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山东省2019版高二上学期开学化学试卷
山东省2019版高二上学期开学化学试卷姓名:________ 班级:________ 成绩:________一、选择题 (共15题；共31分)1. （2分）下列说法正确的是（）A . 在酒精灯加热条件下，Na2CO3、NaHCO3固体都能发生分解B . Fe（OH）3胶体无色、透明，能发生丁达尔现象C . H2、SO2、CO2三种气体都可用浓硫酸干燥D . Na2O和Na2O2投入水中都能生成NaOH，都是氧化还原反应，它们都是碱性氧化物2. （2分）下列说法正确的是（）A . 纯水导电性很差，所以水不是电解质B . 判断某化合物是否为电解质，应看其在一定条件下能否电离C . 酸、碱和盐类都属于电解质，其他化合物都不是电解质D . NaCl和HCl都是电解质，所以它们熔融状态下都能导电3. （2分） (2016高一上·武城期中) 下列说法中正确的是（）A . 0.1m ol•L﹣1的NaCl溶液中，Na+与Cl﹣离子总数为0.2NAB . 标准状况下，2.24L水的质量是1.8gC . 16gO3比16gO2所含的氧原子数多D . 22gCO2与标准状况下11.2L Cl2含有相同的分子数4. （3分） (2016高一上·济南期中) （多选）设NA表示阿伏伽德罗常数的值，下列说法正确的是（）A . 5.6 g Fe和足量的氯气完全反应失去电子数为0.3NAB . 0.1molNa2O2固体与足量的H2O充分反应，转移0.2NA个电子C . 常温常压下，23 g NO2和N2O4的混合气体一定含有NA个氧原子D . 标况下，4.48L的水中含有H2O分子的数目为0.2NA5. （2分）实现下列变化，必须要加入还原剂的是（）A . Cl2→HClOB . Fe→FeCl3C . NaI→AgID . MnO4﹣→Mn2+6. （2分） (2018高三上·曲阜期中) 某试液中只可能含有K+、NH4+、Fe2+、Al3+、Cl-、SO42-、CO32-、A1O2-中的若干种离子，离子浓度均为0.1 mol·L-1 ，某同学进行了如下实验: 下列说法正确的是（）A . 原溶液中存在NH4+、Fe2+、Cl-、SO42-B . 滤液X中大量存在的阳离子有NH4+、Fe2+和Ba2+C . 无法确定沉淀C的成分D . 无法确定原试液中是否含有Al3+、Cl-7. （2分） (2016高二上·淮阳开学考) 实验条件的控制是化学实验最为重要的方法之一，以下实验过程中实验条件控制中不合理的是（）A . 铁粉与水蒸气反应过程中应先加热制备水蒸气，再加热铁粉B . 侯氏制碱法中向饱和食盐水中应先通入足量NH3 ，再通入CO2C . 向包有Na2O2的脱脂棉花上滴水以观察到“生火”现象，滴的水应该尽量多D . Fe（OH）3胶体制备实验中向沸水滴入FeCl3溶液应是饱和溶液，并且滴入的用量仅为几滴8. （2分）下列说法正确的是（）A . H2O和H2O2中的化学键类型完全相同B . N2的结构式为N﹣NC . 一个D216O分子所含的中子数为10D . NaCl的电子式为9. （2分） (2017高一上·上海期末) 下列电离方程式书写错误的是（）A . H2SO4→2H++SO42﹣B . NaHCO3→Na++HCO3﹣C . KClO3→K++Cl﹣+3O2﹣D . HAc⇌H++Ac﹣10. （2分） (2016高三上·吉安期中) 硅酸铜钡是利用最新科学技术才合成的一种物质，然而科学家惊奇发现，我国秦朝兵马俑的一种颜料竟是硅酸铜钡．由以上事实推测关于硅酸铜钡的说法不正确的是（）A . 难氧化B . 难溶于水C . 属于硅酸盐D . 属于混合物11. （2分） (2016高一上·吉安期中) 能用H++OH﹣=H2O来表示的化学反应是（）A . 氢氧化镁和稀盐酸反应B . 澄清石灰水和稀硝酸反应C . Ba（OH）2溶液滴入硫酸铜中D . 二氧化碳通入澄清石灰水中12. （2分） (2018高三上·邢台开学考) 7瓶分别含有Cu2＋、Fe3＋、Al3＋、Mg2＋、Fe2＋、NH 、Na＋等离子的溶液，只用一种试剂即可鉴别，该试剂是（）A . KMnO4溶液B . KSCN溶液C . NaOH溶液D . NH3·H2O溶液13. （2分）(2016·浦东模拟) 常温下、某无色溶液大量存在下列H+、Na+、Fe3+、Ba2+、OH﹣、NO 、SO、CO 离子中的三种，且离子的物质的量相等．向其中滴加酚酞试液不变红色，该溶液中一定不含（）A . NOB . SOC . Na+D . H+14. （2分） (2018高二下·盐城期末) 下列说法正确的是（）A . Na2CO3溶液蒸干并灼烧可得无水Na2CO3B . 铁件表面镀锌时，铁件与外电源正极相连C . 铅蓄电池充电时，阴极质量减少，阳极质量增加D . 铜的金属活泼性比铁的差，可在海轮外壳上装若干铜块以减缓其腐蚀15. （2分）下列物质间的转化在给定条件下能实现的是（）A . Cu CuO Cu（OH）2B . Fe2O3 FeCl3溶液 Fe2O3C . Mg（OH）2 MgCl2（aq） MgD . Na Na2O Na2CO3二、解答题 (共8题；共53分)16. （9分） (2015高三上·潍坊期末) CO、CO2是火力发电厂释放出的主要尾气，为减少对环境造成的影响，发电厂试图采用以下方法将其资源化利用，重新获得燃料或重要工业产品．（1）CO与Cl2在催化剂的作用下合成光气（COCl2）．某温度下，向2L的密闭容器中投入一定量的CO和Cl2，在催化剂的作用下发生反应：CO（g）+Cl2（g）⇌COCl2（g）△H=a kJ/mol反应过程中测定的部分数据如下表：t/min n （CO）/mol n （Cl2）/mol0 1.200.6010.9020.8040.20①反应0～2min末的平均速率v（COCl2）=________mol/（L∙min）．②在2min～4min间，v（Cl2）正________ v（Cl2）逆（填“＞”、“=”或“＜”），该温度下K=________③已知X、L可分别代表温度或压强，图1表示L一定时，CO的转化率随X的变化关系．X代表的物理量是________；a________0 （填“＞”，“=”，“＜”）．（2）在催化剂作用下NO和CO转化为无毒气体，2CO（g）+2NO（g）⇌2CO2（g）+N2（g）△H=﹣748kJ•mol﹣1①一定条件下，单位时间内不同温度下测定的氮氧化物转化率如图2所示．温度高于710K时，随温度的升高氮氧化物转化率降低的原因可能是________．②已知：测定空气中NO和CO含量常用的方法有两种，方法1：电化学气敏传感器法．其中CO传感器的工作原理如图3所示，则工作电极的反应式为________；方法2：氧化还原滴定法．用H2O2溶液吸收尾气，将氮氧化物转化为强酸，用酸碱中和滴定法测定强酸浓度．写出NO与H2O2溶液反应的离子方程式________（3）用CO和H2可以制备甲醇，反应为CO（g）+2H2（g）⇌CH3OH（g），以甲醇为燃料，氧气为氧化剂，KOH溶液为电解质溶液，可制成燃料电池（电极材料为惰性电极）若电解质溶液中KOH的物质的量为0.8mol，当有0.5mol甲醇参与反应时，电解质溶液中各种离子的物质的量浓度由大到小的顺序是________17. （7分） (2018高一上·北京期中) 在Na＋浓度为0.5 mol/L的某澄清溶液中，还可能含有下表中的若干种离子。
19学年上学期高二开学考试英语试题(附答案)
四川省棠湖中学2018-2019学年高二上学期开学考试英语试题第I卷选择题（100分）（考试说明：满分150分，考试时间120分钟）第一部分听力（共两节，满分30分）第一节（共5小题，每小题1.5分，满分7.5分）请听下面5段对话，选出最佳选项。
每段对话仅读一遍。
1. What does the woman want to do?A. Look after her daughter.B. Buy her daughter some clothing.C. Wait her daughter in the department.2. What season is it now?A. Spring.B. Summer.C. Autumn.3. How does the man go to work?A. By car.B. By bus.C. By bicycle.4. Which program does the woman want to watch?A. A movie.B. A fashion show.C. International news.5. What does the woman want to buy?A. A basket.B. Some pineapples.C. Some apples.第二节（共15小题；每小题1.5分，满分15分）请听下面5段对话或独白,选出最佳选项。
每段对话读两遍。
请听第6段材料，回答第6、7题。
6. What did the man do?A. He bought some CDs.B. He met a close friend.C. He went to a concert.7. How does the woman feel about the man?A. Enthusiastic.B. Lucky.C. Crazy.听第7段材料，回答第8、9题。
2019学年安徽省高二上入学测试英语卷【含答案及解析】
2019学年安徽省高二上入学测试英语卷【含答案及解析】姓名___________ 班级____________ 分数__________一、阅读理解1. As one of the world’s oldest holidays, Halloween is still celebrated today in several countries around the globe, but it is in North America and Canada that it maintains its highest level of popularity. Every year, 65% of Americans decorate their homes and offices for Halloween. Halloween is the holiday when the most candy is sold and is second only to Christians in terms of total sales.AustriaIn Austria, some people will leave bread, water and a lighted lamp on the table before retiring on Halloween night. The reason for this is that it was once believed such items would welcome the dead souls back to earth on a night which for the A ustrians was considered to be brimming(溢)with strong cosmic energies.BelgiumThe Belgians believe that it is unluck y for a black cat to cross one’s path and also unlucky if it should enter a home or travel on a ship. The custom in Belgium on Halloween night is to light candles in memory of dead relatives.CanadaModern Halloween celebrations in Canada began with the arrival of Scottish and Irish immigrants in the 1800s. Jack- O- Lantern is carved and thefestivities include parties, trick-or-treating and the decorating of homeswith pumpkins and corn stalks.FranceUnlike most nation of the world, Halloween is not celebrated by the French in order to honor the dead and departed ancestors. It is regarded as an “American” holiday in France and was unknown in the country until around 1996.1. In which countries does Halloween have its highest level of popularity?A. France and North America .B. Canada and North America .C. Austria and Canada .D. Belgium and Canada .2.Why will people leave bread, water and a lighted lamp on the table inAustria?A. These items would welcome the dead souls back to earthB. These items are used to respect ancestorsC. These items are just for funD. The other items can replace them3.In which country does Halloween is not celebrated as the others?A. Canada .B. Belgium .C. Austria .D. France .2. For more than twenty years scientists have been searching for signs of lifeon other planets. Most of these searches have been done over the radio. Thehope is that someone in outer space may be trying to get in touch with us. Scientists also have sent radio and television messages on spaceshipstraveling through space, on the chance that someone may be receptive （善于接受的） to such messages.Scientists are using powerful radio telescope to listen to signals from about 1,000 stars, all within 100 light yearsof earth. In addition, they will scan (扫视) the entiresky to “listen” for radio messages from more distant stars. Using a computer, they will be able to monitor more than eight channels at one time. Scientists are looking for any signal that stands out from the background noise.Of the 200 billion stars in the Milky Way galaxy （银河星系）, scientists find that five percent are like our sun. Perhaps half of them have a planet like earth. Such aplanet would be a reasonable distance from the star for temperatures to be right for the evolution of life. Basedon the inhabitable (that can be lived in) planets in our galaxy, most scientists agree that chances are likely thatone or more of these planets support some life.However, many scientists wonder whether intelligent （有智力的）life exists on other planets. Some believe that twenty years of searching without any intelligible （可理解的） messagesshows that no one is out there. They say that theevolution of intelligence comparable to ours is unlikely.Other scientists believe that our search hasn’t been long enough to rule out the possibility that intelligent life exists in our galaxy. Although our sun family in only about five billion years old, our galaxy is about 20 billions years old. In that time, some scientists think it is likely that civilizations are much more advanced than ours. Perhaps these civilizations send us no signals; perhaps we have not recognized the signals they have sent us. If we hope to find intelligent life, these scientists believe that we have to keep looking.1.According to the passage, how many planets in our galaxy might human beings live?A. 5 billionB. 10 billionC. 15 billionD. 200 billion2.The first paragraph in this passage is mainly about ______.A. where scientists are looking for signs of life onother planetsB. why scientists are looking for signs of life on other planetsC. how scientists are looking for signs of life on other planetsD. when scientists are looking for signs of life on other planets3. The underlined word “monitor” in the passage means “______”.A. findB. followC. studyD. form4. Which of the statements is TRUE based on the information in the passage?A. The earth is one of the oldest planets in our galaxy.B. Most scientists believe that there is intelligent lifeon other planet.C. Scientists don’t believe that there might be life on other planets.D. Scientists are trying different ways to find signs of life on other planet.3. Drinking more than two alcoholic drinks daily in middle-age may raise your stroke( 中风 ) risk more than traditional factors such as high blood pressure and diabetes（糖尿病）, according to new research in the American Heart Association journal Stroke.In a study of 11,644 middle-aged Swedish twins who were followed for 43 years, researchers compared the effects of an average of more than two drinks daily ("heavy drinking") to less than half a drink daily ("light drinking").The study showed that:·Heavy drinkers had about a 34 percent higher risk of stroke compared to light drinkers.·Mid-life heavy drinkers (in their 50s and 60s) werelikely to have a stroke five years earlier in life irrespective of genetic and early-life factors.·Heavy drinkers had increased stroke risk in their mid-life compared to well-known risk factors like high blood pressure and diabetes.·At around age 75, blood pre ssure and diabetes appeared to take over as one of the main influences on having a stroke.Past studies have shown that alcohol affects stroke risk,but this is the first study to pinpoint differences with age. "We now have a clearer picture about these riskfactors----how they change with age and how the influence of drinking alcohol shifts as we get older," said PavlaKadlecová, M.Sc., a statistician at St. Anne's University Hospital's International Clinical Research Center in the Czech Republic.Researchers analyzed results from the Swedish Twin Registryof same-sex twins who answered questionnaires in 1967-1970.All twins were under age 60 at the start. By 2010, the Registry had provided 43 years of follow-up, includinghospital discharge(出院) and cause of death data.Researchers then sorted(整理) the data based on strokes, high blood pressure, diabetes and other cardiovascular (心血管)incidents. Almost 30 percent of participants had a stroke. They were categorized(将……分类) as light, moderate, heavy or non-drinkers based on the questionnaires. Researchers comparedthe risk from drinking and health risks like high blood pressure, diabetes and smoking. Among identical twin pairs, siblings(兄弟姐妹) who had a stroke drank more than their siblings who hadn't had a stroke, suggesting that mid-life drinking raises stroke risks regardless of genetics and early lifestyle.The study is consistent (一致)with the American Heart Association's recommended limit of two drinks a day for men and one for women. That's about 8 ounces of wine for a man and 4 ounces for a woman.Regular heavy drinking of any kind of alcohol can raise blood pressure and cause heart failure or irregular heartbeats over time, in addition to strokeand other risks. "For mid-aged adults, avoiding more than two drinks a daycould be a w ay to prevent stroke in later productive age ," Kadlecová said.1.Who might be the target readers of the passage?A. People who have suffered a strokeB. People who like drinkingC. People who have high blood pressureD. People who have twin siblings2.What do we know about the study in the passage?A. It revealed five related resultsB. It lasted for a period of over 50 yearsC. It involved the age factor in the causes of strokesD. It included 11,644 Australian twins as participants3. The underlined part “irrespective of” in the passage can best bereplaced by “_________”.A. in favor ofB. in terms ofC. instead ofD. regardless of4. What does the passage mainly tell us?A. People without a stroke can drink more alcohol than those having a stroke in middle ageB. There is a higher possibility that heavy drinkers will have a stroke in middle ageC. Drinking alcohol has been regarded as the most dangerous factor in strokesD. The amount of alcohol taken by men should be twice than that taken by women.4. We thought we had it all—a beautiful house, three healthy children and one more on the way, two cars ---- and we loved it. We spent money like it wasgoing out of style. Then, the market turned and my husband’s job as abigwig(大人物) at a construction company was gone. The company was closingdown for ever.We both started looking for jobs right away, but there weren’t any to be found. With each passing day our panic increased and we continued to work together in order topull our family through. The more we pulled together, the closer we got. I felt feelings of great love for my husband that I hadn’t felt in years. ①That’s why it was so hard for me to watch him blame himself for our present situation. I knew that he had no control over the economy, however, he constantly degraded (降低…身份)himself and his spirit sunk lower with each unkind comment. I continually asked him to stop, but he seemed to want to punish himself for not having a job. ②Finally one afternoon I pulled him aside and said, “We have four healthy children. That’s what’s important. That makes you a rich man.”“But what if we lose the house? They’ll hate me—you’ll hate me.” he replied.I smiled at him and put my hands on both sides of his face to m ake him look me in the eye. ③“If we live in a cardboard box on the empty placeacross the street I will be happy—as long as I have you.” I smiled again as I realized that I wasn’t saying it. Somehow, in all the struggling together I had foundthat deep love for him that I had on the day we said “I do.”I could see relief wash through him as his shoulders and neck relaxed and the tension left his body. He held me close and we were able to talk and plan and dreamtogether in a way that we hadn’t in quite some time. ④We are still struggling financially, but I consider us well-off because we have something that money can’t buy and no one can take away from us.1.In the wife’s opinion, what is important in her family?A. A beautiful house ___________________________________B. Healthy childrenC. Expensive carsD. Desirable jobs2. Which of the following agrees with the passage?A. The husband has found his jobs.B. The family has lost their house.C. The family has four children.D. They live in a cardboard box.3.Which is NOT the effect of the financial crisis towards the family?A. They spent money like it was going out of style .B. the husband wasn’t a bigwig in the company any more.C. The wife felt feelings of love for my husband.D. They realized there is something that money can’t buy between them.4.Where can we put the missing sentence “It was a turning point for us as acouple and a family.”？A. ①B. ②_________________________________C.③____________________________ D. ④二、七选五5. 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。
2019学年高二英语上学期开学考试试题新 版新人教版
亲爱的同学：这份试卷将再次记录你的自信、沉着、智慧和收获，我们一直投给你信任的目光……2019年度高二上学期开学考试英语试题第一部分:阅读理解（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，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。
ALet’s Go Science Show Times:Wednesday, November12, 2017 at 10: 00 am. Tickets: $9. 00 per person for groups of ten or more; $14. 00 for individuals. The wacky and talented Professor Smart and Dr. Knowitall join forces for an educational, entertaining, exciting experiment demonstrating the basic principals of science. During the show you and your students will learn about air pressure, figure out flight, and get a handle on the scientific method. Appropriate for Grades 1—5.The Wizard of OZ Show Times: Tuesday, December 18, 2017 at 9: 00 am. Tickets: $10. 00 per person for groups of 10 or more; $14. 00 for individuals. Follow the yellow brick road. Join in Dorothy’s adventures over the rainbow with the Tin man, Scarecrow, Lion and, of course, the Wizard himself. More excitement is created when a life-size tornado travels from the stage through the audience. Meet old friends and new in this imaginative fun filled musical. Award-winning lighting and special effects. Appropriate for all ages.Charlotte ’s Web Show Times: Thursday, December 4, 2017 at 11: 00 am & 12 noon. Tickets: $12. 00 per person for groups of 20 or more; $17. 00 for individuals. Charlotte’s Web is a beloved and memorable children’s classic that comes to life on stage in this musical story．The story is set in a Midwest country farm in the first half of the twentieth century. Meet Fern Arable, an imaginative eight-year-old farm girl, Wilbur, a small lovable pig, Charlotte, a large intellectual spider and Templeton, a lazy yet clever rat. You’re sure to fall in love.Appropriate for Grades Pre-Kindergarten — 3rd grade.1. A father with his son to see Science Show will pay______.A. $9. 00B. $18. 00C. $28.00 D. $14. 002.A boy who likes stories about wizards will watch the musical at______.A. 10: 00 amB. 12 noonC. 15: 00 pmD. 9: 00 am3.Where does the story of a little girl with several animals take place?A. On a brick road．B. On a farm．C. In a kindergarten．D. In a college library．ＢPulling heavy suitcases all day in the summer is hard work, especially when you’r e a thin 14-year-old. That was me in 1940—the youngest and smallest baggage boy at New York City’s Pennsyl vania Railway Station.After just a few days on the job, I began noticing that the other fellows were overcharging pas sengers. I’d like to join them, thinking, “Everyone else is doing it.”When I got home that night, I told my dad what I wanted to do. “You give an honest day’s work,” he said, looking at me straight in the eye. “They’re paying you. If they want to do that, you let them do that.”I followed my dad's advice for the rest of that summer and have lived by his words ever since.Of all the jobs I've had, it was my experience at Pennsylvania Railway Station that has stuck with me. Now I teach my players to have respect for other people and their possessions. Being a member of a team is a totally shared experience. If one person steals, it destroys trust and hurts everyone. I can put up with many things, but not with people who steal. If one of my players were caught stealing, he'd be gone.Wheth er you’re on a sports team, in an office or a member of a family, if you can’t trust one another, there’s going to be trouble.4. What can be inferred about the baggage boys?A. They could earn much, but they had to work hard.B. Many of them earned money in a dishonest way.C. They were all from poor families.D. They were all thin, young boys.5. What does the father's advice imply（暗示）?A. It is wrong to give more pay to the passengers.B. Don’t believe them if they are paying you more.C. Don’t fol low others to overcharge the passengers.D. It is difficult to work hard and live as an honest boy.6. The writer can't put up with stealing because he thinks that ______.A. it is a totally shared experienceB. it is considered as the most dangerousC. it does great harm to human relationshipD. it may lead to the loss of his sports team7. It can be concluded from the text that ______.A. his father's advice helped him to decide which job to take upB. working in the sports team was his most important experienceC. he learnt much from his shared experience with his team membersD. his experience as a baggage boy had a great influence on his later lifeCGreat white sharks! Just hearing that name makes many people’s hair stand on end. In reality, these big fish have more to fear from us than we do from them. For many years, people killed countless great white sharks in the waters around the United States.But thanks to conservation (保护) efforts, great whites are making a comeback in the U.S. Two recent studies show that the population of these sharks is rising along the east and west coast.Why is the growing population of a killer fish something to celebrate? “When you fish too many of them, you start to lose balance in the environment,” says shark researcher Tobey Curtis. As the biggest killer, sharks help keep the populations of fish, seals, and other creatures they eat from growing too large.In spite of their importance, great white sharks had long been hunted for theirmeat and their fins (鳍). Then, in 1997, the U.S. government passed a law that didn’t allow the hunting of great whites. Afterwards, the numbers of these sharks in the U.S. waters started to increase.The law wasn’t the only thing that has helped great whites. Conservationist s have also played a part in the sharks’ comeback. The research group OCEARCH is using a method called tagging (加标签) to help change people’s attitudes about great white s. They let the public follow each shark as it travels the world’s oceans. OCEARCH also gives each tagged shark a name to help people form a closer connection with the big fish.The group’s most well-known shark is named Katharine. She was tagged last year near Cape Cod, Massachusetts. Since then, thousands of people have tracked（追踪）Katharine’s movements on Twitter and the OCEARCH website.This helps people see sharks in a new way. Chris Fischer, the founder of OCEARCH believes learning to appreciate great whites will encourage people to do more to protect them.8．The underlined part “makes many people’s hair stand on end” in Paragraph 1 can best be replaced by______.A. worries many peopleB. bores many peopleC. frightens many peopleD. interests many people9．The law passed in 1997 ______.A. seemed very helpfulB. let scientists downC. needed to be changedD. made people like great whites10．Katharine’s example is used to show that ______.A. great whites are in fact lovely animalsB. the OCEARCH website has a lot of visitorsC. the number of great whites is growing quicklyD. OCEARCH help people get closer to great whites11．The main purpose of the passage is to ______.A. introduce an experiment resultB. make an advertisement for OCEARCHC. remind us that big killers are dying outD. inform us that great whites are making a comebackDHave you ever run into a careless cell phone user on the street? Perhaps they were busy talking, texting or checking updates on WeChat without looking at what was going on around them. As the number of this new “species” of human has kept rising, they have been given a new name—phubbers（低头族）.Recently, a cartoon created by students from China Central Academy of Fine Arts put this group of people under the spotlight. In the short film, phubbers with various social identities(身份) bury themselves in their phones. A doctor plays with his cell phone while letting his patient die, a pretty woman takes selfie（自拍） in front of a car accident site, and a father loses his child without knowing about it while using his mobile phone. A chain of similar events eventually leads to the destruction of the world.Although the ending sounds overstated（夸大）, the damage phubbing can bring is real.Your health is the first to bear the effect and result of it. “Constantly bending your head to check your cell phone could damage your neck,” Guangming Daily quoted doctors as saying. “The neck is like a rope that breaks after long-term stretching.” Also, staring at cell phones for long periods of time will damage you r eyesight gradually, according to the report.But that’s not all. Being a phubber could also damage your social skills and drive you away from your friends and family. At reunions with family or friends, many people tend to stick to their cell phones while others are chatting happily with each other and this creates a strange atmosphere, Qilu Evening News reported.It can also cost you your life. There have been lots of reports on phubbers who fell to their death, suffered accidents, and were robbed of their cell phones in broad daylight.12．For what purpose does the author give the example of a cartoon in Paragragh2?A. To inform people of the bad effects of phubbing.B. To advertise the cartoon made by students.C. To indicate the world will finally be destroyed by phubbers.D. To warn doctors against using cell phones while treating patients. 13．Which of the following is NOT a risk a phubber may have?A. His social skills could be affected.B. His neck and eyesight will be gradually harmed.C. He will cause the destruction of the world.D. He might get separated from his friends and family.14．Which of the following may be the author’s attitude towards phubbing?A. Supportive.B. Opposed.C.Neutral（中立）D. Objective（客观）15．What may the passage talk about next?A. Advice on how to use a cell phone.B. People addicted to phubbing.C. Measures to reduce the risks of phubbing.D. Consequences（后果）of phubbing.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。
江苏省2019届高二上学期入学测试数学试题
高二入学测试数学试题说明：1．试卷分第I卷和第II卷，满分150分，时间120分钟．2．将第I卷和第II卷的答案填涂在答题卡相应的答题栏内．第I卷（选择题，共60分）一、选择题：本大题共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．已知x1，x2，…，x n的平均数为10，标准差为2，则2x i -1，2x2 -1，…，2x n -1的平均数和标准差分别为( )A．19和2 B．19和4 C．20和2 D．20和42．在三棱锥的六条棱中任意选择两条，则这两条棱是一对异面直线的概率为( ) A．B．C．D．3．函数的最小正周期为π，若其图象向左平移个单位后得到的函数为奇函数，则函数f(x)的图象( )A．关于直线x=一对称B．关于点对称C．关于点对称D．关于直线x= 对称4．满足条件a=4，b=5，A=45°的△ABC的个数为( )A． 1 B． 2 C．无数个不存在5．已知向量，向量，则的最大值与最小值的和为( )A ．4 B．4C．16 D．4+46．已知△ABC的内角A、B、C的对边分别a，b，c，已知a= ，c=2，cosA= ，则b 的值为( )A．B．C．2 D．37．在△ABC中，角A、B、C的对边分别为a，b，c，且其面积则角C的度数为( )．A．B．C．D．8．在△ABC中，角A、B、C所对的边分别为a、b、c，且b2+ c2= a2+ bc. 若sinB·sinC=sin2A，则△ABC的形状是( )A．等腰三角形B．等边三角形C．直角三角形D．等腰直角三角形9．已知．则的值等于( )A．B．C．D．10. tan10°tan 20°+ tan 20°tan 60° + tan 60° tan10° = ( )A, 1 B. 2 C, tan10° D. tan20°11.设，不等式8x2一(8 sin a)x+cos2a≥0对x∈R恒成立，则a的取值范围为( )A．B．C．D．12．定义向量一种运算“”如下：对任意的令，下面错误的是( )A．若与共线，则B．C．对任意的，有D．第II卷（非选择题，共90分）二、填空题：本大题共4小题，每小题5分，共20分．13．在平行四边形ABCD中，O是两对角线AC，BD的交点，设点集S={A，B，C，D，O}，向量集合T={|M，N∈S，且M，N不重合} ，则集合T中元素的个数为．14.利用随机模拟方法计算y=x2与y=4围成的面积时，先利用计算器产生两组[0，1]区间上的均匀随机数a l=RAND，b1=RAND，然后进行平移与伸缩变换a=4a1-2，b= 4b1．试验进行了100次，前98次中，落在所求面积区域内的样本点数为65,己知最后两次试验的随机数为(0.3，0.08)，(0.4，0.3)，那么本次模拟得到的面积的近似值为（保留小数点后两位）．15．己知=3，=4，与的夹角为60°，则与的夹角余弦值为．16.在△ABC中，角A，B、C所对的边分别为a，b，c，其中a=2，c=3，且满足(2a-c) cosB=bcosC，则= .三，解答题：本大题共6小题，共70分．解答应写出文字说明，证明过程或演算步骤．17.化简(1)(2)18．若点(p，q)，在|p|<3，|q|≤3中按均匀分布出现．(1)点M(x，y)横、纵坐标分别由掷骰子确定，第一次确定横坐标，第二次确定纵坐标，则点M(x，y)落在上述区域的概率？(2)试求方程x2 +2 px - q2 +1=0有两个实数根的概率．19,某中学团委组织了“弘扬奥运精神，爱我中华”的知识竞赛，从参加考试的学生中抽出60名学生，将其成绩（均为整数）分成六段[40，50)，[50，60)，…，[90，100]后画出如下部分频率分布直方图．观察图形给出的信息，回答下列问题：(1)求第四小组的频率，并补全这个频率分布直方图：(2)估计这次考试的及格率(60分及以上为及格)和平均分；(3)从成绩是[40，50)和[90，100]的学生中选两人，求他们在同一分数段的概率。
2019-2019学年高二语文上学期开学考试试题(新版)新人教版
2019学年度第一学期高二开学考试语文试题本试卷分第Ⅰ卷（阅读题）和第Ⅱ卷（表达题）两部分。
满分150分。
考试用时150分钟第Ⅰ卷阅读题一、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。
增加古诗文背诵不是负担是捷径①新修订的高中课程标准增加了古诗文的背诵篇目，由过去的14篇增加到了72篇。
有声音说，这为学生增加了很大负担。
其实如果概览之前的语文教育经验，背诵并不能以负担论之，反而有审美享受的作用，甚至可以算一种学习的“捷径”。
②从现代语文教育本身看，背诵篇目增加的幅度很大，但若与中国古代语文教育及民国时期的私塾教育相比，则要求背诵的篇目仍然是很少的。
传统语文教育中，学子需要也能够背诵数十万字。
唐宋以来，为参加科举考试，考生必须将《论语》《孟子》《书经》《仪礼》《左传》等40多万字的典籍全部精读熟背。
有些人甚至背诵的更多，如顾炎武、戴震都能够将十三经全文背诵，甚至连“注”都能背诵下来。
民国时期的一些学者，接受的是传统教育，他们也都有出色的背诵功夫。
国学大师姜亮夫曾谈到，他在清华国学院时，同乐会上梁启超、王国维即兴表演节目是背诵古代文学作品，梁启超背诵一大段《桃花扇》，而王国维则当即背诵了《西京赋》。
③传统教育在背诵方面积累了丰富的经验。
这至少包括如下几点：④多感官参加背诵活动过程。
传统语文教学中，朗读本身即是多感官参加的活动，需要同时动用眼、口、耳、脑，甚至还加上头、身体的动作。
这有助于提高背诵的效率。
俄罗斯教育家乌申斯基早就指出：“参与接受某种印象或是一组印象的感觉器官越多，那么，这些印象就会越牢固地在我们的机械的和神经的记忆中扎根，同时也就会越真实地保存在记忆之中，以后回忆起来也会更加容易。
”因此，如果一个教师想使学生牢牢记住什么东西，那么他就应该注意尽可能让儿童更多的感觉器官，如眼、耳、口、肌肉运动的感觉来参加识记。
⑤最大限度发挥儿童时期听觉记忆的作用。
2019-2019学年高二数学上学期开学考试试题(新版)新人教版
2019学年度第一学高二开学考试数学试题本试卷分第I 卷和第Ⅱ卷两部分，考试时间120分钟，满分150分第Ⅰ卷（60分）一、选择题（本大题共12小题，毎小题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．已知全集U ={1，2，3，4，5}，A ={1，3}，则U A C =（ ）A ．∅B ．{1，3}C ．{2，4，5}D ．{1，2，3，4，5}2．下列函数中，既是奇函数又在（0，+∞）单调递增的是（ ）A ．x xy e e -=+ B ．()ln 1y x =+ C ．sin x y x =D ．1y x x=- 3．若3412a ⎛⎫=⎪⎝⎭，1234b ⎛⎫= ⎪⎝⎭，c =log 23，则a ，b ，c 大小关系是（ ）A ．a ＜b ＜cB ．b ＜a ＜cC ．b ＜c ＜aD ．c ＜b ＜a4．已知α为第二象限的角，且3tan 4α=-，则sin α+cos α=（ ） A ．75- B ．34- C ．15- D ．155．已知△ABC 的边BC 上有一点D 满足3BD DC =，则AD 可表示为（ ） A ．23AD AB AC =-+ B ．3144AD AB AC =+ C ．1344AD AB AC =+ D ．2133AD AB AC =+ 6．一个几何体的三视图如图，其左视图是一个等边三角形，则这个几何体的体积为（ ）A ．(43π+ B ．(86π+ C ．(83π+D ．(4π+7．设n S 为等差数列{}n a 的前n 项和，已知a 1=S 3=3，则S 4的值为（ ） A ．﹣3 B ．0 C ．3 D ．6 8．设锐角△ABC 的三内角A 、B 、C 所对边的边长分别为a 、b 、c ，且 a =1，B =2A ，则b 的取值范围为（ ）A ．B ．(C ．)2 D ．()0,29．已知变量x ，y 满足约束条件206010x y x y x -+≤⎧⎪+-≤⎨⎪-≥⎩，则2x ﹣y 的最小值是（ ）A ．2B ．﹣2C ．﹣3D ．﹣1 10．若直线220mx ny --=（m ＞0，n ＞0）过点（1，﹣2），则12m n+最小值（ ） A ．2 B ．6C ．12D ．3+211．已知函数()11x x f x e e +-=+，则满足()221f x e -<+的x 的取值范围是（ ）A ．x ＜3B ．0＜x ＜3C ．1＜x ＜eD ．1＜x ＜312．设等差数列{}n a 满足22222222272718sin cos cos cos sin sin 1sin()a a a a a a a a -+-=+，公差()1,0d ∈-，若当且仅当n =11时，数列{}n a 的前n 项和n S 取得最大值，则首项1a 的取值范围是（ ）A ．9,10ππ⎛⎫⎪⎝⎭ B ．11,10ππ⎡⎤⎢⎥⎣⎦ C ．9,10ππ⎡⎤⎢⎥⎣⎦D ．11,10ππ⎛⎫⎪⎝⎭第Ⅱ卷（90分）二、填空题（本大题共4小题，每小题5分，共20分）13．设向量()1,0a =，()1,b m =-．若()a mab ⊥-，则m = ． 14．已知1cos 123πθ⎛⎫-=⎪⎝⎭，则5sin 12πθ⎛⎫+ ⎪⎝⎭的值是 ． 15．函数f （x ）=Asin （ωx+φ）（A ＞0，ω＞0，0≤φ＜2π）在R 上的部分图象如图所示，则f （2018）的值为 ．16．已知直线l：30mx y m ++=与圆x 2+y 2=12交于A ，B 两点，过A ，B 分别作l 的垂线与x 轴交于C ，D两点，若AB =，则|CD |= ．三、解答题（本大题共7小题，共70分.解答应写出文字说明、证明过程或演算步骤）17．（10分）如图，在四棱锥P ﹣ABCD 中，∠ADB =90°，CB =CD ，点E 为棱PB 的中点． （Ⅰ）若PB =PD ，求证：PC ⊥BD ；（Ⅱ）求证：CE ∥平面PAD ．18．（12分）已知{}n a 的前n 项和24n S n n =-．（Ⅰ）求数列{}n a 的通项公式； （Ⅱ）求数列72n na -⎧⎫⎨⎬⎩⎭的前n 项和T n ．19．在平行四边形ABCD 中，设边AB 、BC 、CD 的中点分别为E 、F 、G ，设DF 与AG 、EG 的交点分别为H 、K ，设AB a =，BC b =，试用a 、b 表示GK 、AH ．20．在△ABC 中，内角A ，B ，C 所对的边分别为a ，b ，c ．已知sin cos 6b A a B π⎛⎫=- ⎪⎝⎭． （Ⅰ）求角B 的大小；（Ⅱ）设a =2，c =3，求b 和sin （2A ﹣B ）的值．21．已知方程x 2+y 2﹣2x ﹣4y +m =0．（Ⅰ）若此方程表示圆，求实数m 的取值范围；（Ⅱ）若（Ⅰ）中的圆与直线x +2y ﹣4=0相交于M ，N 两点，且坐标原点O 在以MN 为直径的圆的外部，求实数m 的取值范围．22．已知函数()•,xxf x e a e x R -=+∈.（Ⅰ）当1a =时，证明： ()f x 为偶函数；（Ⅱ）若()f x 在[)0,+∞上单调递增，求实数a 的取值范围；（Ⅲ）若1a =，求实数m 的取值范围，使()()221m f x f x ⎡⎤+≥+⎣⎦在R 上恒成立.参考答案与试题解析一．选择题（共12小题）8．【解答】解：锐角△ABC中，角A、B、C所对的边分别为a、b、c，B=2A，∴0＜2A＜，且B+A=3A，∴＜3A＜π．∴＜A＜，∴＜cosA＜，∵a=1，B=2A，∴由正弦定理可得：=b==2cosA，∴＜2cosA＜，则b的取值范围为（，）．故选：A．11．【解答】解：∵f（x）=e1+x+e1﹣x =，令t=e x，可得y=e（t+），内函数t=e x为增函数，而外函数y=e（t+）在（0，1）上为减函数，在（1，+∞）上为增函数，∴函数f（x）=e1+x+e1﹣x 的减区间为（﹣∞，0），增区间为（0，+∞）．又f（x）=e1+x+e1﹣x为偶函数，∴由f（x﹣2）＜e2+1，得f（|x﹣2|）＜f（1），得|x﹣2|＜1，解得1＜x＜3．故选：D．12．【解答】解：∵等差数列{a n}满足=1，∴精品===sin（a2﹣a7）=sin（﹣5d）=1，∴sin（5d）=﹣1，∵d∈（﹣1，0），∴5d∈（﹣5，0），∴5d=﹣，d=﹣．由S n=na1+d=na1﹣=﹣π+（a1+）n．对称轴方程为n=（a1+），由题意当且仅当n=11时，数列{a n}的前n项和S n取得最大值，∴＜（a1+）＜，解得：π＜a1＜．∴首项a1的取值范围是（π，）．故选：D．二．填空题（共4小题）13．﹣1． 14. 1315. 2 16. 415．【解答】解：由函数f（x）=Asin（ωx+φ）的部分图象知，=11﹣2=9，解得T=12，ω==；又f（0）=Asinφ=1，∴sinφ=；f（2）=Asin（×2+φ）=A，∴φ=，∴=sin=，∴A=2，∴f（2018）=f（168×12+2）=f（2）=A=2．故答案为：2．16．【分析】先求出m，可得直线l的倾斜角为30°，再利用三角函数求出|CD|即可．【解答】解：由题意，|AB|=2，∴圆心到直线的距离d=3，∴=3，∴m=﹣∴直线l的倾斜角为30°，∵过A，B分别作l的垂线与x轴交于C，D两点，∴|CD|==4．故答案为：4．三．解答题（共6小题，满分22分）17．【解答】证明：（1）取BD的中点O，连结CO，PO，因为CD=CB，所以△CBD为等腰三角形，所以BD⊥CO．因为PB=PD，所以△PBD为等腰三角形，所以BD⊥PO．又PO∩CO=O，所以BD⊥平面PCO．因为PC⊂平面PCO，所以PC⊥BD．解：（2）由E为PB中点，连EO，则EO∥PD，又EO⊄平面PAD，所以EO∥平面PAD．由∠ADB=90°，以及BD⊥CO，所以CO∥AD，又CO⊄平面PAD，所以CO∥平面PAD．又CO∩EO=O，所以平面CEO∥平面PAD，而CE⊂平面CEO，所以CE∥平面PAD．18．【解答】（Ⅰ）解：已知{a n}的前n项和，则：当n≥2时，a n=S n﹣S n﹣1=4n﹣n2﹣4（n﹣1）+（n﹣1）2=5﹣2n．当n=1时，a1=S1=3，适合上式∴a n=5﹣2n．（Ⅱ）解：令=，+…+①，所以：+…+②，①﹣②得：﹣，=，=．整理得：．19．【解答】解：如图所示，因为AB、BC、CD的中点分别为E、F、G，所以=+=+（﹣）=﹣+（﹣+）=．因为A、H、G三点共线，所以存在实数m，使=m=m（+）=m+m；又D、H、F三点共线，所以存在实数n，使=n=n（﹣）=n﹣n．因为+=，所以+n=m+因为a、b不共线，∴解得m=，即=（+）=+．20．【解答】解：（Ⅰ）在△ABC中，由正弦定理得，得bsinA=asinB，又bsinA=acos（B﹣）．∴asinB=acos（B﹣），即sinB=cos（B﹣）=cosBcos+sinBsin=cosB+，∴tanB=，又B∈（0，π），∴B=．（Ⅱ）在△ABC中，a=2，c=3，B=，由余弦定理得b==，由bsinA=acos（B﹣），得sinA=，∵a＜c，∴cosA=，∴sin2A=2sinAcosA=，cos2A=2cos2A﹣1=，∴sin（2A﹣B）=sin2AcosB﹣cos2AsinB==．21．【解答】解：（1）∵程x2+y2﹣2x﹣4y+m=0表示圆，∴△=（﹣2）2+（﹣4）2﹣4m＞0，解得m＜5，∴实数m的取值范围是（﹣∞，5）．（2）直线x+2y﹣4=0代入圆的方程，消去x可得：5y2﹣16y+8+m=0∵△＞0，∴m＜，设M（x1，y1），N（x2，y2），则y1+y2=，y1y2=，∴x1x2=（4﹣2y1）（4﹣2y2）=16﹣8（y1+y2）+4y1y2=，∵坐标原点O在以MN为径的圆的外部，精 品∴＞0，∴x 1x 2+y 1y 2＞0， ∴+＞0解得m ＞． 22． 【解答】：（1）当1a =时， ()xxf x e e -=+，定义域(),-∞+∞关于原点对称，而()()xx f x ee f x --=+=，说明()f x 为偶函数；（2）在[)0,+∞上任取1x 、2x ，且12x x <， 则()()()()()121211221212x x x x x x x x x x e e eaf x f x e aee aee +--+---=+-+=，因为12x x <，函数x y e =为增函数，得12x x e e <， 120x xe e -<，而()f x 在[)0,+∞上单调递增，得()()12f x f x <， ()()120f x f x -<， 于是必须120x x e a +->恒成立，即12x x a e +<对任意的120x x ≤<恒成立，1a ∴≤；（3）由（1）、（2）知函数()f x 在(],0-∞上递减，在[)0,+∞上递增， 其最小值()02f =，且()()22222x x x xf x e e e e --=+=+-，设x xt e e -=+，则[)2,t ∈+∞， 110,2t ⎛⎤∈ ⎥⎝⎦于是不等式()()221m f x f x ⎡⎤⋅+≥+⎣⎦恒成立，等价于21m t t ⋅≥+，即21t m t +≥恒成立， 而22211111124t t t t t +⎛⎫=+=+- ⎪⎝⎭，仅当112t =，即2t =时取最大值34，精 品- 11 - 故34m。
2019-2020学年贵州省铜仁市第一中学高二上学期入学考试语文试题
铜仁一中2019—2020学年度第一学期高二开学考试语文试卷满分：150分考试时间：150分钟一、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。
①勤劳是华夏子孙的传统美德。
中国人的劳动精神一代代传承，离不开对中国传统劳动观念的创造性转化和创新性发展。
树立正确的劳动价值观，弘扬劳动精神，是当下国人的精神追求，也是中国人建立文化自信的一个历史基点。
②人类劳动发展分为奴役劳动、谋生劳动、体面劳动、自由劳动四个阶段。
对人类社会劳动的认知和热爱，在中国古代经典着作中多有论及。
《大戴礼·武王践祚·履屡铭》中写道：“慎之劳，则富。
”强调的是财富和劳动的关系。
自古以来，对劳动的肯定和赞美都是中国传统文化的重要内容。
《古今药石·续自警篇》中写道：“民生在勤，勤则不匮，是勤可以免饥寒也。
”意思是人们的生计在于勤劳，勤劳就不会缺乏衣服与食物，勤劳能够让人避免饥饿与寒冷。
先秦儒家关注“礼制”，为中国古人构建了一种脱离田间生产的劳动价值理论；后世儒家分离了“劳”和“思”两个概念。
正如孟子所言：“劳心者治人，劳力者治于人。
”表明劳心和劳力都属于“劳”的范畴。
墨家本就是劳动者的学派，它主张“兼爱、非攻、尚贤”，建立劳动为本位的积极性劳动伦理的范式，这体现了劳动和知识的有机结合。
《墨子》中有“民有三患：饥者不得食，寒者不得衣，劳者不得息，三者民之巨患也。
”还蕴含着中国社会福利、劳动保障思想的萌芽。
佛、道两家对于劳动和农业所持的消极态度，常常遭到治国者的批评，法儒两家主张繁衍人口，认为劳动力是发展生产的根本保证，孟子曾提出“民为贵，社稷次之，君为轻”的重民思想，经过长期的文化大融合，儒、释、道、墨、法等多家思想互相渗透、互相影响，“勤于劳动”被看作是“修齐治平”的根本性的道德品质，深深滋养着一代代华夏儿女的精神心田。
③古代劳动人民的辛勤劳动创造了生活本身和精神意境，诗人妙作可窥一斑。
2019-2020年高二上学期入学考试试题 英语 含答案
万州二中高xx级高二上期入学考试英语试题2019-2020年高二上学期入学考试试题英语含答案第一部分：听力（共两节，满分30分）第一节听下面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. What will the girl be for Halloween?A. A robot.B. An alien.C. A ghost.2. What does the woman want to do?A. Get more paper.B. Recycle her paper.C. Throw out some garbage.3. What is the man’s problem?A. He is stressed.B. He can’t find his dog.C. He doesn’t like his work.4. What does the man mean?A. His clock is broken.B. He agrees with the woman.C. He listened carefully the whole time.5. Where does this conversation take place?A. At a play.B. At the movies.C. At a bar.第二节听下面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。
每段对话或独白读两遍。
听第6段材料，回答第6、7题。
6. What is true about the woman?A. She is broke.B. She lost her wallet.C. She has only $5 now.7. What does the man want the woman to do?A. Lend him some money.B. Be friends with him.C. Pay him back.听第7段材料，回答第8至10题。
[精品]2019学年高二数学上学期入学考试(8月)试题(无答案)人教、新目标版
2019学年高二数学上学期入学考试（8月）试题（无答案）一 .选择题（每小题5分，共12个小题，本题满分60分）1、数列1，37，314，321，…中，398是这个数列的（）A ．第15项B ．第14项C ．第13项D ．不在此数列中2、已知||=，||=2，.=﹣3，则与的夹角是（）A ．150°B ．120°C ．60°D ．30°3、设集合{|12},{|}.Ax x B x x a 若,AB 则a 的范围是（）A.2aB.1aC.1aD.2a4、设)0(,0)0(,)0(,1)(xx xx x f ，则)]}1([{f f f （）A ．1 B．0 C ． D ．15、方程：lg lg(3)1x x 的解为x =（）A 、5或-2 B、5 C、-2 D、无解6、直线过点 (－3,－2)且在两坐标轴上的截距相等，则这直线方程为（）A . 2x －3y ＝0;B . x ＋y ＋5＝0;C . 2x －3y ＝0或x ＋y ＋5＝0D . x ＋y ＋5或x －y ＋5＝0 7、点（2，1）到直线3x 4y + 2 = 0的距离是（）A .54 B.45C .254D .4258、在等差数列｛a n ｝中，已知a 1=2,a 2+a 3=13，则a 4+a 5+a 6等于（）A.40 .42 C.43 D.45 9、在△ABC 中，已知0120,4,6Cb a，则B sin 的值是（）A ．1957 B ．721 C ．383 D ．195710、已知正数x 、y 满足811xy，则2x y 的最小值是（）Ａ．18 Ｂ．16 C ．8 D．1011、tan 和tan()4是方程20xpx q的两根，则p 与q 的关系是（）A.10pq B. 10pq C. 10pq D.1pq12、若)()(),1,2(),4,3(b a b x aba 且,则实数x=（）A 、23 B、223 C、323 D、423二、填空题（每题5分，共20分）13、不等式21xx 的解集为。