x).根据题意,设g(x)=e x[f(x)-1],求导分析可得g′(x)>0,则函数g(x)在R上为增函数,又由g(2)=e2[f(2)-1]=ae2,g(3)=e3[f(3)-1]=be2,结合函数的单调性分析可得ae2<be2,变形即可得答案.【解答】解:根据题意,设g(x)=e x[f(x)-1]=e x f(x)-e x,其导数g′(x)=e x f′(x)+e x f(x)-e x=e x[f(x)+f'(x)-1],又由f(x)与f′(x)满足f(x)+f'(x)>1,则有g′(x)>0,则函数g(x)在R上为增函数,则g(2)=e2[f(2)-1]=ae2,g(3)=e3[f(3)-1]=be2,因为g(2)<g(3),则ae2<be2,则有a<b,故选:A.13.答案:3解析:解:x,y满足约束条件,表示的区域是如下图示的三角形,3个顶点是A(1,2),B(2,0),C(1,0),目标函数z=x+y在(1,2)取最大值3.故答案为:3.先画出约束条件的可行域,再求出可行域中各角点的坐标,将各点坐标代入目标函数的解析式,分析后易得目标函数Z=x+y的最大值.本题考查线性规划的简单应用,线性规划问题首先作出可行域,若为封闭区域(即几条直线围成的区域)则区域端点的值是目标函数取得最大或最小值,求出直线交点坐标代入目标函数即可求出最大值.14.答案:解析:【分析】本题考查函数值的计算,关键是求出函数的解析式,属于基础题.根据题意,由f(2)的值分析可得f(2)=8+a log32=6,变形可得a log32=-2,则有则=()3+a log3=-a log32,代入计算可得答案.【解答】解:因为f(x)=x3+a log3x,所以f(2)=8+a log32=6,所以a log32=-2,所以=+a log3=-a log32=.故答案为.15.答案:解析:【分析】本题考查了等比数列的通项公式,等比数列求和公式的应用,属于简单题.设这女子每天分别织布形成数列{a n}尺.则该数列{a n}为等比数列,公比q=2,其前5项和S5=5.利用等比数列的通项公式及其前n项和公式即可得出.【解答】解:设这女子每天分别织布形成数列{a n}尺.则该数列{a n}为等比数列,公比q=2,其前5项和S5=5.∴,解得a1=,∴.故答案为:.16.答案:[,1)解析:解:函数f(x)=e x(2x-1)-ax+a,其中a<1,设g(x)=e x(2x-1),y=ax-a,∵存在唯一的整数x0,使得f(x0)<0,∴存在唯一的整数x0,使得g(x0)在直线y=ax-a的下方,∵g′(x)=e x(2x+1),∴当x<-时,g′(x)<0,∴当x=-时,[g(x)]min=g(-)=-.当x=0时,g(0)=-1,g(1)=e>0,直线y=ax-a恒过(1,0),斜率为a,故-a>g(0)=-1,且g(-1)=-3e-1≥-a-a,解得.∴a的取值范围是[,1).故答案为:[,1).设g(x)=e x(2x-1),y=ax-a,则存在唯一的整数x0,使得g(x0)在直线y=ax-a的下方,由此利用导数性质能求出a的取值范围.本题考查实数的取值范围的求法,是中档题,解题时要认真审题,注意导数性质的合理运用.17.答案:解:(1)∵a(sin B-cos C)=(c-b)cos A,∴由正弦定理可得:sin A sin B-sin A cos C=sin C cos A-sin B cos A,∴可得sin A sin B+sin B cos A=sin C cos A+sin A cos C,可得:sin B(sin A+cos A)=sin B,∵sin B>0,∴sin A+cos A=2sin(A+)=1,可得sin(A+)=,∵A∈(0,π),∴A+∈(,),∴A+=,可得:A=.(2)∵b=,点D在BC边上,CD=2,∠ADC=,∴在△ADC中,由正弦定理,可得:=,可得:sin∠CAD=1,∴∠CAD=,可得:∠C=π-∠CAD-∠ADC=,∴∠B=π-∠BAC-∠C=,∴AB=AC=,∴S△ABC=AB•AC•sin A==.解析:本题主要考查了正弦定理,三角函数恒等变换的应用,三角形内角和定理,三角形的面积公式在解三角形中的应用,考查了计算能力和转化思想,属于中档题.(1)由正弦定理,三角函数恒等变换的应用化简已知可得:sin(A+)=,结合范围A∈(0,π),可得A+∈(,),进而可求A的值.(2)在△ADC中,由正弦定理可得sin∠CAD=1,可求∠CAD=,利用三角形内角和定理可求∠C,∠B,可求AB=AC=,利用三角形的面积公式即可计算得解.18.答案:解:(1)由频率分布直方图得:(0.002+0.009+0.022+a+0.024+0.008+0.002)×10=1,解得a=0.033.(2)∵Z~N(200,144),则μ=200,σ2=144,∴σ=12,∴μ-σ=188,μ+σ=212,∵P(μ-σ<Z<μ+σ)=0.683,∴P(188<Z<212)=0.683,∴P(200<Z<212)=0.3415.∴这批产品中质量指标值落在(200,212)上的件数为200×0.3415=68.3≈68.(3)由频率分布直方图和题设条件可得产品的成本分布及其概率分布表如下:组号1 234567分组[66,70)[70,74)[74,78)[78,82)[82,92)[92,100)[100,108)频率 0.02 0.09 0.22 0.33 0.24 0.08 0.02根据题意生产该食品的平均成本为:70×0.02+74×0.09+78×0.22+82×0.33+92×0.24+100×0.08+108×0.02=84.52.解析:(1)由频率分布直方图能求出a.(2)由Z~N(200,144),得μ=200,σ=12,μ-σ=188,μ+σ=212,从而P(188<Z<212)=0.683,进而P(200<Z<212)=0.3415.由此能求出这批产品中质量指标值落在(200,212)上的件数.(3)由频率分布直方图和题设条件可得产品的成本分布及其概率分布表如下:组号1 234567分组[66,70)[70,74)[74,78)[78,82)[82,92)[92,100)[100,108)频率 0.02 0.09 0.22 0.33 0.24 0.08 0.02根据题意生产该食品的平均成本为:70×0.02+74×0.09+78×0.22+82×0.33+92×0.24+100×0.08+108×0.02=84.52.本题考查频率、概率、平均数的求法,考查频率分布直方图、正态分布等基础知识,考查运算求解能力,是基础题.19.答案:(1)证明:由题意,点E、F分别是AD、BC的中点,则,,由于四边形ABCD为正方形,所以EF⊥BC.由于PF⊥BF,EF∩PF=F,则BF⊥平面PEF.又因为BF⊂平面ABFD,所以:平面PEF⊥平面ABFD.(2)在平面PEF中,过P作PH⊥EF于点H,连接DH,由于EF为面ABCD和面PEF的交线,PH⊥EF,则PH⊥面ABFD,故PH⊥DH.在三棱锥P-DEF中,可以利用等体积法求PH,因为DE∥BF且PF⊥BF,所以PF⊥DE,又因为△PDF≌△CDF,所以∠FPD=∠FCD=90°,所以PF⊥PD,由于DE∩PD=D,则PF⊥平面PDE,故V F-PDE=,因为BF∥DA且BF⊥面PEF,所以DA⊥面PEF,所以DE⊥EP.设正方形边长为2a,则PD=2a,DE=a在△PDE中,,所以,故V F-PDE=,又因为,所以PH==,所以在△PHD中,sin∠PDH==,即∠PDH为DP与平面ABFD所成角的正弦值为:.解析:(1)利用正方形的性质可得BF垂直于面PEF,然后利用平面与平面垂直的判断定理证明即可.(2)利用等体积法可求出点P到面ABCD的距离,进而求出线面角.本题主要考查点、直线、平面的位置关系.直线与平面所成角的求法.几何法的应用,考查转化思想以及计算能力.20.答案:解:(1)把x=p代入抛物线方程y2=2px(p>0),可得:y2=2p•p,解得y=p.∵△ABF的面积为8.∴×2p=8,解得p=4.∴E的方程为:y2=8x.(2)假设存在定点S,使得|SM|=|SN|.设M(x1,y1),N(x2,y2),线段MN的中点为G(x0,y0).∵|MF|+|NF|=8,∴x1+x2+4=8,化为:x1+x2=4.∴x0=2.当MN⊥x轴时满足题意,因此点S必然在x轴上.设直线MN的方程为:ty=x+m.联立,化为:y2-8ty-8m=0.∴y1+y2=8t,∴y0=4t.线段MN的垂直平分线方程为:-(y-4t)=x-2,令y=0,可得:x=6.∴存在定点S(6,0),使得|SM|=|SN|.解析:(1)把x=p代入抛物线方程y2=2px(p>0),可得:y2=2p•p,解得y=p.根据△ABF的面积为8.可得×2p=8,解得p.(2)假设存在定点S,使得|SM|=|SN|.设M(x1,y1),N(x2,y2),线段MN的中点为G(x0,y0).由|MF|+|NF|=8,可得x1+x2+4=8,化为:x1+x2=4.x0=2.当MN⊥x轴时满足题意,因此点S必然在x轴上.设直线MN的方程为:ty=x+m.与抛物线方程联立可得:y2-8ty-8m=0.根据根与系数的关系、中点坐标公式可得y0.可得线段MN的垂直平分线方程,进而得出结论.本题考查了抛物线的定义标准方程、一元二次方程的根与系数的关系、中点坐标公式、垂直平分线的性质,考查了推理能力与计算能力,属于中档题.21.答案:解:(1)a=e时,f′(x)=(x+1)e x(e x-),(x>0).令u(x)=e x-在x>0时单调递增,u(1)=0.∴函数f(x)在(0,1)上单调递减,在(1,+∞)上单调递增.(2)令g(x)=f(x)-1=xe x-ax-a ln x-1.由f(x)≥1⇔g(x)≥0,(x>0).g′(x)=(x+1)e x-a-=(x+1)(e x-).a≤0时,g′(x)>0,函数g(x)在(0,+∞)上单调递增.a>0时,令g′(x)=0,可得=,可得x0=ln a-ln x0,x0>0.可得:x=x0>0时函数g(x)取得极小值即最小值,g(x0)=x0-ax0-a ln x0-1=a-a lna-1≥0,令u(a)=a-a lna-1,u(1)=0.u′(a)=1-ln a-1=-ln a,可得a=1时,函数u(a)取得极大值即最大值,而u(1)=0.∴只有a=1满足条件.∴a∈{1}.解析:(1)a=e时,f′(x)=(x+1)e x(e x-),(x>0).令u(x)=e x-在x>0时单调递增,u(1)=0.即可得出单调性.(2)令g(x)=f(x)-1=xe x-ax-a ln x-1.由f(x)≥1⇔g(x)≥0,(x>0).g′(x)=(x+1)e x-a-=(x+1)(e x-).对a分类讨论,即可得出单调性极值与最值.本题考查了利用导数研究函数的单调性极值与最值、方程与不等式的解法、分类讨论方法、等价转化方法,考查了推理能力与计算能力,属于难题.22.答案:解:(1)由ρ2=得ρ2+ρ2sin2θ=2,将ρ2=x2+y2,y=ρsinθ代入上式并整理得曲线C的直角坐标方程为+y2=1,设点P的直角坐标为(x,y),因为P的极坐标为(,),所以x=ρcosθ=cos=1,y=ρsinθ=sin=1,所以点P的直角坐标为(1,1);(2)将代入+y2=1,并整理得41t2+110t+25=0,因为△=1102-4×41×25=8000>0,故可设方程的两根为t1,t2,则t1,t2为A,B对应的参数,且t1+t2=-,依题意,点M对应的参数为,所以|PM|=||=.解析:(1)利用互化公式把曲线C化成直角坐标方程,把点P的极坐标化成直角坐标;(2)把直线l的参数方程的标准形式代入曲线C的直角坐标方程,根据韦达定理以及参数t的几何意义可得.本题考查了简单曲线的极坐标方程,属中档题.23.答案:解:(1)∵f(x)=|x+1|-|x-2|=,f(x)≥1,∴当-1≤x≤2时,2x-1≥1,解得1≤x≤2;当x>2时,3≥1恒成立,故x>2;综上,不等式f(x)≥1的解集为{x|x≥1}.(2)原式等价于存在x∈R使得f(x)-x2+x≥m成立,即m≤[f(x)-x2+x]max,设g(x)=f(x)-x2+x.由(Ⅰ)知,g(x)=,当x<-1时,g(x)=-x2+x-3,其开口向下,对称轴方程为x=>-1,∴g(x)<g(-1)=-1-1-3=-5;当时,g(x)=-x2+3x-1,其开口向下,对称轴方程为x=∈,∴g(x)≤g()=-+-1=;当x>2时,g(x)=-x2+x+3,其开口向下,对称轴方程为x=<2,∴g(x)<g(2)=-4+2+3=1;综上,g(x)max=.∴m的取值范围为(-∞,].解析:本题考查绝对值不等式的解法,去掉绝对值符号是解决问题的关键,突出考查分类讨论思想与等价转化思想、函数与方程思想的综合运用,属于中档题.(1)由于f(x)=|x+1|-|x-2|=,解不等式f(x)≥1可分-1≤x≤2与x>2两类讨论即可解得不等式f(x)≥1的解集;(2)依题意可得m≤[f(x)-x2+x]max,设g(x)=f(x)-x2+x,分x<1、、x>2三类讨论,可求得g(x)max=,从而可得m的取值范围.。

西藏拉萨市2020届高三第二次模拟考试语文试题(含答案)

西藏拉萨市2020届高三第二次模拟考试语文试题(含答案)

绝密★启用前姓名_______________准考证号码_____________拉萨市2020届高三第二次模拟考试试卷语文注意事项: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.作答时,务必将答案写在答题卡上。

写在本试卷及草稿纸上无效。

3.考试结束后,将本试卷和答题卡一并交回。

一、现代文阅读(36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。

有趣,和枯燥、乏味相对,是一个人身上闪闪发光的品质,是平淡生活里的“调味剂”。

说一个人有趣,是很高的评价。

那么,何为有趣?明人袁宏道说,“世人所难得者唯趣。

趣如山上之色、水中之味、花中之光、女中之态,虽善说者不能下一语,唯会心者知之。

”对“什么是趣”,古今中外,尚无定论,只能见仁见智。

在文人墨客笔下,人有人趣,物有物趣,自然景物有天趣。

趣者,存乎一心,大凡让人心生快意、心旷神怡的,都莫不有趣。

有趣的人,对生活抱有大爱。

有时,即便身处逆境,他们也能过得兴致盎然;即便眼前满是苟且,他们也总能找到诗和远方。

苏轼就是个十足有趣的人。

被贬官后,他没有愁肠百结,而是发现了生活的真和趣。

在黄州,他把“价钱如泥土”“贵者不肯吃,贫者不解煮”的猪肉,做成了色、香、味俱全的“东坡肉”,并撰文《猪肉颂》,讲述烧制心得。

有趣的人,有着强烈的好奇心。

因为万般好奇,凡事都想探个究竟、弄个明白,自然就能找到常人一般难以发现的趣和乐。

清人沈复在《浮生六记》中写道:“余忆童稚时,能张目对日,明察秋毫。

见藐小微物,必细察其纹理,故时有物外之趣。

”他笔下的文字也是妙趣横生,比如,“一日,见二虫斗草间,观之正浓,忽有庞然大物拔山倒树而来,盖一癞虾蟆也,舌一吐而二虫尽为所吞。

余年幼,方出神,不觉呀然惊恐。

神定,捉虾蟆,鞭数十,驱之别院。

”如此趣味盎然的文字,若非有趣之人,肯定抓耳挠腮、冥思苦想也写不出来。

有趣的人,深藏大智慧。

要从平淡的日子中咂摸出趣味,离不开对生活的敏锐洞察,对人情世故的深刻洞悉,对知识阅历的深厚积淀。

西藏拉萨市2020届高三第二次模拟考试理综试题含有答案

西藏拉萨市2020届高三第二次模拟考试理综试题含有答案

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拉萨市2020届高三第二次模拟考试试卷英语注意事项: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. 作答时,务必将答案写在答题卡上。

写在本试卷及草稿纸上无效。

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 _遍。

例: How much is the shirt?A. £19. 15.B. £9. 18.C. £9.15,答案是C.1. Where does the man want to go?A. A cinema.B. A bookstore.C. A candy shop.2. What does the man think of the shirt?A. It's expensive. . It feels soft. C. It's made of cotton.3. Which country did the man most recently cycle through?A. France.B. Spain.C. Switzerland.4. What are the speakers talking about?A. Ordering more bedrooms.B. Selling very large furniture.C. Displaying more computer furniture.5. What annoyed the woman?A. The film was too long.B. The seats were uncomfortable.C. The people behind were too noisy.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。

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。

每段对话或独白读两遍。

听第6段材料,回答第6、7题。

6. For what did Jackie call the man up?A. An apartment.B. A party.C. A meeting...7. Who will call the man back at about 5:00?A。

Melissa. B. Angelica. C. Simon.听第7段材料,回答第8至10题。

8・ How many years did it take the man to move up to Grade 5?A. Four.B. Five.C. Six.9. Who can go to school for more training?A. Those who learn quickly.B. Those who are above Grade 5.C. Those who pass the training test.10. How does the man feel about the woman's suggestion?A. Disappointed.B. Uninterested.C. Excited.听第8段材料,回答第11至13题。

11. What does Tim enjoy most about his job?A. Sorting out all the details.B. Getting to know the musicians.C. Listening to lots of good music.12. What do young musicians need to do before taking the course?A. Fill in an online form.B. Perform at a high level.C. Speak English very well.13. What does Tim say about the place for the course?A。

It is especially designed for musicians.B. It is convenient for public transport.C. It is in the middle of the countryside.听第9段材料,回答第14至16题。

14. When can the man register for the race?A. At 9 am.B. At 9 : 30 am.C. At 10 am.15. What is the prize if a team raises £1,500?A. A tournament T-shirt.B. A present worth £35.C. A trip to Hong Kong,16. What will the man do next?A. Give his team a name.B. Choose a team captain.C. Talk to his parents.听第10段材料,回答第17至20题。

17. How long will the festival last?A. About one month.B. About two weeks.C. About three weeks.18. Which place will be used for the first time this year?A. The Gifford Road Cinema.B. The Riverside Arts Cent re.C. The West Park.19. What will Paul Greenwood talk about?A. Some new, prize-winning films.B. The career of Marco Rossi.C. Some leading film-makers.20. How can people get a cheaper ticket?A. By going to the box office in person.B. By phoning 0735 269901.C. By paying online.第二部分阅读理解(共两节,满分40分)第一节(共15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四个选项中,选出最佳选项。

AGuide to what's worth watchingI Feel BadDon't let the depressing name of the show mislead you. Based on the novel I Feel Bad: All Day. Every Day. About Everything, this new half-hour situation comedy finds humor in the endless small failings of its heroine(女主角)——a working mom in her 40s who depends on her parents for child-care help when she escapes her chaotic family life to manage an all-male team of much younger video-game developers. Sarayu Blue stars. Wednesday, Sept. 19 , at 10P.m. , NBC.Dead LuckyAmong plenty of imported police crime dramas, Dead Lucky has one major edge: It has Rachel Griffiths as its lead. The Golden Globe-winning Australian actress plays a moody but gifted detective, whose pursuit (追捕)of a killer leads into corners of Sydney new to most American viewers. That, and co-star Brooke Satchwell, might be enough. Thursday, Sept. 20. Sundance. Now.Art in the Twenty-First CenturyDo you suffer from dandruff-like (如同有头屑一样的)symptoms when faced with contemporary art? The series that's long been a cure for such head-scratching returns with new episodes that will focus on innovative artists in Johannesburg, Berlin, and the San Francisco Bay Area, and on how place shapes the artists’ work. Friday, Sept. 21, at 9p. m., PBS.ManiacPsychological dark comedies seem to be trending this fall. In this 10-part series, Emma Stone and Jonah Hill co-star as unhappy strangers who develop a deep connection when they both volunteer for a drug trial. Saturday, Sept. 22, Netflix.21. What can be learned about the program that is aired on NBC?A. It is an amusing series.B. It is based on a true story.C。

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