2019-2020年高考复读中心二轮复习专题一 p训 练
2019-2020年高三第二轮复习质量检测 语文 含答案
2019-2020年高三第二轮复习质量检测语文含答案本试卷分第I卷和第II卷两部分，共9页。
满分150分。
考试用时150分钟。
考试结束后，将本试卷和答题卡一并交回。
第I卷（共36分）一、（15分，每小题3分）、1、下列词语中加点的字，每对读音相同的一组是A、同胞．/剥．离蔽．塞/庇．护所创．痛/疮．痍满目B、迸．发/蹦．跳居．中/狙．击手佝．偻/镂．骨铭心C、颔．联/翰．墨虔．诚/潜．台词恐吓．/荷．枪实弹D、颤．抖/忏．悔粘．贴/占．便宜下榻．//踏．歌而行2、下列词语中，没有错别字的一组是A、怀柔错愦鸡尾酒嬉皮笑脸B、廊清聪慧联锁店积羽觉舟C、貌像揪心唱双簧前赴后继D、陌路惊悚霓虹灯放任自留3、依次填入下列横线处的词语，最恰当的一组是①大连市位于北半球的暖温带地区，冬无严寒，夏无酢暑，四季分明，气候。
在全国宜居城市排珩榜中，位居第四。
②圆明园正值冬天，满目都是萧条景像；野草与树木，着百年洪荒的味道；斜阳和废墟，是一个世纪的倾圮荒落。
③“3.15”晚会播出后，“苹果”的售后标备受诟病。
记者对目前智能手机市场展开了一番调查，从调查结果看，该道歉的远“苹果”A、宜人弥散不止B、宜人弥漫不止C、怡人弥散不只D、怡人弥漫不只4、下列各句中，加点的成语使用正确的一句是A、国台办主任张志军以其深刻的洞察力和挥洒自如．．．．的风度博得了岛内舆论的好感，给台湾主流媒体及各界人士留下了美好的印象。
B、泰安国家高新技术开发区，交通便利，基础设施完善，政策优惠，已成为国内外大中型高新技术企业投资兴业的首善之区．．．．。
C、3月20日下午2点，贝克汉姆来到北京二中，在观看了该校足球队牛刀小试．．．．之后，上场献技，其精彩表演让在场师生大饱眼福。
D、莫言坦言，他获奖后一直冷眼旁观．．．．这段时间发生的一切，认为这是千载难缝的认识人世的机会，更是一个认清自我的机会。
5、下列名句中，没有语病的一句是A、清明假期期间，上海泗经塘、洞泾港部分水域发现大量死鱼漂浮。
2019-2020年高三第二次复习统一检测 英语 含答案
2019-2020年高三第二次复习统一检测英语含答案第一节：（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。
APioneering front-row White House journalist Helen Thomas died at age 92 after a long illness. Thomas covered 10 presidents over nearly half a century, and became a legend in the industry.She was always at White House news conferences — sitting front and center — where she frequently annoyed government spokesmen with her pointed questions.Thomas began covering the White House for United Press International when John F. Kennedy became president in 1961 and was a fixture there until her retirement in 2010.In a written statement, Obama called Thomas a "true pioneer" and said she kept the presidents she covered — including himself — on their toes.Thomas, the daughter of Lebanese immigrants, was born in Winchester, Kentucky, on August 4, 1920. She was one of nine children. Thomas was raised in Detroit, where she attended Wayne State University and graduated with a bachelor's degree in 1942.In describing her job, Thomas once said, "I've never covered the president in any way other than that he is ultimately responsible."Thomas embraced the freedoms of a columnist with vigor (活力). No question seemed off-limits for her. Colleagues remember her as a genuinely fearless woman who asked the toughest questions of presidents, no matter their party.In January 2009, as President George Bush was preparing to leave office, Thomas aimed her editorial guns at him and his administration. In a commentary, she slammed (抨击) Bush for what she considered his failings, including leading the country "into a senseless war against Iraq, a calamity still under way as he leaves office almost six years after the invasion." She considered him "the worst president ever."1. According to the text, Helen Thomas was ______.A. a wise politicianB. a writing pioneerC. a legendary journalistD. a White House adviser2. The underlined word "fixture" in Paragraph 3 probably means ______.A. an object firmly fixed in placeB. a person regarded fixed in the same positionC. someone to fix tricky problemsD. a device to secure something somewhere3. What can we learn about Helen Thomas from the text?A. She covered 10 presidents over a period of 49 years.B. She often raised unreasonable questions.C. She was born and brought up in Lebanon.D. She was criticized by President Obama.4. How did Thomas comment on George Bush?A. He should be kept on his toes.B. He was forced to be responsible.C. He didn't deserve to be president.D. He shouldn't have started the Iraq War.BEnergy drinks are as harmful as drugs and should be banned from schools, according to a British government adviser.Drinks such as Monster, Red Bull and Relentless combine sugar and caffeine (咖啡因) in such high quantities that children are becoming hyperactive (过度活跃的) and difficult to control. Some 500ml cans contain the equivalent of more than 13 teaspoons of sugar and 160mg of caffeine — which is about the same as in four cans of cola.Yesterday, government adviser John Vincent warned, "Energy drinks are effectively another form of drugs. It has a hugely damaging effect on children's ability to concentrate, how they feel and it is having health effects."Evidence from teachers and pupils is that children who drink these cans may report feeling sick, shaky and dizzy. Claire Duggan, a school public health adviser, said some children report feeling unwell after downing the drinks.Ian Fenn, headmaster of Burnage Media Arts College in Manchester, has banned the drinks following requests from staff.He told BBC, "Staff came to me and said at a school where we are very conscious about the nutritional value of what students eat. We can't allow boys to bring in drinks that are really unhealthy for them and consume not one, but two or three."Some children even choose to have an energy drink for breakfast rather than a bowl of cereal.A survey published recently found that one in 20 teenagers goes to school on a can of energy drink.A British Soft Drinks Association spokesman said, "We are clear that energy drinks are not recommended for children, and we want to get that message across to young people and parents."5. What do we know about drinks like Red Bull from the text?A. They contain about four times as much sugar and caffeine as Coca-Cola.B. They bring about health benefits as well as side effects.C. They distract children from other kinds of drinks.D. They make children more energetic and active.6. According to the text, some British schoolchildren ______.A. have energy drinks for their mealsB. feel unwell after drinking energy drinksC. are hard to control when choosing their drinksD. are aware of the nutritional value of their drinks7. What can be inferred from the text?A. Energy drinks do not affect adults at all.B. Parents request Ian Fenn to ban energy drinks.C. Bumage Media Arts College is concerned about students' health.D. All children drinking energy drinks report the same symptoms.8. The text mainly tells us that energy drinks ______.A. do as much damage as medicineB. can cause children to feel uneasyC. contain too much of nutrientsD. harm kids and should be banned from schoolsCLet's say your company has a problem and needs a creative solution. A common approach is to gather your best people in a room to brainstorm. Ideas are batted around, and, in theory, the best answer emerges.But it doesn't always work that way. Plenty of research has proven the limitations of brainstorming as members can only talk in turn. Groups tend to generate .fewer ideas than individuals.Psychologist Tony McCaffrey has a solution to our troubled search for solutions. He calls it "brainswarming", which he has trademarked. His pilot research has found that brainswarming generates more than four times as many ideas as brainstorming.A group starts with a large surface — perhaps a whiteboard — and puts a goal at the top of it.A few resources to address the problem are listed at the bottom. No talking is allowed.While it may seem silly not to talk, there are several improvements with McCaffrey's approach.There's a natural division of labor as people can focus on what they're best at. A top-down thinker might work near the top of the chart, while others may work at the bottom on thinking of potential resources. This alleviates (减轻) the inefficiency of traditional brainstorming, where the conversation is focused on a single topic.With brainswarming, those who are shy aren't as likely to get bored like in traditional conversations, where the outgoing people tend to grab the floor. All ideas stand on equal footing. Everyone can place their Post-It Notes (便利贴) on the board.Worthy ideas brought up early in a meeting won't be forgotten as a wealth of new ideas crowd the conversation later. These ideas will always be on the board, for everyone to notice and consider.9. What do people do when they brainstorm for a solution?A. They discuss common approaches.B. They propose solutions one by one.C. They select the best people to debate.D. They explore unique ways to solve the problem.10. When brainswarming, people ______.A. search for potential resourcesB. work on the same goal put on the boardC. write down their ideas and stick them on the boardD. identify each other's strengths and divide labour accordingly11. Which is NOT an advantage of brainswarming?A. It helps to raise work efficiency.B. It produces over four times as many ideas.C. It keeps all worthy ideas on the board.D. It encourages shy people to speak out.12. Which is the best title for this text?A. A Breakthrough in Marketing ScienceB. Brainswarming, the Science for Growing IdeasC. Brainswarming Has Been TrademarkedD. Brainstorming and brainswarming DifferDDear March — Come in -How glad lam -I hoped for you before ...Who knocks? That April -Lock the Door -I will not be pursued -He stayed away a Year to call -When I am occupied -But trifles look so trivial -As soon as you have come ...This lovely poem was written by Emily Dickinson, who is considered a major American poet, though she was not accorded (符合) this honor until well after her death.Emily Dickinson was born on December 10, 1830, in Amherst, Massachusetts. She attended school for only one year. Throughout her life, she seldom left her home and visitors were few. She lived in almost complete isolation from the outside world.She admired the poetry of Robert and Elizabeth Barren Browning, as well as John Keats. Though she was dissuaded (劝阻) from reading the poetry of her contemporary Walt Whitman by rumors of its disgracefulness, the two poets are now connected by the distinguished place they hold as the founders of a uniquely American poetic voice.While Dickinson was extremely prolific (多产的) as a poet, she was not publicly recognized during her lifetime. Upon her death, Dickinson's family discovered forty hand-bound volumes of nearly 1,800 poems. Her younger sister began to share the enormous body of work that Emily left behind.Emily's odd punctuation, capitalization, and formatting did not meet with standard publishing "approval" for earlier editions. There is a whimsical (古怪的) nature to many other poems, as the subject of death was the most frequent theme.13. In the poem, the poetess was speaking to ______.A. a little girlB. a long-lost family memberC. a nice seasonD. a cute animal14. What is a feature of Emily Dickinson's poems?A. They do not pay attention to rhymes.B. They resemble those of Walt Whitman.C. They have a strange format.D. They reflect her personal and social life.15. According to the text, Emily Dickinson _______.A. was completely homeschooled and had a talent for writing poemsB. was greatly influenced by four of her contemporary poetsC. is regarded as a leading poet in American literatureD. published a large number of poems during her lifetime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。
2019高考物理大二轮复完整版习题型一选择题选择题专项训练4.doc
选择题专项训练（四）（时间:20分钟满分:48分）本卷共8小题,每小题6分，共48分。
在每小题给出的四个选项屮，1帀题只有一个选项符合题目要求,6 *题有多个选项符合题目要求。
全部选对的得6分，选对但不全的得3分，有选错的得0分。
1.（2016・全国卷/）一平行板电容器两极板之问充满云母介质，接在恒压直流电源上。
若将云母介质移出，则电容器（）A.极板上的电荷量变大，极板间电场强度变大B.极板上的电荷量变小，极板间电场强度变大C.极板上的电荷量变大，极板间电场强度不变D.极板上的电荷量变小，极板间电场强度不变2.一屮子与一质量数为水/Pl）的原子核发生弹性正碰。
若碰前原子核静止，则碰撞前与碰撞后屮子的速率之比为A+1A-1A.4A（&+1）2C.3.CA FB 777777777 7777777^TT如图所示，在水平桌面上叠放着质量相等的久〃两块木板,在木板A上放着质量为刃的物块C,木板和物块均处于静止状态异、B、C之间以及〃与地面之间的动摩擦因数均为"，设最大静摩擦力与滑动摩擦力大小相等，重力加速度为马,现用水平恒力F向右拉木板A,则下列判断正确的是（）A.不管厂多大，木板〃一定保持静止B.A. C之间的摩擦力大小一定等于mgC.〃受到地面的滑动摩擦力大小一定小于FD.A.〃之间的摩擦力大小不可能等于尸4.无限大接地金属板和板前一点电荷形成的电场区域，和两个等量界种的点电荷形成的电场等效。
如图所示,P为一无限大金属板，0为板前距板为厂的一带正电的点电荷，沏V为过。
点和金属板垂直的直线，直线上畀、〃是和0点的距离相等的两点。
下面关于/I、〃两点的电场强度用和层、电势如和如判断正确的是（）M PA QB N()^-1卫+1B. (&+1)2工A.E A>E B, e,\ <（1）8B.E A >E B, Of > eC. E A >E B, e,\二如D. E A =Ef h eA > ©aB如图所示，通电直导体棒放在间距为/的光滑水平绝缘轨道上,劲度系数为斤的水平轻弹簧一端固定，另一端拴在棒的屮点，且与棒垂直，整个装置处于方向竖直向上、磁感应强度为〃的匀强磁场屮, 弹簧伸长禺棒处于静止状态。
2019-2020学年度高三高考数学二轮复习专题训练+22+Word版含答案
——教学资料参考参考范本——2019-2020学年度高三高考数学二轮复习专题训练+22+Word版含答案______年______月______日____________________部门1、长度为的线段的两个端点分别在轴和轴上滑动，点在线段上，且为常数且。
（1）求点的轨迹方程，并说明轨迹类型；P C（2）当时，已知直线与原点的距离为，且直线与轨迹有公共点，求直线的斜率的取值范围。
1l k解：（1）设、、，则，由此及，得，即；(,)P x y 0(,0)A x 0(0,)B y 0000(1)1()x xx x x AP PB y y y y y λλλλλλ=+⎧-=-⎧⎪=⇒⇒⎨⎨+=-=⎩⎪⎩22200||AB a x y a =⇒+=[]2221(1)x y a λλλ⎡⎤+⎛⎫++= ⎪⎢⎥⎝⎭⎣⎦22221y a x λλ⎛⎫+=⎪+⎝⎭①当时，方程的轨迹是焦点为，长轴长为的椭圆；10<<λ)0,11(a λλ+-±a λ+12②当时，方程的轨迹是焦点为，长轴长为的椭圆；1>λ)11,0(a λλ++-±③当时，方程的轨迹是焦点为以点为圆心，为半径的圆。
（2）设直线的方程：，据题意有，即。
h kx y +=212ak h=+212k ah +=由，得，因为直线与椭圆有公共点，所以，又把代入上式得：。
⎪⎩⎪⎨⎧=++=222499a y x h kx y 04929)41(92222=-+++a h khx x k 1l 222499a y x =+,081)4(9222≥-+=∆h a k 212k ah +=535535,572≤≤-∴≤k k 2、已知椭圆经过点，两个焦点为。
C A 3(1,)2(1,0),(1,0)-（1）求椭圆的方程； C（2）是椭圆上的两个动点，如果直线的斜率与的斜率互为相反数，证明直线的斜率为定值，并求出这个定值。
F E ,解：（1）由题意，可设椭圆方程为，1,c =222211x x b b+=+ ∵在椭圆上，∴，解得，（舍）A2219114b b +=+23b =234b =- ∴椭圆的方程为。
2019-2020学年度最新高考二轮总复习英语试题Word版
2019-2020学年度最新高考二轮总复习英语试题Word版(附参考答案)英语试题第一部分听力(共两节，满分30分)该部分分为第一、第二两节。
注意：回答听力部分时，请先将答案标在试卷上。
听力部分结束前，你将有两分钟的时间将你的答案转涂到客观题答题卡上。
第一节（共5小题；每小题l. 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l0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。
例：How much is the shirt?A. £19.15B. £ 9.15C. £ 9.18答案是B。
1. What will Dorothy do on the weekend?A. Go out with her friend.B. Work on her paper.C. Make some plans.2. What was the normal price of the T-shirt?A. $15B. $30.C. $50.3. What has the woman decided to do on Sunday afternoon?A. To attend a wedding.B. To visit an exhibition.C. To meet a friend.4. When does the bank close on Saturday?A. At l:00 pm.B. At 3:00 pmC. At 4:00 pm.5. Where are the speakers?A. In a store.B. In a classroom.C. At a hotel.第二节(共15小题;每小题1 5分，满分22 .5分)听下面5段对话或独自。
每段对话或独自后有几个小题，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。
2019-2020学年度最新高三高考数学二轮复习专题训练+12+Word版含答案
2019-2020学年度最新高三高考数学二轮复习专题训练+12+Word 版含答案8、数列}{n a 的通项公式为⎪⎭⎫ ⎝⎛-=3sin 3cos 222ππn n n a n ，其前n 项和为n S 。
（1）求n S ； （2）设nnn n S b 43⋅=，求数列}{n b 的前n 项和n T 。
解：（1）由于222cos sin cos 333n n n πππ-=，故312345632313222222222()()()1245(32)(31)(3)(6)((3)))222k k k k S a a a a a a a a a k k k --=+++++++++++-+-=-++-+++-+1331185(94)2222k k k -+=+++=，3133(49),2k k kk k S S a --=-=2323131(49)(31)1321,22236k k k k k k k S S a k ------=-=+=-=--故1,3236(1)(13),316(34),36n n n k n n S n k n n n k⎧--=-⎪⎪+-⎪==-⎨⎪+⎪=⎪⎩，*k N ∈。
（2）394,424n n n nS n b n +==⋅⋅21132294[],2444n n n T +=+++1122944[13],244n n n T -+=+++两式相减得：12321991999419419443[13][13]8,12444242214nn n n n n n n n n T --+-++=+++-=+-=---故2321813.3322n n n n T -+=--⋅。
9、数列}{n a 满足}221221,2,(1cos )sin ,1,2,3,.22n n n n n a a a a a n ππ+===++=满足。
（1）求34,,a a 并求数列{}n a 的通项公式； （2）设21122,.n n n n na b S b b b a -==+++。
2019-2020学年度最新高考英语二轮复习专题训练阅读理解-docxWord版
2019-2020学年度最新高考英语二轮复习专题训练阅读理解-docxWord版(附参考答案)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。
A1. Why is it that we sometimes forget our surroundings and even our identity while reading?B. Everything is so quiet and calm around you.C. The book you are reading is so interesting and attractive.D. Your book is overdue; you are finishing it at a very fast speed.2. How would you account for the fact that people like their acquaintances in books even more?A. They resemble human friends exactly.B. They are unfamiliar types we like.C. They never desert us.D. They never hurt our feelings.3. Which of the following is true?A. Your wish to visit some far-off place can be realized through the pages of the books.B. To escape from the dull realities of everyday life you should take up reading.C. Books can always help you to live a colorful life.D. You may obtain valuable experience from reading good books.4. The word “weary” means ______.A. “to attract someone’s attention”B. “to distract someone’s attention”C. “to make someone very tired”D. “to make someone interested”5. “... the whole world is ours for the asking” implies that ____________.A. in books the world is more accessible to usB. we can ask to go anywhere in the worldC. we can make a claim to everything in this worldD. we can make a round-the-world trip free of chargeB1) Do you prefer working alone or with other people?There are isolating（使孤立）jobs that will drive an outgoing person crazy and also interactive jobs that will make a shy person uneasy. Most people are not extremes in either direction but do have a tendency that they prefer. There are also positions that2) How do you handle change?Most jobs these days have some elements of change to them, but some are more than others. If you need stability in your life, you may need a job where the changes don't happen so often. Other people would be bored of the same daily routine.4) What type of work environment do you enjoy？This can range from being in a large building with a lot of people you won't know immediately to a smaller setting where you'll get to know almost all the people there fairlyquickly.5) How do you like to get paid?Some people are motivated by the pay they get, while others feel too stressed to be like that. The variety of payment designs in the sales industry is a typical example for this.Anyway, these are a great starting point for you. I've seen it over and over again with people that they make more money over time when they do something they love. It may take you a little longer, but making a move to do what you have a passion for can change the course of your life for the better.6. Which of the following is TRUE according to the passage?A. Isolating jobs usually drive people mad.B. Interactive jobs make people shy easily.C. Extreme people tend to work with others.D. Almost everyone has a tendency in jobs.7. What does the underlined sentence in paragraph one mean?A. Before you select your job, you should assess your skills and match them with your positionB. There are more important things than assessing skills and match them with the position when you select job.C. Nothing is important than assessing skills and match them with the position when you select job.D You should ignore your skills when you select job.8. What is the missing word about a job search in the following chart?A. Design.B. Changes.C. Cooperation.D. Hobbies.9.What is the best title for this passage?A. Lifestyles and Job PayB. Jobs and EnvironmentC. Job Skills and AbilitiesD. Personalities and JobsCJack London had endured more hardships by the age of twenty-one than most people experience in a lifetime. His struggles developed in him sympathy for the working class and a lasting dislike of hard work and provided inspiration for his career as a writer.London grew up in San Francisco in extreme poverty. At an early age, he left school and supported himself through a succession of un skilled jobs ----working as a paper boy, in bowling alleys, on ice wagons, and in canneries（罐头食品厂）and mills. Despite working long hours at these jobs, London was able to read constantly, borrowing travel and adventure books from the library.Once back in California, London became determined to earn a living as a writer. He rented a typewriter and worked up to fifteen hours a day, spinning his Alaskan adventures into short stories and novels.According to legend, London’s piles of rejection slips from publishers grew to five feet in height! ell on the way of creating a new model for spreading through his Beauty Ranch when he died of kidney disease at age 40. He left over fifty books of novels, stories, journalism, and essays, many of which have been translated and continue to be read around the world. His best works describea person’s struggle for survival against the powerful forces of nature. “To Build a Fire”, for example, tells the story of a man’s fight to survive the harsh cold of the Alaskan wint er.10._________made Jack London reconsider his life in the future.A. His job experienceB. The books he readC. Being arrestedD. Long-hour work11. What is TRUE about Jack London?A. Jack London was poor all his life.B. Jack London got enough money while in the search of gold.D. The experience of gold searching made Jack London determined to write novels about Alaska adventures.12. After the experience in Alaska, Jack London ________________.A. realized the nature of human beings.B. knew people could control the nature finally.C. regretted being there.D.thought highly of himself.13. In paragraph 4, the sentence “True, the new region was mostly poor; but its several hundred thousand square miles of coldness at least gave breathing space to those who else would have choked at home.” implies_______________________________.A. Jack London regarded Alaska a poor place as he never got any gold there.B. people would have been ill at home if they had never been Alaska.C. People searching for gold there still have chance to win.D. Alaska was a poor but large region.14. Which one of following works doesn’t belong to Jack London according to the passage?A. love storiesB. poetryC. journalismD. essays15. What ca n we learn from Jack London’s final success?A. Failure is the mother of success.B. Practice makes perfect.C. Knowledge is powerful.D. All of above.DIf your preschoolers turn up their noses at carrots or celery, a small reward like a sticker for taking even a taste may help get them to eat previously disliked foods, a UK study said.Though it might seem obvious that a reward could encourage young children to eat their vegetables, the idea is actually controversial, researchers wrote in the American Journal of Clinical Nutrition. That’s because some studies have shown that rewards can backfire and cause children to lose interest in foods they already liked, said Jane Wardle, a researcher at University College London who worked on the study. Verbal praise, such as “Brilliant! You’re a great vegetable taster,” did not work as well.The study found t hat when parents gave their small children a sticker each time they took a “tiny taste” of a disliked vegetable, it gradually changed their attitudes. Th e children were also willing to eat more of the vegetables-either carrots, celery, cucumber, red pepper, cabbage or sugar snap peas-in laboratory taste tests, the study said.Researchers randomly assigned（分派）173 families to one of these groups. In one, parents usedstickers to reward their children each time they took a tiny sample of a disliked vegetable. A second group of parents used verbal praise. The third group, where parents used no special vegetable-promoting methods, served as a “control”.Parents in the reward groups offered their children a taste of the “target” vegetable every day of 12 days, Soon after, children in the sticker group were giving higher ratings to the vegetables-and were willing to eat more in the research lab, going from an average of 5 grams at the start to about 10 grams after the 12-day experience. The turnaround also seemed to last, with preschoolers in the sticker group still willing to eat more of the once disliked vegetable three months later.Why didn’t the verbal praise work? Wardle said the parents’ words may have seemed “insincere” to their children.16．The purpose of writing the passage is .A．to introduce a practical method of making children eat vegetablesB．to show the procedure of an experiment on children’s dietC．to explain why children hate to eat vegetablesD．to present a proper way of vernal praise to parents17．The underlined word “backfire”in Paragraph 2 probably means “”. A．shoot from behind the back B．make a lire in the hackyardC．produce an unexpected result D．achieve what was planned18．According to the passage, which of the following statements is true?A．Most children are born to dislike carrots or celery.B．It remains a question whether rewarding is a good way to get children to eat vegetables. C．Oral praise wokrs quite well in encouraging children to eat vegetables.D．Children in the sticker group will never lose interest in eating vegetables.19．How did the researchers get their conclusion from the experiment?B．By asking questions.C．By giving examples, D．By discussion.20．What can we learn from the last paragraph?A．Children like rewards, not verbal praise.B．Parents should praise their children in a sincere tone.C．Children are difficult to inspire.D．Parents should give up verbal praise.1234568 9 10 C C D C A D B C D C111213141516171920 D A C B D A C B A B。
2019学年高考物理大二轮复习与测试“练一练”：电路与电磁感应
(2)从释放金属杆开始计时，求外力F随时间t变化的关系式，并说明F的方向．
(3)若整个过程中，乙金属杆共产生热量Q，求外力F对甲金属杆做的功W.
2019学年高考物理大二轮复习与测试“练一练”：电路与电磁感应
一、选择题
详细信息
1.难度：中等
如图所示，水平虚线MN的上方有一垂直纸面向里的匀强磁场，矩形导线框abcd从MN下方某处以v0的速度竖直上抛，向上运动高度H后垂直进入匀强磁场，此过程中导线框的ab边始终与边界MN平行．不计空气阻力，在导线框从抛出到速度减为零的过程中，以下四个图象中可能正确反映导线框的速度与时间的关系的是()
详细信息
2.难度：中等
如图为远距离输送交流电的系统示意图，变压器均为理想变压器．随着用户负载增多，发电机F达到额定功率时，降压变压器输出功率仍然不足，用户的用电器不能正常工作．那么，在发电机以额定功率工作的情况下，为了适当提高用户的用电功率，可采取的措施是()
A．适当减小输电线的电阻r
B．适当提高
C．适当提高 的同时，降低
D．适当降低 的同时，提高
二、计算题
详细信息
3.难度：困难
如图所示，两根足够长、电阻不计、间距为d的光滑平行金属导轨，其所在平面与水平面的夹角为θ，导轨平面内的矩形区域abcd内存在有界匀强磁场，磁感应强度大小为B，方向垂直于导轨平面向上，ab与cd之间相距为L，金属杆甲、乙的阻值相同，质量均为m，甲杆在磁场区域的上边界ab处，乙杆在甲杆上方与甲相距L处，甲、乙两杆都与导轨垂直．静止释放两杆的同时，在甲杆上施加一个垂直于杆平行于导轨的外力F，使甲杆在有磁场的矩形区域内向下做匀加速直线运动，加速度大小为a＝2gsin θ，甲离开磁场时撤去F，乙杆进入磁场后恰好做匀速运动，然后离开磁场．
2019-2020学年贺兰山高考补习学校高三英语二模试卷及答案解析
2019-2020学年贺兰山高考补习学校高三英语二模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AExperts say that if food were a country, it would rank second behind theUSas one of the biggest greenhouse gas polluters. The reason is the rising demand for meat. Animal farming is responsible for 14.5 percent of global methane emissions. While cowsare the worst contributors, pigs, sheep, donkeys and other animals play a part as well.Animal agriculture also causes land to become damaged, water to be polluted and forests to get destroyed. With the world population forecast to rise to 9.8 billion by 2050, things are only looking worse for our already decreasing natural resources. While going vegetarian would help, meat consumption is too deep-rooted in most Western diets to allow for such a sharp, permanent change. That is why experts are advocating substituting some of the beef, chicken, or pork with ordinary insects!Insects, which grow into adults within a matter of months, if not weeks, are ready for consumption much faster than domestic animals. They also require much less room, use less water and food, and produce far less greenhouse gas than animals.Of the 1.1 million insect species worldwide, scientists have identified 1,700 as eatable. Among them are ants, grasshoppers, grubs, and earthworms. Just like animals, each insect has a different taste. Tree worms taste just like pork, and grubs are similar to smoked meat.While eating insects might be a new concept for Western people, over 2 billion people worldwide consume insects as a regular part of their diet. Besides being delicious, insects are high in protein, have very few calories, and are free of the saturated fat found in animal meat. Insects can be prepared in many ways. Creative cooks can use them to cook protein-rich soup, make baked treats, and even fry a few with vegetables. So eat insects--- both your body and Mother Earth will thank you for it!1. Which of the following animals contribute the most to global methane emissions?A. Sheep.B. Donkeys.C. Cows.D. Pigs.2. How is the third paragraph developed?A. By making comparisons.B. By providing examples.C. By listing data.D. By asking questions.3. What can be inferred from the last paragraph?A.Few people eat insects regularly.B. Ordinary insects are high in fat.C. Insects contain various vitamins.D. Saturated fat is harmful to health.BA study has found that a lifetime of regular exercise and activity can slow down the aging process (衰老过程). Researchers say that getting older should not necessarily mean becoming more weak or sick. Their research shows that a devotion to a life of movement and exercise may help us live not only longer, but also healthier.For their study, the researchers looked at two groups. The first group was made up of 125 non-professional cyclists between the ages of 55 to 79. This group included 84 healthy men and 41 healthy women. We will call this group the “cyclists”.Researchers then found 130 people to make up a second group. Within this group, 75 people were aged from 57 to 80. The other 55 were between the ages of 20 and 36. The people in this group were also healthy, but they did not exercise regularly. We will call this group the “non-exercisers”. Smokers, heavy drinkers of alcohol and people with other health issues were not included in the study.Then, researchers gave both groups a series of tests. They tested their muscle mass (肌肉质量), muscular strength, percentage of body fat and the strength of their immune (免疫的) systems. Then the researchers compared the results of the two groups.Results showed that the cyclists did not experience body changes usually regarded as a normal aging process. For example, they did not lose muscle mass or muscular strength. Also, their body fat did not increase with age.The researchers also found something they had not expected. The study showed that the immune systems of the cyclists did not age either.The researchers advise us all to find an exercise that we like in our lives.4. How did the researchers carry out the study?A. By comparing.B. By discussing.C. By imagining.D. By reasoning.5. Which of the following is a result of the research?A. The cyclists kept a thin body shape.B. The non-exercisers gained weight easily.C. The cyclists’ muscles remained strong with age.D. The non-exercisers usually had health problems.6. Which is an unexpected result for the researchers?A. The cyclists had normal aging process.B. The cyclists’ immune systems didn’t age.C. The cyclists lost nearly all their fat.D. Everyone needed an exercise in their lives.7. Which of the following can be the best title for the text?A. Healthy People Need More ExerciseB. Take an Exercise, the Harder, the BetterC. Cycling Is the Best Way to Prevent AgingD. A Lifetime of Exercise Slows Aging ProcessCA crew（全体成员）of six teenage girls completed a nine-day sailing trip in the US recently, after having seasickness and strong winds.For the past three years, the Sea Cadet teenagers whoset sail were all male. Roger Noakes, who captained（担任队长）the boat, said this was the first time he’d taken out an all-female crew.The girls asked for an all-girls trip in August this year. The crew set sail along with three adults, Noakes and two Sea Cadet representatives. The original plan was for the girls to sail 24 hours a day in rotating shifts（轮流换班）along the coast and then return. Things turned out differently, however. “The first night was difficult because the wind was really hard. The waves were going up and down,” said Abby Fairchild,16. “Everybody got seasick.” Noakes gave the girls the choice of just sailing in the bay and not going into open water. “But they decided they were going.”The teenagers then sailed a long way overnight and slept in shifts. “We’ve learned everything from controlling the boat to putting up the sails while we have rough seas,” said 15-year-old Olivia Wilcox.The teenagers stopped on land in Massachusetts. They didn’t make it to their original destination（目的地）in Maine, where they were supposed to have a celebratory dinner, due to the weather and winds. They said they weren’t disappointed, however, as they’d learned a lot. “They learned about boating, and above all, they built confidence and character,” said Noakes.8. What was special about the Sea Cadet trip this year?A. It was the longest sailing trip ever.B. It was the first all-female-crew sailing trip.C. It was the most dangerous sailing trip ever.D. It was the first sailing trip for teenagers.9. What happened on the crew’s first day of the trip?A. They all felt sick on the boat.B. Some of them were hurt.C. Their boat was out of control.D. They went into open water by mistake.10. Which of the following best describes these young sailors?A. Strong-minded and having a strong sense of teamwork.B. Hard-working and having great leadership skills.C. Understanding and creative.D. Adventurous and skillful.11. According to Noakes, what was the sailors’ greatest benefit from the trip?A. They knew the sea better.B. They made many friends.C. They got excellent sailing skills.D. They developed good personalities.DWhere do you find beauty? Fashion Magazines? Music Videos? One American photographer is finding beauty in unexpected places. And a new documentary about his work might help change the traditional standards of “who” is beautiful.Rick Guidotti put aside his career as a fashion photographer to turn his lens to people living with genetic, physical and behavioral differences. He says what changed his perception of beauty was a chance encounter with an albino （白化病）girl.“I was just tired of people telling me who was beautiful. Every season that face would change but I was always told who was beautiful. As an artist, I don't see beauty just on covers of magazines. I see it everywhere. So it was my initial intention that opened my eyes a little wider and wider.” Said Guidotti.Guidotti has created Positive Exposure, a not-for-profit organization that uses photography and video to transformpublic views and promote a world where differences are celebrated. Guidotti and Positive Exposure are featured in a new documentary called On Beauty.The cast and crew recently hosted a screening at Georgetown University in Washington. One of the women featured in the film is Jayne Waithera. “I never thought I was beautiful because nobody said that to me, but meeting him was my profound moment. I remember that particular day he took my picture and I felt so good like I felt there's somebody who, really loves me and sees me for who I am and who sees me more than my condition.” said Waithera.The documentary is the idea of producer Joanna Rudnick. After seeing Guidotti's photos, she decided to tell his story. Joanna and Guidotti are traveling from city to city to promote On Beauty. “As I travel from community to community, I'm taking photographs and I'm encouraging individuals with a positive sense of who they are. They're seeing beauty in their reflection but I'm also encouraging their families and they in turn are encouraging their communities as well. All is based on the philosophy of change how you see,see how you change.”12. What made Rick change his understanding of beauty?A. A girl diagnosed with albino.B. His job as a fashion photographer.C. The beauty on the covers of magazines.D. Influence from the people working with him.13. What can we infer about Jayne Waithera?A. She showed great interest in taking photos.B. She used to be disappointed at her work and life.C. She was greatly influenced by the experience with Rick.D. She believed Rick was the best photographer in the world.14. Which of the following words can best describe On Beauty?A. abstract and differentB. traditional and academicC. tolerant and encouragingD. creative and interesting15. What's the best title of the text?A. True Beauty In The Eye Of A PhotographerB. Beautiful Or Not Beautiful,That's A QuestionC. Be Who You Are Not Who You Want To BeD. A Different photographer, A Different Magazine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。
2019-2020学年贺兰山高考补习学校高三英语第二次联考试题及参考答案
2019-2020学年贺兰山高考补习学校高三英语第二次联考试题及参考答案第一部分阅读（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AKuala Lumpur is a capital city in Malaysia. Here are the top 4 budget hotels:The Chinatown Inn (About $30 per night)Just a block from the railway station, located in Chinatown’s open market. It has clean beds, central air conditioning, hot water forcoffee and tea, and a hall with a big screen TV. Wi-Fi is good except Floor 5. The guests’ complaint is that the air condition is too cold, so make sure you get a room with a window. You can open it to let some warmth in.Ancasa Express (About $45 per night).The hotel is above the sky-train station. That makes it convenient to get to other parts of the city. From the station, take the elevator to the 5th floor to reach the hotellobby(大厅). The rooms are clean and nice. There is a flat screen TV, the strongest Wi-Fi, and a very hot rainfall shower. The guests’ complaint is that the cafe is only open for breakfast and dinner, and not 24 hours.Central Hotel (About $35 per night)This hotel is just two blocks from the Central Station, which is the heart of all transportation in the city. From Central you can walk 2 blocks to the beautiful Central Hotel, in which rooms are small but clean, and have common Wi-Fi.Ocean 77 (About $25 per night)On Petaling Street in Chinatown, this brand new hotel is most spotlessly clean. There is a flat screen TV and good Wi-Fi in each room. The location is good, in the heart of the Petaling Street market. No cafe in the hotel, but many on the street.1.In the Chinatown Inn you are told to choose a room with a window ________.A.because the light in the room is dimB.so that you can breathe the fresh airC.so that you can let some warm air inD.so that you can have a good view from it2.If a guest likes surfing the Net, which of the following would be his first choice?A.The Chinatown InnB.Central Hotel.C.Ocean 77.D.Ancasa Express3.What is the unusual characteristic of Ocean 77?A.It is the cheapest, newest and cleanest.B.Its location is in the heart of the city.C.It is located in the street in Chinatown.D.There is a flat screen TV and good Wi-Fi.BWe all use different ways to remember ideas, facts and things we need to store. Remembering is an extremely important part of our learning experience. Information process, storage and recall encourage purposeful learning.But the brain doesn’t store everything we want or need for future use. It makes choices and tends to remember information that forms a memorable pattern. Things you learned recently can be particularly difficult to remember because they haven’t taken root in your mind.“Forgetting allows us to remember what is really important to our survival. We forget much of what we read, watch, and think directly every day.” writes John Medina in his book, Brain Rules.How do you avoid losing 90%of what you’ve learned? An inspiring writer and speaker Zig Ziglar once said: “Repetition is the mother of learning, the father of action, which makes it the architect of accomplishment.”Repetition has been a remembering skill for ages. When you hear or read something once，you don’t really learn it-at least not well enough to store the new information for long. The right kind of repetition can do wonders for your memory. People learn or remember better by repeating things or getting exposed to information many times. Othersrepeat particular steps or processes deliberately a number of times or even years to become better at certain skills.Daniel Coyle explains in his book, The Little Book of Talent:“...closing the book and writing a summary, even short ones, forces you to figure out the key points, process and organize those ideas so they make sense, and write them on the page. When you pick it back up weeks later, reread all of your notes or highlights to strengthen the ideas even further.”People learn by repeating things. Better learning is a repetition process. Every time we repetitively access something we already know, we increase the memory’s stored value.4. Which of the following can be inferred from the passage?A. The brain tends to store 90% of the things we learn.B. The fresher the information isthe easier to remember.C. Thinking is more important than remembering in study.D. The brain tends to choose and keep what it thinks important.5. How does the writer prove his opinion?A.By giving examples.B. By listing numbers.C. By borrowing words of experts.D. By providing scientific finding.6. What does Daniel Coyle want to say in his book?A. You can’t pay too much attention to repetition.B. Summarizing is a very effective learning tool.C. Forgetting forces human brain to make choices.D. Regular repetition helps to form good habits.7. Which do you think is the best title of the passage?A. How the Brain WorksB. Reading for MoreC. Fighting Against ForgettingD. Repeat to RememberCSleep problems in early childhood may be linked to the development of certain mental health disorders in adolescence, according to a new research.A study of 7,155 children in theUnited Kingdomfound that waking up frequently during the night and irregular sleep routines as babies and toddlers was linked to psychotic experiences in children aged 12 and 13. Also, children who slept for shorter periods at night were more likely to be associated with borderline personality disorder at ages 11 and 12.The research, published in the journalJAMA Psychiatry, was the first time possible links between early childhood sleep problems and adolescent psychotic experiences and borderline personality disorder (BPD) symptoms have been examined.“We know from previous research that persistent nightmares in children have been associated with both psychosis and borderline personality disorder,” said lead author Isabel at theInstituteofMental Healthat theUniversityofBirmingham.“But nightmares don’t tell the whole story. We’ve found that, in fact, a number of behavioral sleep problemsin childhood can point towards these problems in adolescence,” she said.Adolescence, typically defined as the ages between 10 and 19, is a key period in human development because of brain and hormonal changes, anditis now thought to be when many mental health problems start.Prior research inAustraliafound that babies with persistent severe sleep problems in their first year were at greater risk for anxiety and emotional issues in later childhood. Sleep problems in children and adolescents have been shown to predict the development of various emotional and behavioral problems, including depression, anxiety, attention-deficit hyperactivity disorder, risk-taking and aggression. However, findings have been inconsistent, especially when based on objective measurements of sleep, rather than parental reports.Sleep and mental health are closely connected in adults, with sleep problems increasing the risk for developing particular mental illnesses as well as resulting in mental health issues.8. What can we know from paragraph 3?A. Childhood sleep problems probably cause youth mental health problems.B. Severe sleep problems in childhood lead to emotional issues.C. Persistent nightmares in children are closely related to psychosis.D. The research has not been known to the public.9. What does “it” refer to in paragraph 6?A. Adolescence.B. Key period.C. Human developmentD. Hormonal change.10. According to the Australian research, older children who had long-term serious sleep issues at one year old are more likely to ________.A. grow slowlyB. develop attention-deficit hyperactivity disorderC. do badly in lessonsD. suffer from anxiety11. Which of the following can be the best title for the text?A. A Study About Childhood Sleep Problems Is Under ProgressB. Pay Attention to Children Who Lack SleepC. Childhood Sleep Issues Linked to Adolescent Mental Health ProblemsD. How to Help Children Develop a Good Sleep HabitDIs homeschooling good or bad? That is a question that many parents ask themselves. In my opinion, homeschooled kids can give reliable answers.Kayla Murray, who lives inGreensboroNorth Carolina, started homeschooling almost eight years ago, after attending two local schools. “Homeschooling is school at home,” like the name says, but it’s not just that/ she says. “You're able to learn more and do more.”Having experienced learning at both school and home, Kayla says that she prefers the latter. “With homeschooling, I can do schoolwork in my pajamas, and no one cares,” she says, “you also have more chances. Earlier this year, my family and I were able to take a short vacation and go to an air show. My siblings and I get to take the day off for our birthdays. This year, I spent that time reading and playing the piano and guitar.”There are, however,drawbacksof being homeschooled, Kayla says, especially “the lack of people”. While she doesn't miss homework, al school, she did enjoy getting to see my friends every day.”Matthew Dimmette, also fromGreensboro, used to be a homeschooler. He now attends public high school. He says being homeschooled is quite different from going to public school. The differences depend on how you arc homeschooled and the things you do. “For me, it wasn't really different in terms of the classes but the school environment was a big change atter hearting at home. says Matthew.Talking about his homeschooling experience, Matthew says the best part of it was being able to learn what he wanted to. Yet the main disadvantage was that he couldn't do many experiments in homeschooling unless taking classes at different places. “My interest in science has been growing quickly in recent years, so I chose to go to public school,” he says.12. What does Kayla like about learning at home?A. She can spend her time more freely.B. She can always stay with her siblings.C. She can play the instruments she likes.D. She can celebrate her birthday at home.13. What does the underlined word “drawbacks” in Paragraph 4 probably mean?A. Concerns.B. Reasons.C. Changes.D. Problem.14. Why did Matthew choose to go to public school?A. He wanted to make more friends.B. He wanted to do experiments in labs.C. He wanted to take all kinds of classesD.He wanted to experience the school environment15. What in the authors attitude cowards homeschooling?A. Supportive.B. Doubtful.C. Uninterested.D. Unclear.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。
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2019-2020年高考复读中心二轮复习专题一 p 训 练
命题人：王新进
一、不定选择题：
1、如图所示，物块A 、B 叠放在粗糙的水平桌面上，水平外力F 作用在B 上，使
A 、
B 一起沿水平桌面向右加速运动。
设A 、B 之间的摩擦力f 1,B 与水平桌面
间的摩擦力为f 2,若水平外力F 逐渐增大，但A 、B 仍保持相对静止，则摩擦力
f 1和f 2,的大小
A. f 1不变、f 2变大
B. f 1变大、f 2不变
C. f 1和f 2都变大
D. f 1和f 2都不变
2、如图所示的装置，用两根细绳拉住一个小球，两细绳间的夹角为θ，细绳AC 呈水平状态，现将整个装置在纸面内侧时针缓慢转动，共转过90°。
在转过
的过程中，CA 绳中的拉力F 1和CB 绳中的拉力F 2的大小发生变化，即
A. F 1先变小后变大
B. F 1先变大后变小
C. F 2逐渐减小
D. F 2最后减小到零
3、历史上有些科学家曾把在相等位移内速度变化相等的单向直线运动称为“匀变速直线运动”（现称“另类匀变速直线运动”），“另类加速度”定义为A =s
v v t 0-，其中v 0和v t 分别表示某段位移s 内的初速度和末速度。
A>0，表示物体做加速运动，A<0表示物体做减速运动。
而现代物理学中加速度的定义式为a =
t v v t 0-，下列说法中正确的是 A 若A 不变，则a 也不变
B 若A>0且保持不变，则a 逐渐变大
C 若A 不变，物体在中间位置处的速度为2
0v v t + D 若A 不变，则物体在中间位置处的速度为22
20v v t +
4、如图所示，小车上物体的质量m =8kg ，它被一根在水平方向上拉伸了的弹簧拉住而静止在小车上，这时弹簧的弹力为6N ，现沿水平向右的方向对小车施一
作用力，使小车由静止开始运动起来，运动中加速度由零逐渐增大到1m/s 2，
然后以1m/s 2的加速度做匀加速直线运动，以下说法中错误的是
A.物体与小车始终保持相对静止，弹簧对物体的作用力始终没有发生变化
B.物体受到的摩擦力先减小、后增大，先向左、后向右
C.当小车的加速度(向右)为0.75m/s 2时，物体不受摩擦
力作用
D.小车以1m/s 2的加速度向右做匀加速度直线
运动时，
物体受到的摩擦力为8N
5、来自质子源的质子(初速度为零)，经一直线加速器加
速，形成电流为I 的细柱形质子流，已知质子源与靶
间的距离为d ，质子电荷量为e ，假定分布在质子源
到靶之间的加速电场是均匀的，质子达靶时的速度为u ，则质子源与靶间质子数为
A.eu Id
B.eu Id 2
C.u Id
D.u
Id 2 6、如图物体原来静止在水平面上，用一水平力F 拉物
体，在F 从0开始逐渐增大的过程中，物体先静止后又
做加速运动，其加速度a 随外力F 变化的图（b ）中所示
标出的数据可计算出
A.物体的质量
B.物体与水平面间滑动摩擦力
C.物体与水平面间的最大静摩擦力
D.在F 为14N 时，物体的速度大小
7、如图所示，坚直放置在水平上的轻弹簧上叠放着两物块A 、B ，A 、B 的质
均为2kg ，它们处于静止状态，若突然将一个大小为10N ，方向坚直向下
的力施加在物块A 上，则此瞬间，A 对B 压力的大小为（取g =10m/s 2）。
A 、5N
B 、15N
C 、25N
D 、35N
8、一带正电单摆在水平电场中振动，如图所示，A 点为平衡位置，B 、C 两点分别
为振动的两个最大位移处，在振动过程中
A 如果在A 处烧断细线，小球沿OA 方向做直线运动
B 如果在B 处烧断细线，小球将沿OB 方向做直线运动
C 如果在A 处烧断细线，小球将做曲线运动
D 如果在B 处烧断细线，小球将平行OA 方向做直线运动
9、一个质量可忽略不计的降落伞，下面吊一个很轻的弹簧测力计，测力计下面挂一个
质量为10kg 的物体，降落伞在下降过程中受到的空气阻力为30N ，则在此过程中
测力计的示数为（取g =10m/s 2）
A 130N
B 30N
C 70N
D 100N
10、如图所示，质量为m 的物体在沿斜面向上的拉力F 作用下沿斜面匀速下滑。
此过
程中斜面仍静止，斜面质量为M ，则水平地面对斜面体
A 无摩擦力
B 有水平向左的摩擦力
C 支持力为（M+m ）g
D 支持力小于（M+m ）g
11、在粗糙水平木板上放一物块，沿如图所示的逆时针方向在竖直平面内做匀速圆周
运动，圆半径为R ，速率v <Rg ，ac 为水平直径，bd 为竖直直径。
设运动中木板始终保持水平，物体相对于木板静止，则
A 物块始终受两个力作用
B 物块受到的合外力始终指向圆心
C 从a 运动到d ，物块处于超重状态
D 从b 运动a ，物块处于超重状态
12、如图所示，匀强磁场垂直纸面向里，有一足够长的等腰三角形绝缘滑槽，两侧斜槽与水平
夹角均为θ，在斜槽的顶点两侧各放一个质量相等、带等量负电荷的小球A 和B ，两小球与斜槽动摩擦因数相等，且μ<tan θ。
将两小球同时由静止释放，忽略小球间的静电力作用，下面说法正确的是
A 两球沿斜槽都做匀加速运动，且加速度相等
B 两球沿斜槽都做匀加速运动，且a A >a B
C 两球沿斜槽都做变加速运动，且a A >a B
D 两球沿斜槽的最大位移关系是s A <s B
13、一物体自斜面的顶端A 向斜面方向平抛物体，物体最终落在斜面
上，则
A 平抛的初速度越大，物体落到斜面上时的速度也越大
B 平抛的初速度越大，物体落到斜面上时的时间一定越长
C 平抛的初速度越大，物体落到斜面上时的速度与斜面的夹角越小
D 物体落到斜面上时的速度与斜面的夹角的大小与平抛的初速度大小无关
二、计算题：
14、鸵鸟是当今世界上最大的鸟，有人说它不会飞是因为翅膀退化，如果鸵鸟长了一副与身 体大小成比例的翅膀，它是否就能飞起来呢？这是一个使人极感兴趣的问题，试阅读下列材料并解答下列问题。
（1）鸟飞翔的必要条件是空气的上举力F 至少与体重G =mg 平衡，鸟扇动翅膀获得的上举力可表示为F =cSv 2，式中S 为鸟翅膀的面积，v 为鸟飞行的速度，c 是恒量，求鸟类起飞的临界速率。
（2）我们作一个简单的几何相似性假设。
设鸟的几何线度为l ，质量m 与l 3成正比，翅膀面积S 与l 2成正比，于是起飞的临界速率v 与l 成正比。
燕子起飞的临界速率大约为20km/h ，而舵鸟的体长大约是燕子的25倍，而实际上鸵鸟的奔跑速度大约只有40km/h 。
试说明鸵鸟为什么飞不起来。
15、（1）试由万有引力定律推导：绕地球做圆周运动的人造卫星的周期T 跟它的轨道半径r 的2
3次方成正比。
（2）A 、B 颗人造地球卫星绕地球做圆周运动，它们的圆轨道在同一平面内，周期之比是21T T =2
233。
若两颗卫星的最近距离等于地球半径R ，求这两颗卫星的周期各是多少？从两颗卫星相距最近开始计时到两颗卫星相距最远至少经过多少时间？已知在地面附近绕地球做圆周运动的卫星的周期为T 0。
16、如图所示，细绳长l ，吊一个质量为m 的铁球，绳受到大小为2mg 的拉力就会断裂，绳的
上端系一质量不计的环，环套在光滑水平杆上。
起初环带着球一起以速度v =gl 向右运动，在A 处环被挡住而停下的瞬间，绳子所受拉力为多少？在以后的运动过程中，球是先碰墙还是先碰地？第一次的碰撞点离墙角B 点的距离是多少？（已知A 处离墙的水平距离为l ，球离地的高度h=2l ）
17、如图所示，叠放在水平桌面上的A 、B 两个长方形木块，质量分别为m A =0.5kg 和m B =0.2kg ，
A 、
B 之间的动摩擦因数μ1=0.4，g 取10m/s 2，则：
（1）若桌面光滑，沿水平方向作用于A 的拉力F 1至少为多大，
才能使 A 、B 分离？
（2）若桌面不光滑，B 与桌面间的动摩擦因数μ2=0.1，要使
A 、
B 分离，作用于A 的水平拉力F 2至少应为多大？
18、如图所示，有一水平放置的足够长的皮带输送机以v =5m/s 的速率沿顺时针方向运行。
有
一物体以v 0=10m/s 的初速度从皮带输送机的右端沿皮带水平向左滑动。
若物体与皮带间的动摩擦因素μ=0.5，并取g =10m/s 2，求物体从滑上皮带到离开皮带所用的时间。
参考答案
1B 2BCD 3BC 4 D 5B 6ABC 7C 8CD 9B 10BD 11BC 12CD 13ABD 14(1)cs
mg (2)略 15（2）331=T T 0 222=T T 0 t=2233630-T 16 2mg 先碰墙
l 23 17、F 1＞7N F 2＞5.25N 18 t =4.5s。