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上海市长宁区2018届(年)初三九年级上学期期末质量检测物理试卷试题及答案

2017-2018学年第一学期初三物理教学质量检测试卷（考试时间90分钟，满分100分）考生注意：1．本试卷含五个大题。

2．答题时，考生务必按答题要求在答题纸规定的位置上作答，在草稿纸、本试卷上答题一律无效。

一、选择题（共20分）下列各题均只有一个正确选项，请将正确选项的代号用2B 铅笔填涂在答题纸的相应位置上，更改答案时，用橡皮擦去，重新填涂。

1．我国家庭电路的电压是A ．220VB ．110VC ．24VD ．1.5V2．铁轨铺设在枕木上是为了A ．减小压力B ．增大压力C ．减小压强D ．增大压强3．空气的密度约为1.29千克/米3，一般卧室中空气的质量最接近以下哪个物体的质量A ．一张纸B ．一本书C ．一只鸡D ．一个成人4．首次测定了大气压数值的科学家是A ．帕斯卡B ．托里拆利C ．牛顿D ．阿基米德5．以下各实例中，利用连通器原理工作的是A ．茶壶B ．吸尘器C ．密度计D ．抽水机6．如图1所示，闭合电键S 时，用电表能正确测量电阻R 1两端电压或通过电流的电路图是A ．B ．C ．D ．7．额定功率为1000瓦的用电器可能是A ．白炽灯B ．电视机C ．电冰箱D ．电烤箱8．同一艘轮船从长江航行驶入东海的过程中，若排开江水和海水的体积分别为V 江、 V 海，排开江水和海水的质量分别为m 江、m 海（ρ江＜ρ海），则 A ．V 江＝V 海，m 江＜m 海； B ．V 江＞V 海，m 江＜m 海； C ．V 江＞V 海，m 江＝m 海；D ．V 江＜V 海，m 江＜m 海。

9．如图2所示的电路，电源电压保持不变，电路中各元件连接正确且均完好，闭合电键S ，向右移动滑动变阻器滑片P 的过程中VPR 2 图1R 1SA＋－V SR 1 ＋－SR 1A－＋ R 1S－＋VA ．电流表A 的示数变大B ．电压表V 的示数变大C ．电压表V 与电流表A 的示数的比值变大D ．电压表V 与电流表A 的示数的乘积变小10．如图3所示，底面积不同的甲、乙两个实心圆柱体，它们对水平地面的压力F 甲＞F 乙。

2018长宁区初三英语一模卷及答案

2018长宁区初三英语一模卷及答案2018.1长宁区初三英语第一学期期末质量抽查试卷（满分150分，完卷时间100分钟）考生注意：本卷有7大题，共94小题。

试题均采用连续编号，所有答案务必按照规定在答题卡上完成，做在试卷上不给分。

Part 1 Listening （第一部分听力）I. Listening comprehension (听力理解) (共30 分)A. Listen and choose the right picture (根据你听到的内容，选出相应的图片) (6 分)1. ______2. ______3. ______4. ______5. ______6. ______B. Listen to the dialogue and choose the best answer to the question you hear(根据你听到的对话和问题，选出最恰当的答案)：(8分)7. A. Mike’ｓB. Betty’ｓC. Julia’ｓD. Ben’ｓ8. A. White B. Brown C. Blue D. Black9. A. Once B. Twice C. Three times D. Four times10. A. In a fashion shop B. In a restaurant C. In a school libraryD. In a supermarket11. A. At 7:00 p.m. B. At 7:30 p.m. C. At 8:00 p.m. D. At 8:30 p.m.12. A. A teacher B. A doctor C. A librarian D. A student13. A. Because she is ill today.B. Because she has left his homework at home.C. Because she’s failed in his writing exam.D. Because she doesn’t know what to write.14. A. The food in the school canteen is very expensive.B. The food in the school canteen tastes delicious.C. A new cook will come to the school canteen soon.D. She doesn’t like the food in the school canteen.C. Listen to the passage and tell whether the following statements are true or false (判断下列句子是否符合你听到的内容, 符合的用“T”表示，不符合的用“F”表示) (6分)15. Nancy jumped off a swing（秋千）and broke her dog.16. Nancy felt very sad, for she couldn’t take part in the spring dance performance.17. When Ms. Chang learnt Nancy’s leg wasbroken, she was nearly mad.crutches（拐杖）looked stupid.18. Nancy refused to go on stage because thecast（石膏夹）looked big and clumsy, she danced at night.19. Though Nancy’s20. Finally Nancy’s dance moved the audience so much that they gave her many roses.（听短文，完成下列内容。

2018长宁区初三英语一模卷及问题详解

2018.1长宁区初三英语第一学期期末质量抽查试卷（满分150分，完卷时间100分钟）考生注意：本卷有7大题，共94小题。

试题均采用连续编号，所有答案务必按照规定在答题卡上完成，做在试卷上不给分。

Part 1 Listening （第一部分听力）I. Listening comprehension (听力理解) (共30 分)A. Listen and choose the right picture (根据你听到的容，选出相应的图片) (6 分)1. ______2. ______3. ______4. ______5. ______6. ______B. Listen to the dialogue and choose the best answer to the question you hear (根据你听到的对话和问题，选出最恰当的答案)：(8分)7. A. Mike’s B. Betty’s C. Julia’s D. Ben’s8. A. White B. Brown C. Blue D. Black9. A. Once B. Twice C. Three times D. Four times10. A. In a fashion shop B. In a restaurant C. In a school library D. In a supermarket11. A. At 7:00 p.m. B. At 7:30 p.m. C. At 8:00 p.m. D. At 8:30 p.m.12. A. A teacher B. A doctor C. A librarian D. A student13. A. Because she is ill today.B. Because she has left his homework at home.C. Because she’s failed in his writing exam.D. Because she doesn’t know what to write.14. A. The food in the school canteen is very expensive.B. The food in the school canteen tastes delicious.C. A new cook will come to the school canteen soon.D. She doesn’t like the food in the school canteen.C. Listen to the passage and tell whether the following statements are true or false (判断下列句子是否符合你听到的容, 符合的用“T”表示，不符合的用“F”表示) (6分)15. Nancy jumped off a swing（秋千）and broke her dog.16. Nancy felt very sad, for she couldn’t take part in the spring dance performance.17. When Ms. Chang learnt Nancy’s leg was broken, she was nearly mad.18. Nancy refused to go on stage because the crutches（拐杖）looked stupid.19. Though Nancy’s cast（石膏夹）looked big and clumsy, she danced at night.20. Finally Nancy’s dance moved the audience so much that they gave her many roses.D. Listen to the passage and complete the following sentences（听短文，完成下列容。

上海市长宁区2018届九年级英语上学期期末质量检测试题牛津上海版(附答案)

上海市长宁区2018届九年级英语上学期期末质量检测试题Part 1 ListeningI. Listening comprehensionA. Listening and choose the right picture1. ________2. ________3. ________4. ________5. ________6. ________B. Listen to the dialogue and choose the best answer to the question you hear7. A. Mike’s B. Betty’s C. Julia’s D. Ben’s8. A. White B. Brown C. Blue D. Black9. A. Once B. Twice C. Three times D. Four times10. A. In a fashion shop B. In a restaurant C. In a school library D. In a supermarket11. A. At 7:00 p.m. B. At 7:30 p.m. C. At 8:00 p.m. D. At 8:30 p.m.12. A. A teacher B. A doctor C. A librarian D. A student13. A. Because she is ill today.B. Because she has left his homework at home.C. Because she’s failed in his wri ting exam.D. Because she doesn’t know what to write.14. A. The food in the school canteen is very expensive.B. The food in the school canteen tastes delicious.C. A new cook will come to the school canteen soon.D. She doesn’t like the food in the s chool canteen.C. Listen to the passage and tell whether the following statements are true or false.15. Nancy jumped off a swing（秋千）and broke her dog.16. Nancy felt very sad, for she couldn’t take part in the spring dance performance.17. When Ms. Chang learnt Nancy’s leg was broken, she was nearly mad.18. Nancy refused to go on stage because the crutches（拐杖）looked stupid.19. Though Nancy’s cast（石膏夹）looked big and clumsy, she danced at night.20. Finally Nancy’s dance moved the audience so much that th ey gave her many roses.D. Listen to the passage and complete the following sentences21. The summer course teaches ______ ______ how to design computer games.22. The course enables you to get a chance to ______ ______ two top game designers.23. The course is from ______ ______ to August 14th this year, five more days than last year.24. You can pay ______ ______ online if you want to take the summer course.25. Please bring a photo of yourself and your ______ ______ when coming for the course.Part 2 Phonetics、Grammar and VocabularyII. Choose the best answer26. Which of the following words as pronounced as /mɑ:k/ ?A. matchB. MarchC. markD. math27. The teacher tells us that newspaper reading is ______ way to improve our English.A. aB. anC. theD. /28. Tom, you are the person I’m looking ______! Come to help me deal with the case.A. atB. forC. afterD. up29. The world is changing fast, and we ______ are unaware of what is going to happen.A. usB. ourC. oursD. ourselves30. We saw a couple of laptops, but ______ of them was really what we wanted.A. neitherB. allC. bothD. either31. We can get more ______ about international affairs on the Internet than before.A. reportB. bookC. informationD. suggestion32. --Do you know ______ Doris has been in the Science Club?--I guess she has been in it since she came to our school.A. how soonB. what timeC. how muchD. how long33. The mess along the river has been cleaned up, so the river no longer smells ______.A. badlyB. badC. goodD. well34. Steven asked the taxi driver to driver a little ______ because he had to catch the last train.A. quicklyB. the most quicklyC. more quicklyD. less quickly35. Yo u’ll not make any progress ______ you get rid of your bad habit of study.A. becauseB. afterC. ifD. unless36. The British swimmer received a lot of cheers from the audience ______ he lost the race.A. as soon asB. thoughC. untilD. before37. You ______ hurry to the meeting now because it is put off till 12:30 at noon.A. shouldn’tB. needn’tC. can’tD. mustn’t38. Tim’s sister ______ as a waitress in a big restaurant for the time being.A. was workingB. workedC. has workedD. is working39. The lawyer ______ by a few reporters when he appears in the hall this afternoon.A. will be interviewedB. has been interviewedC. is interviewedD. was interviewed40. In my opinion, it is never a good idea to let your pet ______ whatever it wants.A. eatB. ateC. to eatD. eating41. The robber in the police station still denied ______ anything about the bank robbery.A. knowB. to knowC. knowingD. knew42. Be careful with your money when you are in a crowded underground, ______?A. don’t youB. won’t youC. do youD. will you43. ______ great fun it is to go fishing in the countryside at the weekend!A. HowB. WhatC. What aD. What an44. --Could you help me, James? There is something wrong with my smart phone.--______ I can put it right.A. That’s rightB. Never mindC. Don’t worryD. What a pity45. --Remember to give my best wishes to your parents.--______A. OK, I willB. It doesn’t matterC. It’s hard to sayD. Yes, pleaseIII. Complete the following passage with the words or phrases in the box. Each can be used only once.A. now thatB. joinedC. justD. right awayE.destroyedTwo men walked through the countryside toward another village. As they come to the edge of a river, they saw an old woman sitting there upset because the bridge was __46__ by the storm, and she was too weak to walk across the stream. The first man said __47__, “We are tall enough, and we can carry you across” The se cond man thought it troublesome, but he agreed reluctantly（不情愿地）. So the two men __48__ the bridge, lifted her between them and carried her across the river. When they got to the other side, they set her down and she went on her way gratefully. After they had walked another mile or so, the second man began to complain “My back began to hurt for lifting her.” The first man __49__ smiled and nodded without a word.A. breathB. controlC. seriousD. the pastE.fartherThe second man complained every other mile, his back pain got more and more __50__. On the 5th mile, he couldn’t stand it any more and fell down on the grass. “My back is hurting me so badly.I can’t go any __51__ because of the pain and it is all because we had to carry that silly woman across the river!” Out of __52__, he asked “Why aren’t you complaining about it? Doesn’t your back hurt?”“Of course not.” The first man replied. “You have been carrying the woman since we left the river bank. But I set her down five miles ago.”We are often like that second man who keeps on complaining and can’t get over the pain of __53__. Years later, we will still be carrying the burden, worn out and can’t go any further.IV. Complete the sentences with the given words in their proper form.54. When Tina was sad, her mother often told her some ______ to make her happy. (joke)55. The young couple plan to have a ______ baby in the following year. (two)56. Damin was a ______. He usually went fishing with a boat in the late afternoon. (fish)57. I hadn’t seen Andera for ages. When I appeared before him, he looked very ______. (surprise)58. A good diet should ______ plenty of fresh vegetables and fruits. (including)59. The rising number of cars made the air in the city become even ______. (bad)60. Angela’s interest in Chinese literature ______ come from her parent. (main)61. The lady felt ______ and said that she would complain to the manager. (happy)V. Complete the following sentences as required62. Molly had to come to the airport at six that morning. （改为否定句）Molly ______ ______ to come to the airport at six that morning.63. Most sportsmen on the basketball team are tall and strong. （对画线部分提问）______ do most sportsmen on the basketball team ______ like?64. Don’t forget to say sorry t o others when you do something wrong. （保持句意基本不变）Don’t forget to ______ ______ others when you do something wrong.65. “Have you ever been in a maglev train?” Our science teacher asked us. （合并成一句）Our science teacher asked us ______ we ______ ever been in a maglev train.66. Short-term memory can hold about seven item of information at a time. （改为被动语态）About seven item of information can ______ ______ at a time by short-term memory.67. Sometimes children are too young to tell the bad from the good. （保持句意基本不变）Sometimes children are ______ young ______ they can’t tell the bad from the good.68. Britain, with, travel around, you, a local tour guide, had better. （连词成句）____________________________________________________________Part 3 Reading and WritingVI. Reading comprehensionA. Choose the best answerMy favorite area in Britain is a country called Northumberland in the north-east of the country.I like it because it has mountains, the sea and history. The mountains are not very high. In China you would probably call them hills rather than mountains as they are less than 1,000 meters high, but there is something wild about these mountains you get a feeling of space and freedom. You can walk for miles without meeting another person.Northumberland is full of history. There are seven castles, some of them were ruined and the others still there as they were centuries ago. You can find graves going back to prehistoric（史前的）, times and strange carvings on rocks which nobody understands. The coast line is dramatic too, with beautiful sandy beaches. These beaches are rarely crowded because the weather is unpredictable and the North Sea is very cold! People don’t go for seaside holidays to Northumberland because of the cold sea and weather, so even in high se ason there aren’t many tourists.There is an island called Holy Island off the coast of Northumberland, you can get to the island by car or on foot when the tide is out. There is also one castle I particularly like. It is a 14th century castle which stands on a cliff right by the sea. The castle is almost completely ruined, but it looks dramatic and romantic because you can still see the gate and two of its owners. On a summer’s day you can lie on the beach nearby and let your mind wander as you look at th is dream-like castle. On a winter’s day you can walk to the castle and watch the waves crash into the cliff, wondering how this castle has stood so long against the forces of nature.I once said to a friend of mine that I thought this castle by the sea was the most beautiful place in the world. She laughed and said there must be many more dramatic places in the world. In one way, I’m sure she’s right, but for me, it’s not just about what a place looks like, it’s about what it says to you.69. In China people probably call them mountains which are ______ 1,000 meters high.A. less thanB. nearlyC. more thanD. almost70. How are the seven castles in Northumberland?A. They are modern and fantastic.B. They are all complete and magnificent.C. Some hasn’t changed at all for centuries.D. Some are full of strange carvings.71. Not many people visit the beautiful beach because of ______.A. the soft sandsB. the cold sea and weatherC. the warm seaD. the island nearby72. Which of the following is NOT TRUE about the reason why the author likes the 14th century castle?A. It was built in the 14th century on a cliff right by the sea.B. It looks very dramatic and romantic with two towers but no gate.C. The author can let his mind wander as he looks at this dream-like castle.D. The author can walk to the castle and watch the waves crash into the cliff.73. From the last paragraph in the passage, we know ______.A. the author’s friend agreed on his opinion about the castle.B. th e author doesn’t think there are many more dramatic places in the world.C. the author’s friend pays no attention to the beautiful scenery.D. what the author cares is not only the scenery but also the feeling he can get from it.74. You can get the passage from the following materials EXCEPT ______.A. science fictionB. journalsC. newspapersD. magazinesB. Choose the best answer and complete the passage.The first day of university our professor introduced himself and challenged us to get to know someone we didn’t already know. I stood up to look around when a __75__ hand touched my shoulder.I turned around to find a wrinkled（有皱纹的）, little old lady with a smile. She __76__ a minute and said, “Hi, handsome. My name is Rose. I’m eighty-seven yea rs old. Can I give you a hug?”I laughed and responded, “Of course you may!” and she gave me a big one.We became immediate friends. Every day for the next three months, we would leave class together and talk nonstop. I always loved listening to this ‘time machine’ __77__ she shared her wisdom and experience with me. Over the course of this year Rose became a campus role model and she __78__ made friends wherever she went. She loved to dress up and she loved the attention from the other students.At the e nd of the term we invited Rose to speak at our football club. I’ll never forget what she taught us. She was introduced and stepped up to the platform. As she began to deliver he prepared speech, she dropped her cards on the floor. A little upset she simply said, “I’m sorry I’m so nervous. I __79__ beer for Lent（大裔节）and this wine is killing me! I’ll never get my speech back in order …” As we laughed, she cleared her throat and began, “We do not stop playing because we are old; wo grow old because we stop playing. There is a huge __80__ between growing older and growing up. Anybody can grow older, but it does take talents and abilities to grow up…”One week after graduation Rose died peacefully in her sleep. However, these words have been passed along in loving memory of ROSE.75. A. gentle B. cold C. hard D. awful76. A. left B. returned C. hesitated D. refused77. A. until B. but C. though D. as78. A. rarely B. easily C. suddenly D. carefully79. A. gave up B. put up C. took up D. turned up80. A. chain B. result C. deal D. differenceC. Fill in the blanks with proper words.Children grow quickly, especially their feet. But many families, cannot a__81__ new shoes when a child needs them. As a result, about 300 million children around the world go barefoot. Those children risk picking up diseases and parasites（寄生虫）from the soil.An American man has a s__82__ for those barefoot kids –a shoe that grows with the child. Kenton Lee is the creator of The Shoe That Grows. He explains how the shoe works and how it is able to last so long.“It grows in three places: the front, the side and the back with the child. It can last up to five years. The b__83__ is compressed（压缩的）rubber like tire rubber. The top is just high-quality leather.”The shoe comes in two sizes: small that fits children aged 4 to 9 and large for children aged 9 to 14. Lee says he got the idea for the shoe while working as a v__84__ in an orphanage in Kenya. “… and there was a little girl in a whit e dress walking next to me. And I just remember looking down and seeing how small her shoes were. And she had to c__85__ open the front of her shoes to let her toes（脚趾）stick out. At that time I just remember thinking, wouldn’t it be nice if there were a pa ir of shoes that could grow with her feet?” However, Lee says it was i__86__ to turn his idea into a reality at that time. “Yet I kept writing down I should do this because of this or because of that. All these reasons why it really was important for me to try to make the shoes grow are to try to help them.” Finally, in 2009 Lee founded a non-profit organization called Because International. Together, they have sent over 50,000 pairs of shoes to 70 countries. Lee says a pair shoes gives a child self-worth and more chances to succeed b__87__ much protection.D. Answer the questionsYou are invited to a large party. Loud music is playing, and lots of people are dancing. Do you dance or talk to as many people as you can call all night? Later, you cannot fall asleep—you want more conversation! Or do you prefer a quieter corner? Or perhaps you cannot wait to go home early and relax by yourself.Which of these people sound most like you? Person A, who tries to talk to everyone and stays late? Or Person B, who prefers to keep quiet and leaves early?If you said Person A, you are probably more extroverted（性格外向的）. If you said Person B, you are probably more introverted（内向的）. Or perhaps you are Person C and fall somewhere in the middle. Introverted and extroverted p eople are two commonly used words to describe a person’s personality. And they are also commonly misused and misunderstood.Introverts may be thought as quiet, shy and timid. Extroverts may be thought as bold, confident, loud and full of energy. Introverted and extroverted people may fit those descriptions. But these same descriptions do not define（下定义）introversion and extroversion properly.Introverts and extroverts use their brains differently, and they get their energy differently. Introversion is the state of being mostly concerned with one’s own mental life. Extroversion is the opposite. Extroversion is the state of being mostly concerned with what is outside oneself.People who consider themselves introverts may say they “need to be alone to charge their batteries”. However, introverts may still live being social and going to parties. But such activities require time to prepare.Extroverts may say, “I don’t need ‘alone time’, I feel more relaxed being around other people.” Even so, extroverts can st ill feel unsure or not confident among other people.So where do you fall on the introversion/ extroversion chart?88. If Person B is invited to a large party, what does he probably do?89. Which three words in this passage are used to describe introverts?90. What’s the main idea of the 5th paragraph?91. What do “such activities” refer to in paragraph 6?92. How do extroverts usually make themselves relaxed?93. Which personality do you prefer, introverted or extroverted? Show your reason!VII. Writing94. Write at least 60 words about the topic “I finished a task successfully” （请以‘我成功地完成了一项任务’为题，写一篇不少于60词的短文，标点符号不占格。

2018年度长宁区初三英语一模卷及答案解析

2018.1长宁区初三英语第一学期期末质量抽查试卷（满分150分，完卷时间100分钟）考生注意：本卷有7大题，共94小题。

试题均采用连续编号，所有答案务必按照规定在答题卡上完成，做在试卷上不给分。

Part 1 Listening （第一部分听力）I. Listening comprehension (听力理解) (共30 分)A. Listen and choose the right picture (根据你听到的内容，选出相应的图片) (6 分)1. ______2. ______3. ______4. ______5. ______6. ______B. Listen to the dialogue and choose the best answer to the question you hear(根据你听到的对话和问题，选出最恰当的答案)：(8分)7. A. Mike’s B. Betty’s C. Julia’s D. Ben’s8. A. White B. Brown C. Blue D. Black9. A. Once B. Twice C. Three times D. Four times10. A. In a fashion shop B. In a restaurant C. In a school library D. In a supermarket11. A. At 7:00 p.m. B. At 7:30 p.m. C. At 8:00 p.m. D. At 8:30 p.m.12. A. A teacher B. A doctor C. A librarian D. A student13. A. Because she is ill today.B. Because she has left his homework at home.C. Because she’s failed in his writing exam.D. Because she doesn’t know what to write.14. A. The food in the school canteen is very expensive.B. The food in the school canteen tastes delicious.C. A new cook will come to the school canteen soon.D. She doesn’t like the food in the school canteen.C. Listen to the passage and tell whether the following statements are true or false (判断下列句子是否符合你听到的内容, 符合的用“T”表示，不符合的用“F”表示) (6分)15. Nancy jumped off a swing（秋千）and broke her dog.16. Nancy felt very sad, for she couldn’t take part in the spring dance performance.17. When Ms. Chang learnt Nancy’s leg was broken, she was nearly mad.18. Nancy refused to go on stage because the crutches（拐杖）looked stupid.19. Though Nancy’s cast（石膏夹）looked big and clumsy, she danced at night.20. Finally Nancy’s dance moved the audience so much that they gave her many roses.D. Listen to the passage and complete the following sentences（听短文，完成下列内容。

[试卷合集3套]上海市长宁区2018年九年级上学期物理期末统考试题

初三上学期期末物理试卷一、选择题1．有两个白炽灯，甲灯标有“220V100W”字样，乙灯标有“220V60W”根据这些信息可知A．甲和乙的额定电流I甲＜I乙B．甲和乙的电阻关系R甲＞R乙C．把它们串联在电路中甲灯比乙灯亮D．把它们并联在电路中甲灯比乙灯亮【答案】D【解析】A、由灯泡的铭牌可知，两灯泡的额定电压相等，甲灯的额定功率大于乙灯的额定功率，由P IU =可知，甲和乙的额定电流I甲＞I乙，故错误；B、由灯泡的铭牌可知，两灯泡的额定电压相等，甲灯泡的额定功率大，由2URP=可知，甲和乙的电阻关系R甲＜R乙，故错误；C、因串联电路中各处的电流相等，所以把它们串联在电路中，由于R甲＜R乙，根据2P I R=可知，乙灯泡的实际功率较大，乙灯泡较亮，故错误；D、因并联电路中各支路两端的电压相等，由2UPR=可知，甲灯的实际功率较大，即它们并联在电路中甲灯比乙灯亮，故正确。

故选D.2．如图所示是电阻甲和乙的U﹣I图象，下列说法正确的是（）A．甲的电阻值保持10Ω不变B．乙的电阻值保持20Ω不变C．甲、乙并联在电路中，当电源电压为2 V时，电路总电流为0.3 AD．甲、乙串联在电路中，当电路电流为0.2 A时，电路总电压4V【答案】C【详解】AB．由图象可知，甲对应的电流与电压成正比，而乙对应的电流与电压不成正比，根据欧姆定律可知甲电阻的阻值不变，乙电阻的阻值变化，由图象可知，当甲两端电压为2V时，通过甲的电流为0.1A，由I＝UR可得：R 甲＝U I 甲甲＝2V 0.1A＝20Ω；故AB 错误；C ．甲、乙并联在2V 电源时，根据并联电路的电压特点可知两电阻两端的电压为2V ，由图象可知，I 甲＝0.1A ，I 乙＝0.2A ，因并联电路中干路电流等于各支路电流之和，所以，干路电流：I ＝I 甲+I 乙＝0.1A+0.2A ＝0.3A ，故C 正确；D ．甲、乙串联在电路中，当电路电流为0.2A 时，通过甲、乙的电流均为0.2A ，由图象可知，U 甲＝4V ，U 乙＝2V ，因串联电路中总电压等于各分电压之和，所以，电路总电压：U ＝U 甲+U 乙＝4V+2V ＝6V ，故D 错误。

┃精选3套试卷┃2018届上海市长宁区九年级上学期化学期末达标测试试题

九年级上学期期末化学试卷一、选择题1．下列物质不属于合金的是（）A．青铜B．锌C．钢D．生铁【答案】B【详解】合金是在一种金属中熔合另一种金属或非金属而形成的具有金属特性的物质。

A、青铜是在纯铜中加入锡、铅的合金，属于合金；B、锌是纯金属，不属于合金；C、钢是含碳量0.03%至2%的铁碳合金，属于合金；D、生铁是含碳量2%至4.3%的铁碳合金，属于合金；故选B。

2．下列化学用语书写正确的是（）A．两个氢分子：2H B．三个二氧化碳分子：3CO2C．两个氯原子：Cl2D．一个钙离子：Ca+2【答案】B【详解】A、化学式前面数字表示分子个数2H2表示两个氢分子，故A错；B、化学式前面数字表示分子个数3CO2表示三个二氧化碳分子，B正确；C、元素符号前面数字表示原子个数，2Cl表示两个氯原子，故C错；D、离子所带电荷数写在元素符号右上角，数字在前正负号在后，一个钙离子是Ca2+，故D错；故选：B。

3．下列关于水的说法正确的是A．活性炭可降低水的硬度B．自然界的水主要是淡水C．水是由氢、氧原子构成的D．净化水的流程包括沉淀、过滤、吸附、消毒【答案】D【详解】A、活性炭是吸附水中的异味和色素，不能降低水的硬度，故选项A不正确；B、自然界的水主要是海水，海水中含有大量的盐，主要是咸水，故选项B不正确；C、水是由水分子构成的，而不是由氢、氧原子构成，故选项C不正确；D、净化水的流程包括沉淀、过滤、吸附、消毒四个步骤，故选项D正确。

故选：D。

4．接近毒品就是走向死亡，摇头丸是一种新型毒品，吸食后对身体有严重的危害，其主要成分是MDMA （化学式为C11H15NO2），下列说法错误的是（）A．MDMA由4种元素组成B．一个MDMA分子中含有29个原子C．MDMA的相对分子质量为193gD．MDMA中氢，氮元素的质量比为15：14【答案】C【解析】A、由化学式可知，MDMA（化学式为C11H15NO2）是由碳、氢、氮、氧四种元素组成的，选项说法正确；故不符合题意；B、由化学式可知，每个MDMA（化学式为C11H15NO2）分子是由11个碳原子、15个氢原子、1个氮原子和2个氧原子构成的，共含29个原子，选项说法正确；故不符合题意；C、相对分子质量的单位不是“g”而是“1”，通常省略不写，选项说法错误；故符合题意；D、MDMA中，氢、氮元素的质量比为（1×15）：14＝15：14，选项说法正确；故不符合题意；故选C【点睛】考查同学们结合新信息、灵活运用化学式的含义与有关计算进行分析问题、解决问题的能力。

上海长宁区2018—2019学年第一学期初三数学期末质量检测含答案

长宁区2018—2019学年第一学期初三数学教学质量检测试卷（考试时间：100分钟满分：150分）考生注意:1.本试卷含三个大题,共25题.答题时,考生务必按答题要求在答题纸规定的位置上作答,在草稿纸、本调研卷上答题一律无效.2.除第一、二大题外,其余各题如无特别说明,都必须在答题纸相应位置上写出证明或计算的主要步骤. 一、选择题（本大题共6题, 每题4分, 满分24分）【每小题只有一个正确选项, 在答题纸相应题号的选项上用2B 铅笔正确填涂】 1．抛物线3)2(22-+=x y 的顶点坐标是（ ▲ ）（A ）)3,2(-；（B ）)3,2(--；（C ） )3,2(-；（D ） )3,2(． 2．如图，点D 、E 分别在ABC ∆的边AB 、AC 上，下列条件中能够判定BC DE //的是（ ▲ ）（A ）BCDEAB AD =；（B ）AC AE BD AD =；（C ）AECEAB BD =；（D ）AC AB AE AD =． 3．在ABC Rt ∆中，︒=∠90C ，如果31cos =B ，a BC =，那么AC 的长是（ ▲ ）（A ） a 22；（B ） a 3；（C ）a 10；（D ）a 42． 4．如果2||=a ，21-=，那么下列说法正确的是（ ▲ ）（A ）||2||=；（B ）是与方向相同的单位向量；（C ） 2=-；（D ） //． 5．在直角坐标平面内，点O 是坐标原点，点A 的坐标是)2,3(，点B 的坐标是)43,(-．如果以点O 为圆心，r 为半径的圆O 与直线AB 相交，且点A 、B 中有一点在圆O 内，另一点在圆O 外，那么r 的值可以取（ ▲ ）（A ）5；（B ）4；（C ）3；（D ）2．6．在ABC ∆中，点D 在边BC 上，联结AD ，下列说法错误的是（ ▲ ）（A ）如果︒=∠90BAC ，BC BD AB ⋅=2，那么BC AD ⊥；（B ）如果BC AD ⊥，CD BD AD ⋅=2，那么︒=∠90BAC ；（C ）如果BC AD ⊥，BC BD AB ⋅=2，那么︒=∠90BAC ；（D ）如果︒=∠90BAC ，CD BD AD ⋅=2，那么BC AD ⊥．第2题图ABDE二、填空题（本大题共12题, 每题4分, 满分48分）【在答题纸相应题号后的空格内直接填写答案】 7．若线段a 、b 、c 、d 满足54==d c b a ，则db ca ++的值等于 ▲ ． 8．如果抛物线3)3(2--=x m y 有最高点，那么m 的取值范围是 ▲ ． 9．两个相似三角形的周长之比等于4:1，那么它们的面积之比等于 ▲ ． 10．边长为6的正六边形的边心距等于 ▲ ．11．如图，已知CF BE AD ////，若3=AB ，7=AC ，6=EF ，则DE 的长为 ▲ ．12．已知点P 在线段AB 上，满足AB BP BP AP ::=，若2=BP ，则AB 的长为 ▲ ．13．若点)7,1(-A 、)7,5(B 、)3,2(--C 、)3,(-k D 在同一条抛物线上，则k 的值等于 ▲ ．14．如图，在一条东西方向笔直的沿湖道路l 上有A 、B 两个游船码头，观光岛屿C 在码头A 的北偏东60°方向、在码头B 的北偏西45°方向，4=AC 千米．那么码头A 、B 之间的距离等于 ▲ 千米．（结果保留根号）15．在矩形ABCD 中，2=AB ，4=AD ，若圆A 的半径长为5，圆C 的半径长为R ，且圆A 与圆C内切，则R 的值等于 ▲ ．16．如图，在等腰ABC ∆中，AC AB =，AD 、BE 分别是边BC 、AC 上的中线，AD 与BE 交于点F ，若6=BE ，3=FD ，则ABC ∆的面积等于 ▲ ．17．已知点P 在ABC ∆内，联结PA 、PB 、PC ，在PAB ∆、PBC ∆和PAC ∆中，如果存在一个三角形与ABC ∆相似，那么就称点P 为ABC ∆的自相似点．如图，在ABC Rt ∆中，︒=∠90ACB ，12=AC ，5=BC ，如果点P 为ABC Rt ∆的自相似点，那么ACP ∠的余切值等于 ▲ ．18．如图，点P 在平行四边形ABCD 的边BC 上，将ABP ∆沿直线AP 翻折，点B 恰好落在边AD 的垂直平分线上，如果5=AB ，8=AD ，34tan =B ，那么BP 的长为 ▲ ．第11题图B AC DE F第16题图ACD FE 第18题图第17题图ABC第14题图60°45° C西东南北 lA B三、解答题（本大题共7题, 满分78分）【将下列各题的解答过程, 做在答题纸的相应位置上】 19．（本题满分10分）计算：︒-︒︒+︒30cos 45cos 30sin 60cot 32.20．（本题满分10分，第（1）小题5分，第（2）小题5分）如图，AB 与CD 相交于点E ，BD AC //，点F 在DB 的延长线上，联结BC ，若BC 平分ABF ∠，2=AE ，3=BE ．（1）求BD 的长；（2）设=，=，用含、的式子表示BC ．21．（本题满分10分，第（1）小题5分，第（2）小题5分）如图，AB 是圆O 的一条弦，点O 在线段AC 上，AB AC =，3=OC ，53sin =A ．求：（1）圆O 的半径长；（2）BC 的长．22．（本题满分10分，第（1）小题6分，第（2）小题4分）如图，小明站在江边某瞭望台DE 的顶端D 处，测得江面上的渔船 A 的俯角为40°．若瞭望台DE 垂直于江面，它的高度为3米，2=CE 米， CE 平行于江面AB ，迎水坡BC 的坡度75.0:1=i ，坡长10=BC 米．（参考数据：sin40°≈0.64，cos40°≈0.77，tan40°≈0.84，cot40°≈1.19）（1）求瞭望台DE 的顶端D 到江面AB 的距离；（2）求渔船A 到迎水坡BC 的底端B 的距离．（结果保留一位小数）23．（本题满分12分，第（1）小题5分，第（2）小题7分）如图，点D 、E 分别在ABC ∆的边AC 、AB 上，延长DE 、CB 交于点F ，且AC AD AB AE ⋅=⋅．（1）求证：C FEB ∠=∠；（2）联结AF ，若FD CD AB FB =，求证：FB AC AB EF ⋅=⋅．第21题图OBC A第22题图40°BC D AEA BCDFE第20题图第23题图EDABF24．（本题满分12分，每小题4分）如图，在直角坐标平面内，抛物线经过原点O 、点)3,1(B ，又与x 轴正半轴相交于点A ，︒=∠45BAO ，点P 是线段AB 上的一点，过点P 作OB PM //，与抛物线交于点M ，且点M 在第一象限内．（1）求抛物线的表达式；（2）若AOB BMP ∠=∠，求点P 的坐标；（3）过点M 作x MC ⊥轴，分别交直线AB 、x 轴于点N 、C ，若ANC ∆的面积等于PMN ∆的面积的2倍，求NCMN 的值．25．（本题满分14分，第（1）小题4分，第（2）小题6分，第（3）小题4分）已知锐角MBN ∠的余弦值为53，点C 在射线BN 上，25=BC ，点A 在MBN ∠的内部，且︒=∠90BAC ，MBN BCA ∠=∠．过点A 的直线DE 分别交射线BM 、射线BN 于点D 、E ．点F 在线段BE 上（点F 不与点B 重合），且MBN EAF ∠=∠．（1）如图1，当BN AF ⊥时，求EF 的长；（2）如图2，当点E 在线段BC 上时，设x BF =，y BD =，求y 关于x 的函数解析式并写出函数定义域；（3）联结DF ，当ADF ∆与ACE ∆相似时，请直接写出BD 的长．第25题图如图 2BF EC N DA MB FC E N AD M如图1备用图BC NAM第24题图 xO A By备用图xO A By长宁区2018学年第一学期初三数学参考答案和评分建议2019.1一、选择题：（本大题共6题，每题4分，满分24分） 1．B ； 2．D ； 3．A ； 4．D ； 5．B ； 6．D ．二．填空题：（本大题共12题，满分48分）7．54； 8．3>m ； 9．1:16； 10．33； 11．29； 12．15+； 13．6； 14．232+； 15．525-或525+； 16．79； 17．512； 18．7725或．三、（本大题共7题，第19、20、21、22题每题10分，第23、24题每题12分，第25题14分，满分78分） 19. （本题满分10分）解：原式=232221)33(32-+⨯ (4分)=321313-+⨯(2分) =)32(33+- (2分) =3322-- (2分) 20．（本题满分10分，第（1）小题5分，第（2）小题5分）解：（1）∵BC 平分ABF ∠ ∴CBF ABC ∠=∠ ∵AC //BD ∴ ACB CBF ∠=∠ ∴ACB ABC ∠=∠ ∴AB AC =∵ 3,2==BE AE∴5==AC AB （3分）∵AC //BD ∴BEAEBD AC =（1分） ∴325=BD ∴ 215=BD （1分）（2）∵AC //BD ∴32==BD AC ED EC ∵=， ∴32-= （2分） ∴ b a EC32--=+=→ （3分）21．（本题满分10分，第（1）小题5分，第（2）小题5分）解：（1）过点O 作OH ⊥AB ,垂足为点H ,在 OAH Rt ∆中，∠OHA=︒90 ∴53sin ==AO OH A 设k OH 3=，k AO 5= （1分）则k OH AO AH 422=-=∵OH 过圆心O ,OH ⊥AB ∴k AH AB 82== （2分）∴k AB AC 8== ∴358+=k k ∴ 1=k （1分） ∴5=AO 即 ⊙O 的半径长为5. （1分）（2）过点C 作CG ⊥AB ，垂足为点G , 在 ACG Rt ∆中，∠AGC=︒90∴53sin ==AC CG A ∵8=AC ∴524=CG ， 53222=-=CG AC AG ，58=BG （3分）在 CGB Rt ∆中，∠CGB=︒90∴ 5108)524()58(2222=+=+=BG CG BC （2分） 22．（本题满分10分，第（1）小题6分，第（2）小题4分）解：（1）延长DE 交AB 于点F ，过点C 作CG ⊥AB ，垂足为点G ，由题意可知CE=GF=2，CG=EF （1分）在BCG Rt ∆中，∠BGC=︒90 ∴ 3475.01===BG CG i （1分）设k CG 4=，k BG 3=,则10522==+=k BG CG BC∴2=k ∴6=BG , ∴8==EF CG （2分） ∵3=DE ∴1183=+=+=EF DE DF 米（1分）答:瞭望台DE 的顶端D 到江面AB 的距离为11米. （1分） (2)由题意得 ∠A=︒40 在 ADF Rt ∆中，∠DF A=︒90∴ DFAFA =cot ∴19.111≈AF ∴09.1319.111=⨯≈AF （2分）∴1.509.5≈=--=GF BG AF AB 米（1分）答：渔船A 到迎水坡BC 的底端B 的距离为5.1米. （1分） 23．（本题满分12分，第（1）小题5分，第（2）小题7分）证明：（1）∵AC AD AB AE ⋅=⋅ ∴ABADAC AE =（1分）又∵A A ∠=∠ ∴AED ∆∽ACB ∆ （2分） ∴C AED ∠=∠ （1分）又∵FEB AED ∠=∠ ∴C FEB ∠=∠ （1分）（2）∵C FEB ∠=∠ , CFD EFB ∠=∠ ∴EFB ∆∽CFD ∆ ∴FDC FBE ∠=∠ （1分）∵FD CD AB FB = ∴FDABCD FB =∴ FBA ∆∽CDF ∆ ∴C AFB ∠=∠ ∴AC AF = （2分） ∵C FEB ∠=∠ ∴AFB FEB ∠=∠ （1分）又∵ABF FBE ∠=∠ ∴EFB ∆∽FAB ∆ （1分）∴ABFB AF EF = （1分）∵AC AF = ∴FB AC AB EF ⋅=⋅．（1分） 24．（本题满分12分，每小题4分）解：（1）过点B 作BH ⊥x 轴，垂足为点H, ∵)3,1(B ∴3,1==BH OH ∵,90︒=∠BHA ︒=∠45BAO ∴3==BH AH ，4=OA∴)0,4(A （2分） ∵抛物线过原点O 、点A 、B ∴设抛物线的表达式为)0(2≠+=a bx ax y⎩⎨⎧=+=+04163b a b a ∴ ⎩⎨⎧=-=41b a （1分）∴抛物的线表达式为x x y 42+-= （1分）（2）∵OB PM //∴BPM OBA ∠=∠ 又∵AOB BMP ∠=∠ ∴BPM ∆∽ABO ∆ ∴OAB MBP ∠=∠ ∴OA BM //∴设)3,(x M ∵M 在抛物线x x y 42+-=上 ∴ )3,3(M （2分） ∵直线OB 经过点)0,0(O 、)3,1(B ∴ 直线OB 的表达式为x y 3= ∵OB PM //且直线PM 过点)3,3(M ∴ 直线PM 的表达式为63-=x y ∵直线AB 经过点)0,4(A 、)3,1(B ∴ 直线AB 的表达式为4+-=x y∴⎩⎨⎧+-=-=463x y x y ∴ ⎪⎩⎪⎨⎧==2325b x ∴)23,25(P （2分）（3）延长MP 交x 轴于点D ，作MN PG ⊥，垂足为点G∴AD PG // ∴MDC MPG ∠=∠，︒=∠=∠45BAO GPN ∵BO PM // ∴BOA MDC ∠=∠ ∴BOA MPG ∠=∠∴3tan tan =∠=∠BOA MPG ∵︒=∠90MPG ∴3tan ==∠PGMGMPG 设t PG =，则t MG 3= ∵︒=∠90PGN ，︒=∠45GPN∴t GN PG ==，t MN 4= ∴22421t t t S PMN =⋅⋅=∆ （2分）∴222142NC t S S PMN ANC ===∆∆ ∴t NC 22= （1分）∴2224==ttNC MN （1分）25．（本题满分14分，第（1）小题4分，第（2）小题6分，第（3）小题4分）解：（1）∵在 BAC Rt ∆中 ︒=∠90BAC∴53cos cos ==∠=∠BC AC MBN BCA ∵25=BC ∴15=AC （1分）2022=-=AC BC AB （1分）∵AF BC AC AB S ABC ⋅=⋅=∆2121 ∴12=AF （1分） ∵BC AF ⊥ ∴︒=∠90AFC∴ 34t a n t a n ==∠=∠AF EF BCA FAE∴16=EF （1分）（2）过点A 作EF AH ⊥于点H ∴ ︒=∠90AHB∴ 1622=-=AH AB BH∵x BF =，x FH -=16，x FC -=25∴ 40032)16(122222+-=-+=x x x AF （1分） ∵ BCA MBN ∠=∠，EAF MBN ∠=∠∴BCA EAF ∠=∠ 又∵CFA AFE ∠=∠ ∴AFE ∆∽CFA ∆ ∴AFEFCF AF =，FAC AEF ∠=∠， ∴EF FC AF ⋅=2∴EF x x x ⋅-=+-)25(400322（1分）∴xx x EF -+-=25400322，xxx x x x BF EF BE --=+-+-=+=25740025400322 （1分）∵ ACB MBN ∠=∠，FAC AEF ∠=∠，∴BDE ∆∽CFA ∆∴ACBEFC BD = （1分） ∴1525740025x xx y--=- ∴157400x y -=（2250≤<x ）（1分+1分）（3） 596或 1172000 （2分+2分）。

上海市长宁区2018届(年)初三九年级上学期期末质量检测语文试卷试题及答案

长宁区2017-2018学年第一学期初三语文期终质量检测试卷（考试时间：100分钟满分：150分）考生注意：1.本试卷共27题。

2.请将所有答案做在答卷上，做在试卷上一律不计分。

一、文言文（40分）（一）默写（15分）1、秋风萧瑟，_____________________。

（《观沧海》）2、____________________，阴阳割昏晓。

（《望岳》）3、沉舟侧畔千帆过，______________________。

（《酬乐天扬州初逢席上见赠》）4、胡未灭，______________，______________。

（《诉衷情》）5、______________________，后天下之乐而乐。

（《岳阳楼记》）（二）阅读下面的作品，完成第6-7题（4分）卖炭翁（白居易）卖炭翁，伐薪烧炭南山中。

满面尘灰烟火色，两鬓苍苍十指黑。

卖炭得钱何所营?身上衣裳口中食。

可怜身上衣正单，心忧炭贱愿天寒。

夜来城外一尺雪，晓驾炭车辗冰辙。

牛困人饥日已高，市南门外泥中歇。

翩翩两骑来是谁？黄衣使者白衫儿。

手把文书口称敕，回车叱牛牵向北。

一车炭，千余斤，宫使驱将惜不得，半匹红绡一丈绫，系向牛头充炭直。

6、下列理解不恰当的一项是（）（1分）A.何所营：做什么用B.翩翩两骑：轻快洒脱的两位骑兵C.驱将：赶着走D.充炭直：抵充一车炭的价格7、作品描述了卖炭翁__________的经过，揭露了（两个字）的弊端，表达了诗人对__________的深切同情。

（3分）（三）阅读下文，完成第8-10题（9分）愚公移山（节选）太行、王屋二山，方七百里，高万仞，本在冀州之南，河阳之北。

A北山愚公者，年且九十，面山而居。

惩山北之塞，出入之迁也，聚室而谋曰：“吾与汝毕力平险，B指通豫南，达于汉阴，可乎？”C杂然相许。

其妻献疑曰：D“以君之力，曾不能损魅父之丘，如太行、王屋何？且焉置土石？”杂曰：“投诸渤海之尾，隐土之北。

”遂率子孙荷担者三夫，叩石垦壤，箕畚运于渤海之尾。

上海市长宁区2018届九年级上学期期末(一模)质量监控英语试题及答案(word版)

长宁区2017~2018学年度第一学期期末质量调研初三英语2018.1（满分：150 分，考试时间：150分钟）考生注意：本卷有7大题。

共94 小题。

试题均采用连续编号，所有答案务必按照规定在答题纸上完成，做在试卷上不给分。

Part 1 ListeningI. Listening comprehensionA. Listening and choose the right picture1. ________2. ________3. ________4. ________5. ________6. ________B. Listen to the dialogue and choose the best answer to the question you hear7. A. Mike’s B. Betty’s C. Julia’s D. Ben’s8. A. White B. Brown C. Blue D. Black9. A. Once B. Twice C. Three times D. Four times10. A. In a fashion shop B. In a restaurant C. In a school library D. In a supermarket11. A. At 7:00 p.m. B. At 7:30 p.m. C. At 8:00 p.m. D. At 8:30 p.m.12. A. A teacher B. A doctor C. A librarian D. A student13. A. Because she is ill today.B. Because she has left his homework at home.C. Because she’s failed in his writing exam.D. Because she doesn’t know what to write.14. A. The food in the school canteen is very expensive.B. The food in the school canteen tastes delicious.C. A new cook will come to the school canteen soon.D. She doesn’t like the food in the school canteen.C. Listen to the passage and tell whether the following statements are true or false.15. Nancy jumped off a swing（秋千）and broke her dog.16. Nancy felt very sad, for she couldn’t take part in the spring dance performance.17. When Ms. Chang learnt Nancy’s leg was broken, she was nearly mad.18. Nancy refused to go on stage because the crutches（拐杖）looked stupid.19. Though Nancy’s cast（石膏夹）looked big and clumsy, she danced at night.20. Finally Nancy’s dance moved the audience so much that they gave her many roses.D. Listen to the passage and complete the following sentences21. The summer course teaches ______ ______ how to design computer games.22. The course enables you to get a chance to ______ ______ two top game designers.23. The course is from ______ ______ to August 14th this year, five more days than last year.24. You can pay ______ ______ online if you want to take the summer course.25. Please bring a photo of yourself and your ______ ______ when coming for the course.Part 2 Phonetics、Grammar and VocabularyII. Choose the best answer26. Which of the following words as pronounced as /mɑ:k/ ?A. matchB. MarchC. markD. math27. The teacher tells us that newspaper reading is ______ way to improve our English.A. aB. anC. theD. /28. Tom, you are the person I’m looking ______! Come to help me deal with the case.A. atB. forC. afterD. up29. The world is changing fast, and we ______ are unaware of what is going to happen.A. usB. ourC. oursD. ourselves30. We saw a couple of laptops, but ______ of them was really what we wanted.A. neitherB. allC. bothD. either31. We can get more ______ about international affairs on the Internet than before.A. reportB. bookC. informationD. suggestion32. --Do you know ______ Doris has been in the Science Club?--I guess she has been in it since she came to our school.A. how soonB. what timeC. how muchD. how long33. The mess along the river has been cleaned up, so the river no longer smells ______.A. badlyB. badC. goodD. well34. Steven asked the taxi driver to driver a little ______ because he had to catch the last train.A. quicklyB. the most quicklyC. more quicklyD. less quickly35. You’ll not make any progress ______ you get rid of your bad habit of study.A. becauseB. afterC. ifD. unless36. The British swimmer received a lot of cheers from the audience ______ he lost the race.A. as soon asB. thoughC. untilD. before37. You ______ hurry to the meeting now because it is put off till 12:30 at noon.A. shouldn’tB. needn’tC. can’tD. mustn’t38. Tim’s sister ______ as a waitress in a big restaurant for the time being.A. was workingB. workedC. has workedD. is working39. The lawyer ______ by a few reporters when he appears in the hall this afternoon.A. will be interviewedB. has been interviewedC. is interviewedD. was interviewed40. In my opinion, it is never a good idea to let your pet ______ whatever it wants.A. eatB. ateC. to eatD. eating41. The robber in the police station still denied ______ anything about the bank robbery.A. knowB. to knowC. knowingD. knew42. Be careful with your money when you are in a crowded underground, ______?A. don’t youB. won’t youC. do youD. will you43. ______ great fun it is to go fishing in the countryside at the weekend!A. HowB. WhatC. What aD. What an44. --Could you help me, James? There is something wrong with my smart phone.--______ I can put it right.A. That’s rightB. Never mindC. Don’t worryD. What a pity45. --Remember to give my best wishes to your parents.--______A. OK, I willB. It doesn’t matterC. It’s hard to sayD. Yes, pleaseIII. Complete the following passage with the words or phrases in the box. Each can be used only once.A. now thatB. joinedC. justD. right awayE. destroyedTwo men walked through the countryside toward another village. As they come to the edge of a river, they saw an old woman sitting there upset because the bridge was __46__ by the storm, and she was too weak to walk across the stream. The first man said __47__, “We are tall enough, and we can carry you across” The second man thought it troublesome, but he agreed reluctantly（不情愿地）. So the two men __48__ the bridge, lifted her between them and carried her across the river. When they got to the other side, they set her down and she went on her way gratefully. After they had walke d another mile or so, the second man began to complain “My back began to hurt for lifting her.” The first man __49__ smiled and nodded without a word.A. breathB. controlC. seriousD. the pastE. fartherThe second man complained every other mile, his back pain got more and more __50__. On the 5th mile, he couldn’t stand it any more and fell down on the grass. “My back is hurting me so badly. I can’t go any __51__ because of the pain and it is all because we had to carry that silly wom an across the river!” Out of __52__, he asked “Why aren’t you complaining about it? Doesn’t your back hurt?”“Of course not.” The first man replied. “You have been carrying the woman since we left the river bank. But I set her down five miles ago.”We ar e often like that second man who keeps on complaining and can’t get over the pain of __53__. Years later, we will still be carrying the burden, worn out and can’t go any further.IV. Complete the sentences with the given words in their proper form.54. When Tina was sad, her mother often told her some ______ to make her happy. (joke)55. The young couple plan to have a ______ baby in the following year. (two)56. Damin was a ______. He usually went fishing with a boat in the late afternoon. (fish)57. I ha dn’t seen Ander s for ages. When I appeared before him, he looked very ______. (surprise)58. A good diet should ______ plenty of fresh vegetables and fruits. (including)59. The rising number of cars made the air in the city become even ______. (bad)60. A ngela’s interest in Chinese literature ______ come from her parent. (main)61. The lady felt ______ and said that she would complain to the manager. (happy)V. Complete the following sentences as required62. Molly had to come to the airport at six that morning. （改为否定句）Molly ______ ______ to come to the airport at six that morning.63. Most sportsmen on the basketball team are tall and strong. （对画线部分提问）______ do most sportsmen on the basketball team ______ like?64. Don’t forget to say sorry to others when you do something wrong. （保持句意基本不变）Don’t forget to ______ ______ others when you do something wrong.65. “Have you ever been in a maglev train?” Our science teacher asked us. （合并成一句）Our science teacher asked us ______ we ______ ever been in a maglev train.66. Short-term memory can hold about seven item of information at a time. （改为被动语态）About seven item of information can ______ ______ at a time by short-term memory.67. Sometimes children are too young to tell the bad from the good. （保持句意基本不变）Sometimes children are ______ young ______ they can’t tell the bad from the good.68. Britain, with, travel around, you, a local tour guide, had better. （连词成句）____________________________________________________________Part 3 Reading and WritingVI. Reading comprehensionA. Choose the best answerMy favorite area in Britain is a country called Northumberland in the north-east of the country. I like it because it has mountains, the sea and history. The mountains are not very high. In China you would probably call them hills rather than mountains as they are less than 1,000 meters high, but there is something wild about these mountains you get a feeling of space and freedom. You can walk for miles without meeting another person.Northumberland is full of history. There are seven castles, some of them were ruined and the others still there as they were centuries ago. You can find graves going back to prehistoric（史前的）, times and strange carvings on rocks which nobody understands. The coast line is dramatic too, with beautiful sandy beaches. These beaches are rarely crowded because the weather is unpredictable and the North Sea is very cold! People don’t go for seaside holidays to Northumberland because of the cold sea and weather, so even in high season there aren’t many tourists.There is an island called Holy Island off the coast of Northumberland, you can get to the island by car or on foot when the tide is out. There is also one castle I particularly like. It is a 14th century castle which stands on a cliff right by the sea. The castle is almost completely ruined, butit looks dramatic and romantic because you can still see the gate and two of its owners. On a summer’s day you can lie on the beach nearby and let your mind wander as you look at this dream-like cas tle. On a winter’s day you can walk to the castle and watch the waves crash into the cliff, wondering how this castle has stood so long against the forces of nature.I once said to a friend of mine that I thought this castle by the sea was the most beautiful place in the world. She laughed and said there must be many more dramatic places in the world. In one way, I’m sure she’s right, but for me, it’s not just about what a place looks like, it’s about what it says to you.69. In China people probably call them mountains which are ______ 1,000 meters high.A. less thanB. nearlyC. more thanD. almost70. How are the seven castles in Northumberland?A. They are modern and fantastic.B. They are all complete and magnificent.C. Some hasn’t chang ed at all for centuries.D. Some are full of strange carvings.71. Not many people visit the beautiful beach because of ______.A. the soft sandsB. the cold sea and weatherC. the warm seaD. the island nearby72. Which of the following is NOT TRUE about the reason why the author likes the 14th century castle?A. It was built in the 14th century on a cliff right by the sea.B. It looks very dramatic and romantic with two towers but no gate.C. The author can let his mind wander as he looks at this dream-like castle.D. The author can walk to the castle and watch the waves crash into the cliff.73. From the last paragraph in the passage, we know ______.A. the author’s friend agreed on his opinion about the castle.B. the author doesn’t think there are many more dramatic places in the world.C. the author’s friend pays no attention to the beautiful scenery.D. what the author cares is not only the scenery but also the feeling he can get from it.74. You can get the passage from the following materials EXCEPT ______.A. science fictionB. journalsC. newspapersD. magazinesB. Choose the best answer and complete the passage.The first day of university our professor introduced himself and challenged us to get to know someone we di dn’t already know. I stood up to look around when a __75__ hand touched my shoulder. I turned around to find a wrinkled（有皱纹的）, little old lady with a smile. She __76__ a minute and said, “Hi, handsome. My name is Rose. I’m eighty-seven years old. Can I give you a hug?” I laughed and responded, “Of course you may!” and she gave me a big one.We became immediate friends. Every day for the next three months, we would leave class together and talk nonstop. I always loved listening to this ‘time machine’ __77__ she shared her wisdom and experience with me. Over the course of this year Rose became a campus role model and she __78__ made friends wherever she went. She loved to dress up and she loved the attention from the other students.At the end of the term we invited Rose to speak at our football club. I’ll never forget what she taught us. She was introduced and stepped up to the platform. As she began to deliver heprepared speech, she dropped her cards on the floor. A little upset she simply said, “I’m sorry I’m so nervous. I __79__ beer for Lent（大裔节）and this wine is killing me! I’ll never get my speech back in order …” As we laughed, she cleared her throat and began, “We do not stop playing because we are old; wo grow old because we stop playing. There is a huge __80__ between growing older and growing up. Anybody can grow older, but it does take talents and abilities to gro w up…”One week after graduation Rose died peacefully in her sleep. However, these words have been passed along in loving memory of ROSE.75. A. gentle B. cold C. hard D. awful76. A. left B. returned C. hesitated D. refused77. A. until B. but C. though D. as78. A. rarely B. easily C. suddenly D. carefully79. A. gave up B. put up C. took up D. turned up80. A. chain B. result C. deal D. differenceC. Fill in the blanks with proper words.Children grow quickly, especially their feet. But many families, cannot a__81__ new shoes when a child needs them. As a result, about 300 million children around the world go barefoot. Those children risk picking up diseases and parasites（寄生虫）from the soil.An American man has a s__82__ for those barefoot kids – a shoe that grows with the child. Kenton Lee is the creator of The Shoe That Grows. He explains how the shoe works and how it is able to last so long.“It grows in three places: the front, the side and the back with the child. It can last up to five years. The b__83__ is compressed（压缩的）rubber like tire rubber. The top is just high-quality leather.”The shoe comes in two sizes: small that fits children aged 4 to 9 and large for children aged 9 to 14. Lee says he got the idea for the shoe while working as a v__84__ in an orphanage in Kenya. “… and there was a little girl in a white dress walking next to me. And I just remember looking down and seeing how small her shoes were. And she had to c__85__ open the front of her shoes to let her toes（脚趾）stick out. At that time I just remember thinking, wouldn’t it be nice if there were a pair of shoes that could grow with her feet?” However, Lee says it was i__86__ to turn his idea into a reality at that time. “Yet I kept writing down I should do this because of this or because of that. All these reasons why it really was important for me to try to make the shoes grow are to try to help them.” Finally, in 2009 Lee founded a non-profit organization called Because International. Together, they have sent over 50,000 pairs of shoes to 70 countries. Lee says a pair shoes gives a child self-worth and more chances to succeed b__87__ much protection.D. Answer the questionsYou are invited to a large party. Loud music is playing, and lots of people are dancing. Do you dance or talk to as many people as you can call all night? Later, you cannot fall asleep—you want more conversation! Or do you prefer a quieter corner? Or perhaps you cannot wait to go home early and relax by yourself.Which of these people sound most like you? Person A, who tries to talk to everyone andstays late? Or Person B, who prefers to keep quiet and leaves early?If you said Person A, you are probably more extroverted（性格外向的）. If you said Person B, you are probably more introverted（内向的）. Or perhaps you are Person C and fall somewhere in the middle. Introverted and extroverted people are two commonly used words to describe a person’s personality. And they are also common ly misused and misunderstood.Introverts may be thought as quiet, shy and timid. Extroverts may be thought as bold, confident, loud and full of energy. Introverted and extroverted people may fit those descriptions. But these same descriptions do not define（下定义）introversion and extroversion properly.Introverts and extroverts use their brains differently, and they get their energy differently. Introversion is the state of being mostly concerned with one’s own mental life. Extroversion is the opposite. Extroversion is the state of being mostly concerned with what is outside oneself.People who consider themselves introverts may say they “need to be alone to charge their batteries”. However, introverts may still live being social and going to parties. But such activities require time to prepare.Extroverts may say, “I don’t need ‘alone time’, I feel more relaxed being around other people.” Even so, extroverts can still feel unsure or not confident among other people.So where do you fall on the introversion/ extroversion chart?88. If Person B is invited to a large party, what does he probably do?89. Which three words in this passage are used to describe introverts?90. What’s the main idea of the 5th paragraph?91. What do “such activities” refer to in par agraph 6?92. How do extroverts usually make themselves relaxed?93. Which personality do you prefer, introverted or extroverted? Show your reason!VII. Writing94. Write at least 60 words about the topic “I finished a task successfully” （请以‘我成功地完成了一项任务’为题，写一篇不少于60词的短文，标点符号不占格。

〖汇总3套试卷〗上海市长宁区2018年九年级上学期物理期末经典试题

初三上学期期末物理试卷一、选择题1．如图所示的两个电路中，电源电压相等，闭合开关S，当滑动变阻器的滑片P都向右滑动时，灯泡L1、L2的亮度变化是（）A．L1、L2都变亮B．L1、L2都变暗C．L1变亮，L2变暗D．L1变暗，L2的亮度不变【答案】D【解析】根据题中“当滑动变阻器的滑片P都向右滑动时，灯泡L1、L2的亮度变化是”可知，本题考查了电路的动态分析，涉及到滑动变阻器和欧姆定律、串并联电路特点的应用，关键是知道灯泡的亮暗取决于实际功率的大小。

【详解】左图中灯泡L1与滑动变阻器串联，当滑动变阻器的滑片P向右滑动时，接入电路中的电阻变大，电路中的总电阻变大，由可知，电路中的电流变小，因灯泡的亮暗取决于实际功率的大小，所以，由可知灯泡的实际功率变小，灯泡变暗；右图中灯泡L2与滑动变阻器并联，因并联电路中各支路独立工作、互不影响，所以，滑片移动时，灯泡L2的实际功率不变，亮暗不变；故D正确。

2．小明同学将定值电阻R与滑动变阻器接入电源电压不变的电路中，如图所示闭合开关S，各表均有一定示数，滑动变阻器的滑片向右滑动到某一位置过程中，电流表、电压表的示数变化量分别为△I、△U1、△U1．下列说法正确的是A．V1示数不变，V1示数变大B．V1示数变小，V1示数和电流表示数之比变小C．电流表示数变小，△U1和△I之比不变D．电流表示数变小，△U1和△I之比变小【答案】C【详解】A．在串联电路中，电阻具有分压作用。

滑动变阻器滑片向右移动过程中，滑动变阻器接入电路电阻增大，根据串联电路用电器两端电压与其阻值成正比知，滑动变阻器两端电压增大，即电压表V1示数增大，而电源电压一定，所以电压表V1示数减小。

此选项错误；B．由A知，电压表V1示数减小，但定值电阻阻值一定，所以V1示数和电流表示数之比不变，此选项错误；C．定值电阻阻值不变，滑动变阻器滑片向右移动过程中，滑动变阻器接入电路电阻增大，电路总电阻增大，电源电压一定，由欧姆定律知，电路电流减小，所以电流表示数减小。

〖汇总3套试卷〗上海市长宁区2018年九年级上学期数学期末经典试题

九年级上学期期末数学试卷一、选择题（本题包括10个小题，每小题只有一个选项符合题意）1．已知二次函数y ＝ax 2+bx+c （a ≠0）的图象如图所示，给出以下结论：①a+b+c ＜0；②b 2﹣4ac ＞0；③b ＞0；④4a ﹣2b+c ＜0；⑤a+c ＜23，其中正确结论的个数是（）A ．②③④B ．①②⑤C ．①②④D ．②③⑤【答案】B 【分析】令x ＝1，代入抛物线判断出①正确；根据抛物线与x 轴的交点判断出②正确；根据抛物线的对称轴为直线x ＝﹣1列式求解即可判断③错误；令x ＝﹣2，代入抛物线即可判断出④错误，根据与y 轴的交点判断出c ＝1，然后求出⑤正确．【详解】解：由图可知，x ＝1时，a+b+c ＜0，故①正确；∵抛物线与x 轴有两个交点，∴△＝24b ac -＞0，故②正确；∵抛物线开口向下，∴a ＜0，∵抛物线对称轴为直线x ＝2b a-＝﹣1， ∴b ＝2a ＜0，故③错误；由图可知，x ＝﹣2时，4a ﹣2b+c ＞0，故④错误；当x ＝0时，y ＝c ＝1，∵a+b+c ＜0，b ＝2a ，∴3a+1＜0， ∴a ＜13-∴a+c ＜23，故⑤正确；综上所述，结论正确的是①②⑤．故选：B ．【点睛】本题主要考查二次函数的图像与性质，关键是根据题意及图像得到二次函数系数之间的关系，熟记知识点是前提．2．已知点A（2，y1）、B（4，y2）都在反比例函数kyx（k＜0）的图象上，则y1、y2的大小关系为（）A．y1＞y2B．y1＜y2C．y1=y2D．无法确定【答案】B【详解】试题分析：∵当k＜0时，y=kx在每个象限内，y随x的增大而增大，∴y1＜y2，故选B.考点：反比例函数增减性.3．二次函数y＝ax2+bx+c的部分对应值如下表利用二次函数的图象可知，当函数值y＞0时，x的取值范围是（）A．0＜x＜2 B．x＜0或x＞2 C．﹣1＜x＜3 D．x＜﹣1或x＞3【答案】C【分析】函数值y=1对应的自变量值是:-1、3，在它们之间的函数值都是正数．由此可得y＞1时,x的取值范围．【详解】从表格可以看出,二次函数的对称轴为直线x＝1,故当x＝﹣1或3时,y＝1;因此当﹣1＜x＜3时,y＞1．故选C．【点睛】本题主要考查了二次函数与x轴的交点、二次函数的性质等知识, 解题的关键是要认真观察,利用表格中的信息解决问题．4．抛物线y=﹣（x﹣1）2﹣2 的顶点坐标是（）A．（1，2）B．（﹣1，﹣2）C．（﹣1，2）D．（1，﹣2）【答案】D【解析】根据顶点式解析式写出顶点坐标即可．【详解】抛物线y=﹣（x﹣1）2﹣2的顶点坐标是（1，﹣2）．故选D．【点睛】本题考查了二次函数的性质，熟练掌握利用顶点式解析式求顶点坐标的方法是解题的关键．5．下列说法中错误的是（）A．成中心对称的两个图形全等B．成中心对称的两个图形中，对称点的连线被对称轴平分D ．中心对称图形绕对称中心旋转180°后，都能与自身重合【答案】B【解析】试题分析：在平面内，把一个图形绕着某个点旋转180°，如果旋转后的图形与另一个图形重合，那么就说明这两个图形的形状关于这个点成中心对称中心对称，中心对称图形的对称中心是对称点连线的交点，根据中心对称图形的定义和性质可知A 、C 、D 正确，B 错误．故选B ．考点：中心对称．6．如图是抛物线y 1＝ax 2＋bx ＋c(a≠0)图象的一部分，抛物线的顶点坐标A(1，3)，与x 轴的一个交点B(4，0)，直线y 2＝mx ＋n(m≠0)与抛物线交于A ，B 两点，下列结论：①2a ＋b ＝0；②abc>0；③方程ax 2＋bx ＋c ＝3有两个相等的实数根；④抛物线与x 轴的另一个交点是(－1，0)；⑤当1<x<4时，有y 2<y 1，其中正确的是（）A ．①④⑤B ．①③④⑤C ．①③⑤D ．①②③【答案】C 【分析】①根据对称轴x=1，确定a ，b 的关系，然后判定即可；②根据图象确定a 、b 、c 的符号，即可判定；③方程ax 2+bx+c=3的根，就y=3的图象与抛物线交点的横坐标判定即可；④根据对称性判断即可；⑤由图象可得，当1<x<4时，抛物线总在直线的上面，则y 2<y 1．【详解】解：①∵对称轴为：x=1， ∴12b a-= 则a=-2b,即2a+b=0，故①正确; ∵抛物线开口向下∴a ＜0∵对称轴在y 轴右侧，∴b ＞0∵抛物线与y 轴交于正半轴∴c ＞0∴abc<0,故②不正确；∴方程ax2+bx+c=3有两个相等的实数根是x=1，故③正确；∵抛物线对称轴是：x=1，B（4,0），∴抛物线与x轴的另一个交点是（-2,0）故④错误；由图象得：当1<x<4时，有y2<y1；故⑤正确．故答案为C．【点睛】本题考查了二次函数的图像,考查知识点较多,解答的关键在于掌握并灵活应用二次函数知识．7．下列四个图形中，既是中心对称图形，又是轴对称图形的是（）A．B．C．D．【答案】D【分析】根据轴对称图形与中心对称图形的概念，并结合图形的特点求解．【详解】解：A、不是轴对称图形，是中心对称图形，故选项错误；B、不是轴对称图形，是中心对称图形，故选项错误；C、是轴对称图形，不是中心对称图形，故选项错误；D、是轴对称图形，是中心对称图形，故选项正确．故选：D．【点睛】本题考查了中心对称图形与轴对称图形的概念．轴对称图形的关键是寻找对称轴，图形沿对称轴折叠后可重合；中心对称图形关键是要寻找对称中心，图形旋转180°后与原图重合．8．在Rt△ABC中，∠C=90°，3A的度数是( )A．30°B．45°C．60°D．90°【答案】C【解析】试题分析：根据特殊角的三角函数值可得：∠A=60°．9．在Rt△ABC中，∠C＝90°，若BC＝3，AC＝4，则sinB的值为（）A．45B．35C．34D．43【答案】A【分析】根据三角函数的定义解决问题即可．【详解】解：如图，在Rt△ABC中，∵∠C ＝90°，BC ＝3，AC ＝4，∴AB 2222435AB BC +=+=， ∴sinB ＝AC AB ＝45故选：A ．【点睛】本题考查解直角三角形的应用，解题的关键是熟练掌握基本知识，属于中考常考题型．10．下列数是无理数的是（）A ．32B ．0C ．3πD ．0.2-【答案】C【分析】根据无理数的定义进行判断即可．【详解】A. 32，有理数； B. 0，有理数； C. 3π，无理数； D. 0.2-，有理数；故答案为：C ．【点睛】本题考查了无理数的问题，掌握无理数的定义是解题的关键．11．对于函数4y x=，下列说法错误的是（） A ．这个函数的图象位于第一、第三象限B ．这个函数的图象既是轴对称图形又是中心对称图形C ．当x ＞0时，y 随x 的增大而增大D ．当x ＜0时，y 随x 的增大而减小【答案】C【解析】试题分析：根据反比例函数的图像与性质，可由题意知k=4＞0，其图像在一三象限，且在每个象限y 随x 增大而减小，它的图像即是轴对称图形又是中心对称图形.点睛：反比例函数k y x =的图像与性质： 1、当k ＞0时，图像在一、三象限，在每个象限内，y 随x 增大而减小；2、当k ＜0时，图像在二、四象限，在每个象限内，y 随x 增大而增大.3、反比例函数的图像即是轴对称图形又是中心对称图形. 12．姜老师给出一个函数表达式，甲、乙、丙三位同学分别正确指出了这个函数的一个性质．甲：函数图像经过第一象限；乙：函数图像经过第三象限；丙：在每一个象限内，y 值随x 值的增大而减小．根据他们的描述，姜老师给出的这个函数表达式可能是（）A ．3y x =B ．3y x =C ．1y x =-D ．2y x【答案】B【解析】y=3x 的图象经过一三象限过原点的直线，y 随x 的增大而增大，故选项A 错误； y=3x的图象在一、三象限，在每个象限内y 随x 的增大而减小，故选项B 正确； y=−1x 的图象在二、四象限，故选项C 错误； y=x ²的图象是顶点在原点开口向上的抛物线，在一、二象限，故选项D 错误；故选B.二、填空题（本题包括8个小题）13．某物体对地面的压强P （Pa ）与物体和地面的接触面积S （m 2）成反比例函数关系（如图），当该物体与地面的接触面积为0.25m 2时，该物体对地面的压强是______Pa ．【答案】1【分析】直接利用函数图象得出函数解析式，进而求出答案．【详解】设P ＝k s ，把（0.5，2000）代入得： k ＝1000，故P ＝1000s，当S ＝0.25时，P ＝10000.25＝1（Pa ）．故答案为：1．此题主要考查了反比例函数的应用，正确求出函数解析会死是解题关键．14．若x y ＝2，则-x x y ＝_____．【答案】1【分析】根据x y=1，得出x =1y ，再代入要求的式子进行计算即可．【详解】∵x y =1， ∴x =1y ，∴222x y x y y y==--；故答案为：1．【点睛】本题主要考查了比例的基本性质．解答此题的关键是根据比例的基本性质求得x =1y ．15．已知菱形ABCD 中，120A ∠=︒，4AB =，边,AD CD 上有点E 、点F 两动点，始终保持DE DF =，连接,,BE EF 取BE 中点G 并连接,FG 则FG 的最小值是_______．【答案】1【分析】过D 点作DH ⊥BC 交BC 延长线与H 点，延长EF 交DH 与点M ，连接BM ．由菱形性质和120A ∠=︒可证明FM DF EF DE ===，进而可得12FG BM =，由BM 最小值为BH 即可求解．【详解】解：过D 点作DH ⊥BC 交BC 延长线与H 点，延长EF 交DH 与点M ，连接BM ．∴60ADC ∠=︒，DH BC ⊥，∴30HDC ∠=︒，∵DE DF =，60ADC ∠=︒，∴EF DE DF ==，∴60DEF ∠=︒，又∵DH BC ⊥，∴30MDF FMD ∠=∠=︒，∴FM DF EF ==，又∵BG EG =， ∴12FG BM =， ∴当BM 最小时FG 最小，根据点到直线的距离垂线段最短可知，BM 的最小值等于BH ，∵在菱形ABCD 中， 4AB =，∴4AB BC CD ===又∵在Rt △CHD 中，30HDC ∠=︒， ∴122CH CD ==， ∴426BH BC CH =+=+=，∴AM 的最小值为6，∴FG 的最小值是1．故答案为：1．【点睛】本题考查了动点线段的最小值问题，涉及了菱形的性质、等腰三角形性质和判定、垂线段最短、中位线定理等知识点；将“两动点”线段长通过中位线转化为“一定一动”线段长求解是解题关键．16．在本赛季CBA 比赛中，某运动员最后六场的得分情况如下：17,15,21,28,12,19,则这组数据的极差为_______．【答案】1【分析】极差是指一组数据中最大数据与最小数据的差．极差＝最大值−最小值，根据极差的定义即可解答．【详解】解：由题意可知，极差为28−12＝1，故答案为：1．【点睛】17．如图，P （m ，m ）是反比例函数9y x =在第一象限内的图象上一点，以P 为顶点作等边△PAB ，使AB 落在x 轴上，则△POB 的面积为_____．【答案】9332+ ．【解析】如图，过点P 作PH ⊥OB 于点H ，∵点P （m ，m ）是反比例函数y=9x在第一象限内的图象上的一个点， ∴9=m 2，且m ＞0，解得，m=3.∴PH=OH=3.∵△PAB 是等边三角形，∴∠PAH=60°.∴根据锐角三角函数，得AH=3.∴OB=3+3∴S △POB =12OB•PH=933+. 18．如图所示是二次函数2y ax bx c =++的图象，下列结论：①二次三项式2ax bx c ++的最大值为4；②使3y ≤成立的x 的取值范围是2x -≤；③一元二次方程2ax bx c k ++=，当4k <时，方程总有两个不相等的实数根；④该抛物线的对称轴是直线1x =-；420a b c -+<⑤其中正确的结论有______________ (把所有正确结论的序号都填在横线上)【答案】①③④【分析】根据图象求出二次函数的解析式，根据二次函数的性质结合图象可以判断各个小题中的结论是否正确．【详解】由函数图象可知：抛物线过(-3，0)，(1，0)，(0，3)，∴设抛物线解析式为(1)(3)y a x x =-+，把(0，3)代入得：3=(1)(3)a ⨯-⨯，解得：a=－1， ∴抛物线为(1)(3)y x x =--+，即2(1)4y x =-++，∴二次三项式ax 2+bx+c 的最大值为4，故①正确，由2(1)4y x =-++=3，解得：x=0或x=-2，由图像可知：使y ≤3成立的x 的取值范围是x ≤﹣2或x ≥0，故②错误．∵二次三项式ax 2+bx+c 的最大值为4，∴当k ＜4时，直线y=k 与抛物线2y ax bx c =++有两个交点，∴当k ＜4时，方程一元二次方程2ax bx c k ++=总有两个不相等的实数根，故③正确，该抛物线的对称轴是直线x=﹣1，故④正确，当x=﹣2时，y=4a ﹣2b+c ＞0，故⑤错误．故答案为：①③④．【点睛】本题考查了二次函数图象与系数的关系、二次函数的最值、抛物线与x 轴的交点，解答本题的关键是明确题意，利用二次函数的性质和数形结合的思想解答．三、解答题（本题包括8个小题）19．问题提出：如图1，在等边△ABC 中，AB ＝9，⊙C 半径为3，P 为圆上一动点，连结AP ，BP ，求AP+13BP 的最小值 (1)尝试解决：为了解决这个问题，下面给出一种解题思路，通过构造一对相似三角形，将13BP 转化为某一条线段长，具体方法如下：(请把下面的过程填写完整)如图2，连结CP ，在CB 上取点D ，使CD ＝1，则有13==CD CP CP CB△∽△∴13= PD BP∴PD＝13 BP∴AP+13BP＝AP+PD∴当A，P，D三点共线时，AP+PD取到最小值请你完成余下的思考，并直接写出答案：AP+13BP的最小值为．(2)自主探索：如图3，矩形ABCD中，BC＝6，AB＝8，P为矩形内部一点，且PB＝1，则12AP+PC的最小值为．(请在图3中添加相应的辅助线)(3)拓展延伸：如图1，在扇形COD中，O为圆心，∠COD＝120°，OC＝1．OA＝2，OB＝3，点P是CD上一点，求2PA+PB 的最小值，画出示意图并写出求解过程．【答案】（1）BCP，PCD，BCP，259；（2）10；（3）作图与求解过程见解析，2PA+PB97．【分析】(1)连结AD，过点A作AF⊥CB于点F，AP+13BP＝AP+PD，要使AP+13BP最小，AP+AD最小，当点A，P，D在同一条直线时，AP+AD最小，即可求解；(2)在AB上截取BF＝2，连接PF，PC，AB＝8，PB＝1，BF＝2，证明△ABP∽△PBF，当点F，点P，点C 三点共线时，AP+PC的值最小，即可求解；(3)延长OC，使CF＝1，连接BF，OP，PF，过点F作FB⊥OD于点M，确定12OA OPOP OF==，且∠AOP＝∠AOP，△AOP∽△POF，当点F，点P，点B三点共线时，2AP+PB的值最小，即可求解．【详解】解：(1)如图1，连结AD，过点A作AF⊥CB于点F，∵AP+13BP＝AP+PD，要使AP+13BP最小，∴AP+AD最小，当点A，P，D在同一条直线时，AP+AD最小，即：AP+13BP最小值为AD，∵AC＝9，AF⊥BC，∠ACB＝60°∴CF＝3，AF＝93；∴DF＝CF﹣CD＝3﹣1＝2，∴AD＝22259 =2AF DF+，∴AP+13BP的最小值为2592；故答案为：259；(2)如图2，在AB上截取BF＝2，连接PF，PC，∵AB＝8，PB＝1，BF＝2，∴12BP BFAB BP==，且∠ABP＝∠ABP，∴△ABP∽△PBF，∴12 FP BPAP AB==，∴PF＝12 AP，∴12AP+PC＝PF+PC，∴当点F，点P，点C三点共线时，AP+PC的值最小，∴CF＝222262210BF BC+=+=，∴12AP+PC的值最小值为210，故答案为：210；(3)如图3，延长OC，使CF＝1，连接BF，OP，PF，过点F作FB⊥OD于点M，∵OC＝1，FC＝1，∴FO＝8，且OP＝1，OA＝2，∴12OA OPOP OF==，且∠AOP＝∠AOP∴△AOP∽△POF∴1=2 AP OAPF OF=，∴PF＝2AP∴2PA+PB＝PF+PB，∴当点F，点P，点B三点共线时，2AP+PB的值最小，∵∠COD＝120°，∴∠FOM＝60°，且FO＝8，FM⊥OM∴OM＝1，FM＝3∴MB＝OM+OB＝1+3＝7∴FB2297FM MB+，∴2PA+PB的最小值为97．【点睛】本题主要考查了圆的有关知识，勾股定理，相似三角形的判定和性质，解本题的关键是根据材料中的思路构造出相似三角形..20．如图所示是某路灯灯架示意图，其中点A表示电灯，AB和BC为灯架，l表示地面，已知AB＝2m，BC＝5.7m，∠ABC＝110°，BC⊥l于点C，求电灯A与地面l的距离．（结果精确到0.1m．参考数据：sin20°≈0.34，cos20°≈0.94，tan20°≈0.36）【答案】电灯A距离地面l的高度为6.4米．【分析】过A作AD⊥l，过B作BE⊥AD于E，则DE＝BC＝5.7m，解直角三角形即可得到结论．【详解】解：过A作AD⊥l，过B作BE⊥AD于E，则DE＝BC＝5.7m，∵∠ABC＝110°，∴∠ABE＝20°，∴∠A＝70°，∴sin20°＝AEAB ＝AE2＝0.34，解得：AE＝0.68，∴AD＝AE+DE≈6.4；答：电灯A距离地面l的高度为6.4米．【点睛】考核知识点：解直角三角形应用.构造直角三角形，解直角三角形是关键.21．不透明的袋中装有1个红球与2个白球，这些球除颜色外都相同，将其搅匀.（1）从中摸出1个球，恰为红球的概率等于_________；（2）从中同时摸出2个球，摸到红球的概率是多少？（用画树状图或列表的方法写出分析过程）【答案】（1）13（2）23【解析】（1）根据题意和概率公式求出即可；（2）先画出树状图，再求即可．【详解】（1）由题意得，从中摸出1个球，恰为红球的概率等于13．故答案为13；（2）画树状图：所以共有6种情况，含红球的有4种情况，所以p42 63 ==．答：从中同时摸出2个球，摸到红球的概率是23．【点睛】本题考查了列表法与画树状图，概率公式等知识点，能够正确画出树状图是解答此题的关键．22．青青草原上，灰太狼每天都想着如何抓羊，而且是屡败屡试，永不言弃.（如图所示）一天，灰太狼在自家城堡顶部A处测得懒羊羊所在地B处的俯角为60°，然后下到城堡的C处，测得B处的俯角为30°.已知AC=50米，若灰太狼以5米/秒的速度从城堡底部D处出发，几秒钟后能抓到懒羊羊？（结果保留根号）【答案】灰太狼3【分析】根据已知得出AC=BC，进而利用解直角三角形得出BD的长进一步可得到结果．【详解】解；在Rt△BCD中∵∠BCD=90-30=60，∠CBD=30∴AC=BC=50m ，在Rt△BCD中∴sin60=BD BC∴BD=BCsin60=502⨯=，设追赶时间为ts,由题意得：5t=∴t=s答：灰太狼秒钟后能抓到懒羊羊．【点睛】此题考查解直角三角形的应用．注意能借助俯角构造直角三角形并解直角三角形是解题的关键，注意数形结合思想的应用．23．已知反比例函数的图像经过点（2，-3）．（1）求这个函数的表达式．（2）点（-1，6），（3，2）是否在这个函数的图像上？（3）这个函数的图像位于哪些象限？函数值y随自变量x的增大如何变化？【答案】（1）y=-6x；（2）(-1，6)在函数图像上，(3，2)不在函数图像上；（3）二、四象限，在每个象限内，y随x的增大而增大．【分析】（1）根据待定系数法求得即可；（2）根据图象上点的坐标特征，把点(﹣1，6)，(3，2)代入解析式即可判断；（3）根据反比例函数的性质即可得到结论．【详解】（1）设反比例函数的解析式为ykx=(k≠0)．∵反比例函数的图象经过点(2，﹣3)，∴k=2×(﹣3)=﹣6，∴反比例函数的表达式y6x =-；（2）把x=﹣1代入y6x=-得：y=6，把x=3代入y6x=-得：y=﹣2≠2，∴点(﹣1，6)在函数图象上，点(3，2)不在函数图象上．（3）∵k=﹣6＜0，∴双曲线在二、四象限，在每个象限内y随x的增大而增大．【点睛】本题考查了待定系数法求反比例函数的解析式，反比例函数的性质，反比例函数图象上点的坐标特征，熟练掌握待定系数法以及反比例函数的性质是解答本题的关键．24．为了解某小区居民使用共享单车次数的情况，某研究小组随机采访该小区的10位居民，得到这10位居民一周内使用共享单车的次数统计如下：（1）这10位居民一周内使用共享单车次数的中位数是次，众数是次．（2）若小明同学把数据“20”看成了“30”，那么中位数，众数和平均数中不受影响的是．（填“中位数”，“众数”或“平均数”）（3）若该小区有2000名居民，试估计该小区居民一周内使用共享单车的总次数．【答案】（1）10,10；（2）中位数和众数；（3）22000【分析】（1）根据众数、中位数和平均数的定义分别求解可得；（2）由中位数和众数不受极端值影响可得答案；（3）用总人数乘以样本中居民的平均使用次数即可得．【详解】解：（1）这10位居民一周内使用共享单车次数的中位数是：1010=102+（次），根据使用次数可得：众数为10次；（2）把数据“20”看成了“30”，那么中位数，众数和平均数中不受影响的是中位数和众数，故答案为：中位数和众数；（3）平均数为01511041532011110⨯+⨯+⨯+⨯+⨯=（次），11200022000⨯=（次）估计该小区居民一周内使用共享单车的总次数为22000次．【点睛】本题考查的是平均数、众数、中位数的定义及其求法，牢记定义是关键．25．小明本学期4次数学考试成绩如下表如示：（1）小明4次考试成绩的中位数为__________分，众数为______________分；（2）学校规定：两次月考的平均成绩作为平时成绩，求小明本学期的平时成绩；（3）如果本学期的总评成绩按照平时成绩占20%、期中成绩占30%、期末成绩占50%计算，那么小明本学期的数学总评成绩是多少分？【答案】（1）139，138；（2）140分；（3）139分【分析】（1）根据中位数和众数的定义解答；（2）根据平均数的定义求解；（3）根据加权平均数的计算方法求解.【详解】解：（1）将4个数按照从小到大的顺序排列为：138，138，140，142，所以中位数是1381401392+=分，众数是138分；故答案为：139，138；（2）()1381422140+÷=（分），∴小明的平时成绩为140分；（3）14020%14030%13850%13920%30%50%⨯+⨯+⨯=++（分） ∴小明本学期的数学总评成绩为139分.【点睛】本题是有关统计的综合题，主要考查了中位数、众数和平均数的知识，属于基础题型，熟练掌握以上基本知识是解题关键.26． “万州古红桔”原名“万县红桔”，古称丹桔（以下简称为红桔），种植距今至少已有一千多年的历史，“玫瑰香橙”（源自意大利西西里岛塔罗科血橙，以下简称香橙）现已是万州柑橘发展的主推品种之一．某水果店老板在2017年11月份用15200元购进了400千克红桔和600千克香橙，已知香橙的每千克进价比红桔的每千克进价2倍还多4元．（1）求11月份这两种水果的进价分别为每千克多少元？（2）时下正值柑橘销售旺季，水果店老板决定在12月份继续购进这两种水果，但进入12月份，由于柑橘的大量上市，红桔和香橙的进价都有大幅下滑，红桔每千克的进价在11月份的基础上下降了12m %，香橙每千克的进价在11月份的基础上下降了m %，由于红桔和“玫瑰香橙”都深受库区人民欢迎，实际水果店老板在12月份购进的红桔数量比11月份增加了5m 8%，香橙购进的数量比11月份增加了2m %，结果12月份所购进的这两种柑橘的总价与11月份所购进的这两种柑橘的总价相同，求m 的值．【答案】（1）11月份红桔的进价为每千克8元，香橙的进价为每千克20元；（2）m 的值为49.1．【解析】（1）设11月份红桔的进价为每千克x 元，香橙的进价为每千克y 元，依题意有4006001520024x y y x +=⎧⎨=+⎩，解得820x y =⎧⎨=⎩，答：11月份红桔的进价为每千克8元，香橙的进价为每千克20元；（2）依题意有：8（1﹣12m%）×400（1+58m%）+20（1﹣m%）×100（1+2m%）=15200，解得m 1=0（舍去），m 2=49.1，故m 的值为49.1．27．如图，在等腰三角形ABC 中，,AB AC AH BC =⊥于点H ，点E 是AH 上一点，延长AH 至点F ，使FH EH =.求证：四边形EBFC 是菱形.【答案】见解析.【分析】根据等腰三角形的三线合一可得BH=HC ，结合已知条件FH EH =，从而得出四边形EBFC 是平行四边形，再根据AH CB ⊥得出四边形EBFC 是菱形．【详解】证明：,AB AC AH CB =⊥，BH HC ∴=FH EH =，∴四边形EBFC 是平行四边形又AH CB ⊥，∴四边形EBFC 是菱形.【点睛】本题考查了菱形的判定和性质，以及等腰三角形的性质，熟练掌握相关的知识是解题的关键．九年级上学期期末数学试卷一、选择题（本题包括10个小题，每小题只有一个选项符合题意）1．如图，AB 为O 的直径，,C D 为O 上两点，若40BCD ∠︒＝，则ABD ∠的大小为（）．A ．60°B ．50°C ．40°D ．20°【答案】B 【分析】根据题意连接AD ，再根据同弧的圆周角相等，即可计算的ABD ∠的大小.【详解】解：连接AD ，∵AB 为O 的直径，∴90ADB ∠=︒．∵40BCD ∠=︒，∴40A BCD ∠=∠=︒，∴904050ABD ∠=︒-︒=︒．故选B ．【点睛】本题主要考查圆弧的性质，同弧的圆周角相等,这是考试的重点，应当熟练掌握.2．如图是二次函数2 23y x x =--+的图象，使0y ≥成立的 x 的取值范围是（）A ．31x ≤≤－B ．1x ≥C ．31x x <->或D ．31x x ≤-≥或【答案】A【分析】先找出抛物线与x 轴的交点坐标，根据图象即可解决问题．【详解】解：由图象可知，抛物线与x 轴的交点坐标分别为（-3，0）和（1，0），∴0y ≥时，x 的取值范围为31x ≤≤－．故选：A ．【点睛】本题考查抛物线与x 轴的交点，对称轴等知识，解题的关键是学会数形结合,根据图象确定自变量的取值范围，属于中考常考题型．3．天虹商场一月份鞋帽专柜的营业额为100万元，三月份鞋帽专柜的营业额为150万元．设一到三月每月平均增长率为x ，则下列方程正确的是（）A ．100（1+2x ）＝150B ．100（1+x ）2＝150C ．100（1+x ）+100（1+x ）2＝150D ．100+100（1+x ）+100（1+x ）2＝150【答案】B【分析】可设每月营业额平均增长率为x ，则二月份的营业额是100（1+x ），三月份的营业额是100（1+x ）（1+x ），则可以得到方程即可．【详解】设二、三两个月每月的平均增长率是x ．根据题意得：100（1+x ）1＝150，故选：B ．【点睛】本题考查数量平均变化率问题．原来的数量为a ，平均每次增长或降低的百分率为x 的话，经过第一次调整，就调整到a×（1±x ），再经过第二次调整就是a （1±x ）（1±x ）=a （1±x ）1．增长用“+”，下降用“-”． 4．抛物线2245y x x =++的顶点坐标为( )A ．(1,3)B ．(1,3)-C ．(1,5)D ．(1,5)- 【答案】B 【分析】利用顶点公式24,24b ac b a a ⎛⎫-- ⎪⎝⎭，进行计算【详解】2245y x x =++()()()222242322113213x x x x x =+++=+++=++∴顶点坐标为(1,3)-故选B.【点睛】本题考查二次函数的性质，熟练运用抛物线顶点的公式是解题关键.5．下列事件中，是必然事件的是（）A ．从装有10个黑球的不透明袋子中摸出一个球，恰好是红球B ．抛掷一枚普通正方体骰子，所得点数小于7C ．抛掷一枚一元硬币，正面朝上D ．从一副没有大小王的扑克牌中抽出一张，恰好是方块【答案】B【解析】根据事件发生的可能性大小即可判断.【详解】A. 从装有10个黑球的不透明袋子中摸出一个球，恰好是红球的概率为0，故错误；B. 抛掷一枚普通正方体骰子，所得点数小于7的概率为1，故为必然事件，正确；C. 抛掷一枚一元硬币，正面朝上的概率为50%，为随机事件，故错误；D. 从一副没有大小王的扑克牌中抽出一张，恰好是方块，为随机事件，故错误；故选B.【点睛】此题主要考查事件发生的可能性，解题的关键是熟知概率的定义.6．在数学活动课上，张明运用统计方法估计瓶子中的豆子的数量．他先取出100粒豆子，给这些豆子做上记号，然后放回瓶子中，充分摇匀之后再取出100粒豆子，发现其中8粒有刚才做的记号，利用得到的数据可以估计瓶子中豆子的数量约为（）粒．A ．125B ．1250C ．250D ．2500 【答案】B【解析】设瓶子中有豆子x 粒，根据取出100粒刚好有记号的8粒列出算式，再进行计算即可．【详解】设瓶子中有豆子x 粒豆子，根据题意得：1008100x =，解得：1250x ＝，经检验：1250x ＝是原分式方程的解，答：估计瓶子中豆子的数量约为1250粒．故选：B．【点睛】本题考查了用样本的数据特征来估计总体的数据特征，利用样本中的数据对整体进行估算是统计学中最常用的估算方法．7．如图所示的几何体的左视图为（）A．B．C．D．【答案】D【解析】根据左视图是从几何体左面看得到的图形，认真观察实物，可得这个几何体的左视图为长方形，据此观察选项即可得.【详解】观察实物，可知这个几何体的左视图为长方形，只有D选项符合题意，故选D.【详解】本题考查了几何体的左视图，明确几何体的左视图是从几何体的左面看得到的图形是解题的关键.注意错误的选项B、C.8．如图，点O为△ABC的外心，点I为△ABC的内心，若∠BOC=140°，则∠BIC的度数为( )A．110°B．125°C．130°D．140°【答案】B【解析】解：∵点O为△ABC的外心，∠BOC=140°，∴∠A=70°，∴∠ABC+∠ACB=110°，∵点I为△ABC的内心，∴∠IBC+∠ICB=55°，∴∠BIC=125°．故选B.9．如图所示的几何体的左视图是（）A．B．C．D．【答案】D【分析】根据左视图是从左边看得到的图形，可得答案．【详解】从左边看一个正方形被分成两部分，正方形中间有一条横向的虚线，如图：故选：D．【点睛】本题考查了几何体的三视图，从左边看得到的是左视图．中，CD是斜边AB上的高，则图中的相似三角形共有（）10．如图，在Rt ABCA．1对B．2对C．3对D．4对【答案】C【分析】根据相似三角形的判定定理及已知即可得到存在的相似三角形．【详解】∵∠ACB＝90°，CD⊥AB∴△ABC∽△ACD，△ACD∽△CBD，△ABC∽△CBD所以有三对相似三角形，故选：C．【点睛】考查相似三角形的判定定理：（1）两角对应相等的两个三角形相似；（2）两边对应成比例且夹角相等的两个三角形相似；（3）三边对应成比例的两个三角形相似．11．布袋中有红、黄、蓝三种颜色的球各一个，从中摸出一个球之后不放回布袋，再摸第二个球，这时得到的两个球的颜色中有“一红一黄”的概率是（）A ．16B ．29C ．13D ．23【答案】C【解析】解：画树状图如下：一共有6种情况，“一红一黄”的情况有2种，∴P （一红一黄）=26=13．故选C ． 12．关于x 的一元二次方程230x x m -+=中有一根是1，另一根为n ，则m 与n 的值分别是（） A ．m=2，n=3B ．m=2，n=-3C ．m=2，n=2D ．m=2，n=-2【答案】C【分析】将根是1代入一元二次方程，即可求出m 的值，再解一元二次方程，可求出两个根，即可求出n 的值．【详解】解：∵将1代入方程，得到：1-3+m=0，m=2∴2320x x -+=∴解得x 1=1，x 2=2∴n=2故选C ．【点睛】本题主要考查了一元二次方程，熟练解满足一元二次方程以及解一元二次方程是解决本题的关键．二、填空题（本题包括8个小题）13．如图，在一张矩形纸片ABCD 中，AB=4，BC=8，点E ，F 分别在AD ，BC 上，将纸片ABCD 沿直线EF 折叠，点C 落在AD 上的一点H 处，点D 落在点G 处，有以下四个结论：①四边形CFHE 是菱形；②EC 平分∠DCH ；③线段BF 的取值范围为3≤BF≤4；④当点H 与点A 重合时，5以上结论中，你认为正确的有．（填序号）。

上海市长宁区2018届九年级上期末质量检测数学试题有答案-优质资料

2017-2018学年第一学期初三数学教学质量检测试卷（考试时间：100分钟满分：150分）2018.01一、选择题（本大题共6题, 每题4分, 满分24分）【每小题只有一个正确选项, 在答题纸相应题号的选项上用2B 铅笔正确填涂】 1．在Rt ∆ABC 中，∠C =90°，α=∠A ，AC =3，则AB 的长可以表示为（ ▲ ）（A ）αcos 3；（B ） αsin 3；（C ） αsin 3；（D ） αcos 3． 2．如图，在∆ABC 中，点D 、E 分别在边BA 、CA 的延长线上，2=ADAB，那么下列条件中能判断DE ∥BC 的是（ ▲ ）（A ） 21=EC AE ；（B ） 2=ACEC；（C ）21=BC DE ；（D ）2=AEAC． 3．将抛物线3)1(2++-=x y 向右平移2个单位后得到的新抛物线的表达式为（ ▲ ）（A ） 1)1(2++-=x y ；（B ） 3)1(2+--=x y ；（C ） 5)1(2++-=x y ；（D ）3)3(2++-=x y ．4．已知在直角坐标平面内，以点P (-2,3)为圆心，2为半径的圆P 与x 轴的位置关系是（ ▲ ）（A ）相离；（B ）相切；（C ）相交；（D ）相离、相切、相交都有可能． 5．已知e 是单位向量，且e a 2-=，e b 4=，那么下列说法错误．．的是（ ▲ ）（A ）b a //；（B ） 2||=a ；（C ） ||2||a b -=；（D ）b a 21-=． 6．如图，在四边形ABCD 中，对角线AC 与BD 相交于点O ，AC平分∠DAB ，且∠DAC =∠DBC ，那么下列结论不一定正确．．．．．的是（ ▲ ）（A ）AOD ∆∽BOC ∆；（B ）AOB ∆∽DOC ∆；（C ）CD =BC ；（D ）OA AC CD BC ⋅=⋅．二、填空题（本大题共12题, 每题4分, 满分48分）【在答题纸相应题号后的空格内直接填写答案】 7．若线段a 、b 满足21=b a ，则bba +的值为 ▲ ． 8．正六边形的中心角等于 ▲ 度．9．若抛物线2)2(x a y -=的开口向上，则a 的取值范围是 ▲ ． 10．抛物线342+-=x x y 的顶点坐标是 ▲ ．第2题图AB CDE 第6题图O ABCD11．已知∆ABC 与∆DEF 相似，且∆ABC 与∆DEF 的相似比为2:3，若∆DEF 的面积为36，则∆ABC 的面积等于 ▲ ．12．已知线段AB=4，点P 是线段AB 的黄金分割点，且AP<BP ，那么AP 的长为 ▲ ． 13．若某斜面的坡度为3:1，则该坡面的坡角为 ▲ 度．14．已知点A (-2,m )、B (2,n )都在抛物线t x x y -+=22上，则m 与n 的大小关系是m ▲ n ．（填“>”、“<”或“=”） 15．如图，在Rt ∆ABC 中，∠BAC =90°，点G 是重心，联结AG ，过点G 作DG//BC ，DG 交AB 于点D ，若AB=6，BC=9，则∆ADG 的周长等于 ▲ ．16．已知⊙1O 的半径为4，⊙2O 的半径为R ，若⊙1O 与⊙2O 相切，且1021=O O ，则R 的值为 ▲ ．17．如果一个四边形的某个顶点到其他三个顶点的距离相等，我们把这个四边形叫做等距四边形，这个顶点叫做这个四边形的等距点.如图，已知梯形ABCD 是等距四边形，AB//CD ，点B 是等距点. 若BC =10，1010cos =A ，则CD 的长等于 ▲ ．18．如图，在边长为2的菱形ABCD 中，︒=∠60D ，点E 、F 分别在边AB 、BC 上. 将∆BEF 沿着直线EF 翻折，点B 恰好与边AD 的中点G 重合，则BE 的长等于 ▲ ．三、解答题（本大题共7题, 满分78分）【将下列各题的解答过程, 做在答题纸的相应位置上】 19．（本题满分10分）计算：︒--︒︒30cos 60tan 45sin 445cot 02．20．（本题满分10分，第（1）小题5分，第（2）小题5分）如图，在∆ABC 中，点D 在边AB 上，DE //BC ，DF //AC ，DE 、DF 分别交边AC 、BC于点E 、F ，且23=EC AE ．（1）求BCBF的值；（2）联结EF ，设a BC =，b AC =，用含a 、b 的式子表示EF ．第20题图FAD E 第18题图A B CDBCDA 第17题图第15题图D ABG21．（本题满分10分，第（1）小题5分，第（2）小题5分）如图，点C在⊙O上，联结CO并延长交弦AB于点D，»»AC BC=，联结AC、OB，若CD=40，520=AC．（1）求弦AB的长；（2）求ABO∠sin的值．22．（本题满分10分）如图，一栋居民楼AB的高为16米，远处有一栋商务楼CD，小明在居民楼的楼底A处测得商务楼顶D处的仰角为60°，又在商务楼的楼顶D处测得居民楼的楼顶B处的俯角为45°．其中A、C两点分别位于B、D两点的正下方，且A、C两点在同一水平线上，求商务楼CD的高度．(参考数据：414.12≈，732.13≈.结果精确到0.1米)23．（本题满分12分，第（1）小题6分，第（2）小题6分）如图，在∆ABC中，点D在边BC上，联结AD，∠ADB=∠CDE，DE交边AC于点E，DE交BA延长线于点F，且DFDEAD⋅=2．（1）求证：BFD∆∽CAD∆；（2）求证：ADABDEBF⋅=⋅．24．（本题满分12分，每小题4分）在直角坐标平面内，直线221+=xy分别与x轴、y轴交于点A、C. 抛物线cbxxy++-=221经过点A与点C，且与x轴的另一个交点为点B. 点D在该抛物线上，且位于直线AC的上方．（1）求上述抛物线的表达式；（2）联结BC、BD，且BD交AC于点E，如果∆ABE的面积与∆ABC的面积之比为4:5，求∠DBA的余切值；（3）过点D作DF⊥AC，垂足为点F，联结CD. 若∆CFD与∆AOC相似，求点D的坐标．FEDAB C第23题图第21题图DAOB备用图第24题图CDAB第22题图25．（本题满分14分，第（1）小题3分，第（2）小题6分，第（3）小题5分）已知在矩形ABCD 中，AB =2，AD =4. P 是对角线BD 上的一个动点（点P 不与点B 、D 重合），过点P 作PF ⊥BD ，交射线BC 于点F . 联结AP ，画∠FPE =∠BAP ，PE 交BF 于点E . 设PD=x ，EF =y ．（1）当点A 、P 、F 在一条直线上时，求∆ABF 的面积；（2）如图1，当点F 在边BC 上时，求y 关于x 的函数解析式，并写出函数定义域；（3）联结PC ，若∠FPC =∠BPE ，请直接写出PD 的长．长宁区2017-2018学年第一学期初三数学参考答案和评分建议2018.1一、选择题：（本大题共6题，每题4分，满分24分） 1．A ； 2．D ； 3．B ； 4．A ； 5．C ； 6．D ．二．填空题：（本大题共12题，满分48分）7．23； 8．060； 9．a >2；10．)1,2(-； 11．16； 12．526-； 13．030； 14．<； 15．10；16．6或14； 17．16； 18．57．三、（本大题共7题，第19、20、21、22题每题10分，第23、24题每题12分，第25题14分，满分78分）19. （本题满分10分）解：原式=233)22(412--⨯ (4分) =23321-- (2分) =2332-+ (2分) =232+(2分) 20．（本题满分10分，第（1）小题5分，第（2）小题5分）备用图备用图图1DCBA DCBA F EP D CB A 第25题图解：（1）∵23=EC AE ∴52=AC EC （1分） ∵DE//BC ∴52==AC EC AB BD （2分）又∵DF//A ∴52==AB BD BC BF （2分）（2）∵52=BC BF ∴53=BC FC ∵a BC =，CF 与BC 方向相反 ∴a CF 53-= （2分）同理：b EC 52=（2分）又∵→+=CF ∴→-=a 5352 （1分）21．（本题满分10分，第（1）小题5分，第（2）小题5分）解：（1）∵CD 过圆心O, »»AC BC = ∴C D ⊥AB ,AB=2AD=2BD （2分）∵CD =40，520=AC 又∵∠ADC=090∴2022=-=CD AC AD （2分）∴AB=2AD=40 （1分）（2）设圆O 的半径为r ,则OD =40-r （1分） ∵BD =AD =20, ∠ODB=090 ∴222OB OD BD =+∴222)40(20r r =-+ （1分） ∴r =25,OD =15 （2分） ∴532515sin ===∠OB OD ABO （1分） 22．（本题满分10分）解：过点B 作BE ⊥CD 与点E ，由题意可知∠DBE=045，∠DAC=060，CE=AB=16 （2分）设AC=x ,则x CD 3=，BE=AC=x （1分） ∵163-=-=x CE CD DE （1分）∵045,90=∠=∠DBE BED ∴BE=DE ∴163-=x x （2分）∴1316-=x （1分） ∴)13(8+=x （1分） ∴9.3738243≈+==x CD （1分）答：商务楼CD 的高度为37.9米。

上海市长宁区2018届九年级物理上学期期末质量检测试题新人教版

上海市长宁区2018届九年级物理上学期期末质量检测试题（考试时间90分钟，满分100分）考生注意：1．本试卷含五个大题。

2．答题时，考生务必按答题要求在答题纸规定的位置上作答，在草稿纸、本试卷上答题一律无效。

一、选择题（共20分）下列各题均只有一个正确选项，请将正确选项的代号用2B 铅笔填涂在答题纸的相应位置上，更改答案时，用橡皮擦去，重新填涂。

1．我国家庭电路的电压是A ．220VB ．110VC ．24VD ．1.5V2．铁轨铺设在枕木上是为了A ．减小压力B ．增大压力C ．减小压强D ．增大压强3．空气的密度约为1.29千克/米3，一般卧室中空气的质量最接近以下哪个物体的质量A ．一张纸B ．一本书C ．一只鸡D ．一个成人4．首次测定了大气压数值的科学家是A ．帕斯卡B ．托里拆利C ．牛顿D ．阿基米德5．以下各实例中，利用连通器原理工作的是A ．茶壶B ．吸尘器C ．密度计D ．抽水机6．如图1所示，闭合电键S 时，用电表能正确测量电阻R 1两端电压或通过电流的电路图是A ．B ．C ．D ．7．额定功率为1000瓦的用电器可能是A ．白炽灯B ．电视机C．电冰箱D ．电烤箱8．同一艘轮船从长江航行驶入东海的过程中，若排开江水和海水的体积分别为V 江、V 海，排开江水和海水的质量分别为m 江、m 海（ρ江＜ρ海），则A ．V 江＝V 海，m 江＜m 海；B ．V 江＞V 海，m 江＜m 海；C ．V江＞V 海，m 江＝m 海；D ．V 江＜V 海，m 江＜m 海。

9．如图2所示的电路，电源电压保持不变，电路中各元件连接正确且均完好，闭合电键S ，向右移动滑动变阻器滑片P 的过程中图1A ．电流表A 的示数变大B ．电压表V 的示数变大C ．电压表V 与电流表A 的示数的比值变大D ．电压表V 与电流表A 的示数的乘积变小10．如图3所示，底面积不同的甲、乙两个实心圆柱体，它们对水平地面的压力F 甲＞F 乙。

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