2014年北京市门头沟区初三第二次统一练习
英语_2014年北京市门头沟区中考英语二模试卷_复习
2014年北京市门头沟区中考英语二模试卷一、听对话,从下面各题所给的A、B、C三幅图片中选择与对话内容相符的图片.每段对话你将听两遍.(共4分,每小题1分)1.2.3.4.二、听对话或独白,根据对话或独白的内容,从下面各题所给的A、B、C三个选项中选择最佳选项.每段对话或独白你将听两遍.(共12分,每小题2分)5. 请听一段对话,完成第5至第6小题.5.Who are the man's parents staying with?A His sister.B His brother.C His friends.6.Why doesn't the man's father like the city?A.He likes to live alone.B.He likes the country life.C.He hates the noises.6. 请听一段对话,完成第7至第8小题.7.Where are the speakers?A In a bookstore.B In a park.C In a cake shop.8.What does the woman want to do?A.To buy a birthday cake.B.To borrow some books.C.To get some money.7. 请听一段对话,完成第9至第10小题.9.How often is the party held?A Once a week.B Twice a week.C Three times a week.10.What is the matter with the woman?A.She can't enjoy the party.B.She can't go to work.C.She can't fall asleep.8. 请听一段对话,完成第11至第13小题.11.What will the man do with his cold?A.Go to see a doctor.B.Have chicken soup.C.Have some milk.12.Why won't he take any medicine?A.It'll make him sleepy.B.He doesn't like medicine at all.C.He has had enough breakfast.13.What will he do?A.Stay at home.B.Go to buy some coffee.C.Give a talk.请听一段对话,完成第11至第13小题.11.What will the man do with his cold?A.Go to see a doctor.B.Have chicken soup.C.Have some milk.12.Why won't he take any medicine?A.It'll make him sleepy.B.He doesn't like medicine at all.C.He has had enough breakfast.13.What will he do?A.Stay at home.B.Go to buy some coffee.C.Give a talk.9. 请听一段独白,完成第14至第16小题.14.Where was the first International Friendship Camp held?A In China.B In Italy.C In the USA.15.How long did the International Friendship Camp last in Beijing?A.Ten days.B.Two weeks.C.A month.16.How would Shirley describe some members of her host family?A.Patient.B.Clever.C.Kind.三、听对话,记录关键信息,对话你将听两遍.(共10分,每小题10分)请根据所听到的对话内容和卡片上的提示词语,将所缺的关键信息填写在下面卡片中的相应位置上.四、单项填空(共13分,每小题1分)从下面各题所给的A、B、C、D四个选项中,选择可以填入空白处的最佳选项.11. The girl is at school.__________ is busy with her work.()A HeB HimC SheD Her12. -Hi,Mike,I've got a present __________ you.-Oh,it's really beautiful.Thank you very much.()A inB onC ofD for13. Be quick,__________ you'll be late for school.()A orB soC andD but14. ﹣﹣﹣____________do you go to the cinema?﹣﹣﹣Once a month.()A How longB How farC How oftenD How much15. This box is __________ than that one.()A heavyB heavierC heaviestD the heaviest16. -__________ she sing English songs?-Yes,she can.()A CanB MustC NeedD Should17. ______ of his parents are doctors.A EachB BothC AllD Some18. -Lucy,let me __________ a look at your new watch.-Ok,dad.()A hasB haveC to haveD having19. Mary __________ to school on foot every morning.()A goB goesC wentD will go20. There ______ a football match between China and England tomorrow.A isB wasC will beD has been21. Mike __________ TV when his mother came back home yesterday.()A watchedB is watchingC was watchingD has watched22. English __________ all over the world.()A speaksB is speakingC is spokenD has spoken23. -Can you tell us __________ just now?-Sorry,I don't know.()A what Miss Wang saysB what Miss Wang saidC what does Miss Wang sayD wh at did Miss Wang say五、完形填空(共12分,每小题12分)通读下面短文,掌握其大意,然后从短文后各题所给的四个选项中选择能填入相应空白处最佳的一项.24. Dad lost his job after arguing(争吵) with the boss, and when Christmas came that year, we had no money at all.On Christm as Eve, Dad took me out into the park.I had a blanket(毛毯) wrapped(卷绕) around me, so I offered to share (1)________ with Dad, but he said no thanks.We looked(2)________ at the sky.Those shining stars were one of the (3)________ treats for people like us who lived out in the wildness(荒凉).Rich city people, he'd say, live in fantastic flats, but their air was so polluted(污染的) that they could not even see the stars."(4)________ out your favorite star."Dad said that night.He told me I could have it for keeping.He said it was my Christmas present."You can't give me a star, "I said, "Nobody (5)________ the stars.""Right, "Dad said, "But you can suppose it is yours.And when you do that, it is yours."I (6)________ my head, looked at the stars, and tried to figure out(断定) which was the best one.Then, I found one."I (7)________ that one."I said.Dad smiled."That's Venus(金星), "he said, "Venus was only a planet.She looked bigger and brighter because she was m uch (8)________ than the stars.Poor old Venus didn't even make her own light.She shone only from reflected(反射)(9)________.""I like it anyway, "I said, "I had loved Venus even (10)________ that Christmas.You could see it in the early evening, and if you got up early, you coul d still see it in the morning, after all the stars had disappeared."Dad said, "Ok, it's Christmas.I (11)________your decision.You can have it if you want."And he gave me Venus.We all laughed about the kids who believed in the Santa myth(圣诞传说) and got nothing for Christmas but a bunch(堆) of cheap plastic toys."Many years later, when all the junk(废物) they got is broken and long forgotten, "Dad said, "you will(12)________ have your star."(1)A itB meC usD him(2)A upB forC outD after(3)A strangeB specialC importantD impossible(4)A B Put C Take D Pick(5)A ownsB seesC likesD reaches(6)A lowedB putC raisedD rose(7)A needB wantC haveD hope(8)A slowerB fartherC closerD higher(9)A sunB starC plantD light(10)A whenB beforeC afterD until(11)A dislikeB refuseC acceptD consider(12)A evenB stillC neverD already六、阅读下列短文,根据短文内容,从短文后各题所给的A、B、C、D四个选项中,选择最佳选项.(共26分,每小题6分)25.(1)If you want to enjoy country music,you should call________.A 8115608.B 3102768.C 2711399.D 6935094.(2)Where can you learn Spanish dancing?________A In the cinema.B At John Black's.C At Wanda Plaza.D At Rainbow Music Club.(3)You can watch Titanic (3D) at________.A 7:50a.B 9:00p.C 9:50p.D 7:50a.26. Being safe in your everyday life need knowledge.If you remember the following infor mation, your life will be much safer.•Always notice the environment around you.You shouldn't walk alone outside.Make sur e where the public phones are.If anything dangerous happens, you can find them easily.•Your bag should be carried towards the front of your body instead of putting it on your ba ck.When a bus is full of people, it is easy enough for a thief to take away the things in the ba g on your back.•If you are followed by someone you don't know, cross the street and go to the other way, l et the person understand that you know he or she is after you.Next, don't go home at once .You are safer in the street than you are alone in your home or in a lift (电梯).•If you have to take a bus to a place far away, try to get to the stop a few minutes earlier bef ore the bus leaves.This stops other people from studying you.On the bus, don't sit alone .Sit behind the driver or with other people.Don't sleep.(1)Which of the following is NOT safe when you are out?________A Go home alone late at night.B Make sure where the public phones are.C Don't get to the bus stop too early.D Always notice the environment around you.(2)When you are followed by someone on your way home,you should________ to make yourself safe.A run home .B turn back and walk towards him or her.C find a lift and go in .D cross the street and go to the other way.(3)What can you learn from the text?________A How to cross the street.B How to be safe in your everyday life.C How to use the public phones. D How to notice the environmet around you.27. I've loved my mother's desk since I was just tall enough to sit above the top of it.Moth er sat writing letters.Standing by her chair, looking at the ink bottle, pens, and white paper, I decided that the act of writing must be a most wonderful thing in the world.Years later, during her final illness, Mother kept different things for my sister and brother ."But the desk, "she said again, "is for Elizabeth."I never saw her angry, never saw her cry.I knew she loved me; she showed in action.Bu t as a young girl, I wanted to have heart-to-heart talks between mother and daughter.They never happened.And a gulf opened betwe en us.I was"too emotional(易动感情的)".But she lived"on the surface(表面)".As years passed and I had my own family.I loved my mother and thanked her for our hap py family.I wrote to her in careful words and asked her to let me know in any way she chos e that she did forgive me.My hope turned to disappointment, then little interest and, finally, peace-it seemed that nothing happened.I couldn't be sure that the letter had even got to Mother.I only knew that I had written it, and I could stop trying to make her into someone she was n ot.But the present of her desk told me, as she'd never been able to, that she was pleased that writing was my chosen work.I cleaned the desk carefully and found some papers inside-a photo of my father and a one-page letter, folded(折叠) and refolded many times.It was my letter."In any way you choose, Mother, you always chose the act that speaks louder than words."(1)The passage shows that________.A Mother was cold on the surface but kind in her heart to her daughter.B Mother was too serious about her daughter in words.C Mother wrote to her daughter in careful wo rds.D Mother wrote to her daughter in careless words.(2)The word"gulf"in the passage means________.A deep understanding between the old and the young.B different ideas between moth er and daughter.C free talks between mother and daughter.D part of the sea goi ng far in land.(3)What's best title of the passage?________A My Letter to Mother.B Mother and Children.C My Mother's Desk.D Talks be tween Mother and me.28. BEING an astronaut sounds cool, doesn't it? In space, they get to do some pretty amazing things, like floating(漂浮) in zero gravity(重力).However, there are also plenty of things that astronauts can't do because of their weightles s environment, and that's very sad.What's worse, they can't even let their sadness show, be cause it's impossible to cry in zero gravity.Of course, astronauts can still produce tears(眼泪).But crying is much more difficult in space, according to The Atlantic(大西洋月刊) in January.Without gravity, tears don't flow(流动) down out of the eyes like they do here on Earth.This means that when you cry in spac e, your tears have nowhere to go-they just stick(粘) to your eyes.In May 2011, astronaut Andrew Feustel experienced this during one of his spacewalks."T ears, "he said, "don't fall off of your eyes.They just stay there."Besides making your vision(视线) unclear, this can also cause physical pain.Back on Earth, tears are supposed to bring c omfort to the eyes.But that's not the case(情况) in space.The space environment dries out astronauts'eyes, and when tears suddenly wet the eyes, it can cause pain rather than comfort."My right eye is stinging(刺痛) like crazy, "Feustel told his teammate during the walk.Since gravity doesn't work in space, astronauts need some extra help to get rid of(除去) the tears.Feustel chose to rub his eyes against his helmet to wipe(擦) the tears away.Another choice is to just wait-"When the tears get big enough, they simply break free of the eyes and float around, "astrona ut Ron Parise told The Atlantic.There are lots of small things-things ike crying-that we are so used to on Earth.We usuallytake them for granted until they become a probl em in a totally different environment, like space.There, astronauts can't talk to each other d irectly.They also can't eat or drink in normal ways.They can't even burp打嗝), because there is no gravity to hold the food down in their stomach.If they do burp, th ey just end up throwing up(呕吐) everything in their stomach, according to the UK National Space Center.Therefore, perhaps it's only space explorers who can honestly say, "Gravity, you're the best ."(1)From Paragraphs 2and 3,we can know that________.A astronauts are unable to feel sad in space.B astronauts produce fewer tears in space .C tears produced in space flow down more slowly.D tears produced in space do n't flow downward.(2)What effect do tears hve on astronauts?________A They cause physical pain.B They bring comfort to them.C They make their vis on clearer.D They float around and cause trouble.(3)The underlined phrase"take them for granted"in paragraph 7means________.A find them important.B consider them useless.C need them during an emerge ncy.D fail to notice their presence.(4)Paragraph 7is mainly about________.A suggestions of how astronauts can stay comfortable in space.B other basic things th at are difficult to do in space.C why burping is impossible in space.D things hum an can't do without gravity.七、阅读短文,根据短文内容,从短文后的五个选项中选出能填入空白处的最佳选项.选项中有一项为多余选项.(共8分,每小题8分)29. Reading for pleasure is the easiest way to become a better reader in English.(60)________Some students say they don't want to read for pleasure.They say they want to use their time to learn the rules of the language and new words.They say that pleasure reading is too easy.Many experts say pleasure reading is very important f or learning Engish.Dr.Stephn Krashen,a famous expert on learning languages,says that pleasure reading helps you learn many important things about English.Students l earn more grammar and more words when they read for pleasure.(61)________ Dr.Krashen tells us that pleasure reading helps each student in a different way.Ea ch student needs to learn something different.Pleasure reading makes it possible for each s tudent to learn what he or she needs.(62)________When you read for pleasure,you choose your own books,and you don't have to remember everything.There are no tests on your pleasure reading bo oks.Pleasure reading will help you:●learn how English speakers use Englishread faster in English●find examples of good writing in English●(63)________●learn about the cultures of English speakersA.learn new wordsB.take an English testC.They also learn more about good writing.D.It is also the most important way.E.Reading for pleasure is not the same as studying.八、阅读短文,根据短文内容回答问题.(共10分,每小题10分)30. Now you've finished three years of English study.There's one way to demonstrate(展示) what you've learned-take a test!Do you have any special methods you use to help you do better on a test?How well you do is often a matter of how well prepared you are.Here are some ways to ma ke sure you're at your best on test days.Go to bed early.The night before a test is not the time to stay up watching TV.You want to be rested and wide-awake for test day.Have a good breakfast.Test day isn't a morning for donuts.Nor is it a time to starve(挨饿) yourself.Eat plenty of low-sugar,high-energy food to keep your brain and body working their best.Be prepared.Make sure you have two pencils and anything else you were asked to bring.Watch the numbers.Make sure that the number of the items(项目) on your answer sheet matches the number of the question.Look over all the answer choices.Don't assume(假定) that choice A is correct until you've checked the others.You may find a better one.An d it is wrong to eliminate(排除) any choice that you can see at once.You'll have a better chance of finding the right ans wer.Check the clock.Make sure you allow yourself enough time to answer every question and g o back and check your answers.Don't spend too much time on any dificult question.Skip i t and come back to it later.Keep up with your schoolwork all year long.That's how you get the skills you need for taking test.64.Is taking a test a way to demonstrate what you've learned?________65.How many ways are mentioned in this passage?________66.What should you take to prepare for a test?________67.What do you do if you meet any difficult question?________68.What's the passage mainly about?________.九、完成句子(共10分,每小题2分)根据中文意思完成句子.31. 你最好现在就告诉露西这件事情.You________ tell Lucy about it now.32. 你们想要吃些香蕉吗?________ have some bananas?33. 明天他们会尽早到学校的.They will get to school________ tomorrow.34. 昨天下午五点时,我们正在忙着大扫除呢.We________ at five yesterday afternoon.35. 直到上周五汤姆才收到他妈妈的来信.Tom________ last Friday.十、文段表达(共15分)36. 根据中文和英文提示,写一封意思连贯、符合逻辑、不少于50词的回信.信的开头和结尾已给出,其词数不计入所要完成的回信内.请不要写出你的校名和姓名.假如你叫李亮,最近和英国朋友May通过电子邮件谈论帮助他人.请你根据她的问题回复邮件.2014年北京市门头沟区中考英语二模试卷答案1. C2. A3. B4. C5. AC6. CA7. AC8. 略9. CBC10. bird,Sunday,8:30,bus,twenty/2011. C12. D13. A14. C15. B16. A17. B18. B19. B20. C21. C22. C23. B24. AABDACBCDBCB25. ABC26. ADB27. ABC28. DADB29. D,C,E,A30. Yes./Yes,it is,Six./6,I should have two pencils and anything else I was asked to bring,Skip it and come back to it later,Ways of making sure of doing best on test days31. had better32. Would you like to33. as early as possible.34. were busy doing some cleaning35. didn't hear from his mother until36. Hi,Mary!I'm glad to hear from you.I think it is important for us to help others.【高分句型一】And I like it very much.(表明自己的观点)I remember I helped the old people in the old people's home last Saturday.I cleaned the room and the windows for them.I told them some interesting stories.I sang some English son gs and they really enjoyed it.(我帮助别人的事情)I think I will do the same in the future because it can bring me and other people happiness.【高分句型二】(我将来会做的)Yours,Li Liang。
2014年 13区中考物理二模试卷填空24小题汇总
2014年北京市门头沟区初三第二次统一练习24.一根均匀的木棍长度为L ,密度为ρ1。
下端挂一个质量为m 的小金属块后,能如图9所示漂浮在密度为ρ2的液体中。
此时木棍露出液面的长度为h 。
用剪刀剪掉长度为L '= 的木棍,剩余的木棍和金属块恰能悬浮在原来的液体中。
北京市怀柔区2014年高级中等学校招生模拟考试(二)24.将高为20cm 的圆柱体甲放在水平地面上,细绳的一端系于圆柱体甲上表面的中央,另一端竖直拉着杠杆的A 端。
当把质量为800g 的圆柱体乙悬挂在杠杆的B 端并处于圆柱形容器M 中时,杠杆在水平位置平衡,如图7所示,此时圆柱体甲对水平地面的压强为3200Pa 。
把质量为900g 的水注入容器M 中,水未溢出,水静止后,水对容器M 底面的压强为2500Pa ,圆柱体甲对水平地面的压强为5000Pa 。
已知:AO :OB =2:3,容器M 的底面积为60cm 2,不计杠杆的质量,g 取10N/kg ,则圆柱体甲的密度为 kg/m 3。
图7图92014年房山区中考物理二模试卷24.图6是利用滑轮组匀速提升水中圆柱体M 的示意图,滑轮组固定在钢架上,已知动滑轮的质量是30kg ,绕在滑轮组上的绳子能承受的最大拉力为500N ,连接圆柱体M 与动滑轮挂钩的绳子能承受的最大拉力为1500N 。
圆柱体M 高为3m ,底面积为20.03m ,密度为331.510kg/m ⨯。
在绳端拉力F 作用下,圆柱体M 从水下被缓慢地拉出水面的过程中(不计绳重、轮与轴的摩擦及水的阻力,g 取10N/kg )滑轮组的机械效率η的变化范围是____________。
北京市西城区2014年初三二模试卷24.一个阻值为1R 的定值电阻与一个滑动变阻器串联接在电压恒为U 的电源两端。
当滑动变阻器的滑片P 从一点滑到另一点时,电路消耗的总功率的变化量为p ∆,则滑动变阻器两端的电压变化量||U ∆ = 。
京市密云县2014年第二次统一练习24.一个木块在水中漂浮,露出水面的体积为200cm 3,现将与木块体积相等的金属块压在木块上后,二者恰好在水中悬浮,已知金属块的质量为600g ,则金属块的密度是 kg/m 3。
2014北京各区二模语文答案(二)
2014北京各区二模语文试卷答案(二)北京市西城区2014年初三二模语文试卷参考答案及评分标准2014.6一、(共24分)(一)(共14分。
每小题2分)1.B 2.C 3.A 4.C 5.C 6.B 7.D(二)(共10分)8.(1)蒙络摇缀(1分。
有错不得分)(2)浮光跃金静影沉璧(2分。
每空1分,有错该空不得分)(3)征蓬出汉塞归雁入胡天几处早莺争暖树谁家新燕啄春泥(4分。
每空1分,有错该空不得分)9.①一鼓作气(彼竭我盈,再衰三竭)②左传③曹刿(3分。
每空1分)二、(共10分)10.(1)的(2)围,绕(2分。
每空1分)11.(1)威慑天下不能靠武力的强大。
(2分。
关键词“威”“以”“兵革”“利”错一处扣1分)(2)帮助他的人少到了极点,兄弟骨肉(内外亲属)也会背叛他。
(2分。
每句1分,关键词“寡”“至”“亲戚”“畔”错一处扣1分)12.①城郭小(势力弱)②攻势强大(占优势、得天时)③委而去之④得道(4分。
前两空意思对即可。
)三、(共36分)(一)(共16分)13.(1)和我们玩藏猫捉贼(3)关心流浪儿童(4)和小和尚友好相处(6)给我们“演戏”(4分。
每空1分)14.本文的“父亲”是一个非常爱孩子、富有童心、热心帮助孩子的人,这两副挽联反映的正是“父亲”的这些特点,和作者对“父亲”的认识是一致的,引发了作者的共鸣,所以触动了作者的心灵。
(5分。
“父亲”形象特点2分,结合挽联和作者认识2分,语言1分)15.答案示例一:第②段作者描述了父亲喜欢孩子的特点。
“一会儿,父亲来了,故意转上两圈,然后冷不防地把我们其中的一个捉出来,‘小俘虏’被举得高高的,其余的孩子也都跑出来,围着父亲又喊又叫又哈哈大笑。
”作者用“故意”“冷不防”“捉住”等词语,生动地写出父亲和孩子们游戏的情景,表现了父亲对孩子的喜爱和充满童心的性格特点。
用孩子们“围着父亲又喊又叫又哈哈大笑”的描写,表现了父亲给孩子们带来的无限快乐。
北京市门头沟区年中考物理二模试卷(含解析)
北京市门头沟区2014年中考物理二模试卷小题2分)1.通常情况下,下列物品中属于绝缘体的是A.永定河里的河水B.干电池里的碳棒C.钢丝钳把手上的塑料套D.导线中的铜丝考点:绝缘体..专题:电流和电路.分析:容易导电的物体叫导体,不容易导电的物体叫绝缘体,导电性能介于导体与绝缘体之间的叫半导体.解答:解:河水、碳棒、铜丝能够导电,属于导体;塑料不能够导电,属于绝缘体.故选C.点评:本题考查了导体和绝缘体的概念,属于识记性的东西,只要记住即可解答2.在颐和园的昆明湖上,小红同学坐在航行的游艇内,若说她是静止的,则所选择的参照物是A.湖岸B.游艇C.湖水D.岸边的树考点:参照物及其选择..分析:小红坐在航行的游艇内,所以小红相对地面是运动的,若说她是静止的,那么一定是选择相对地面运动且速度等于游艇的物体为参照物,可根据四个选项进行选择.解答:解:A、湖岸相对地面是静止的,不符合题意;B、游艇是相对地面运动的,符合题意;C、湖水的速度不等于游艇,不符合题意;D、岸边的树相对地面是静止的,不符合题意;故选B.点评:这类题目是考查相对静止的问题,它们相对地面都是运动的,但如果以运动的物体为参照物,也可能是相对静止的.3.图1所示的现象中,属于光的反射现象的是考点:光的反射;光直线传播的应用;光的折射现象及其应用..专题:图析法.分析:要解决此题,需要掌握光的反射现象,知道平面镜成像是由于光的反射形成的.要掌握光的折射现象,知道水底看起来比实际的要浅、斜插入水中的筷子向上折、海市蜃楼、凸透镜成像都是光的折射.要掌握光沿直线传播现象,知道影子的形成、日月食的形成、小孔成像都是光沿直线传播形成的.解答:解:A、水中的倒影,属于平面镜成像,是由光的反射形成的.故本选项符合题意;B、日月食都是由于太阳、地球、月亮在同一直线上,若月亮在中间挡住太阳光便为日食;若地球在中间挡住太阳光,则为月食.日月食是由于光沿直线传播形成的.故本选项不符合题意;C、小孔成像属于光沿直线传播原理,故本选项不符合题意;D、铅笔“折断”如同插入水中的筷子在水面处“弯折”一样,是因为光从水中斜射入空气中时,发生折射,故本选项不符合题意.故选A.点评:光的直线传播形成的现象包括:小孔成像,影子的形成,日、月食的形成等;光遇到物体表面会发生反射:平面镜成像就是光的反射形成的;光从一种介质斜射入另一种介质时,光的传播方向会发生偏折:钢笔错位、筷子变折、海市蜃楼,凸透镜成像等都属于光的折射现象.4.图2所示的四种工具中,属于省力杠杆的是考点:杠杆的分类..专题:应用题.分析:结合图片和生活经验,判断四种工具在使用过程中,动力臂和阻力臂的大小关系,再判断它是属于哪种类型的杠杆.解答:解:如图,在使用镊子、钓鱼竿时,动力臂小于阻力臂,是费力杠杆,但能省距离;天平是典型的等臂杠杆,动力臂等于阻力臂;在使用撬棒时,动力臂大于阻力臂,是省力杠杆,但费距离;故选C.点评:此题考查的是杠杆的分类和特点,主要包括以下几种:①省力杠杆,动力臂大于阻力臂,省力但费距离;②费力杠杆,动力臂小于阻力臂,费力但省距离;③等臂杠杆,动力臂等于阻力臂,既不省距离也不省力.5.下列关于温度、热量和内能变化的说法中,正确的是A.物体温度升高,它的内能一定增加B.物体温度升高,一定是外界对物体做功C.物体温度不变,它的内能一定不变D.物体温度降低,一定是物体放出了热量考点:温度、热量与内能的关系..专题:热和能.分析:做功和热传递都能改变物体的内能,物体温度升高,内能一定增加;内能与物体的温度、质量以及状态有关.解答:解:A、物体温度升高,分子运动更加剧烈,因此内能增大,故A正确;B、物体温度升高,可能吸收了热量,也可能是对它做了功,故B错误;C、晶体的熔化过程,尽管温度不变,但是它继续吸收热量,但是内能是增大的,故C错误;D、物体温度降低,内能减小,可能放出了热量,也可能对外做了功,故D错误.故选A.点评:本题主要是考查学生对内能、温度与热量三者之间的联系和区别的掌握,以及改变物体内能的两种方法是等效的.6.下列现象中,不能..说明分子处在永不停息的无规则运动中的是A.花开时香气扑鼻B.扫地时尘土飞扬C.红墨水在水中散开D.衣柜里的樟脑丸过一段时间变小了考点:分子的运动..专题:分子热运动、内能.分析:物质是由分子组成的,分子永不停息地做无规则的运动,扩散现象与布朗运动证明了分子的无规则运动.解答:解:A、花开时香味扑鼻是扩散现象,证明了分子不停地做无规则运动,不符合题意,故A 错误;B、扫地时尘土飞扬,是固体小颗粒的运动,不是分子的运动,不能说明分子永不停息地做无规则运动,符合题意,故B正确;C、红墨水在水中散开是扩散现象,能证明分子不停地做无规则运动,不符合题意,故C错误;D、衣柜里的樟脑丸过一段时间变小了,是扩散现象的结果,能证明分子永不停息地做无规则的运动,不符合题意,故D错误;故选B.点评:本题考查了分子动理论的应用,掌握分子动理论即可正确解题,本题难度不大是一道基础题.7.图3所示的四个实例中,目的是为了减小压强的是考点:减小压强的方法及其应用..专题:压强、液体的压强.分析:压强大小跟压力大小和受力面积大小有关.增大压强的方法:在压力一定时,减小受力面积来增大压强;在受力面积一定时,增大压力来增大压强.减小压强的方法:在压力一定时,增大受力面积来减小压强;在受力面积一定时,减小压力来减小压强.解答:解:(1)注射器针头做得很尖、用刀切苹果、用很细的钢丝切肥皂,都是在压力一定时,减小受力面积来增大压强,不符合题意.(2)载重汽车装有很多轮子,是在压力一定时,增大受力面积来减小压强.符合题意.故选B.点评:掌握压强大小的影响因素,利用控制变量法,解释生活中增大和减小压强的有关问题.8.图4所示的四个情景中,其物态变化过程需要吸热的是考点:汽化及汽化吸热的特点..专题:汽化和液化、升华和凝华.分析:熔化、汽化、升华需要吸热,凝固、液化、凝华需要放热,弄清楚四幅图中的物态变化再去判断吸放热情况.解答:解:A、冬天户外的人呼出“白气”,是嘴中呼出的水蒸气遇冷液化形成的小水珠,是液化现象,需要放热,故A不符合题意;B、湿裤子晾干,是水变成水蒸气的过程,是汽化现象,需要吸热,故B符合题意;C、冬天窗玻璃上有冰花,是水蒸气遇冷凝华形成的小冰晶,是凝华现象,需要放热,故C 不符合题意;D、钢水浇铸得到钢件,是钢水变成固态钢件的过程,是凝固现象,需要放热,故D不符合题意.故选B.点评:此题主要考查的是学生对物态变化概念及其吸放热情况的理解和掌握,弄明白四幅图中的物态变化名称是解决此题的关键.9.如图5所示的四种情景中,人对物体做功的是考点:力是否做功的判断..专题:应用题.分析:做功必须具备两个必要因素:①作用在物体上的力,②物体在力的方向上通过距离.判定有没有做功,就从是否具备这两个必要因素入手.解答:解:A、举着杠铃不动,人给杠铃一个向上的力,杠铃向上没有移动距离,人对杠铃没有做功.不符合题意.B、大力士支撑着大轮胎静止不动,人对轮胎施加了力,但没有移动距离,人对轮胎没有做功.不符合题意.C、用力搬起箱子,人给箱子一个向上的力,箱子向上移动了距离,人对箱子做功.符合题意.D、背着书包,人给书包一个竖直力,而书包没有在力的方向上通过的距离,所以没有做功.不符合题意.故选C.点评:有力有距离,力对物体不一定做功,物体必须在力的作用下通过了距离,力对物体才做功.10.下列说法中正确的是A.接入同一电路中的两个导体电阻大小不相等,则通过它们的电流也不相等B.带有异种电荷的两个小球互相靠近,会互相排斥C.电动自行车在给蓄电池充电时,是将化学能转化为电能D.原子弹和氢弹爆炸时,释放的都是核能考点:电路的基本连接方式;能量的相互转化;电荷间的相互作用规律;核能..专题:其他综合题.分析:(1)串联电路中处处电流相等;(2)电荷间的相互作用规律:同种电荷相互排斥,异种电荷相互吸引;(3)蓄电池充电时,将电能转化为了化学能;(4)原子弹是核裂变工作的,氢弹是利用核聚变制成的.解答:解:A、如果不相等的两个电阻串联,则通过两个电阻的电流相等,故A错误;B、带有异种电荷的两个小球互相靠近,会互相吸引,故B错误;C、蓄电池充电时,将电能转化为了化学能;故C错误;D、原子弹是核裂变工作的,氢弹是利用核聚变制成的,因此原子弹和氢弹爆炸时,释放的都是核能,故D正确.故选D.点评:本题考查电路的基本连接方式、能力转化问题、电荷间的相互作用规律以及原子弹和氢弹的原理,涉及的知识点较多,但都是必须正确的基础内容.11. 下列选项是对质量和长度的估测,其中最接近实际的是A.一个鸡蛋的质量约为500gB.一位中学生身高约为1.6mC.一块橡皮的质量约为10kgD.一支未用过的2B铅笔的长度约为15mm考点:质量的估测;长度的估测..专题:估算题.分析:估测法是利用物理概念、规律、物理常数和常识对物理量的数值、数量级进行快速计算以及对取值范围合理估测的方法,这就要求同学们要学会从生活体验中理解物理知识和物理规律,并且能将物理知识和物理规律用于对生活现象和生活常识的简单解释.解答:解:A、此选项不符合实际,一个鸡蛋的质量约为50g;B、此选项符合实际,一位中学生的身高约为1.6m;C、此选项不符合实际,一块橡皮的质量约为10g;D、此选项不符合实际,一直未用过的2B铅笔的长度约为15cm;故选B.点评:考查估测能力,需要在平时的学习与生活中多积累,将物理知识与社会生活联系起来.12.图6甲所示为一台电压力锅,它结合了高压锅和电饭锅的优点,省时省电、安全性高。
2014年北京市各城区中考二模数学——统计图表题20题汇总
2014年北京市各城区中考二模数学——统计图表题20题汇总 1、(2014年门头沟二模)21. 在结束了380课时初中阶段数学内容的教学后,唐老师计划安排60课时用于总复习,根据数学内容所占课时比例,绘制如下三个统计图表(如图1,图2,图3),请根据图表提供的信息,回答下列问题:(1)图1中“统计与概率”所在扇形的圆心角为 度; (2)图2、3中的a = ,b = ;(3)在60课时的总复习中,唐老师应安排多少课时复习“数与代数”内容?2、(2014年丰台二模)21.某市在2013年义务教育质量监测过程中,为了解学生的家庭教育情况,就八年级学生平时主要和谁在一起生活进行了抽样调查.下面是根据这次调查情况制作的不完整的频数分布表和扇形统计图.频数分布表 扇形统计图请根据上述信息,回答下列问题:(1)a =________,b =________,c =_______;(2)在扇形统计图中,和父母一起生活的学生所对应扇形圆心角的度数是______; (3)如果该市八年级学生共有30000人,估计不与父母一起生活的学生有_______ 人. 3、(2014年平谷二模)21.某校为了开设武术、舞蹈、剪纸等三项活动课程以提升学生的体艺素养,随机抽取了部分学生对这三项活动的兴趣情况进行了调查(每人从中只能选一项),并将调查结果绘制成下面两幅统计图,请你结合图中信息解答问题. (1)将条形统计图补充完整;(2)本次抽样调查的样本容量是____________;36°DC BA(3)已知该校有1200名学生,请你根据样本估计全校学生中喜欢剪纸的人数.4、(2014年顺义二模) 20.保障房建设是民心工程,某市从2009年加快保障房建设工程.现统计了该市从2009年到2013年这5年新建保障房情况,绘制成如图1、2所示的折线统计图和不完整的条形统计图.某市2009-2013年新建保障房套数年增长率折线统计图 某市2009-2013年新建保障房套数条形统计图10121523.42422图2套数(万套)年份2012201120102009201612201310141825155201301020302009201020112012年份年增长率(%)图1(1)小颖看了统计图后说:“该市2012年新建保障房的套数比2011年少了.”你认为小颖的说法正确吗?请说明理由;(2)求2012年新建保障房的套数,并补全条形统计图; (3)求这5年平均每年新建保障房的套数.5、(2014年石景山二模)20.以下是根据北京市国民经济和社会发展统计公报中的相关数据,绘制的北京请你根据以上信息解答下列问题:(1)根据北京市2009--2013年生产总值年增长率,请计算出2011年北京市年生产总值是_________(结果精确到1百亿元),并补全条形统计图;(2)若从2013年以后,北京市年生产总值都按15%的年增长率增长,则请你估算,若年生产总值不低于...2009年的2倍,至少要到_________年.(填写年份)(3)在(1)的条件下,2009--2013这四年间,比上一年增长的生产总值的平均数为多少百亿元?若按此平均数增长,请你预测2014年北京地区的生产总值多少百亿元?解:6、(2014年海淀二模)20.为了满足广大手机用户的需求,某移动通信公司推出了三种套餐,资费标准如下表所示:套餐资费标准小莹选择了该移动公司的一种套餐,下面两个统计图都反映了她的手机消费情况.(1)已知小莹2013年10月套餐外通话费为33.6元,则她选择的上网套餐为套餐(填“一”、“二”或“三”);(2)补全条形统计图,并在图中标明相应的数据;(3)根据2013年后半年每月的消费情况,小莹估计自己每月本地主叫市话通话大约430分钟,发短信大约240条,国内移动数据流量使用量大约为120兆,除此之外不再产生其他费用,则小莹应该选择套餐 最划算(填“一”、“二”或“三”);选择该套餐后,她每月的手机消费总额约为 元. 7、(2014年西城二模)21.据报道:2013年底我国微信用户规模已到达6亿.以下是根据相关数据制作的统计图表的一部分:请根据以上信息,回答以下问题:(1)从2012年到2013年微信的人均使用时长增加了________分钟;35%42%11.75%11.25% 86.176.088.184.683.1总额/元月份套餐费用套餐外 通话费套餐外 短信费套餐外数 据流量费2013年后半年每月手机消费总额统计图(2)补全2013年微信用户对“微信公众平台”参与关注度扇形统计图,在我国6亿微信用户中,经常使用户约为_________亿(结果精确到0.1);(3)从调查数学看,预计我国微信用户今后每年将以20%的增长率递增,请你估计两年后,我国微信用户的规模将到达_________亿.8、(2014年通州二模)19.某区八年级有3000名学生参加“爱我中华知识竞赛”活动.为了了解本次知识竞赛的成绩分布情况,从中抽取了200名学生的得分进行统计. 请你根据不完整的表格,回答下列问题:(1)补全频率分布直方图;(2)若将得分转化为等级,规定50≤x <60评为“D ”,60≤x <70评为“C ”,70≤x <90评为“B ”,90≤x <100评为“A ”.这次全区八年级参加竞赛的学生约有多少学生参赛成绩被评为“D ”?9、(2014年东城二模)20. 图①表示的是某综合商场今年1—5月的商品各月销售总额的情况,图②表示商场服装部各月销售额占商场当月销售总额的百分比情况,观察图①、图②,解答下列问题:(1)来自商场财务部的数据报告表明,商场1—5月的商品销售总额一共是410万元,请你根据这一信息将图①中的统计图补充完整; (2)商场服装部5月份的销售额是多少万元?(3)小刚观察图②后认为,5月份商场服装部的销售额比4月份减少了,你同意他的看法吗?请说明理由.10、(2014年朝阳二模)20.某校对部分初三学生的体育训练成绩进行了随机抽测,并绘制了如下的统计图:女生篮球障碍运球成绩折线统计图 男生引体向上成绩条形统计图根据以上统计图解答下列问题:(1)所抽测的女生篮球障碍运球成绩的众数是多少?极差是多少?(2)该校所在城市规定“初中毕业升学体育现场考试”中,男生做引体向上满13次,可以获得满分10分;满12次,可以获9.5分;满11次,可以获得9分;满10次,可以获得8.5分;满9次,可以获得8分. ①所抽测的男生引体向上得分..的平均数是多少? ②如果该校今年有120名男生在初中毕业升学体育现场考试中报名做引体向上,请你根据本次抽测的数据估计在报名的这些学生中得分不少于9分的学生有多少人? 11、(2014年密云二模)20. 《中学生体质健康标准》规定学生体质健康等级标准为:86分及以上为优秀;76分~85分为良好;60分~75分为及格;59分及以下为不及格.某校抽取八年级学生人数的10%进行体质(1)在抽取的学生中不及格人数所占的百分比是 ;(2)小明按以下方法计算出所抽取学生测试结果的平均分是:(90+82+65+40)÷4=69.25.根据所学的统计知识判断小明的计算是否正确,若不正确,请写出正确的算式并计算出结果.12、(2014年延庆二模)13、(2014年房山二模) 20.房山某中学改革学生的学习模式,变“老师要学生学习”为“学生自主学习”,培养了学生自主学习的能力.小华与小明同学就“最喜欢哪种学习方式”随机调查了他们周围的一些同学,根据收集到的数据绘制了以下的两个统计图.请根据下面两个不完整的统计图回答以下问题:(1)这次抽样调查中,共调查了名学生;(2)补全两幅..统计图;(3)根据抽样调查的结果,估算该校1000名学生中大约有多少人选择“小组合作学习”?14、(2014年昌平二模)20.在某中学开展的“书香伴我行”读书活动中,为了解九年级300名学生读书情况,随机调查了九年级50名学生读书的册数.统计数据如下表所示:(1)这50个样本数据的众数是,中位数是;(2)根据样本数据,估计该校九年级300名学生在本次活动中读书多于2册的人数;(3)学校广播站的小记者对被调查的50名学生中读书册数最少和最多的人进行随即采访,请利用树状图或列表,求被采访的两人恰好都是读书册数最多的学生的概率.20.解:(1)众数为3,中位数为2. …………………………2分(2)在50名学生中,读书多于2本的学生有20名,所以,300×=120.………………………3分答:该校八年级300名学生在本次活动中读书多于2册的约有120名.(3)设读书最少的人为A,读书最多的人为B,B,B被采访的两人恰好都是读书册数最多的学生的情况如下:(B1,B2)、(B1,B3)、(B2,B1)、(B2,B3)、(B3,B1)、(B3,B2),共6种,所以,被采访的两人恰好都是读书册数最多的学生的概率为P==.………5分15、(2014年怀柔二模)20.从2013年1月7日起,中国中东部大部分地区持续出现雾霾天气。
状态方程解题法在北京2014初中物理压力浮力体积的运用
1. 一容器装满水后,容器和水的总质量为600g 。
若在容器内放入一质量为250g 的小金属块A 后再加满水,总质量为800g ;若在容器内放入一质量为250g 的小金属块A 和一质量也为250g 的小金属块B 后再加满水,总质量为950g ,则金属块A 和金属块B 的密度之比为A .4:7B .7:4C .1:2D .2:12. 某人在两山之间某处(距甲山较远)高声喊叫,他听到两次回声之间的间隔是t ,若声速是v ,此人到甲山的距离为S ,则甲乙两山之间的距离为___________。
(注:用题中所给字母表示)27. 体积为0.002m3的长方体,没入水中静止后,该物体最终悬浮在水中,当它受到水的向上的压力是30N时,它受到水的向下的压力是 N。
(g=10N/kg )41.底面积为5×10-3m2的圆柱形玻璃筒中装有适量的水,放在水平台面上。
如图20甲所示,将物体A 放入水中,A 漂浮且水未溢出,此时A 有五分之一的体积露出水面;如图20乙所示,将物体B 放在物体A 上,物体A 恰好浸没在水中且水未溢出,此时筒中水的高度比图18甲的高度上升了0.2 m 。
求:(1)物体A 的密度;(2)物体B 的重力; (3)物体A 的重力1.2.3. 有一个质量为m 0的玻璃瓶,瓶子的下半部分为圆柱形,底面积为S 。
装有一定量的水时,瓶子正放,水的深度为L 1,如图6甲;瓶子倒置,水面与瓶底的距离为L 2,如图6乙。
在瓶子中装满某种液体时,总质量为m 。
这种液体的密度为_____________。
4.5.6.7.8.9.10.14.有甲、乙两个实心小球。
它们的体积分别为V 甲和V 乙,密度分别为ρ甲和ρ乙,质量分别为m 甲和m 乙。
另有两个足够深的容器A 和B ,装有足量的密度分别为ρ A 和ρ B 的液体。
如果它们的密度关系为ρ A <ρ甲<ρ乙<ρ B ,则下列说法中正确的是A .若V 甲=V 乙,将甲和乙都放入A 中,静止时甲、乙受浮力之比为ρ甲∶ρ乙B .若V 甲=V 乙,将甲和乙都放入B 中,静止时甲、乙受浮力之比为1∶1C .若m 甲=m 乙,将甲放入A 中、乙放入B 中,静止时甲、乙受浮力之比为ρ A ∶ρ甲D .若m 甲=m 乙,将甲放入B 中、乙放入A 中,静止时甲、乙受浮力之比为ρ A ∶ρ乙26、某同学想测中国领土的面积。
北京门头沟2014中考物理二模试题及答案
2014年北京市门头沟区初三第二次统一练习物 理 试 卷 2014.6一、单项选择题:(下列各小题均有四个选项,其中只有一个选项符合题意。
共28分,每小题2分) 1.通常情况下,下列物品中属于绝缘体的是 A.永定河里的河水 B.干电池里的碳棒C.钢丝钳把手上的塑料套D.导线中的铜丝2.在颐和园的昆明湖上,小红同学坐在航行的游艇内,若说她是静止的,则所选择的参照物是 A.湖岸 B.游艇 湖水 D.岸边的树3.图1所示的现象中,属于光的反射现象的是4.图2所示的四种工具中,属于省力杠杆的是5.下列关于温度、热量和内能变化的说法中,正确的是A.物体温度升高,它的内能一定增加B.物体温度升高,一定是外界对物体做功C.物体温度不变,它的内能一定不变D.物体温度降低,一定是物体放出了热量 6.下列现象中,不能..说明分子处在永不停息的无规则运动中的是A.花开时香气扑鼻B.扫地时尘土飞扬C.红墨水在水中散开D.衣柜里的樟脑丸过一段时间变小了 7.图3所示的四个实例中,目的是为了减小压强的是8.图4所示的四个情景中,其物态变化过程需要吸热的是9.如图5所示的四种情景中,人对物体做功的是10.下列说法中正确的是A.接入同一电路中的两个导体电阻大小不相等,则通过它们的电流也不相等B.带有异种电荷的两个小球互相靠近,会互相排斥C.电动自行车在给蓄电池充电时,是将化学能转化为电能D.原子弹和氢弹爆炸时,释放的都是核能11. 下列选项是对质量和长度的估测,其中最接近实际的是A.一个鸡蛋的质量约为500gB.一位中学生身高约为1.6mC.一块橡皮的质量约为10kgD.一支未用过的2B铅笔的长度约为15mm12.图6甲所示为一台电压力锅,它结合了高压锅和电饭锅的优点,省时省电、安全性高。
当电压力锅内部气压过大或温度过高时,发热器都会停止工作。
图6乙中S1为过压保护开关,S2为过热保护开关,压强过大时开关S1自动断开,温度过高时开关S2自动断开。
门头沟区2014年初三二模考试试卷
门头沟区2014年初三二模考试试卷22. The girl is at school. __________ is busy with her work.A. HeB. HimC. SheD. Her23. —Hi, Mike, I’ve got a present __________ you.—Oh, it’s really beautiful. Thank you very much.A. inB. onC. ofD. for24. Be quick, __________ you’ll be late for school.A. orB. soC. andD. but25. —__________ do you go to the cinema?—Once a month.A. How longB. How manyC. How muchD. How often26. This box is __________ than that one.A. heavyB. heavierC. heaviestD. the heaviest27. —__________ she sing English songs?—Yes, she can.A. CanB. MustC. NeedD. Should28. __________ of his parents are doctors.A. EachB. BothC. AllD. Some29. —Lucy, let me __________ a look at your new watch.—Ok, dad.A. hasB. haveC. to haveD. having30. Mary __________ to school on foot every morning.A. goB. goesC. wentD. will go31. There __________ a football match between China and England tomorrow.A. isB. wasC. will beD. has been32. Mike __________ TV when his mother came back home yesterday.A. watchedB. is watchingC. was watchingD. has watched33. English __________ all over the world.A. speaksB. is speakingC. is spokenD. has spoken34. —Can you tell us __________ just now?—Sorry, I don’t know.A. what Miss Wang saysB. what Miss Wang saidC. what does Miss Wang sayD. what did Miss Wang say昌平区2014年初三年级第二次统一练习22. Dad, this is Tom and this is Mike. _____ are my new friends.A. TheyB. ThemC. TheirD. Theirs23. The summer holiday will begin _____July 27th.A. atB. inC. on D for24. You can find many English novels from Mr Zhao’s QQ ____ download them.A. andB. butC. orD. so25. --- ____ do you practice writing your compositions?--- Twice a week.A. How muchB. How longC. How oftenD. How old26. You ____ swim in the river here. It’s dangerous.A. can’tB. may notC. mustn’tD. needn’t27. Look! It ____ hard now. You’d better wait for a while until it stops.A. rainsB. has rainedC. will rainD. is raining28. She asked us _____ the dialogue and try to recite it.A. readB. readsC. to readD. reading29. Many people think that English is _____ of all the subjects.A. importantB. more importantC. most importantD. the most important30. We often talk in groups and share our ideas with _____.A. otherB. othersC. anotherD. the other31. I used to be afraid to speak in front of public before, but recently I _____ a lot.A. have improvedB. improvedC. will improveD. am improving32. My parents will buy a piano for me if I _____ good grades in the tests.A. getB. will getC. have gotD. got33. Some polluting factories _____ of by Beijing government soon in a few months.A. move outB. are moved outC. will be moved outD. were moved out34. The teacher asked me ____.A. when my uncle bought the carB. when will my uncle buy the carC. when did my uncle buy the carD. when my uncle will buy the car北京市朝阳区九年级综合练习(二)22. I can’t find my pen. Could you help ________?A. meB. herC. himD. them23. —When was this car made? It looks so old.—It was made _______1890.A. onB. inC. atD. of24. —Peter, would like to go shopping with me?—I’d like to , _______ I have to finish my homework first.A. andB. orC. butD. so25. There _______ many roads to happiness. It all depends on whether you can find them.A. isB. wasC. areD. were26.Our teacher often tells us ______enough sleep every day.A.to haveB.havingC. haveD. had27.—_________you go swimming with me tomorrow?—No, I can’t. It’s my father’s birthday.A. CanB. MayC. NeedD. Must28. —Doctor,________ do I have to take the medicine?—Three times a day.A. how oftenB. how manyC. how longD. how far29. —Which subject do you like ___________, Chinese or English?—English, of course.A. wellB. betterC. bestD. the best30. I ______ the note to Jim as soon as school is over.A. giveB. am givingC. will giveD. gave31. ---Who is the girl in the picture ?---Haha! It’s me! The picture ________ ten years ago.A. takesB. tookC. is takenD.was taken32. A few days ago, Miss Li ________ a meeting with everyone interested in music.A. holdsB. heldC. will holdD. was holding33.Mrs White _______________in France for a long time. She knows a lot about that country.A.livedB. was livingC. will liveD. has lived34. ---Sally, could you tell me ?--- Next Friday.A. when will we have the English partyB. when did we have the English partyC. when we will have the English partyD. When we had the English party大兴区2014年中考第二次模拟检测试卷22. ---Would you please send ______best wishes to Joe?---Yes, I’d love to.A.IB. myC. meD. mine23. ---_____are your twin sisters, John?---They have gone to the Great Wall.A. WhereB. HowC. WhyD. What24. Ms Smith is careful enough to get ________ready before her trip.A. somethingB. anythingC. nothingD. everything25. ---Do you often write____ your pen pals?---Yes, I do.A. forB. toC. atD. on26. ---How are you feeling now?--- I’m feeling much ______than before. Take me to the hospital, please.A. badB. worseC. worstD. the worst27. Peter wants to be a scientist _______he grows up.A. thoughB. ifC. whenD. after28. Mike is good at high jump. He _____jump over 1.7 meters high.A. canB. needC. mustD. should29. ---Sam, your brother _______in the next room. Don’t make a noise!---All right. I’ll go and play outside.A. sleepsB. sleptC. will sleepD. is sleeping30. Tom _______in New York since he went abroad two years ago.A. livedB. will liveC. was livingD. has lived31. Everyone will put on weight if he _____too much each meal.A. will eatB. has eatenC. eatsD. ate32. ---I’m sorry to keep you _______for a long time.---It doesn’t matter. I’ve just arrived.A. to waitB. waitingC. waitedD. wait33. Susan’s money ______in the street the day before yesterday.A. was stolenB. is stolenC. will stealD. has stolen34. ---Do you know ____________a volleyball match next Monday?---Sorry, I don’t know. Let’s go and ask our monitor.A. whether we will haveB. whether we haveC. whether will we haveD. whether do we have北京市东城区2013—2014 学年第二学期综合练习(二)22. Jim has a sister. He likes playing games with ________.A. meB. youC. herD. him23. — Thank you so much ________ your advice.—It’s a pleasure.A. withB. forC. ofD. to24. Put on your coat, ________ you may catch a cold.A. andB. soC. butD. or25. The beach is not as ________ as it used to be. Let’s collec t the rubbish.A. cleanB. cleanerC. cleanestD. the cleanest26. —________ are we going to meet?—In front of the shopping center.A. WhenB. WhereC. HowD. Why27. —________ I use your pen?—Sure. Here you are.A. MustB. NeedC. MayD. Should28. Lily and Grace are my best friends. ________ of them are very smart.A. AllB. BothC. SomeD. Any29. —Where is Gary?—He _______ in the library.A. readB. readsC. is readingD. will read30. Wang Hui hopes ________ a scientist in the future.A. beB. beingC. to beD. been31. We will wait until everyone ________ back.A. comesB. comeC. will comeD. is coming32. I like the movie Harry Potter very much. I ________ it three times.A. watchB. watchedC. was watchingD. have watched33. The milk ________ to us tomorrow.A. will sendB. is sentC. sendsD. will be sent34. —Do you know ________ the school?—About twenty minutes ago.A. when he leftB. when did he leaveC. when he leavesD. when does he leave2014年房山区初三年级适应性训练22.—Is the girl in the red skirt your sister?—No. She is____ classmate.A. yourB. myC. herD. his23. —When did you live in Beijing, Mary?— I lived there____ 2008 to 2013.A. onB. fromC. forD. of24. David is ____ student in our class. Nobody is taller than him.A. tallB. tallerC. tallestD. the tallest25. —Are you going out now, Lucy ?—No, I’m hungry. I’ll get ____ to eat before I g o out.A. somethingB. anythingC. nothingD. everything26. I got up late yesterday, ____ I had to take my breakfast with me on the bus.A. andB. butC. orD. so27. — Jenny, I need some milk.—OK, Mum.____ do you need?A. How longB. How farC. How oftenD. How much28. — ____ you sing the English song?— Yes, I can.A. CanB. MayC. MustD. Need29. She raised her voice to make everybody in the room ____ her clearly.A. heardB. to hearC. hearD. hearing30.—I didn’t see you when I went to your office yesterday afternoon. Where were you?—I ____ a meeting in the meeting room.A. haveB. will haveC. am havingD. was having31. My friend John called and ____me to his party just now.A. will inviteB. invitedC. invitesD. has invited32. Miss Lin ____ a lot of work for the poor area for about 10 years.A. doesB. didC. has doneD. will do33. Our classroom is tidy because it ____ every day.A. cleansB. cleanedC. is cleanedD. was cleaned34. —How will your father go to Shanghai tomorrow?—I don’t know ____ .A. how he will go thereB. how will he go thereC. how did he go thereD. how he went there丰台区2013-2014学年度第二学期统一练习(二)22. Peter comes from Australia. ______ is a teacher.A. IB. SheC. HeD. It23. Our family will leave for Shanghai______ Sunday morning.A. onB. atC. inD. for24. Linda is very kind, _______ many people like her.A. andB. soC. orD. but25. Our playground is one of _____ playgrounds in our city.A. bigB. biggerC. biggestD. the biggest26. My mother often teaches me how_______.A. cooksB. cookC. cookingD. to cook27.—What is your grandpa doing, Emma?—He ______the flowers in the yard.A. watersB. is wateringC. wateredD. will water28. My little brother _______ speak English because he is only six months old.A. can’tB. mustn’tC. shouldn’tD. needn’t29. Frank ______ a film with me if he’s free next Saturday.A. seesB. sawC. has seenD. will see30. —_______ is your home from your school?—Quite near. It’s about 10 minutes’ walk on foot.A. How longB. How oftenC. How farD. How many31. Kate ______ well last night. She had a headache.A. didn’t sleepB. do es n’t sleepC. has n’t sleptD. won’t sleep32. Sam and his friends _______ here for ten years.A. liveB. livedC. are livingD. have lived33. Several new schools _________ in Fengtai District next year.A. will buildB. were builtC. will be builtD. built34. I want to know ______yesterday.A. what Mary will doB. what will Mary doC. what Mary didD. what did Mary do海淀区九年级第二学期期末练习22. Eric is a kind boy. He likes to help ______ classmates.A. herB. hisC. itsD. your23. I watched the Super Brain ______ March 28thA. inB. atC. onD. to24. Jennifer often ______ some housework after school.A. didB. doesC. will doD. is doing25. Carla asked us ______ the magic club yesterday.A. joinB. joinC. to joinD. joining26. The two brothers are really different. One is quiet, ______ is active.A. otherB. othersC. anotherD. the other27. -- Excuse me, _______ you show me around the college?--Sorry, I‘m new here.A. canB. mayC. mustD. need28. Tim runs as ______ as his brother.A. fastB. fasterC. fastestD. the fastest29. I called you last night, but you ______ a meeting at that time.A. have hadB. will haveC. are havingD. were having30. I felt hungry when I got home, ______ I made myself a sandwich.A. soB. orC. butD. for31. ______ is your favorite star?--Li Na, the great tennis player.A. HowB. WhoC. WhatD. Where32. --Where is Tina? Ms. White is looking for her.-- She ______ the playground.A. went toB. goes toC. will go toD. has gone to33. The iPad ______ in 2010. And it is popular now.A. inventsB. inventedC. is inventedD. was invented34. -- Do you know ______ the graduation photo?--Next Thursday.A. when we tookB. when did we takeC. when we will takeD. when will we take平谷区2013-2014学年度初三统练(一)22. —Who is the woman in red?—_________ is our English teacher.A. SheB. HeC. ID. You23. —Do you know your father’s birthday?—Yes. It’s _________ October 3rd.A. inB. onC. atD. to24. Work hard, _______ you will fall behind others.A. soB. orC. andD. but25. —_______ does it take you to walk to school every day?—About half an hour .A. How manyB. How oftenC. How soonD. How long26. You_______ cross the road when the traffic lights are red.A. canB. mustC. mustn’tD. needn’t27. We’ve got two houses. One is big, _________ is small.A. anotherB. otherC. the otherD. others28. Li Xin often asks his father ________to work for protecting the environment.A. driveB. droveC. to driveD. not to drive29. Beijing, the capital of China, has become one of _________ cities in the world.A.the busiest B.busier C.busiest D.busy30. —Tom, where is your mum?—She_________ in the kitchen.A. cooksB. is cookingC. was cookingD. cooked31. —What is your plan for this weekend?—We _______ mountains.A. climbB. will climbC. climbedD. have climbed32. The students _________ many trees along the river since 2000.A. plantB. plantedC. has plantedD. have planted33. A big shopping centre _______ in our town next year. .A. is builtB. was builtC. will buildD. will be built34. —Could you tell me _____________ for England?—Next month.A. when will we leaveB. when did we leaveC. when we leftD. when we will leave北京市石景山区2014年初三统一练习暨毕业考试22. I like the little girl, so I tried to help ______.A. himB. herC. itD. them23. Ten students in our class will celebrate their birthdays ______ October.A. inB. onC. ofD. at24. — Mum, ______ are my shoes?— Under your bed. You should put away your things.A. whichB. whatC. whenD. where25. Jim likes coffee ______ I prefer tea.A. orB. becauseC. butD. so26. — ______ I have some more cake?—No, I’m afraid you can’t.A. MustB. CanC. ShouldD. Need27. ______ is waiting for you at the gate. She’s got a letter for you.A. NobodyB. AnybodyC. SomebodyD. Everybody28. I want ______ some bird-watching this weekend.A. doB. didC. doingD. to do29. She likes tennis and she thinks it’s ______ of all sports.A. interestingB. more interestingC. most interestingD. the most interesting30. Last year my father ______ the city where he was born.A. visitedB. visitsC. will visitD. is visiting31. The sweater can’t ______ in the machine.A. washB. washedC. be washedD. be washing32. His book is wonderful. I ______ it for three times.A. readB. have readC. am readingD. will read33. I _______ you a ring if I hear anything.A. will giveB. gaveC. have givenD. give34. If you can’t find the place, I’ll show you ______.A. where is itB. where it wasC. where was itD. where it is通州区初三英语毕业考试19. —Do you know Li Gang?—Sure. I know ____ very much.A. heB. himC. hisD. himself20. The movie will begin ____ half past three.A. onB. inC. forD. at21. Which sport do you like ____, swimming or running?A. goodB. wellC. betterD. best22. —____ are you talking about?—We’re talking about a TV play.A. WhatB. HowC. WhenD. Which23. I was very tired last night, ____ I went to bed early.A. soB. butC. orD. for24. —Must I come tomorrow?—No, you ____. We can finish it ourselves.A. can’tB. may notC. needn’tD. won’t25. My mother usually ____ a walk after supper every day.A. takeB. takesC. is talkingD. will take26. I ____ you as soon as I get the tickets.A. callB. will callC. am callingD. have called27. —Are you free this Sunday?—No. Yesterday I ____ to go to a meeting at 8: 00.A. tellB. toldC. is toldD. was told28. We ____ two tests tomorrow morning, History and Math.A. haveB. will haveC. have hadD. were having29. —Are you new here?—No. We ____ here for 8 years.A. livedB. will liveC. have livedD. are living30. My father told us ____ in America. He said he had a good time there.A. what does he seeB. what did he seeC. what he seesD. what he saw北京市怀柔区2014年高级中等学校招生模拟考试(二)22. My sister is a great fan of Justin. _______ has most of Justin’s CDs.A. HeB. SheC. HerD. His23. I could ride a bike _______ the age of 4 years old.A. onB. toC. atD. of24. --- Who is in the classroom?---_______ . All the students are in the library.A. NobodyB. SomebodyC. AnybodyD. Everybody25. ---There______ an exciting soccer game on TV last night, but I missed it.---What a pity!A. isB. areC. was D were26. Go downstairs, _______ stand in line on the playground quickly.A. orB. andC. soD. but27. Chen Ou is _______ Chinese CEO in NYSE(纽约证券交易所).A. youngB. youngerC. youngestD. the youngest28. We ________ APEC conference (亚太经合会议) in the Autumn of 2014 in Huairou.A. holdB. heldC. will holdD. was holding29. _________ I see your ID card, Sir? We have to check your information.A. ShouldB. MayC. MustD. Need30. --- _________ book is this?--- It’s Lily’s.A. WhoB. WhichC. WhatD. Whose31. My parents don’t allow me to watch TV until I finish _________ homework.A. doB. to doC. doingD. did32. — I called you yesterday evening, but you were not in.— Sorry, I ______ in the shop with my mother.A. amB. will beC. wasD. have been33. Many trees ________ around the city, so we have fresh air now.A. plantB. will plantC. plantedD. are planted34. If you can’t find the place, I will show you __________.A. where it is.B. where it wasC. where is itD. where was it密云县2014年第二次综合检测22. Kate and Alice are good friends. ________ often help each other.A. TheyB. ThemC. TheirD. Theirs23. We usually read English ________ the morning.A. onB. inC. atD. of24. Tom was ill yesterday, ________ he didn’t go to school. But he’s better now.A. orB. butC. forD. so25. — ________ did you put my glasses just now, Bill?—On the desk.A. WhereB. WhyC. WhatD. When26. I knocked on the door but ________ answered.A. somebodyB. anybodyC. nobodyD. everybody27. Mr. Wang _______ dinner with his family now. They look very happy.A. haveB. hasC. is havingD. was having28. Ben is one of ________ students in our class. He keeps doing sports every day.A. strongB. strongerC. strongestD. the strongest29. —Oh, you look tired. Why?—I ________ to the Great Wall yesterday. It was really wonderful.A. wentB. will goC. goesD. go30. The boy has a cold and the doctor asks him ________ more water.A. drinkB. to drinkC. drinksD. drinking31. Don’t worry. He ________ you as soon as he gets home.A. callB. callsC. will callD. called32. —Is your brother at home?—No. He ________ the library. He hasn’t come back yet.A. was going toB. has been toC. has gone toD. goes to33. Chinese ________by more and more people in the world now.A. speaksB. is speakingC. spokeD. is spoken34. —Lisa, do you remember ________ yesterday?—Of course.A. what did the teacher sayB. what the teacher saidC. what will the teacher sayD. what the teacher will say。
2014年北京市各城区中考二模数学——填空题12题汇总
x2014年北京市各城区中考二模数学——填空题12题汇总1、(2014年门头沟二模)12. 我们知道,一元二次方程12-=x 没有实数根,即不存在一个实数的平方 等于-1,若我们规定一个新数“i ”,使其满足12-=i (即方程12-=x 有一个根为i ),并且进一步规定: 一切实数可以与新数进行四则运算,且原有的运算律和运算法则仍然成立,于是有,1i i =12-=i ,,).1(23i i i i i -=-=⋅=.1)1()(2224=-==i i 从而对任意正整数n ,则6i =______________;由于,.)(.4414i i i i i i n n n ===+同理可得,1,,143424=-=-=++n n n i i i i 那么,20132012432i i i i i i +⋅⋅⋅++++的值为________________2、(2014年丰台二模)12.如图,在数轴上,从原点A 开始,以AB=1为边长画等边三角形,记为第一个等边三角形;以BC=2为边长画等边三角形,记为第二个等边三角形;以CD=4为边长画等边三角形,记为第三个等边三角形;以DE=8为边长画等边三角形,记为第四个等边三角形;……按此规律,继续画等边三角形,那么第五个等边三角形的面积是 ,第n 个等边三角形的面积是.3、(2014年平谷二模)12.如图,□ABCD 的面积为16,对角线交于点O ;以AB 、AO 为邻边做□AOC 1B ,对角线交于点O 1;以AB 、AO 1为邻边做□AO 1C 2B ,对角线交于点O 2;…;依此类推.则□AOC 1B 的面积为_______;□AO 4C 5B 的面积为_______;□AO n C n+1B 的面积为___________.4、(2014年顺义二模) 12.如图,正方形ABCD 的边长为3,点E ,F 分别在边AB ,BC 上,AE =BF =1,小球P 从点E 出发沿直线向点F 运动,每当碰到正方形的边时反弹,反弹时反射角等于入射角.当小球P 第一次碰到BC 边时,小球P 所经过的路程为 ;当小球P 第一次碰到AD 边时,小球P 所经过的路程为 ;当小球P 第n (n为正整数)次碰到点F 时,小球P 所经过的路程为 .5、(2014年石景山二模)12.如图,已知直线l :y =x ,过点A 1(1,0)作x 轴的垂线交直线l 于点B 1,以A 1 B 1为边作正方形A 1 B 1C 1 A 2,过点A 2作x 轴的垂线交直线l 于点B 2,以A 2 B 2为边作正方形A 2 B 2 C 2 A 3,…;则点A 5的坐标为 , 点C n 的坐标为 .6、(2014年海淀二模)12.平面直角坐标系中有一点(1, 1)A ,对点A 进行如下操作:C 3C 2C 1y=xB 3B 2B 1A 4A 3A 2A 1O xy第12题图A BC D1-1E-2(2,0)xy O 第一步,作点A 关于x 轴的对称点1A , 延长线段1AA 到点2A ,使得122A A =1AA ; 第二步,作点2A 关于y 轴的对称点3A , 延长线段23A A 到点4A ,使得34232A A A A =; 第三步,作点4A 关于x 轴的对称点5A , 延长线段45A A 到点6A ,使得56452A A A A =; ·······则点2A 的坐标为________,点2014A 的坐标为________.7、(2014年西城二模)12.如图,在平面直角坐标系xOy 中,已知抛物线y =-x (x -3)(0≤x ≤3)在x 轴上方的部分,记作C 1,它与x 轴交于点O ,A 1,将C 1绕点A 1旋转180°得C 2,C 2与x 轴交于另一点A 2.请继续操作并探究:将C 2绕点A 2旋转180°得C 3,与x 轴交于另一点A 3;将C 3绕点A 2旋转180°得C 4,与x轴交于另一点A 4,这样依次得到x 轴上的点A 1,A 2,A 3,…,A n ,…,及抛物线C 1,C 2,…,C n ,….则点A 4的坐标为 ;C n 的顶点坐标为 (n 为正整数,用含n 的代数式表示) .8、(2014年通州二模)12.如图,二次函数(2)(02)y x x x =-≤≤的图象,记为C 1,它与x 轴交于点O ,A 1;将C 1绕点A 1旋转180°得C 2,交x 轴于点A 2;将C 2绕点A 2旋转180°得C 3,交x 轴于点A 3;……如此进行下去,直至得C 14. 若P (27,m )在第14段图象C 14上,则m = .9、(2014年东城二模)12.如图,矩形BCDE 的各边分别平行于x 轴或y 轴,物体甲和物体乙由点A (2,0)同时出发,沿矩形BCDE 的边作环绕运动,物体甲按逆时针方向以1个单位/秒匀速运动,物体乙按顺时针方向以2个单位/秒匀速运动,则两个物体运动后的第2次相遇地点坐标是 ;第2014次相遇地点的坐标是 .yxO第12题图 C 1A 1C 2A 2A 3……C 310、(2014年朝阳二模)12.把长与宽之比为2的矩形纸片称为标准纸.如果将一张标准纸ABCD 进行如下操作:即将纸片对折并沿折痕剪开,则每一次所得到的两个矩形纸片都是标准纸(每一次的折痕如下图中的虚线所示).若宽AB =1,则第2次操作后所得到的其中一个矩形纸片的周长是_________;第3次操作后所得到的其中一个矩形纸片的周长是_________;第30次操作后所得到的其中一个矩形纸片的周长是_________.11、(2014年密云二模)12.如图,设四边形ABCD 是边长为1的正方形,以正方形ABCD 的对角线AC 为边作第二个正方形ACEF ,再以第二个正方形的对角线AE 为边作第三个正方形AEGH ,如此下去L L . (1)记正方形ABCD 的边长为11a =,按上述方法所作的正方形的边长依次为2a ,3a ,4a ,L ,n a ,求出4a = ;(2) 根据以上规律写出第n 个正方形的边长n a 的表达式 .(n>=1)(n 是自然数)12、(2014年延庆二模)13、(2014年房山二模) 12.矩形A 1B 1C 1O ,A 2B 2C 2C 1,A 3B 3C 3C 2,…按如图所示放置.点A 1,A 2,A 3,A 4…和点C 1,C 2,C 3,C 4…,分别在直线y kx b =+ (k >0)和x 轴上,若点B 1(1,2),B 2(3,4),且满足2334n 1122334451n n n A A A A A A A A A A A A A A A A -+====L ,则直线y kx b =+的解析式为 ,点3B 的坐标为 ,点n B 的坐标为_ .C 4B4y=kx+bC 3C 2B 3B 2C 1A 4B 1A 3A 2A 1yxO第一次第二次 第三次…JIEAH GF D14、(2014年昌平二模)12.如图,在平面直角坐标系中,已知点()()3,00,4A B -,,对△AOB 连续作旋转变化,依次得到三角形①、②、③、④、…,则第⑦个三角形的直角顶点的坐标是 ;第 个三角形的直角顶点的坐标是 .xy ②④③①-19121614O BA15、(2014年怀柔二模)12.如图(a ),有一张矩形纸片ABCD ,其中AD=6cm ,以AD 为直径的半圆,正好与对边BC 相切,将矩形纸片ABCD 沿DE 折叠,使点A 落在BC 上,如图(b ).则半圆被覆盖部分(阴影部分)的面积为_____________.错误!未找到引用源。
2014北京各区二模语文答案(一)
海淀区九年级第二学期期末练习语文参考答案及评分标准 2014.6一、基础.运用(共28分)(一)选择。
(共14分)1.C 2.B 3.B 4.D 5.C 6.A 7.D(二)填空(共10分)8.(1)会当凌绝顶(2)沉舟侧畔千帆过(3)赢得生前身后名(4)征于色发于声(5)采菊东篱下悠然见南山(共7分。
每空1分,有错别字该空不得分)9.①不捕鸟(或听长妈妈讲故事)②阿长与〈山海经〉③想去看戏却被父亲叫住背书(共3分。
每空1分)(三)简答(共4分)10.(1)小孩看见妈妈给奶奶洗脚,也端来一盆水给妈妈洗脚。
(1分)(2)我要经常给爸爸妈妈做些事。
孝顺长辈,身教重于言教。
孝道是家庭幸福、社会和谐的根本。
(共3分。
每小题1分)二、文言文阅读(共10分)11.(1)他,指项燕的(2)带领将领(共4分。
共2小题,每小题2分)12.有人认为(他)死了,有人认为(他)逃走了。
(共2分)13.1天下苦秦久矣2宗师争夺,自相鱼肉3打着扶苏项燕的旗号,倡导天下4派出大将统兵出师北伐(共4分,每小题1分)三、现代文阅读(共32分)(一)(共14分)14.答案示例:情景二:在杭州刘伯伯赏梅吟诗作画情景四:在台北我品读梅花图(共4分。
共4小题,每空2分)15.答案示例:交代写梅记事的时令背景,衬托梅花凌寒傲雪精神,并作为线索贯穿全文。
(共3分)16.答案示例:外公的教导、抗战后犹见绿梅兀立绽放的画面,以及任老师所画梅花图,写出了中国人心中梅花的象征意义:小而言之,她是不畏艰难的奋斗勇气;大而言之,她是历经忧患而傲然独立、坚贞不屈的中华民族精神。
刘伯伯、父亲与任老师等父辈对梅花欣赏与推崇,表明了中国人对高洁、雅致的人生境界的追求。
(共7分。
象征意义,4分;结合内容,2分;语言表达,1分)(二)(共10分)17.①利用季风来确定出航,返航时间②多种定向导航技术与运用漂物测速技术③完备的通讯技术(共3分)18.答案示例:古代海船航主要依靠风力。
2014年北京市各城区中考二模数学——几何综合题24题汇总
图2图1ED C AEDDC2014年北京市各城区中考二模数学——几何综合题24题汇总1、(2014年门头沟二模)24. 在△ABC 中,AB=AC ,分别以AB 和AC 为斜边,向△ABC 的外侧作等腰直角三角形,M 是BC 边中点中点,连接MD 和ME(1)如图24-1所示,若AB=AC ,则MD 和ME 的数量关系是 (2)如图24-2所示,若AB ≠AC 其他条件不变,则MD 和ME 具有怎样的数量和位置关系?请给出证明过程;(3) 在任意△ABC 中,仍分别以AB 和AC 为斜边,向△ABC 的内侧..作等腰直角三角形,M 是BC 的中点,连接MD 和ME ,请在图24-3中补全图形,并直接判断△MED 的形状.2、(2014年丰台二模)24.如图1,在ABC △中,90ACB ∠=°,2BC =,∠A=30°,点E ,F 分别是线段BC ,AC 的中点,连结EF .(1)线段BE 与AF 的位置关系是________, AFBE =________.(2)如图2,当CEF △绕点C 顺时针旋转α时(0180α<<),连结AF ,BE ,(1)中的结论是否仍然成立.如果成立,请证明;如果不成立,请说明理由.(3)如图3,当CEF △绕点C 顺时针旋转α时(0180α<<),延长FC 交AB 于点D ,如果6AD =-α的度数.3、(2014年平谷二模)24.(1)如图1,在四边形ABCD 中,∠B =∠C =90°,E 为BC 上一点,且CE =AB ,BE =CD ,连结AE 、DE 、AD ,则△ADE 的形状是_________________________.(2)如图2,在90ABC A ∆∠=︒中,,D 、E 分别为AB 、AC 上的点,连结BE 、CD ,两线交于点P .①当BD=AC ,CE=AD 时,在图中补全图形,猜想BPD ∠的度数并给予证明. ②当BD CEAC AD==时, BPD ∠的度数____________________.4、(2014年顺义二模) 24.在△ABC 中, A B = AC ,∠A =30︒ 将线段 B C 绕点 B 逆时针旋转 60︒得到线段 B D ,再将线段BD 平移到EF ,使点E 在AB 上,点F 在AC 上. (1)如图 1,直接写出 ∠ABD 和∠CFE 的度数; (2)在图1中证明: A E =CF ; (3)如图2,连接 C E ,判断△CEF 的形状并加以证明.图2图1BCBDEAAFA图24-1图24-2图24-35、(2014年石景山二模)24.将△ABC 绕点A 顺时针旋转α得到△ADE ,DE 的延长线与BC 相交于点F ,连接AF .(1)如图1,若BAC ∠=α=︒60,BF DF 2=,请直接写出AF 与BF 的数量 关系;(2)如图2,若BAC ∠<α=︒60,BF DF 3=,猜想线段AF 与BF 的数量关 系,并证明你的猜想;(3)如图3,若BAC ∠<α,mBF DF =(m 为常数),请直接写出BFAF的值 (用含α、m 的式子表示). 解:6、(2014年海淀二模)24.在ABC △中,90ABC ∠=,D 为平面内一动点,AD a =,AC b =,其中a , b 为常数,且 a b <. 将ABD △沿射线BC 方向平移,得到FCE △,点A 、B 、D 的对应点分别为点F 、C 、E .连接BE .(1)如图1,若D 在ABC △内部,请在图1中画出FCE △;(2)在(1)的条件下,若AD BE ⊥,求BE 的长(用含, a b 的式子表示);(3)若=BAC α∠,当线段BE 的长度最大时,则BAD ∠的大小为__________;当线段BE的长度最小时,则BAD ∠的大小为_______________(用含α的式子表示).图1 备用图7、(2014年西城二模)24.在△ABC ,∠BAC 为锐角,AB >AC , AD 平分∠BAC 交BC 于点D .(1)如图1,若△ABC 是等腰直角三角形,直接写出线段AC ,CD ,AB 之间的数量关系;(2)BC 的垂直平分线交AD 延长线于点E ,交BC 于点F .①如图2,若∠ABE =60°,判断AC ,CE ,AB 之间有怎样的数量关系并加以证明;②如图3,若AC AB AE +=,求∠BAC 的度数.8、(2014年通州二模)23.已知:△ABD 和△CBD 关于直线BD 对称(点A 的对称点是点C ),点E 、F 分别是线段BC 和线段BD 上的点,且点F 在线段EC 的垂直平分线上,连接AF 、AE ,AE 交BD 于点G .(1)如图l ,求证:∠EAF =∠ABD ;(2)如图2,当AB =AD 时,M 是线段AG 上一点,连接BM 、ED 、MF ,MF 的延长线交ED 于点N ,∠MBF =12∠BAF ,AF =23AD ,请你判断线段FM 和FN 之间的数量关系,并证明你的判断是正确的.AB CAB BD DB图2EQP DC BA9、(2014年东城二模)24.如图,等腰Rt△ABC中,∠ACB=90°,AC=BC=4,P是AC边上一动点,由A向C运动(与A、C不重合),Q是CB延长线上一点,与点P同时以相同的速度由B 向CB延长线方向运动(Q不与B重合),过P作PE⊥AB于E,连接PQ交AB于D.(1)当∠BQD=30°时,求AP的长;(2)当运动过程中线段ED的长是否发生变化?如果不变,求出线段ED的长;如果变化请说明理由;(3)在整个运动过程中,设AP为x,BD为y,求y关于x的函数关系式,并求出当△BDQ 为等腰三角形时BD的值.13、(2014年房山二模) 24. 边长为2的正方形ABCD的两顶点A、C分别在正方形EFGH的两边DE、DG上(如图1),现将正方形ABCD绕D点顺时针旋转,当A点第一次落在DF上时停止旋转,旋转过程中,AB边交DF于点M,BC边交DG于点N.(1)求边DA在旋转过程中所扫过的面积;(2)旋转过程中,当MN和AC平行时(如图2),求正方形ABCD旋转的度数;(3)如图3,设MBN的周长为p,在旋转正方形ABCD的过程中,p值是否有变化?请证明你的结论. 14、(2014年昌平二模)24.【探究】如图1,在△ABC中, D是AB边的中点,AE⊥BC于点E,BF⊥AC于点F,AE,BF相交于点M,连接DE,DF. 则DE,DF的数量关系为 .【拓展】如图2,在△A B C中,C B = C A ,点D是AB边的中点,点M在△A B C的内部,且∠MBC =∠MAC . 过点M作ME⊥BC于点E,MF⊥AC于点F,连接DE,DF. 求证:DE=DF;【推广】如图3,若将上面【拓展】中的条件“CB=CA”变为“CB≠CA”,其他条件不变,试探究DE与DF之间的数量关系,并证明你的结论.ADBE CMFADB E CMFMAB CDFE图3图2图116、(2014年大兴二模)25. 已知:E是线段AC上一点,AE=AB,过点E作直线EF,在EF上取一点D,使得∠EDB=∠EAB,联结AD.(1)若直线EF与线段AB相交于点P,当∠EAB=60°时,如图1,求证:ED =AD+BD;(2)若直线EF与线段AB相交于点P,当∠EAB= α(0º﹤α﹤90º)时,如图2,请你直接写出线段ED、AD、BD之间的数量关系(用含α的式子表示);(3)若直线EF与线段AB不相交,当∠EAB=90°时,如图3,请你补全图形,写出线段ED、AD、BD之间的数量关系,并证明你的结论.。
2014门头沟区初三二模英语试卷及答案含听力mp3-答案
门头沟区2014年初三二模考试试卷答案及评分标准听力理解(共26分)一、听对话,从下面各题所给的A、B、C三幅图片中选择与对话内容相符的图片。
(共4分,每小题1分)1. C2. A3. B4. C二、听对话或独白,根据对话或独白的内容,从下面各题所给的A、B、C三个选项中选择最佳选项。
(共12分,每小题1分)5. A6. C7. C8. A9. A 10. C11. B 12. A 13. C 14. C 15. B 16. C三、听对话,记录关键信息。
(共10分,每小题2分)17. bird 18. Sunday 19. 8:30 20. bus 21. twenty / 20知识运用(共25分)四、单项填空(共13分,每小题1分)22. C 23. D 24. A 25. D 26. B 27. A 28. B29. B 30. B 31. C 32. C 33. C 34. B五、完形填空(共12分,每小题1分)35. A36. A37. B38. D39. A40. C41. B 42. C 43. D 44. B 45. C 46. B阅读理解(共44分)六、阅读下列短文,根据短文内容,从短文后各题所给的A、B、C、D四个选项中,选择最佳选项。
(共26分,每小题2分)A 47. A 48.B 49. CB 50. A 51. D 52. BC53. A. 54. B 55. CD 56. D 57. A 58. D 59. B七、阅读短文,根据短文内容,从短文后的五个选项中选出能填入空白处的最佳选项。
选项中有一项为多余选项。
(共8分,每小题2分)60. D 61. C 62. E 63. A八、阅读短文,根据短文内容回答问题。
(共10分,每小题2分)64. Yes. / Yes, it is.65. Six. / 6.66. I should have two pencils and anything else I was asked to bring.67. Skip it and come back to it later.68. Ways of making sure of doing best on test days.书面表达(共25分)九、完成句子(共10分,每小题2分)69. had better70. Would you like to71. as early as72. were busy doing some cleaning73. d idn’t hear from his mother until十、文段表达(共15分)74. 根据中文和英文提示,写一封意思连贯、符合逻辑、不少于50词的回信。
英语_2014年北京市门头沟区中考二模英语试卷_复习
2014年北京市门头沟区中考二模英语试卷一、单选题1. The girl is at school. __________ is busy with her work.A HeB HimC SheD Her2. —Hi, Mike, I’ve got a present __________ you.—Oh, it’s really beautiful. Thank you very much.A inB onC ofD for3. Be quick, __________ you’ll be late for school.A orB soC andD but4. —__________ do you go to the cinema?—Once a month.A How longB How manyC How muchD How often5. This box is __________ than that one.A heavyB heavierC heaviestD the heaviest6. —__________ she sing English songs?—Yes, she can.A CanB MustC NeedD Should7. __________ of his parents are doctors.A EachB BothC AllD Some8. —Lucy, let me __________ a look at your new watch.—Ok, dad.A hasB haveC to haveD having9. Mary __________ to school on foot every morning.A goB goesC wentD will go10. There __________ a football match between China and England tomorrow.A isB wasC will beD has been11. Mike __________ TV when his mother came back home yesterday.A watchedB is watchingC was watchingD has watched12. English __________ all over the world.A speaksB is speakingC is spokenD has spoken13. —Can you tell us __________ just now?—Sorry, I don’t know.A what Miss Wang saysB what Miss Wang saidC what does Miss Wangsay D what did Miss Wang say二、完型填空14. Dad lost his job after arguing(争吵) with the boss, and when Christmas came that year, we had no money at all. On Christmas Eve, Dad took me out into the park. I had a blanket(毛毯) wrapped(卷绕) around me, so I offered to share____with Dad, but he said no thanks. We looked________at the sky. Those shining stars were one of the____treats for people like us who lived out in the wildness(荒凉). Rich city people, he’d say, live in fantastic flats, but their air was so polluted(污染的) that they could not even see the stars.“____out your favorite star.” Dad said that night. He told me I could have it for keeping. He said it was my Christmas present. “You can’t give me a star,” I said, “Nobody____the stars.”“Right,” Dad said, “But you can suppose it is yours. And when you do that, it is yours.”I____my head, looked at the stars, and tried to figure out(断定) which was the best one. Then, I found one.“I____that one.” I said.Dad smiled. “That’s Venus(金星),” he said, “Venus was only a planet. She looked bigger and brighter because she was much____than the stars. Poor old Venus didn’t even make her own light. She shone only from reflected(反射)____”“I like it anyway,” I said, “I had loved Venus even____that Christmas. You could see it in the early evening, and if you got up early, you could still see it in the morning, after all the stars had disappeared.”Dad said, “Ok, it’s Christmas. I____your decision. You can have it if you want.” And he gave me Venus.We all laughed about the kids who believed in the Santa myth(圣诞传说) and got nothing for Christmas but a bunch(堆) of cheap plastic toys. “Many years later, when all the junk(废物) they got is broken and long forgotten,” Dad said, “you will____have your star.”(1)A itB meC usD him(2)A upB forC outD after(3)A strangeB specialC importantD impossible(4)A GoB PutC TakeD Pick(5)A ownsB seesC likesD reaches(6)A lowedB putC raisedD rose(7)A needB wantC haveD hope(8)A slowerB fartherC closerD higher(9)A sunB starC planetD light(10)A whenB beforeC afterD until(11)A dislikeB refuseC acceptD consider(12)A evenB stillC neverD already三、阅读单选15. A(1)If you want to enjoy country music, you should call ________.A 8115608B 3102768C 2711399D 6935094(2)Where can you learn Spanish dancing?A In the cinema.B At John Black’s.C At Wanda Plaza.D At Rainbow Music Club.(3)You can watch Titanic (3D) at ________.A 7:50 a.m., June 1stB 9:00 p.m., June 28thC 9:50 p.m., June 2ndD 7:50 a.m., June 30tℎ16.Being safe in your everyday life needs knowledge(知识). If you remember following information, your life will be much safer.Always notice the environment around you. You shouldn’t walk alone outside. Make sure where the public phones are If anything dangerous happens, you can find them easily Your bag should be carried towards the front of your body instead of(而不是)putting it on your back. When a bus is full of people, it is easy enough for a thief to take away the things in the bag on If you are followed by(被跟踪)someone you don' t know, cross the street and go tothe other way, let the person understand that you know he or she is after you. Next, don' t go home at once You' are safer in the street than you are' alone in your home or in a lift(电梯). If you have to take a bus to a place far away, try to get to the stop a few minutes earlier before the bus leaves. This stops other people from studying you. On the bus, don't sit alone. Sit behind the driver or with other people. Don't sleep.(1)You'd better put your bag ______ when there are too many people on a bus.A on your backB beside youC in front of youD behind the driver(2)What does the underlined word "them" refers to in Paragraph 2?A the public phonesB the environment around youC anythingdangerous D people(3)Which is not right in following ideas if you are followed by someone you don't know?A Cross the street and go to the other way.B Don't go home at once.C Wait quietly and give some money to him or her.D Don't go into a lift.(4) what can you learn from the text?A How to notice the environment around you.B How to be safe in everydaylife. C How to cross the street. D How to use the public phones.17.I've loved my mother's desk since I was just tall enough to see above the top of it as other sat doing letters. Standing by her chair, looking at the ink bottle, pens, and white paper, I decided that the act of writing must be the most wonderful thing in the world. Years later, during her final illness, Mother kept different things for my sister and brother. "But the desk", she said, "is for Elizabeth".I never saw her angry, never saw her cry. I knew she loved me, she showed it in action. But asa young girl, I wanted heart-to-heart talks between mother and daughter. They never happened. And a gulf opened between us. I was "too emotional". But she lived "on the surface". As years passed, I had my own family. I loved my mother and thanked her for our happy family. I wrote to her in careful words and asked her to let me know in any way she chose that she did forgive me. I posted the letter and waited for her answer. None came. My hope turned to disappointment(失望), then little interest, finally, peace—it seemed that nothing happened. I couldn't be sure that the letter had even got to Mother. I only knew that I had written it, and I could stop trying to make her into someone she was not.Now the present of her desk told me, as she'd never been able to, that she was pleased that writing was my chosen work, I cleaned the desk carefully and found some papers inside—a photo of my father and a one-page letter, folded(被折叠)and refolded many times. Give me an answer, my letter asks, in any way you choose. Mother, you always chose the act that speaks louder than words.(1)The writer began to love her mother's desk ______.A after Mother diedB before she became a writerC when she was achild D when Mother gave it to her(2)The passage shows that ______.A Mother was cold on the surface but kind in her heart to her daughterB Mother wastoo serious about everything her daughter had done C Mother cared much about her daughter in words D Mother wrote to her daughter in careful words(3)The word "gulf" in the passage means ______.A deep understanding between the old and the youngB different ideas between the mother and the daughterC free talks between mother and daughterD part of the sea going far in land(4)What did Mother do with her daughter's letter asking forgiveness?A She had never received the letter.B For years, she often talked about theletter. C She didn't forgive her daughter at all in all her life. D She read the letter again and again till she died.(5)What's the best title of the passage?A My letter to MotherB Mother and ChildrenC My Mother's DeskD Talks Between Mother and Me18. Being an astronaut sounds cool, doesn't it? In space, they can do some pretty amazing things, like floating in zero gravity (重力).However, there are also plenty of things that astronauts can't do because of their weightless environment, and that's very sad. What's worse, they can't even let their sadness show ﹣ because it's impossible to cry in zero gravity.Of course, astronauts can' still have tears. But crying is much more difficult inspace. Without gravity, tears don't flow downward out of the eyes like they do on the earth. This means that when you cry in space, your tears have nowhere to go ﹣ they just stick to your eyes.In May 2011, astronaut Andrew Feustel experienced this during one of his spacewalks. "Tears," he said, "don't fall off your eyes. They just stay there." Besides making your vision (视力) unclear, this can also cause physical pain. Back on the earth,tears are supposed to bring comfort to the eyes. But that's not the same in space. The space environment dries out astronauts' eyes, and when tears suddenly wet the eyes, it can cause pain rather than comfort. "My right eye is painful like crazy." Feustel told his teammate during the walk.Since gravity doesn't work in space astronauts need some extra help to get rid of the tears.Feustel chose to rub his eyes against his helmet (头盔) to wipe the tears away. Another choice is to just wait ﹣﹣ "When the tears get big enough, they simply break free of the eye and float around, astronaut Ron Parise said.There are lots of small things ﹣ things like crying that we are so used to on the earth. We usually take them for granted (认为理所当然), until they become a problem in a completely different environment, like space. There, astronauts can't talk to each other directly. They can't eat or drink in normal ways; They can't even burp (打嗝) because there is no gravity to hold the food down in their stomachs. If they do burp, they just endup throwing up (呕吐) everything in their stomachs, according to the UK National Space Center.________(88). Is crying more difficult in space than on the earth?________(89). What happens to tears when astronauts cry in space?________(90). Who experienced that the tears in space caused pain rather than comfort?________(91). How do astronauts get rid of the tears in space?________(92). Why can't astronauts burp in space?________(93). In the last paragraph, the writer says: perhaps it's only space explorers who can honestly say: "Gravity, you're the best." Do you agree with the writer? Why or why not?________四、填写适当的句子补全对话19.Reading for pleasure is the easiest way to become a better reading English. It is also the most important way. Some student say don't it to for pleasure. They say they want to use theirtime to use their time to learn the rules of the language and new words. They say that pleasure reading is too easy.Many experts(专家)say pleasure reading is very important for learning English. Dr. Stephen Krashen, a famous expert on learning languages, says that pleasure reading helpsyou learn many important things about English. Students learn more grammar and more words when they read for pleasure. They also learn more about good writing.Dr. Krashen tells us that pleasure reading helps each student in a different way. Each student needs to learn something different. Pleasure reading makes it possible for each student to learn what he or she needs.Reading for pleasure is not the same as studying. When you read for pleasure, you choose your own books, and you don't have to remember everything. There are no tests on your pleasure reading books. Pleasure reading will help you:Learn how English speakers use English.Read faster in English.Find examples of good writing in English.Learn new words.If you want to learn about the cultures of English speakers, it will also help.(1)From the first paragraph, we can know some students think pleasure reading is________.A difficultB easyC popularD boring(2)Who is Dr. Stephen Krashen?A An expert on learning languages.B An expert on teaching English.C An expert on saving the animals.D An expert on reading books.(3)Which of the following belongs to pleasure reading?A Students will learn fewer words.B Student have to remember everything.C Students need to have many tests.D Students will learn what they need.(4)Pleasure reading will help you in ________ ways.A twoB threeC fourD five(5)Which of the following might be the best title?A Reading for StudyB Reading for WritingC Reading for PleasureD Reading for English五、回答问题20. Now you've nearly finished three years of English study.There's one way to demonstrate(展示) what you've learned﹣take a test!Do you have any special methods you use to help you do better on a test?How well you do is often a matter of how well prepared you are.Here are some ways to make sure you're at your best on test days.Go to bed early.The night before a test is not the time to stay up watching TV.You want to be rested and wide﹣awake for test day.Have a good breakfast.Test day isn't a morning for donuts(面包圈).Nor is it a time to starve(挨饿) yourself.Eat plenty of low﹣sugar,high﹣energy food to keep your brain and body working their best.Be prepared.Make sure you have two pencils and anything else you were asked to bring.Watch the numbers.Make sure that the number of the items(项目) on your answer sheet matches the number of the question.Look over all the answer choices.Don't assume(假定) that choice A is correct untilyou've checked the others.You may find a better one.And it is wrong to eliminate(排除)any choice that you can see at once.You'll have a better chance of finding the right answer.Check the clock.Make sure you allow yourself enough time to answer every question and go back and check your answers.Don't spend too much time on any difficult question.Skip(跳读) it and come back to ________ later.Keep up with your schoolwork all year long.That's how you get the skills you need for taking a test.69.How many ways are mentioned in this passage?70.Why should you eat plenty of low﹣sugar,high﹣energy food on a test day?71.What should you take to prepare for a test?72.What do you do if you meet any difficult question?73.What's the passage mainly about?六、汉译英:单词/短语21. 完成句子根据中文意思完成句子。
门头沟区初三年级第二次统一练习数学试卷评分参考.doc
2013年门头沟区初三年级第二次统一练习数学试卷评分参考三、解答题(本题共30分,每小题5分)13114sin 45(3)4-⎛⎫︒+-π+ ⎪⎝⎭.解:114s i n 45(3)4-⎛⎫︒+-π+ ⎪⎝⎭=414+ ……………………………………………………………………4分=5. ……………………………………………………………………………5分14.解:由题意可知∆=0,即 (-6)2-4(m -3)=0. ………………………………………………2分解得m =12. ………………………………………………………………………………3分 当m =12时,原方程化为x 2-6x +9=0. …………………………………………………4分解得x 1=x 2=3. …………………………………………………………………………… 5分所以原方程的根为x 1=x 2=3.15.解:2222332x y y x x y x y x xy y --⋅+-++ =()()233()x y x y y xx y x y x y +--⋅+-+ ···························································· 2分 = 33x y x y x y-++ =33x yx y -+. ························································································· 3分 当13x y =时,3y x =. ················································································· 4分 ∴原式=393x x x x-+=32-. ·············································································· 5分16.证明:∵EF BE ⊥,90ABC ∠=°,∴90BEF ABC ∠=∠=°. ………………………………………………………1分 ∴90F EBF ∠+∠=°. 又∵BD AC ⊥,∴90EBF ACB ∠+∠=°.∴ACB F ∠=∠.………………………2分在ABC △和BEF △中,∴ABC △≌BEF △.……………………4分 ∴BC EF =.………………………………5分17.解:(1)∵ 点A (1, m )在一次函数y =3x 的图象上, ∴m =3. …………………………… 1分 ∴ 点A 的坐标为(1, 3).∵ 点A (1, 3)在反比例函数ky x=的图象上,∴ 3k =. ………………………………2分 ∴反比例函数的解析式为3y x=.3分 (2)点P 的坐标为P (3, 9) 或P (-1, -3) . ………………………………………5分18.解:设该校第二次有x 人捐款,则第一次有(x –50)人捐款. …………………………1分 根据题意,得90001200050x x =-. ……………………………………………………………3分解这个方程,得x =200. …………………………………………………………………4分 经检验,x =200是所列方程的解,并且符合实际问题的意义.答:该校第二次有200人捐款. …………………………………………………………5分四、解答题(本题共20分,每小题5分) 19.解:如图,过点D 作DF ⊥AC 于F .∵∠DAB =60º,AC 平分∠DAB , ∴∠DAC =∠BAC =30°. ∵BC AC ⊥,∴∠AFD =∠ACB =90°.∴116322DF AD ==⨯=,………………………………………………………………1分 BC = CE ⋅tan BEC ∠.………………………………………………2分 A BCDFEF EDC BAACB F ABC BEF AB BE ∠=∠⎧⎪∠=∠⎨⎪=⎩,,,∴3tan tan DF DF EF DEF BEC ===∠∠44tan tan 30BC AC BAC ====∠︒3分∴DE =…………………………………………4分∴ACD ACB ABCD S S S ∆∆=+四边形1122AC DF AC BC =⋅+⋅11422=⨯3+⨯= …………………………………………………………………………………………5分20.(1)证明:连结OD .∵AB 是⊙O 的直径,∴∠ADB=90°. ………………………………………………………………1分 ∵∠A=30°, ∴∠ABD=60°. ∵∠ABD=2∠BDC ,∴∠BDC =1302ABD ∠=︒.∵OD=OB ,∴△ODB 是等边三角形. ∴∠ODB=60°.∴∠ODC=∠ODB+∠BDC =90°.∴CD 是⊙O 的切线.…………………………………………………………… 2分(2)解: ∵OF ∥AD ,∠ADB=90°,∴OF ⊥BD ,∠BOE=∠A =30°. ………………………………………………3分 ∵BD=OB =2,∴112DE BE BD ===.∴OE = 4分 ∵OD=OB=2,∠DOC =60°,∠DOF=30°,∴tan 60CD OD =⋅︒=tan 30DF OD =⋅︒=.∴CF CD DF =-== ……………………………………5分21.解:(1)这次共调查了学生50人,E 组人数在这次调查中所占的百分比是8%.……2分 (2)表1中a 的值是15,………………………………………………………………3分补全图1. …………………………………………………………………………4分 (3)54人.……………………………………………………………………………5分22.解:(1)利用正方形网格在图3上画出矩形ABCD 的反射四边形EFGH . ……………2分(2)图2、图3中矩形ABCD 的反射四边形EFGH的周长是定值,定值是…3分 (3)图2、图3中矩形ABCD 的反射四边形EFGH 的面积不是定值,它们的面积分别是16、12……………………………………………………………………………5分五、解答题(本题共22分,第23、24题各7分,第25题8分)23.解:(1)∵拋物线224276883m m y x x m m --=-++-+经过原点,∴m 2-6m +8=0.解得m 1=2,m 2=4. 由题意知m ≠4,∴m =2.………………………………………………………………………………1分∴拋物线的解析式为x x y -=241. ………………………………………………2分(2)∵点B (-2,n )在拋物线x x y -=241上,∴n =3.………………………………………………………………………………3分∴B 点的坐标为(–2,3) .∵直线l 的解析式为2y x b =--,直线l 经过B 点, ∴()322b =---.∴1b =.……………………………………………………………………………4分(3)∵拋物线x x y -=241的对称轴为直线x =2,直线l 的解析式为y =-2x -1,∴拋物线x x y -=241的对称轴与x 轴的交点C 的坐标为(2,0),直线l 与y 轴、直线x =2的交点坐标分别为 D (0,-1)、E (2,-5). 过点B 作BG ⊥直线x =2于G ,与y 轴交于则BG =4.在Rt △BGC 中,5CB =. ∵CE =5,∴ CB =CE .过点E 作EH ⊥y 轴于H . 则点H 的坐标为 (0,-5).∵点F 、D 的坐标为F (0,3)、D (0,-1),∴FD =DH =4,BF =EH =2,∠BFD =∠EHD =∴△DFB ≌△DHE .∴DB =DE .∵PB =PE ,∴点P 在直线CD 上.∴符合条件的点P 是直线CD 设直线CD 的解析式为y =kx +a .将D (0,-1)、C (2,0)代入,得120a ,k a .=-⎧⎨+=⎩ 解得 112a ,k .=-⎧⎪⎨=⎪⎩∴ 直线CD 的解析式为112y x =-. ………………………………………………5分 设点P 的坐标为(x ,x x -241),∴112x -=x x -241. 解得 531+=x ,532-=x .∴2511+=y,2y ∴点P 的坐标为(53+,251+)或(53-,251-).…………………………7分24.解:(1)线段AD 与OM 之间的数量关系是AD =2OM ,位置关系是AD OM ⊥.………2分(2)(1)的两个结论仍然成立.证明:如图2,延长BO 到F ,使FO =BO ,连结CF .∵M 为BC 中点,O 为BF 中点,∴MO 为BCF ∆的中位线. ∴FC =2OM . ………………………………3分 ∵∠AOB =∠AOF =∠COD =90°, ∴∠AOD =∠FOC .∵AO =FO ,CO =DO ,∴△AOD ≌△FOC .∴FC =AD .∴AD =2OM . ………………………………………4分 ∵MO 为BCF ∆的中位线,∴MO ∥CF . ∴∠MOB =∠F .又∵AOD △≌FOC △,∴DAO ∠=F ∠. ∵MOB ∠+AOM ∠=90°, ∴DAO ∠+AOM ∠=90°.即AD OM ⊥. ……………………………………………………………………5分(3)(1)中线段AD 与OM 之间的数量关系没有发生变化. 证明:如图3,延长DC 交AB 于E ,连结ME ,过点E 作EN AD ⊥于N .∵OA =OB ,OC =OD ,︒=∠=∠90COD AOB , ∴45A D B BCE DCO ∠=∠=∠=∠=∠=︒. ∴AE =DE ,BE =CE ,∠AED =90°. ∴DN=AN . ∴AD =2NE .∵M 为BC 的中点,∴EM BC ⊥. ∴四边形ONEM 是矩形.FOMABCD 图2NA图3∴NE =OM .∴AD =2OM . ………………………………………………………………………7分25. 解:(1) 设直线AC 的解析式为.y kx b =+∵直线AC 经过G (0,6)、C (3,0)两点,∴6,30.b k b =⎧⎨+=⎩ 解这个方程组,得2,6.k b =-⎧⎨=⎩ …………………………………1分 ∴直线AC 的解析式为26y x =-+. ……………………………………………2分 (2) 当x =1时,y =4. ∴A (1,4).∵AP =CQ = t ,∴点P (1,4-t ).……………………………………………………………………3分 将y =4–t 代入26y x =-+中,得点E 的横坐标为x =12t+. ∴点E 到CD 的距离为22t -. ∴S △CQE =1222t t ⎛⎫⋅⋅- ⎪⎝⎭=214t t -+=()21214t .--+ ……………………………4分 ∴当t =2时,S △CQE 最大,最大值为1.……………………………………………5分 (3) 过点E 作FM ∥DC ,交AD 于F ,交BC 于M . 当点H 在点E 的下方时,连结CH . ∵4EM t =-,∴42HM t =-. ∵12t OM =+,∴22tCM =-.∵四边形CQEH 为菱形,∴CH CQ t ==.在Rt △HMC 中,由勾股定理得22CH HM =+∴()2224222t t t ⎛⎫=-+- ⎪⎝⎭. 整理得 21372800t t -+=.解得 12013t =,24t =(舍).∴当2013t =时,以C ,Q ,E ,H 为顶点的四边形是菱形. ……………………7分 当点H 在点E 的上方时,同理可得当20t =-. 以C ,Q ,E ,H 为顶点的四边形是菱形. ……………………………………………………………………8分∴t 的值是2013t =或20t =-。
2014门头沟区中考语文二模
2014门头沟区中考语文二模一、基础•运用.下列选择题均有四个选项,其中只有一个符合题意,请将所选答案的字母序号填写在答题纸中相应的表格内.(共24分.1-7题每小题2分,共14分;8题7分;9题3分)1.(2分)下列词语中加点字读音完全正确的一项是()A.庇.护(bì)逮.(dài)捕高屋建瓴.(línɡ)B.寒噤.(jìn)模.样(mó)谆.谆教诲(zhūn)C.翘.首(qiào)脑髓.(suǐ)中流砥.柱(dǐ)D.颓.唐(tuí)粗犷.(kuànɡ)随声附和.(hè)2.(2分)根据语境和所给字义,在下列句子横线处选填汉字,有误的一项是()A.李刚因家境贫寒,无法继续学业,正在一(愁、筹)莫展之时,学校团委派人送来了捐款.“愁”有“忧虑”的意思,“筹”有“计策、办法”的意思,横线处应填入“筹”B.“鱼与熊掌不可兼得”这句话告诉我们:事物之间是相互联系相互作用的,不可强求,一味追求两全(齐、其)美的结果可能是两手空空.“齐”有“一块、同时”的意思,“其”有时作代词,指代前面所说的情况,横线处应填“其”C.张敏和王宁的兴趣不同,学习方法不同,但(舒、殊)途同归,都取得了优异的成绩,令人敬佩.“舒”有“缓慢、从容”的意思,“殊”有“不同、差异”的意思,横线处应填“殊”D.欧阳修被贬滁州后,依然有纵情山水、与民同乐的闲情逸(至、致),足见他的乐观、豁达.“至”有“极、最”的意思,“致”有“情趣”的意思,横线处应填“至”.3.(2分)下列句子中加点成语或俗语使用无误的一项是()A.巴金先生经常深入到百姓生活之中,感受、体验他们的辛酸与快乐,所以才有脍炙人口....的作品流传于世B.门铃刚一响,我和妈妈便不期而遇....地站起来去开门C.镇元大仙回到观中,得知孙悟空推倒了人参果树,非常气愤,立即追捕唐僧师徒,真是初生牛犊不怕虎.......D.秋季运动会上,我们班团体总分排在全校最后一名,但是我们依然坚持体育锻炼,希望能青出于蓝而胜于蓝........4.(2分)依据语段内容,对画线病句的修改最恰当的一项是()这个景象使很多初来乍到的中国旅行者很受震动,原本总以为我们拥有历史,人家拥有现代,看来事情并不是这样,如果我们仅仅因历史过于厚重而失落了现代,这倒不是一个不难让人理解的理由,但厚重的历史保存在哪里呢,走到欧洲街道上东张西望,暗暗比较,方知我们在很大程度上是两头失落。
2014门头沟初三语文二模答案
门头沟区2014年初三二模考试试卷9.答案示例:①《朝花夕拾》②藤野先生③治学严谨、没有民族偏见的藤野先生(每空1分)二、文言文阅读(共10分)10.答案:(1)对(2)美丽(共2分。
共2空,每空1分)11.答案:(1)邹忌身高八尺多,形体容貌光艳美丽。
(2)我与城北的徐公相比,谁更美?(3)由此看来,大王受的蒙蔽很严重了。
(共6分。
共3句,每句2分)12.答案要点:有善于进谏的谋臣;齐威王虚心纳谏。
(共2分。
共2点,每点1分)三、现代文阅读(共36分)(一)《装穷的亿万富翁》(共16分)13.答案要点:①与丹尼斯母亲外出旅行并匿名向多家慈善机构捐款;②母亲:快乐并觉得麦克唐纳是一个朴素得伟大的人,并为此感到骄傲。
③上亿资产全部捐给慈善机构,且身后事一切从简。
(共6分。
共3点,每点2分) 14.答案要点:这句话体现了母亲说起与麦克唐纳在一起时,物质生活虽然简单,但是,她在内心却感到了无比的快乐。
母亲与麦克唐纳在一起,所做的事情,令她由衷地快乐。
她欣赏这个男人的风度和品行,而在内心有一种无比骄傲的感觉。
母亲的精神生活也因此更加充实。
(共3分。
“内容”1分;“理解”2分)15.答案示例:“这座金矿”,就是麦克唐纳身上的那种勤俭节约、无私而低调的美好品德。
拥有亿资产的他,过着比一般人更加节俭的生活,但是,从他多次匿名向多家慈善机构捐款一事,可以看出,他善良朴实的品性。
(“内容”2分;“理解”4分;“语言”1分) (二)(共10分)16.答案要点:历史悠久流行最广(共4分。
共2点,每点2分)17.答案:第一问:陈云的事例不但生动地表明了他对算盘的肯定和珍爱,而且深刻地表明他对发展珠算寄予殷切的期望。
第二问:珠算成功申遗有助于让更多的人认识珠算,了解珠算,增强民族自豪感,吸引更多的人加入到弘扬与保护珠算文化的行列中来。
(共6分。
共2问,每问3分)(三)《人生一世,为的是什么?》(共10分)18.答案要点:修炼自己,完善自身;有信仰,体现正确的价值观。
2014门头沟区中考数学二模
2014门头沟区中考数学二模一、选择题(本题共32分,每小题4分)1.(4分)﹣3的倒数是()A.3 B.﹣C.﹣3 D.2.(4分)门城湖公园位于门城湖畔,南至永定河管理处,北至城子东街,设计水体面积670000平方米,水体蓄水量160万立方米.请将670000用科学记数法表示()A.67×104B.6.7×105C.0.67×106 D.0.6×1063.(4分)窗花是我国的传统艺术,下列四个窗花图案中,不是轴对称图形的是()A.B.C.D.4.(4分)为了调查某班的学生每天使用零花钱的使用情况,张华随机调查了20名同学,结果如下表:则这20名同学每天使用的零花钱的平均数和中位数分别是()A.3,3 B.3,3.5 C.3.5,3.5 D.3.5,35.(4分)在九张形状、大小、质地等完全相同的卡片的一面分别标上数字1,2,3,4,5,6,7,8,9,将这九张卡片放到不透明的桌面上洗匀,且标有数字的一面向下,从中随机摸取一张卡片,则摸到卡片上标有的数字是2的整数倍的概率为()A.B.C.D.6.(4分)已知一扇形的圆心角是60°,扇形的半径为9,则这个扇形的弧长是()A.πB.2πC.3πD.4π7.(4分)如图,BD是⊙O的直径,∠A=60°,则∠DBC的度数是()A.30°B.45°C.60°D.25°8.(4分)如图,把左边的图形折叠起来,它会变为右面的哪幅立体图形()A.B.C.D.二、填空题(本题共16分,每小题4分)9.(4分)请写出一个对称轴为1,且开口朝上的二次函数关系式.10.(4分)分解因式:am2﹣6am+9a=.11.(4分)阳光通过窗口照射到室内,在地面上留下2.7m宽的亮区(如图所示),已知亮区到窗口下的墙脚距离EC=8.7m,窗口高AB=1.8m,则窗口底边离地面的高BC=m.12.(4分)我们知道,一元二次方程x2=﹣1没有实数根,即不存在一个实数的平方等于﹣1.若我们规定一个新数“i”,使其满足i2=﹣1(即方程x2=﹣1有一个根为i).并且进一步规定:一切实数可以与新数进行四则运算,且原有运算律和运算法则仍然成立,于是有i1=i,i2=﹣1,i3=i2•i=(﹣1)•i=﹣i,i4=(i2)2=(﹣1)2=1,从而对于任意正整数n,我们可以得到i4n+1=i4n•i=(i4)n•i=i,同理可得i4n+2=﹣1,i4n+3=﹣i,i4n=1.那么i+i2+i3+i4+…+i2012+i2013的值为.三、解答题(本题共30分,每小题5分)13.(5分)计算:(﹣)﹣1﹣|﹣3|﹣(3﹣π)0+2cos45°.14.(5分)解分式方程:15.(5分)已知,求的值.16.(5分)如图,ABCD是正方形,G是BC上的一点,DE⊥AG于E,BF⊥AG于F.(1)求证:△ABF≌△DAE;(2)求证:DE=EF+FB.17.(5分)如图,直线AB与y轴交于点A,与x轴交于点B,点A的纵坐标、点B的横坐标如图所示.(1)求直线AB的解析式;(2)点P在直线AB上,是否存在点P使得△AOP的面积为1,如果有请直接写出所有满足条件的点P的坐标.18.(5分)节能减排已经是全社会都在关注的问题,低碳出行是倡导的绿色理念.据调查从某地到北京,若乘飞机需要2小时,若乘汽车需要7小时.这两种交通工具平均每小时二氧化碳的排放量之和为65千克,飞机全程二氧化碳的排放总量比汽车全程二氧化碳的排放总量多40千克,求飞机和汽车平均每小时二氧化碳的排放量.四、解答题(本题共20分,每小题5分)19.(5分)如图,在平行四边形ABCD中,点E,F分别是AB,CD的中点.(1)求证:四边形AEFD是平行四边形;(2)若∠A=60°,AB=2AD=4,求BD的长.20.(5分)如图,线段BC切⊙O于点C,以AC为直径,连接AB交⊙O于点D,点E是BC的中点,交AB于点D,连结OB、DE交于点F.(1)求证:DE是⊙O的切线;(2)若AC=4,BC=,求的值.21.(5分)在结束了380课时初中阶段数学内容的教学后,唐老师计划安排60课时用于总复习,根据数学内容所占课时比例,绘制如下统计图表(图1~图3),请根据图表提供的信息,回答下列问题:(1)图1中“统计与概率”所在扇形的圆心角为度;(2)图2、3中的a=,b=;(3)在60课时的总复习中,唐老师应安排多少课时复习“数与代数”内容?22.(5分)阅读材料:小明在学习二次根式后,发现一些含根号的式子可以写成另一个式子的平方,如3+=(1+)2.善于思考的小明进行了以下探索:设a+b=(m+n)2(其中a、b、m、n均为整数),则有a+b=m2+2n2+2mn.∴a=m2+2n2,b=2mn.这样小明就找到了一种把类似a+b的式子化为平方式的方法.请你仿照小明的方法探索并解决下列问题:(1)当a、b、m、n均为正整数时,若a+b=,用含m、n的式子分别表示a、b,得:a=,b=;(2)利用所探索的结论,找一组正整数a、b、m、n填空:+ =(+ )2;(3)若a+4=,且a、m、n均为正整数,求a的值?五、解答题(本题共22分,第23题7分,第24题7分,第25题8分)23.(7分)已知二次函数y=﹣x2+2x+3图象的对称轴为直线.(1)请求出该函数图象的对称轴;(2)在坐标系内作出该函数的图象;(3)有一条直线过点P(1,5),若该直线与二次函数y=﹣x2+2x+3只有一个交点,请求出所有满足条件的直线的关系式.24.(7分)在△ABC中,AB=AC,分别以AB和AC为斜边,向△ABC的外侧作等腰直角三角形,M是BC边中点中点,连接MD和ME(1)如图1所示,若AB=AC,则MD和ME的数量关系是(2)如图2所示,若AB≠AC其他条件不变,则MD和ME具有怎样的数量和位置关系?请给出证明过程;(3)在任意△ABC中,仍分别以AB和AC为斜边,向△ABC的内侧作等腰直角三角形,M是BC的中点,连接MD 和ME,请在图3中补全图形,并直接判断△MED的形状.25.(8分)如图,抛物线y=﹣x2+bx+c与直线y=x+2交于C、D两点,其中点C在y轴上,点D的坐标为(3,).点P是y轴右侧的抛物线上一动点,过点P作PE⊥x轴于点E,交CD于点F.(1)求抛物线的解析式;(2)若点P的横坐标为m,当m为何值时,以O、C、P、F为顶点的四边形是平行四边形?请说明理由.(3)若存在点P,使∠PCF=45°,请直接写出相应的点P的坐标.参考答案与试题解析一、选择题(本题共32分,每小题4分)1.【解答】﹣3的倒数是﹣,故选:B.2.【解答】670 000=6.7×105.故选B.3.【解答】A、是轴对称图形,不符合题意;B、是轴对称图形,不符合题意;C、是轴对称图形,不符合题意;D、不是轴对称图形,找不到任何这样的一条直线使一个图形沿一条直线对折,直线两旁的部分能互相重合,符合题意;故选:D.4.【解答】这组数据按照从小到大的顺序排列为:1,2,2,2,3,3,3,3,3,3,4,4,4,4,4,5,5,5,5,5,则平均数为:=3.5,中位数为:=3.5.故选C.5.【解答】∵在九张形状、大小、质地等完全相同的卡片的一面分别标上数字1,2,3,4,5,6,7,8,9,从中随机摸取一张卡片,则摸到卡片上标有的数字是2的整数倍的有4种情况,∴从中随机摸取一张卡片,则摸到卡片上标有的数字是2的整数倍的概率为:.故选B.6.【解答】扇形的弧长是:=3π.故选:C.7.【解答】∵BD是⊙O的直径,∴∠BCD=90°,∵∠D=∠A=60°,∴∠DBC=90°﹣∠D=30°.故选A.8.【解答】圆面的临面是长方形,长方形不指向圆,故选;B.二、填空题(本题共16分,每小题4分)9.【解答】请写出一个对称轴为1,且开口朝上的二次函数关系式y=x2﹣2x,故答案为:y=x2﹣2x.10.【解答】am2﹣6am+9a=a(m2﹣6m+9)=a(m﹣3)2.故答案为:a(m﹣3)2.11.【解答】∵光线是平行的,即BD∥AE则有∵△BCD∽△ACE∴∴∴BC=412.【解答】∵i4n+1=i,i4n+2=﹣1,i4n+3=﹣i,i4n=1,∴i+i2+i3+i4+…+i2012+i2013=503(i﹣1﹣i+1)+i2012•i=1•i=i.故答案为:i.三、解答题(本题共30分,每小题5分)13.【解答】原式=﹣4﹣3﹣1+,=﹣8+.故答案为:﹣8+.14.【解答】分母因式分解,得,方程两边同乘(x+1)(x﹣1),得x(x﹣1)﹣6=(x+1)(x﹣1),解得x=﹣5.检验:当x=﹣5时,(x+1)(x﹣1)≠0.∴x=﹣5是原分式方程的解.15.【解答】原式=•+=+=.当=时,y=3x,原式==﹣4.16.【解答】证明:(1)∵DE⊥AG,BF⊥AG,∴∠AED=∠AFB=90°.(1分)∵ABCD是正方形,DE⊥AG,∴∠BAF+∠DAE=90°,∠ADE+∠DAE=90°.∴∠BAF=∠ADE.(2分)又在正方形ABCD中,AB=AD,(3分)在△ABF与△DAE中,∠AFB=∠DEA=90°,∠BAF=∠ADE,AB=DA,∴△ABF≌△DAE.(5分)(2)∵△ABF≌△DAE,∴AE=BF,DE=AF.(6分)又AF=AE+EF,∴AF=EF+FB.∴DE=EF+FB.(7分)17.【解答】(1)根据题意得,A(0,2),B(4,0),设直线AB的解析式为y=kx+b(k≠0),则,∴,∴直线AB的解析式为y=﹣x+2;(2)设P横坐标为a,根据题意得:S△AOP=OP•|a|=|a|=1,解得:a=1或a=﹣1,则P坐标为(1,1.5)或(﹣1,2.5).18.【解答】设飞机和坐汽车每小时的二氧化碳排放量分别是x千克和y千克,根据题意,得:,解得:.答:飞机和汽车每小时的二氧化碳排放量分别是55千克和10千克.四、解答题(本题共20分,每小题5分)19.【解答】(1)证明:如图.∵四边形ABCD是平行四边形,∴AB∥CD且AB=CD,∵点E,F分别是AB,CD的中点,∴AE=AB,DF=CD.∴AE=DF,∴四边形AEFD是平行四边形;(2)解:过点D作DG⊥AB于点G.∵AB=2AD=4,∴AD=2.在Rt△AGD中,∵∠AGD=90°,∠A=60°,AD=2,∴AG=AD•cos60°=1,DG=AD•sin60°=.∴BG=AB﹣AG=3.在Rt△DGB中,∵∠DGB=90°,DG=,BG=3,∴DB===2.20.【解答】(1)证明:连结OD、CD,如图.∵AC是⊙O直径,∴∠ADC=∠BDC=90°.∵点E是BC的中点,∴DE=BE=EC.∵OA=OD,DE=BE,∴∠ADO=∠A,∠DBE=∠BDE.∵∠DBE+∠A=90°,∴∠BDE+∠ADO=90°.∴∠EDO=90°,∴OD⊥DE,即DE是⊙O的切线;(2)解:连结OE.则OE∥AB,OE=AB,∴△OEF∽△BDF,∴=.∵BC切⊙O于点C,∴∠ACB=90°.在Rt△ABC中,AC=4,BC=,根据勾股定理得,AB=8,∴OE=4,∵∠A=60°,∴△AOD是边长为2的等边三角形,∴AD=2,BD=AB﹣AD=6,∴.21.【解答】(1)(1﹣45%﹣5%﹣40%)×360°=36°;(2)380×45%﹣67﹣44=60;60﹣18﹣13﹣12﹣3=14;(3)依题意,得45%×60=27,答:唐老师应安排27课时复习“数与代数”内容.故答案为:36,60,14.22.【解答】(1)∵a+b=,∴a+b=m2+3n2+2mn,∴a=m2+3n2,b=2mn.故答案为:m2+3n2,2mn.(2)设m=1,n=1,∴a=m2+3n2=4,b=2mn=2.故答案为4、2、1、1.(3)由题意,得:a=m2+3n2,b=2mn∵4=2mn,且m、n为正整数,∴m=2,n=1或者m=1,n=2,∴a=22+3×12=7,或a=12+3×22=13.五、解答题(本题共22分,第23题7分,第24题7分,第25题8分)23.【解答】(1);(2)图象(3)因为抛物线的对称轴是x=1,点p(1,5)当过点p且与y轴平行的直线满足与抛物线只有一个交点所以直线x=1为所求直线当过点p的直线不与y轴平行时,设直线的解析式为y=kx+b,令﹣x2+2x+3=kx+b整理得﹣x2+(2﹣k)x+3﹣b=0由题意得△=(2﹣k)2+4(3﹣b)=0即:k2﹣4k+16﹣4b=0又因为y=kx+b,过点p(1,5)所以5=k+b所以k2﹣4=0解得k=±2,当k=2时,b=3;当k=﹣2时,b=7所以解析式为y1=2x+3,y2=﹣2x+7,所以满足条件的直线有三条:直线x=1;y1=2x+3,y2=﹣2x+7.24.【解答】(1)MD=ME.解:∵△ADB和△AEC是等腰直角三角形,∴∠ABD=∠DAB=∠ACE=∠EAC=45°,∠ADB=∠AEC=90°在△ADB和△AEC中,,∴△ADB≌△AEC(AAS),∴BD=CE,AD=AE,∵M是BC的中点,∴BM=CM.∵AB=AC,∴∠ABC=∠ACB,∴∠ABC+∠ABD=∠ACB+∠ACE,即∠DBM=∠ECM.在△DBM和△ECM中,∴△DBM≌△ECM(SAS),∴MD=ME.(2)如图,作DF⊥AB,EG⊥AC,垂足分别为F、G.因为DF、EG分别是等腰直角三角形ABD和等腰直角三角形ACE斜边上的高,所以F、G分别是AB、AC的中点.又∵M是BC的中点,所以MF、MG是△ABC的中位线.∴,,MF∥AC,MG∥AB.∴∠BFM=∠BAC,∠MGC=∠BAC.∴∠BFM=∠MGC.所以∠DFM=∠MGE.∵DF、EG分别是直角三角形ABD和直角三角形ACE斜边上的中线,∴,.∴MF=EG,DF=MG.在△DFM与△MGE中,,∴△DFM≌△MGE(SAS).∴DM=ME.∠FMD=∠GEM∴∠DME=∠FMD+∠FMG+∠GME=∠GEM+∠MGC+∠GME∵EG⊥AC∴∠EGC=90°∵∠GEM+∠MGC+∠GME+∠EGC=180°∴∠DME=90°∴DM⊥EM.(3)如图所示:△MDE是等腰直角三角形.25.【解答】(1)在直线解析式y=x+2中,令x=0,得y=2,∴C(0,2).∵点C(0,2)、D(3,)在抛物线y=﹣x2+bx+c上,∴,解得b=,c=2,∴抛物线的解析式为:y=﹣x2+x+2.(2)∵PF∥OC,且以O、C、P、F为顶点的四边形是平行四边形,∴PF=OC=2,∴将直线y=x+2沿y轴向上、下平移2个单位之后得到的直线,与抛物线y轴右侧的交点,即为所求之交点.由答图1可以直观地看出,这样的交点有3个.将直线y=x+2沿y轴向上平移2个单位,得到直线y=x+4,联立,解得x1=1,x2=2,∴m1=1,m2=2;将直线y=x+2沿y轴向下平移2个单位,得到直线y=x,联立,解得x3=,x4=(在y轴左侧,不合题意,舍去),∴m3=.∴当m为值为1,2或时,以O、C、P、F为顶点的四边形是平行四边形.(3)存在.理由:设点P的横坐标为m,则P(m,﹣m2+m+2),F(m,m+2).如答图2所示,过点C作CM⊥PE于点M,则CM=m,EM=2,∴FM=y F﹣EM=m,∴tan∠CFM=2.在Rt△CFM中,由勾股定理得:CF=m.过点P作PN⊥CD于点N,则PN=FN•tan∠PFN=FN•tan∠CFM=2FN.∵∠PCF=45°,∴PN=CN,而PN=2FN,∴FN=CF=m,PN=2FN=m,在Rt△PFN中,由勾股定理得:PF==m.∵PF=y P﹣y F=(﹣m2+m+2)﹣(m+2)=﹣m2+3m,∴﹣m2+3m=m,整理得:m2﹣m=0,解得m=0(舍去)或m=,∴P(,);同理求得,另一点为P(,).∴符合条件的点P的坐标为(,)或(,).。
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水中倒影A日食形成B小孔成像C铅笔“折断”D图12014年北京市门头沟区初三第二次统一练习一、单项选择题:(下列各小题均有四个选项,其中只有一个选项符合题意。
共28分,每小题2分)1.通常情况下,下列物品中属于绝缘体的是 A.永定河里的河水 B.干电池里的碳棒 C.钢丝钳把手上的塑料套D.导线中的铜丝2.在颐和园的昆明湖上,小红同学坐在航行的游艇内,若说她是静止的,则所选择的参照物是A.湖岸B.游艇湖水 D.岸边的树3.图1所示的现象中,属于光的反射现象的是4.图2所示的四种工具中,属于省力杠杆的是5.下列关于温度、热量和内能变化的说法中,正确的是A.物体温度升高,它的内能一定增加B.物体温度升高,一定是外界对物体做功C.物体温度不变,它的内能一定不变D.物体温度降低,一定是物体放出了热量图2天平镊子钓鱼竿撬棒A B CD图5A举重运动员 举着杠铃不动C小丽用力搬起箱子 D小静背着 书包在等车B 大力士支撑着 大轮胎静止不动6.下列现象中,不能..说明分子处在永不停息的无规则运动中的是 A.花开时香气扑鼻 B.扫地时尘土飞扬C.红墨水在水中散开D.衣柜里的樟脑丸过一段时间变小了 7.图3所示的四个实例中,目的是为了减小压强的是8.图4所示的四个情景中,其物态变化过程需要吸热的是9.如图5所示的四种情景中,人对物体做功的是10.下列说法中正确的是A.接入同一电路中的两个导体电阻大小不相等,则通过它们的电流也不相等B.带有异种电荷的两个小球互相靠近,会互相排斥C.电动自行车在给蓄电池充电时,是将化学能转化为电能D.原子弹和氢弹爆炸时,释放的都是核能11. 下列选项是对质量和长度的估测,其中最接近实际的是 A.一个鸡蛋的质量约为500g B.一位中学生身高约为1.6mC.一块橡皮的质量约为10kgD.一支未用过的2B 铅笔的长度约为15mmA.冬天户外的人呼B.湿裤子C.冬天窗玻璃上D.钢水浇铸得 出“白气” 晾干 有冰花 到钢件图4图3注射器针头做得很尖 A 用很细的钢丝切肥皂B 用刀切苹果 C载重汽车装有很多轮子D12.图6甲所示为一台电压力锅,它结合了高压锅和电饭锅的优点,省时省电、安全性高。
当电压力锅内部气压过大或温度过高时,发热器都会停止工作。
图6乙中S 1为过压保护开关,S 2为过热保护开关,压强过大时开关S 1自动断开,温度过高时开关S 2自动断开。
图6乙表示S 1、S 2和锅内发热器的连接情况,其中符合上述工作要求的是13.图7所示电路中,电源电压恒定。
断开S 1、S 3,闭合S 2,两电表均有示数;再断开S 2,闭合S 1、S 3,此时两电表的示数与前者相比 A.两表示数均变大 B.两表示数均变小C.电流表示数变大,电压表示数变小D.电流表示数变小,电压表示数变大14.图8所示,质地均匀的圆柱体甲和装有液体乙的圆柱体容器放置在水平地面上,甲、乙的质量相等。
现沿水平方向截去部分甲,并从容器中抽取部分乙后,甲对地面的压强小于乙对容器底部的压强。
若甲、乙剩余部分的体积分别是V 甲、V 乙,则下列说法正确的是A.V 甲可能等于V 乙B.V 甲可能大于V 乙C.V 甲一定小于V 乙D.V 甲一定大于V 乙二、多项选择题(下列各小题均有四个选项,其中符合题意的选项均多于一个。
共12分,每小题3分。
每小题选项全选对的得3分,选对但不全的得2分,有错选的不得分) 15.关于声现象,下列说法中正确的是 A.声音的传播需要介质,真空可以传声B.公路旁安装隔音墙是为了在传播路径上减弱噪声C.“闻其声而知其人”主要是根据音色来判断的D.用大小不同的力先后敲击同一音叉,音叉发声的音调会不同图8图7A B C D 图6甲 乙16.关于电磁现象,下列说法中正确的是A.丹麦科学家奥斯特首先发现电流周围存在磁场B.发电机和电动机都是利用电流的磁效应来工作的C.磁体外部的磁感线都是从磁体的北极出发,最后回到南极D.通电螺线管的磁极与线圈中的电流大小和线圈的绕法有关 17.下列说法中正确的是A.20℃的水一定比80℃的水含有的热量少B.酒精灯内的酒精用去一半后,酒精的热值不变C.发生沙尘暴时,沙尘漫天浮动,这种现象说明分子在永不停息地做无规则运动D.用锯条锯木板,锯条的温度升高,是用做功的方式增大了锯条的内能 18.下列说法中正确的是A.同一直线上两个力的合力,可能小于其中一个分力B.放在水平桌面上的物体,物体对桌面的压力与物体所受重力是一对平衡力C.做匀速直线运动的物体,速度越大,所受到的力越大D.若物体不受力,则其运动状态一定不发生改变 三、填空题(每空2分,共12分) 19. 的定向移动形成电流。
20.小红站在平面镜前2m 处,小红在平面镜中的像到镜面的距离是 m 。
21.潜水艇是靠改变 实现上浮和下沉的。
22.我们可以把一次能源分为可再生能源和不可再生能源,其中石油属于 能源。
23.把一个标有“220V 1500W”的电热水壶接在电源上使其正常工作,通电5min 后水沸腾,电热水壶自动断电,该电热水壶消耗的电能为__________J 。
(不考虑加热过程中的损耗) 24.一根均匀的木棍长度为L ,密度为ρ1。
下端挂一个质量为m 的小金属块后,能如图9所示漂浮在密度为ρ2的液体中。
此时木棍露出液面的长度为h 。
用剪刀剪掉长度为L '= 的木棍,剩余的木棍和金属块恰能悬浮在原来的液体中。
四、实验与探究题(25题~32题、34题、36题各2分, 33、37题各3分, 35题4分, 38题5分,共35分)25.根据入射光和折射光的方向,在图10的方框中画出适当的透镜图9O图16图120 1 6 4 8图11图13图1026.图11所示电能表的示数为____________kW h 。
27.图12中电压表的示数是 V 。
28.图13是某同学测体温时的示数,其示数为 ºC 。
29.在“探究平面镜成像特点” 的实验中,某同学用玻璃板、相同的两个棋子A 和B 、刻度尺、白纸、橡皮泥等器材进行实验,如图14所示。
(1)实验中调整好A 和B 的位置后,使用刻度尺分别测量A 和B 到平面镜的距离,可得到像到平面镜的距离 物到平面镜的距离;(填“>”、“=”或“<”);(2)移开棋子B ,用白纸做屏幕放在该位置,白纸上接收不到A 的像,说明平面镜成的是_______像。
(填“虚”或“实”)。
30.如图15所示,木板上有两条长度与横截面积均相等的金属丝。
AB 是镍铬合金丝,CD 是锰铜丝。
将两根金属丝分别接入电路,通过观察比较电流表示数的大小,从而得出相对应的结论。
那么这个实验装置探究的问题是 。
31.如图16所示的均匀杠杆,刻度线之间的距离都是相等的。
)实验前,应先调节杠杆两端的螺母,使杠杆在水平位置平衡,目的是 ;使杠杆在位置平衡后,在杠杆的A 刻线处挂3个钩码,为了使杠杆在水平位置重新平衡,应该在B 刻线处挂________个钩码。
图15甲 乙图17图1932.小强用实验探究液体内部的压强与深度的关系及与液体密度的关系。
他分别在甲、乙玻璃杯中装入适量的水,当把压强计探头放入水中的深度为h 1时,压强计的两液面高度差如图17甲所示;当把压强计的探头放入水中的深度为h 2时,压强计的液面高度差如图17乙所示。
比较h 1和h 2可知: 。
33.如图18是某物质熔化时温度随时间变化的图像,由图像所给信息可以判断该物质的熔点是 ℃,该物质的熔化过程经历的时间为 min ,在这段时间内物体的内能 (选填“增加”、“减小”或“不变”)。
34.在图19中,凸透镜焦距为12cm ,当蜡烛在 20cm 刻度处时,在光屏上能成清晰的、倒立的、 (选填“放大”或“缩小”)的实像;保持透镜位置不变,当蜡烛在46cm 刻“能”或“不能”)。
35.如图20甲所示,是用电压表和电流表测3.8V 小灯泡正常发光时电阻的实验电路。
(1)闭合开关前,应将滑动变阻器的滑片P 移动到 端。
(选填“左”或“右”) (2)闭合开关,移动滑动变阻器的滑片P ,使 ,此时小灯泡正常发光,电流表示数如图20乙所示为 A ,则灯泡正常发光时的电阻是 Ω。
。
图20乙-+图2136.实验小组的同学用图21所示的电路,探究串联电路中定值电阻两端的电压的变化量(ΔU 1)随通过定值电阻电流的变化量(ΔI )的变化规律,他们分别通过调节滑动变阻器,测出了滑片P 在不同位置时电流表A 、电压表V 1的示数,并将数据记录在表中。
请你根据表中的实验数据,总结出串联电路中定值电阻两端的电压变化量的绝对值(|ΔU 1|)随通过定值电阻电流变化量的绝对值(|ΔI |)的变化规律的表达式为 。
37.小洁利用天平(含砝码)、刻度尺、烧杯(无刻度)、适量的水、足量的牛奶,测量牛奶的密度。
以下是小洁设计的实验步骤,请你按照他的实验思路,将实验步骤补充完整。
(1)用调节好的天平,测出空烧杯的质量m 0;(2)将适量的水倒入烧杯中,用天平测出烧杯和水的总质量m 1,用刻度尺量出水面达到的高度h ;(3)将水倒出,在烧杯中倒入牛奶, ,用天平测出烧杯和牛奶的总质量m 2; (4)已知水的密度为ρ水,利用测量出的物理量和ρ水计算牛奶的密度ρ = ,并将计算结果记录在表格中。
38.实验桌上有如下器材:弹簧测力计、带有溢水口的溢水杯、适量的水、满足实验要求的小桶、体积不同的金属块6个、细线若干。
请你选用上述实验器材设计一个实验证明:物体所受浮力的大小等于物体排开液体所受的重力。
请你写出实验步骤,画出实验数据记录表格。
五、计算题(39题6分,40题7分,共13分)39.张明得到一个旧电热暖手器,铭牌上表示额定值的字样中,能看清的只有“18W”这几个字,为了能安全地使用这个电热暖手器,他找来一只标有“1028Ω 0.4A”字样的电阻.将它与电热暖手器和开关串联起来接到家庭电路中,然后进行如下的实验和观察:将开关接通后,电能表在5分钟内恰好转动411转;断开开关后,电能表在3分钟内恰好转动240转。
已知他家电能表上标着“3000R/kW⋅h”.。
(假定在张明做实验的时间内,家中其它用电器用电情况没有变化,且电热暖手器和电阻的阻值都不随温度变化)求:⑴除做实验的支路外,张明家3分钟用电多少kW⋅h;⑵电热暖手器和电阻支路的电功率是多少;⑶电热暖手器的额定电压是多少。
40.图22甲是利用滑轮组打捞水中物体的简化模型示意图,图中虚线框里是滑轮组(未画出),工人师傅用该装置从水中打捞物体A。
当物体A在水中以0.3m/s的速度匀速上升时,工人师傅对滑轮组绳子自由端的拉力为F1,此时地面对工人师傅的支持力为N1,滑轮组的机械效率为η1;当物体A完全露出水面以0.1m/s的速度匀速上升时,工人师傅对滑轮组绳子自由端的拉力为F2,此时地面对工人师傅的支持力为N2,滑轮组的机械效率η2为80%。