2013.1大兴九年级第一学期期末试题及答案

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北京市大兴区九年级(上)期末英语试卷(含答案)

北京市大兴区九年级(上)期末英语试卷(含答案)

九年级(上)期末英语试卷一、单选题(本大题共10小题,共10.0分)1.I usually set ______goals at the beginning of each term.()A. IB. meC. myD. mine2.-Are you familiar _______the movie,Melissa?-Yes,I've watched it twice.()A. forB. withC. ofD. at3.________it is raining heavily,we have to stay indoors at school.()A. As soon asB. SinceC. ThoughD. Unless4.An e-book is usually much______ than an ordinary paper book.()A. more expensiveB. the most expensiveC. most expensiveD. expensive5.-Eric,_____you talk about the history of China's space programme?-Sure.Let me show you some photos first.()A. mustB. needC. mayD. can6.Look!Betty and Bruce _________in the art room.()A. are paintingB. will paintC. have paintedD. painted7.If you _______up late,you will feel tired the next day.()A. will stayB. have stayedC. stayD. were staying8.Mr.King asks us _______ a car with our friends to school.()A. organizingB. organizedC. organizeD. to organize9.The lights in my room _______off when I left yesterday morning.()A. turnB. turnedC. are turnedD. were turned10.-Do you know ______________ at that time last night?-Yes,a report for a newspaper.()A. what was Linda writingB. what will Linda writeC. what Linda was writingD. what Linda will write二、完形填空(本大题共10小题,共15.0分)Maddy Cullen became a heroine last month.Thanks to her quick thinking,she and Dave Lewis were saved from danger in the(31)______.Maddy and Dave went to the Scottish Highlands with a group from the Music Now Festival.In the afternoon,the group went(32)______on the lake,but Maddy and Dave went hang-glider (滑翔)instead.Unfortunately,above the famous lake Loch Ness,the hang-glider flew into a sudden storm and knocked on a mountain out of(33)______.Both Maddy and Dave jumped off the hang-glider before it crashed down(坠毁).They dropped safely in the mountains.But Dave couldn't walk because his right leg was badly injured.He and Maddy had to stay in the mountains and waited for rescuers.They had no food or water,so they were hungry,thirsty and(34)______.They felt very worried before the sun set.Then Maddy had a very good idea.She collected many stones and formed a large sign"SOS"on the ground so that pilots in the helicopter could find them(35)______.Meanwhile,group leader Rob Townsend was also worried when he found Maddy and Dave didn't sail with them.There were no public(36)______anywhere nearby.He had to walk a long way to call the police to look for the missing teenagers.A few minutes later,a policehelicopter flew over Loch Ness,and the pilot saw Maddy's message from above easily.Dave and Maddy were(37)______ up and flown to hospital in Inverness quickly.A week ago,Maddy spoke to a reporter from the newspaper."We were very(38)______when the helicopter arrived,"she said."The police told Dave not to move and they carried him into the helicopter.They asked us to put on dry clothes and(39)______ some hot soup to us.They were great.""It was all because of me,"Dave said."Rob told us to wear walking boots,and he told us not to leave the group.But I did not listen.I was very silly."The police(40)______.On its radio news,they asked walkers in the Highlands to follow instructions carefully and not to take any adventures.11. A. forest B. sea C. mountains D. lake12. A. sailing B. fishing C. skating D. swimming13. A. sight B. trouble C. control D. date14. A. alone B. sad C. calm D. cold15. A. silently B. easily C. simply D. carefully16. A. telephones B. libraries C. websites D. bicycles17. A. given B. put C. woken D. picked18. A. excited B. confused C. frustrated D. scared19. A. shared B. offered C. cooked D. provided20. A. insisted B. agreed C. considered D. suggested.三、阅读理解(本大题共15小题,共30.0分)AA. New YorkB. BeijingC. TorontoD. Moscow22.How long does the play last?______A. An hour.B. One and a half hours.C. Two hours.D. Two and a half hours.23.What can be known from the play?______A. The types of ancient houses.B. Chinese traditional festivals.C. Chinese history and culture.D. The art of Chinese painting.BDo you want to spend a holiday in space?Dennis Tito,a businessman,has become the world's first"space tourist".He went on a 10-day visit to the International Space Station.He paid 14million pounds for his journey.A year later,Martin,a musician from an American band,wanted to do the same.He was only 22years old and probably very rich too.He had to go for a lot of training to see whether he was fit enough to travel.He is still waiting for his holiday of a lifetime.Many people believe that this is only the start of something new.We made interviews among teenagers from around the world and the following is what they said about space travel."It's a great idea.I hope space travel will be common in about 50years'time.I'd really love to do it and I think Mr.Tito was very lucky."(Kate from Australia)"I would like to see our beautiful Earth from space.There are lots of secrets to explore in space and I would go into space if I could."(Ben from China)"I think space travel is really bad for the environment.Maybe in the future they will make a cleaner way of travelling but until they do,I don't want to go.We should look after our own planet first."(Richard from Canada)"It must be very boring and dangerous to sit in that small space shuttle(舱).I'd rather take a plane and go to another place on earth."(Lisa from the UK)So,as you can see,many of our teenagers had different opinions.Whether you like it or not,space travel is going to become an important thing in the future.We are looking forward to hearing your opinions.24.What can we know about Dennis and Martin?______A. Dennis spent a lot of money travelling on the earth.B. Martin was a musician from an American band.C. Martin couldn't afford to go on training in the center.D. Dennis is developing a space journey to do business.25.Ben supports the position that______.A. we will explore in space and discover its secretsB. we would rather travel on the earth than in spaceC. all of us can make a space travel in about 50yearsD. we will take actions and look after the earth first26.What does the writer ask us to do?______A. To show respect for Dennis and Martin.B. To collect information about astronauts.C. To share our opinions about space travel.D. To get along well with space scientists.27.Which of the following is TRUE according to the passage?______A. It's an honor for Dennis and his teammates to create a new spaceship.B. The teenagers are having a prediction about the school life in the future.C. Dennis entered the International Space Station and stayed for ten days.D. Martin is busy training hard and getting ready for his space travel now.CSarasota,Florida teen band The Garbage-Men is performing on the stage.The band has five members.They are Jack Berry,Ollie Gray,Harrison Paparatto,Austin Siegel and Evan Tucker.The five teens are making music from waste.The Garbage-Men band's instruments are made from recycled things.The guitars are boxes.A horn(号)is made from pipes.The keyboard is formed from old bottles.The band started about two years ago.Jack Berry who was in eighth grade at the time decided to make a playable,home-made guitar,after some trial-and-error(反复试验),he ended up building it from a cereal box,a yardstick and toothpicks.After Jack showed his creation to his friend Ollie Gray,Ollie had the idea to form a band using other home-made instruments as a way to improve recycling."We want to show people there is more to recycling than throwing things away in the bin."Jack,16,told TFK."You can actually reuse materials."The Garbage-Men plays at local events around Sarasota,including festivals,farmer's markets and community fundraisers.Typically,the teens will set up on the street and perform popular songs from the 1960s,including classic Beatles tunes and crowd favorite"Wipe Out,"by The Surfaris.In between sets,they talk about recycling and offer tips for how to help the environment.While they perform,Jack's little brother Trent,11,gives out flyers(宣传单)about recycling and helps sell the band's CDs and other musical products.The band donates(捐赠)the money from sales to charity.They have raised more than $2,500for Heifer International.The organization gives farm animals,seeds and agricultural(农业的)training to people in poor countries to help end poverty and hunger."It's a good,sustainable-development (持续发展的)charity,"Jack says,"By donating one animal,you help the whole community."The band,all tenth graders,tries to play a show every week.They've also played on a Tampa,Florida radio station and auditioned(试演)for America's Got Talent.The teens hope to eventually take their shows on the road by touring in other states."Music is a really good way to get a good message across to people because it's really accessible(可接近的),"Jack says.Their instruments may be rubbish,but their message isn't.28.Who is NOT a member of the Garbage-Men band?______A. Ollie Gray.B. Trent Berry.C. Austin Siegel.D. Jack Berry.29.The five teens formed the band in order to______.A. show how to make musical instruments from rubbishB. earn more money to help support their own familiesC. make their musical products known all around the worldD. ask more people to recycle daily rubbish around them30.What did the Garbage Men Band mainly do according to the passage?______A. They told people how to protect the environment and do some charities.B. They collected the rubbish in communities and cleaned up the markets.C. They raised money for the old people by selling their own instruments.D. They joined the Heifer International and made their own musical CDs.31.What's the best title for the passage?______A. Music and EnvironmentB. The Garbage-Men BandC. Home-made Musical InstrumentsD. A Pioneer of American Country Music.DAccording to a new scientific research,we are rapidly going close to major climate change and the effects on the environment could be quite serious.Geographers predict that climate zones could completely disappear within the next eighty years.Where will crops be grown if this happens?When the climate changes a lot,polar regions will get colder and tropical regions will get even hotter.As a result,where will animals be forced to move on the earth?Climate changes like these could lead to the spread of diseases.Tropical storms and hurricanes (飓风)will not only increase but may also become stronger.If the changes come too quickly,animals and plants may not be able to adapt(适应)right away and could disappear from the earth.According to Science Daily,a new study predicts that,by the year 2100,many of today's familiar climates will be taken place by climate unknown in today's world.It is urgent that we reduce the risks of far-reaching results for the whole world.The planet itself has been showing signs of change.In 2004,a huge tsunami created by a major earthquake killed thousands in Sumatra and in 2008,thousands more died in China in another big earthquake.Egypt was hit in 2009with a major earthquake and Haiti was destroyed seriously and became ruins in 2010by another big earthquake.Not long ago,scientists discovered ice melting(融化)in west Antarctica(南极洲).This is very worrying because temperatures in this area have remained rather constant(不断的)and actually even lower at time.Melting occurs when temperatures increase and since temperatures have remained,the ice should not be melting.However,satellite data(数据)shows melting around west Antarctica.Within just the last few months,new reports from around the world have been coming in and most agree that our climate situation is much worse than previously expected.At this point,it doesn't matter what is causing it,but rather,what can be done about it.On the other hand,our world is getting more and more unstable(不稳定)every year.Natural disasters(灾难)are becoming more frequent(频繁的)and serious.However,other planets are experiencing global warming as well as our own and some scientists believe there may be some connections between these.No one knows anything for sure at this point because there is simply not enough data.32.What's the writer's attitude toward the climate changes?______A. We should observe the great changes of the climate carefully.B. We must connect with other planets to prevent the climate changes.C. We should try our best to do something against the climate changes.D. We need to discover what causes the climate changes first of all.33.What does the underlined word"tropical"mean?______A. cold and dryB. cool and wetC. hot and wetD. warm and dry34.What can be inferred from the passage?______A. Collecting more data will help us to solve the problem.B. The climate will be much better than we have expected.C. Earthquakes can be avoided in a few years'time.D. The ice in west Antarctica will stop melting in the future.35.What's the passage mainly about?______A. It tells us how to protect the environment of the earth.B. It talks about the bad effects of the climate changes.C. It shows us how to prevent diseases from spreading.D. It describes what we should do with the earthquakes.四、阅读填空(本大题共1小题,共10.0分)36.On June 26th,2000,two scientists,called Francis Collins and Craig Venter,told the world that they could now read the whole"map"of the human body:DNA.DNA is something that all humans have,and it tells the body what to do.DNA is the reason that we look like our mother and fat her,because we get some of their DNA to make our own.Now we can read some of this"m ap",and so we can find out more about how our bodies work.People have been trying to understand the human body for a long time.In 1860,Gregory Mendel discovered that there is a special reason why we look the same as other people in our family.It is because of small things called"genes"that we have in our bod y.In 1953,James Watson and Francis Crick made another discovery and found out that those small parts are really messages written in the DNA with a special language.In 1961,Marshall Nirenberg and Johann Matthaei found the first"word"that they could understand in that language,showing how DNA tells the cell to build its parts.This meant that one day we would be able to read all the messages that a human body gets from its parents'bodies.Scientists have now found all the words in DNA map,but we still do not understand what they all do.By understanding what just one"word"means,we can help save people from several diseases.So the more we understand,the more doctors will be able to do.Most people hope that this will help to make better medicine and help people who are ve ry ill.Other people worry about that when we learn more words and find out lots of oth er information,we still use it in the wrong way,just to make people more attractive,or stop sick people getting jobs.61.Could Francis and Craig read the"map"of DNA in 2000?______62.Why do we look like our parents?______63.When was the first"word"of DNA discovered?______64.What can the doctors do if we understand some messages in DNA?______65.What does the writer tell us in the last paragraph?______.五、完成句子(本大题共1小题,共10.0分)37.Planes have changed the world in the last hundred years.But this great change began withtwo ordinary people.Orville and Wilbur Wright were two brothers.(56)______.They were good at making bicycles,but planes were their real interest.At that time,people knew how to build and fly gliders.But nobody could build a plane with an engine and fly it.The plane builders had two main problems:(57)______.And the planes always crashed when they tried to take off.The Wright brothers read about these problems in newspaper,and they decided to look for answers.They made small model planes in the bicycle shop and they built a wind tunnel (风道)to test the models.They also built real gliders.(58)______.On December17th,1903,Orville and Wilbur pulled The Flyer onto a flat sandybeach.The plane weighted 275kilograms.It had a petrol engine and two woodenpropellers(螺旋桨).Two bicycle chains connected the propellers to the engine.(59)______.The brothers threw a coin into the air to see who should fly first.Orville won.He climbed onto the plane and started the engine.(60)______.Wilbur ran along beside the plane.And then the plane took off!It flew for六、书面表达(本大题共1小题,共15.0分)38.假如你叫李华,你的笔友Peter想了解你日常生活中的榜样.请你以"A Role Model in My Daily Life."为主题,给他写一封邮件,告诉他你日常生活中的榜样是谁,做了哪些令你敬佩的事情,并谈谈你的体会与感受.提示词语:role model,set,example,help,learn,hope…答案和解析1.【答案】C【解析】答案:C.考查物主代词.句意:我通常在每学期开始时设定我的目标.根据题干I usually set ______goals at the beginning of each term.可知空后有名词goals,所以用形容词性物主代词my.故选C.我通常在每学期开始时设定我的目标.理解各个选项的含义,仔细分析句子的结构,掌握一些固定用法,根据具体内容作答.2.【答案】B【解析】答案:B.考查介词.A为了.B和.C属于.D在几点或小地点.be familiar with 熟悉某人、某物.固定搭配.选B.--你熟悉这部电影吗,梅利莎?--是的,我看过两次了.考查介词用法,这个知识点很广泛,有一些固定用法,需要日常积累,结合语境选择正确介词完成习题.3.【答案】B【解析】答案:BAs soon as"一…就…",Since"由于,既然",Though"尽管,即使",Unless"除非",根据句意可知,此处是since引导原因状语从句,故答案为B.由于雨下得很大,我们只好在学校里呆在室内.做单项选择填空的技巧是:排除比较法.根据上下文意思或时间状语,推断出合适的时态,排除错误的答案,然后再比较剩下的选择项,从而做出正确的答案.4.【答案】A【解析】答案:A 分析句子,结合选项,推测意思是电子书比一般普通的纸质书要贵得多.后面than是比较级的标志,故选A更贵的.电子书比一般普通的纸质书要贵得多.解答这类试题时,务必充分理解上下文的语境和前后文的逻辑关系,找到解题的依据,同时正确区分选项的细微差别,准确作答.5.【答案】D【解析】答案:D 分析句子,结合选项,推测意思是埃里克,你能谈谈中国的太空计划的历史吗?当然,让我先给你看一些照片.故选D能,可以.A必须,B需要,C或许,可能.埃里克,你能谈谈中国的太空计划的历史吗?当然,让我先给你看一些照片.解答这类试题时,务必充分理解上下文的语境和前后文的逻辑关系,找到解题的依据,同时正确区分选项的细微差别,准确作答.6.【答案】A【解析】答案:A 分析句子,结合选项,推测意思是看,贝蒂和布鲁斯正在艺术室里画画.这里表示正在进行的动作,用现在进行时,结构是am/is/are doing,主语是复数,故选A.看,贝蒂和布鲁斯正在艺术室里画画.解答这类试题时,务必充分理解上下文的语境和前后文的逻辑关系,找到解题的依据,同时正确区分选项的细微差别,准确作答.7.【答案】C【解析】答案:C.根据If you _______up late,you will feel tired the next day,可知if引导的条件状语从句,主句用一般将来时态,从句用一般现在时态.故选C.如果你熬夜到很晚,第二天你就会感到疲倦.一般现在时态通常表示习惯性动作或客观事实,注意一些时间状语用法,结合语境,完成试题.8.【答案】D【解析】答案:D.根据Mr.King asks us _______ a car with our friends to school,可知句子考查ask sb to do sth表示要求某人做某事.故选D.金先生让我们和朋友们一起去学校开车.本题考查不定式短语的及固定短语的用法,根据句意和语境,从而判断出正确答案.9.【答案】D【解析】答案:D.根据The lights in my room _______off when I left yesterday morning,这里 yesterday morning用于一般过去时,而主语lights表示动作的承受者,这里用一般过去时的被动语态,构成were/was+动词的过去分词.故选D.我昨天早上离开时,房间里的灯都关了.做单项选择填空的技巧是:排除比较法.即利用上下文的时间状语,推断出合适的时态,排除错误的答案,然后再比较剩下的选择项,从而做出正确的答案.10.【答案】C【解析】答案:C.根据Do you know 再结合选项,可知Do you know 后面是跟一个宾语从句,宾语从句中应该用陈述语序,即主语+谓语,选项AB是疑问句语序,排除,从at that time last night判断句子使用过去进行时.故选:C.--你知道昨晚琳达在写什么吗?--是的,为一份报纸写一篇报道.本题主要考查宾语从句,一定要注意宾语从句的引导词,以及宾语从句的时态和语序问题.把握好这几点,是做好此类题目的关键!11.【答案】【小题1】C 【小题2】A 【小题3】C 【小题4】D 【小题5】B【小题6】A 【小题7】D 【小题8】A 【小题9】B 【小题10】B【解析】31.答案:C.考查名词.句意:由于她的敏捷的思维,她和戴夫•刘易斯在__里免于危险.A.forest森林;B.sea海;C.mountains山;D.lake湖泊.根据第四行They dropped safely in the mountains他们安全地落山上了.可知选C.32.答案:A.考查动词.句意:在下午,这个组去湖上__.A.sailing航行;B.fishing钓鱼;C.skating滑冰;D.swimming游泳.根据on the lake在湖上.可知选A.33.答案:C.考查名词.句意:不幸的是著名的尼斯湖湖上方,悬挂式滑翔机飞进突如其来的风暴,失去__撞上了一座山.A.sight 视力;景象;眼界;B.trouble麻烦;烦恼;故障;C.control 控制;管理;抑制;D.date 日期;约会;年代;枣椰子.out of control失去控制.结合句意,可知选C.34.答案:D.考查形容词.句意:他们没有食物和水,所以他们又渴又饿又___.A.alone独自的(地);B.sad难过的;悲哀的,令人悲痛的;C.calm静的,平静的;沉着的;D.cold寒冷的;冷淡的,不热情的;失去知觉的.根据句意和语境,可知选D.35.答案:B.考查副词.句意:她收集了许多石头并且在地面形成了一个大招牌"SOS",直升机的飞行员可以很___找到它们.A.silently默默地;静静地;B.easily容易地;无疑地;C.simply简单地;仅仅;简直;朴素地;坦白地;D.carefully小心地.根据句意和语境可知,摆SOS是为了"容易"找到他们.选B.36.答案:A.考查名词.句意:附近的任何地方没有公用___.A.telephones 电话;B.libraries 图书馆;C.websites网站;D.bicycles 自行车;脚踏车.根据下文He had to walk a long way to call the police to look for the missing teenagers他不得不走很远的路叫警察去寻找失踪的青少年.和句意可知,应该是"电话".选A.37.答案:D.考查动词.句意:戴夫和曼迪被___,空运到因弗内斯的医院.A.given给;give up:放弃;B.put放,put up树立,搭建;C.woken醒来,wake up醒来;D.picked捡,挑选,采摘,pick up捡起;获得;收拾;(汽车;飞机)乘载.结合句意和语境可知,应该是pick up"接载"选D.38.答案:A.考查动词.句意:当直升机到达时,我们非常__.A.excited 兴奋的;激动的;B.confused 困惑的;混乱的;糊涂的;C.frustrated失意的,挫败的;泄气的;D.scared 害怕的.结合句意可知,终于获救了,应该是"激动的",选A.39.答案:B.考查动词.句意:他们要求我们穿上干燥的衣服,给我们__了一些热汤.他们是极好的.A.shared共享;B.offered提供,提议;C.cooked煮;D.provided提供;给予.Offer sth.to sb.:把某物提供给某人.结合句意可知选B.40.答案:B.考查动词.句意:警方___,在广播新闻,他们让步行者在高地仔细按照指示,不采取任何冒险.A.insisted坚持;B.agreed同意;C.considered 考虑;D.suggested建议.根据上一句he told us not to leave the group.But I did not listen.I was very silly他告诉我们不要离开这个团体,但我不听,我很傻.可知,出事故了,警方应该是同意这种说法.选B.文章大意:这是一篇记叙文,本文主要介绍了麦迪•卡伦和戴夫•刘易斯去旅行.他们跟了旅行团,他们去悬挂式滑翔机飞行,其他人去湖上航行.而麦迪•卡伦和戴夫•刘易斯悬挂式滑翔机飞进风暴,失去控制撞上了一座山.麦迪•卡伦想了一个好主意.她收集了许多石头并且在地面形成了一个大招牌"SOS",直升机的飞行员可以很容易找到它们.最终他们获救了.完形填空题型,抓住文章的大意,挑出信息词.同时凭借自己掌握的语法知识和一般的常识,兼顾人称、性别、单复数、语法和时态等等语法的因素,从语法的结构方面考虑答案.细心检查,避免疏漏.21.【答案】【小题1】A 【小题2】D 【小题3】C【解析】答案:41.A 细节理解题.根据第一行句子The New York State Theater.可知在纽约.故选A.42.D 细节理解题.根据第三行句子Showing time:8:00a.m.-10:30a.m.Saturday,November 5;3:00p.m.-5:30p.m.Sunday,November 6.可知两个半小时.故选D.43.C 细节理解题.根据整篇文章内容及其倒数第三行句子Anyone who isinterested in Chinese life and history should see the play.任何对中国生活和历史感兴趣的人都应该去看这部戏剧.可知中国的历史和文化.故选C.本文主要是老舍的《茶馆》将在纽约大剧院演出的广告.介绍了演出时间和剧情及呼吁大家赶快订票.在通读全文的基础上,根据全文大意,展开逻辑思维,瞻前顾后,认真观察选项,仔细推敲,确定最佳答案.24.【答案】【小题1】B 【小题2】A 【小题3】C 【小题4】D【解析】44.B 细节理解题,根据"Martin,a musician from an American band,wanted to do the same"可知,马丁是一个美国乐队的音乐家.故答案为B.45.A 细节理解题,根据""I would like to see our beautiful Earth from space.There are lots of secrets to e xplore in space and I would go into space if I could."(Ben from China)"可知,本支持我们将在太空探索并发现它的秘密.故答案为A.46.C 细节理解题,根据"We are looking forward to hearing your opinions."可知,作者要求我们分享我们对太空旅行的看法.故答案为C.47.D 细节理解题,根据"A year later,Martin,a musician from an American band,wanted to do the same.He was only 22years old and probably very rich too.He h ad to go for a lot of training to see whether he was fit enough to travel.He is still waiting for his holiday of a lifetime."可知,马丁现在正忙于刻苦训练,为他的太空旅行做准备.故答案为D.文章大意:丹尼斯去太空旅游之后,一个美国音乐家马丁,也想去太空旅游.作者就这件事采访了一些青少年.阅读理解的做题技巧:先浏览所给的问题以及选择项,然后带着问题在通读原文的基础上快速地找到答案,然后再回过头来检查一遍,确保万无一失.还有,最好把答案所在的句子划出来,以便回来检查时更加的省时省力.28.【答案】【小题1】B 【小题2】D 【小题3】A 【小题4】B【解析】48.B 细节理解题,根据第一段的"The band has five members.They are Jack Berry,Ollie Gray,Harrison Paparatto,Austin Siegel and Evan Tucker."可知,乐队由五个成员组成,分别是Jack Berry,Ollie Gray,Harrison Paparatto,Austin Siegel和 Evan Tucker,没有Trent Berry.故答案为B.49.D 细节理解题,根据第二段的""We want to show people there is more to recycling than throwing things away i n the bin."Jack,16,told TFK."You can actually reuse materials.""可知,这五个十几岁的少年组成了乐队,为了呼吁人们利用身边的废弃物.故答案为D.50.A 细节理解题,根据第三段的"In between sets,they talk about recycling and offer tips for how to help the environment"和第四段的"The band donates(捐赠) the money from sales to charity.They have raised more than $2,500for Heifer International."可知,Garbage Men乐队主要告诉人们如何保护环境和做一些慈善活动.故答案为A.51.B 主旨大意题,A音乐和环境,B垃圾工人乐队,C自己做的乐器,D美国乡村音乐的先驱;通读全文可知,本文主要介绍倡导环保的"垃圾工人乐队".故答案为B.文章大意:本文介绍了The Garbage-Men乐队的成员用废弃的物品做乐器,呼吁大家保护环境,把营业收入的一部分用于慈善.阅读理解的做题技巧:先浏览所给的问题以及选择项,然后带着问题在通读原文的基础上快速地找到答案,然后再回过头来检查一遍,确保万无一失.还有,最好把答案所在的句子划出来,以便回来检查时更加的省时省力.32.【答案】【小题1】C 【小题2】C 【小题3】A 【小题4】B【解析】52.C,细节理解题,At this point,it doesn't matter what is causing it,but rather,what can be done about it.我们现在不应该关注气候变化产生了什么,应该努力去想办法解决气候变化的问题,选择C.53.C,细节理解题, get even hotter气候变化之后会更热,由此可知是本来就热的地方,选择C.54.A,细节理解题,No one knows anything for sure at this point because there is simply not enough d ata由于现在数据不足,没有人知道会发生什么,由此可知是数据量足够的话就有可能改变现状,选择A.55.B,主旨大意题,文章首句提到According to a new scientific research,we are rapidly going close to major climate change and the effects on the environ ment could be quite serious气候变化很迅速,我们生活的环境会更加的糟糕,下文也主要讲述的是气候变化的影响,选择B.文章大意文章主要讲述的是有关于气候变化的事情.现在气候变化很明显,已经切实的影响到了我们的生活,比如汶川大地震等,我们现在应该努力寻找更多的数据,尽力解决气候变化的问题.对于阅读表达题,一定要记得首先通读全文,了解文章大意,然后再根据文章关键词,关键句,掌握细节问题,并进行推理判断,再去回答具体的问题.36.【答案】Yes,they could.;Because we get some of their DNA to make our own.;In 1961.;The doctors can save patients from several diseases.;People are having a debate about DNA【解析】答案:61.Yes,they could.细节理解题.根据第一段句子On June 26th,2000,two scientists,called Francis Collins and Craig Venter,told the world that they could now read the whole"map"of the human body2000年6月26日,两位科学家,弗兰克斯.柯林斯和克莱格.温特,向外界宣告他们已经完全破译了"人体地图":可知他们已经完全破译了"人体地图".故答案为Yes,they could.62.Because we get some of their DNA to make our own.细节理解题.根据第一段第二行句子DNA is the reason that we look like our mother and father,because we get some of their DNA to make our own.DNA是我们长的像父母的原因,因为我们从父母那里遗传到一部分他们的DNA.可知因为我们从父母那里遗传到一部分他们的DNA.故答案为Because we get some of their DNA to make our own.63.In 1961.细节理解题.根据第三段句子In 1961,Marshall Nirenberg and Johann Matthaei found the first"word"that they could understand in that language,1961年,马歇尔.尼日伯格和约翰.马萨尔发现遗传微粒携带的信息显示出遗传微粒是怎么样指导细胞生成的.可知在1961年发现的.故答案为In 1961.64.The doctors can save patients from several diseases.细节理解题.根据第三段句子we can help save people from several diseases.So the more we understand,the more doctors will be able to do.我们可以帮助人们避免多种疾病.所以我们越了解,医生就能做的越多.可知医生们可以把病人从几种疾病中拯救出来.故答案为The doctors can save patients from several diseases.65.People are having a debate about DNA.细节理解题.根据最后一段内容及其句子Most people hope that this will help to make better medicine and help people who are very ill.Other people worry about that when we learn more wordsand find out lots of other information大多数人希望这将有助于制造更好的药物救治生病的人.另一些人担心这可能会带来一些不好的结果.可知说的是人们正在就DNA进行辩论.故答案为People are having a debate about DNA.短文介绍了科学家对DNA的研究历程.大多数人希望这将有助于制造更好的药物救治生病的人.其也有人担心这可能会带来一些不好的结果.做题时首先对原文材料迅速浏览,掌握全文的主旨大意.其次,细读题材,各个击破.掌握全文的大意之后,细细阅读材料后的问题,弄清每题要求后,带着问题,再回到原文中去寻找、捕获有关信息.37.【答案】【小题1】D【小题2】C【小题3】B【小题4】A【小题5】E【解析】答案:56.D 细节推理题.根据下文They were good at making bicycles,他们擅长制造自行车.可知结合选项,应说他们在美国俄亥俄州有一家自行车商店.故选D.57.C 细节推理题.根据上文The plane builders had two main problems飞机制造有两个主要问题.可知结合选项,应说他们的机翼没有足够的坚固.故选C.58.B 细节推理题.根据上文They made small model planes in the bicycle shop and they built a wind tunnel(风道)to test the models.They also built real gliders.他们在自行车店做了小型模型飞机,他们建造了一个风洞来测试模型.他们还建造了真正的滑翔机.可知结合选项,应说最后,他们用一个叫做。

北京市大兴区九年级(上)期末数学试卷 (3)

北京市大兴区九年级(上)期末数学试卷 (3)

北京市大兴区九年级(上)期末数学试卷一、选择题(本题共10道小题,每小题3分,共30分)在每道小题给出的四个备选答案中,只有一个是符合题目要求的,请将所选答案前的字母按规定要求填涂在答题纸第1-10题的相应位置上.1.(3分)已知5x=6y(y≠0),那么下列比例式中正确的是()A.B.C.D.2.(3分)已知:如图,将∠ABC放置在正方形网格纸中,其中点A、B、C均在格点上,则tan∠ABC的值是()A.2B.C.D.3.(3分)抛物线y=2(x﹣1)2﹣5的顶点坐标是()A.(1,5)B.(﹣1,﹣5)C.(1,﹣5)D.(﹣1,5)4.(3分)两个相似三角形的面积比是9:4,那么它们的周长比是()A.9:4B.4:9C.2:3D.3:25.(3分)下列命题正确的是()A.三角形的外心到三边距离相等B.三角形的内心不一定在三角形的内部C.等边三角形的内心、外心重合D.三角形不一定有内切圆6.(3分)某闭合电路中,电源的电压为定值,电流I(A)与电阻R(Ω)成反比例.如图所示的是该电路中电流I与电阻R之间的函数关系的图象,则用电阻R表示电流I的函数解析式为()A.I=B.I=C.I=D.I=7.(3分)如图,C是⊙O上一点,O为圆心,若∠C=40°,则∠AOB为()A.20°B.40°C.80°D.160°8.(3分)将二次函数y=5x2的图象先向右平移3个单位,再向上平移4个单位后,所得的图象的函数表达式是()A.y=5(x﹣3)2+4B.y=5(x+3)2﹣4C.y=5(x+3)2+4D.y=5(x﹣3)2﹣49.(3分)在平面直角坐标系xOy中,如果⊙O是以原点O(0,0)为圆心,以5为半径的圆,那么点A(﹣3,﹣4)与⊙O的位置关系是()A.在⊙O内B.在⊙O上C.在⊙O外D.不能确定10.(3分)小军每天坚持体育锻炼,一天他步行到离家较远的公园,在公园休息了一会儿后跑步回家.下面的四个函数图象中,能大致反映当天小军离家的距离y与时间x的函数关系的是()A.B.C.D.二、填空题(本题共6道小题,每小题3分,共18分)11.(3分)抛物线y=x2﹣2x+5的对称轴为.12.(3分)已知扇形的圆心角为120°,面积为3π,则扇形的半径是.13.(3分)抛物线y=5x2+1与抛物线C关于x轴对称,则抛物线C的表达式为.14.(3分)已知点A(a1,b1),点B(a2,b2)在反比例函数的图象上,且a1<<0,那么b1与b2的大小关系是b1b2.15.(3分)“圆材埋壁”是我国古代数一学著作《九章算术》中的一个问题.“今有圆材,埋壁中,不知大小,以锯锯之,深一寸,锯道长一尺,问径几何?”用现在的数学语言表达是:如图所示,CD为⊙O的直径,弦AB⊥CD,垂足为E,CE=1寸,AB=1尺,则直径CD长为寸.16.(3分)已知半径为2的⊙O,圆内接△ABC的边AB=2,则∠C=.三、解答题(本题共13道小题,第17-26题,每小题5分,第27题7分,第28题7分,第29题8分,共72分)17.(5分)计算:.18.(5分)如图,点A是一次函数y=2x与反比例函数(m≠0)的图象的交点.过点A作x轴的垂线,垂足为B,且OB=2.求点A的坐标及m的值.19.(5分)已知:如图,在平行四边形ABCD中,F是AB上一点,连结DF并延长交CB的延长线于E.求证:AD•AB=AF•CE.20.(5分)已知二次函数y=ax2+bx+c中,函数y与自变量x的部分对应值如下表:x…01234…y…52125…(1)求该二次函数的表达式;(2)当x=6时,求y的值;(3)在所给坐标系中画出该二次函数的图象.21.(5分)已知:如图,在由边长为1的小正方形组成的网格中,点A、B、C、D、E都在小正方形的顶点上,求tan∠ADC的值.22.(5分)德国心理学家艾宾浩斯(H.Ebbinghaus)研究发现,遗忘在学习之后立即开始,而且遗忘的进程并不是均匀的.最初遗忘速度很快,以后逐渐缓慢.他认为“记忆保持量是时间的函数”,他用无意义音节(由若干音节字母组成、能够读出、但无内容意义即不是词的音节)作记忆材料,用节省法计算保持和遗忘的数量.他通过测试,得到了一些数据如下表,然后又根据这些数据绘出了一条曲线,即著名的艾宾浩斯记忆遗忘曲线,如下图.该曲线对人类记忆认知研究产生了重大影响.时间间隔记忆保持量刚记完100%20分钟后58.2%1小时后44.2%8~9小时后35.8%1天后33.7%2天后27.8%6天后25.4%观察图象及表格,回答下列问题:(1)2小时后,记忆保持量大约是多少?(2)说明图中点A的坐标表示的实际意义.(3)你从记忆遗忘曲线中还能获得什么信息?写出一条即可.23.(5分)某食品零售店为仪器厂代销一种面包,未售出的面包可退回厂家,以统计销售情况发现,当这种面包的单价定为7角时,每天卖出160个.在此基础上,这种面包的单价每提高1角时,该零售店每天就会少卖出20个.考虑了所有因素后该零售店每个面包的成本是5角.设这种面包的单价为x(角),零售店每天销售这种面包所获得的利润为y(角).(1)用含x的代数式分别表示出每个面包的利润与卖出的面包个数;(2)求y与x之间的函数关系式;(3)当面包单价定为多少时,该零售店每天销售这种面包获得的利润最大?最大利润为多少?24.(5分)如图,小文家的小区有一人工湖,湖的北岸有一条笔直的小路,湖上原有一座小桥与小路垂直相通,现小桥有一部分已断裂,另一部分完好.小文站在完好的桥头点A处,测得北岸路边的小树所在位置D点在他的北偏西30°,向正北方向前进32米到断口B点,又测得D点在他的北偏西45°.请根据小文的测量数据,计算小桥断裂部分的长.(,结果保留整数)25.(5分)已知:如图,⊙O的半径OC垂直弦AB于点H,连接BC,过点A 作弦AE∥BC,过点C作CD∥BA交EA延长线于点D,延长CO交AE于点F.(1)求证:CD为⊙O的切线;(2)若BC=5,AB=8,求OF的长.26.(5分)已知:如图,在△ABC中,a,b,c分别为∠A,∠B,∠C的对边,若2b=a+c,∠B=30°,△ABC的面积为,求a2+c2的值.27.(7分)抛物线y=x2﹣4与x轴的两个交点分别为A、B(A在B左侧),与y 轴的交点为C.(1)求点A、B、C的坐标;(2)将抛物线沿x轴正方向平移t个单位(t>0),同时将直线l:y=3x沿y轴正方向平移t个单位.平移后的直线为l',平移后A、B的对应点分别为A'、B'.当t为何值时,在直线l'上存在点P,使得△A'B'P是以A'B'为直角边的等腰直角三角形?28.(7分)已知:如图,AB为⊙O的直径,G为AB上一点,过G作弦CE⊥AB,在上取一点D,分别作直线CD、ED,交直线AB于点F、M,分别连结OE,CO,CM.(1)若G为OA的中点.①∠COA=°,∠FDM=°;②求证:FD•OM=DM•CO.(2)如图,若G为半径OB上任意一点(不与点O、B重合),过G作弦CE⊥AB,点D在上,仍作直线CD、ED,分别交直线AB于点F、M,分别连结OE,CO,CM.①依题意补全图形;②此时仍有FD•OM=DM•CO成立.请写出证明FD•OM=DM•CO的思路.(不写出证明过程)29.(8分)一般地,在Rt△ABC中,∠C=90°,我们把锐角A的对边与斜边的比叫做∠A的正弦,记作“sin A”,即.类似的,我们定义:在等腰三角形中,底边与腰的比叫做顶角的正对.如图1,在△ABC中,AB =AC,顶角A的正对记作sadA,即sadA=.根据上述角的正对定义,完成下列问题:(1)sad60°=;(2)已知:如图2,在Rt△ABC中,∠C=90°,sin A=,试求sadA的值;(3)已知:如图3,在平面直角坐标系xOy中,A(0,2),B(,0),点C 为线段AB上一点(不与点B重合),且,以AC为底边作等腰△ACP,点P落在直线AB上方,①当sad∠APC=时,请你判断PC与x轴的位置关系,并说明理由;②当sad∠APC=时,请直接写出点P的横坐标x的取值范围.北京市大兴区九年级(上)期末数学试卷参考答案一、选择题(本题共10道小题,每小题3分,共30分)在每道小题给出的四个备选答案中,只有一个是符合题目要求的,请将所选答案前的字母按规定要求填涂在答题纸第1-10题的相应位置上.1.B;2.A;3.C;4.D;5.C;6.D;7.C;8.A;9.B;10.C;二、填空题(本题共6道小题,每小题3分,共18分)11.x=1;12.3;13.y=5x2+1;14.<;15.26;16.60°或120°;三、解答题(本题共13道小题,第17-26题,每小题5分,第27题7分,第28题7分,第29题8分,共72分)17.;18.;19.;20.;21.;22.;23.;24.;25.;26.;27.;28.60;120;29.1;。

北京市大兴区九年级(上)期末数学试卷 (2)

北京市大兴区九年级(上)期末数学试卷 (2)

北京市大兴区九年级(上)期末数学试卷一、选择题(共8小题,每小题4分,共32分)在下列各题的四个备选答案中,只有一个是正确的,请将正确选项前的字母填在下表相应的空格内.1.(4分)已知3x=5y(xy≠0),则下列比例式成立的是()A.B.C.D.2.(4分)抛物线y=x2﹣2x+3的顶点坐标是()A.(1,﹣2)B.(1,2)C.(﹣1,2)D.(﹣1,﹣2)3.(4分)在△ABC中,锐角A、B满足|sin A﹣|+[cos(B﹣15°)﹣]2=0,则△ABC是()A.等腰三角形B.直角三角形C.等腰直角三角形D.无法确定4.(4分)如图,AB是⊙O的直径,C、D是⊙O上两点,CD⊥AB,若∠DAB =65°,则∠AOC等于()A.25°B.30°C.50°D.65°5.(4分)如图,已知AB是⊙O的直径,CD是弦且CD⊥AB,BC=6,AC=8,则sin∠ABD的值是()A.B.C.D.6.(4分)在一个口袋中有4个完全相同的小球,把它们分别标号为①,②,③,④,随机地摸出一个小球,记录后放回,再随机摸出一个小球,则两次摸出的小球的标号相同的概率是()A.B.C.D.7.(4分)已知:如图,点A,B,C,D的坐标分别是(1,7),(1,1),(4,1),(6,1).若以C,D,E(E在格点上)为顶点的三角形与△ABC相似,则满足条件的点E的坐标共有()A.6个B.5个C.4个D.3个8.(4分)已知抛物线y=ax2+bx和直线y=ax+b在同一坐标系内的图象如图,其中正确的是()A.B.C.D.二、填空题(共4小题,每小题4分,共16分)9.(4分)△ABC中,∠C:∠B:∠A=1:2:3,则三边之比a:b:c=.10.(4分)点A(x1,y1)、B(x2,y2)在二次函数y=x2﹣2x﹣1的图象上,若x2>x1>1,则y1与y2的大小关系是y1y2.(用“>”、“<”、“=”填空)11.(4分)如图,一扇形纸扇完全打开后,外侧两竹条AB和AC的夹角为120°,AB长为30cm,贴纸部分的宽为20cm,则贴纸部分的面积为cm2.12.(4分)函数y1=的图象如图所示.设点P在y1=的第一象限内的图象上,PC⊥x轴,垂足为C,交y2=﹣的图象于点A,PD⊥y轴,垂足为D,交y2=﹣的图象于点B,则三角形P AB的面积为.三、解答题(本题共20分,每小题5分)13.(5分)计算:2sin60°+3tan30°﹣2tan60°﹣cos45°.14.(5分)如图,△ABC中,AE交BC于点D,∠C=∠E,AD:DE=3:5,AE=8,BD=4,求DC的长.15.(5分)如图,一次函数y1=kx+b的图象与反比例函数的图象交于A(1,6),B(a,2)两点.(1)求一次函数与反比例函数的解析式;(2)直接写出y1≥y2时x的取值范围.16.(5分)如图,某数学兴趣小组想测量一棵树CD的高度,他们先在点A处测得树顶C的仰角为30°,然后沿AD方向前行10m,到达B点,在B处测得树顶C的仰角高度为60°(A、B、D三点在同一直线上).请你根据他们测量数据计算这棵树CD的高度(结果精确到0.1m).(参考数据:≈1.414,≈1.732)四、(本题5分)17.(5分)将表示下列事件发生的概率的字母标在图中:(1)投掷一枚骰子,掷出7点的概率P1;(2)在数学测验中做一道四个选项的选择题(单选题),由于不知道那个是正确选项,现任选一个,做对的概率P2;(3)袋子中有两个红球,一个黄球,从袋子中任取一球是红球的概率P3;(4)太阳每天东升西落P4;(5)在1~100之间,随机抽出一个整数是偶数的概率P5.五、解答题(本题共25分,每小题5分)18.(5分)已知:如图,以△ABC的一边BC为直径的⊙O分别交AB、AC于D、E两点.(1)当△ABC为等边三角形时,则图1中△ODE的形状是;(2)若∠A=60°,AB≠AC(如图2),则(1)的结论是否还成立?请说明理由.19.(5分)抛物线y=﹣x2+(m﹣1)x+m与y轴交于(0,3)点.(1)求出m的值并在给出的直角坐标系中画出这条抛物线;(2)根据图象回答下列问题:①方程﹣x2+(m﹣1)x+m=0的根是多少?②x取什么值时,y<0?20.(5分)在四边形ABCD中,AB=AD=8,∠A=60°,∠D=150°,四边形周长为32,求BC和CD的长度.21.(5分)已知:如图,二次函数y=﹣mx2+4m的顶点坐标为(0,2),矩形ABCD的顶点B、C在x轴上,矩形ABCD在抛物线与x轴所围成的图形内.(1)求二次函数的表达式;(2)设点A的坐标为(x,y)(x>0,y>0),试求矩形ABCD的周长P关于自变量x的函数表达式,并求出自变量x的取值范围.22.(5分)已知:如图1,在面积为3的正方形ABCD中,E、F分别是BC和CD边上的两点,AE⊥BF于点G,且BE=1.(1)求出△ABE和△BCF重叠部分(即△BEG)的面积;(2)现将△ABE绕点A逆时针方向旋转到△AB′E′(如图2),使点E落在CD边上的点E′处,问△ABE在旋转前后与△BCF重叠部分的面积是否发生了变化?请说明理由.六、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)如图,已知二次函数y=a(x﹣h)2+的图象经过原点O(0,0),A(2,0).(1)写出该函数图象的对称轴;(2)若将线段OA绕点O逆时针旋转60°到OA′,试判断点A′是否为该函数图象的顶点?24.(7分)如图,点C在以AB为直径的半圆上,AB=8,∠CBA=30°,点D在线段AB上从点A运动到点B,点E与点D关于AC对称,DF⊥DE于点D,并交EC的延长线于点F(1)求证:CE=CF;(2)求线段EF的最小值;(3)当点D从点A运动到点B时,试求线段EF扫过的面积(直接写出结果).25.(8分)如图,在平面直角坐标系中,以点C(1,1)为圆心,2为半径作圆,交x轴于A,B两点,点P在优弧上.(1)求出A,B两点的坐标;(2)试确定经过A、B且以点P为顶点的抛物线解析式;(3)在该抛物线上是否存在一点D,使线段OP与CD互相平分?若存在,求出点D的坐标;若不存在,请说明理由.北京市大兴区九年级(上)期末数学试卷参考答案一、选择题(共8小题,每小题4分,共32分)在下列各题的四个备选答案中,只有一个是正确的,请将正确选项前的字母填在下表相应的空格内.1.A;2.B;3.C;4.C;5.D;6.C;7.A;8.D;二、填空题(共4小题,每小题4分,共16分)9.2::1;10.<;11.;12.6.4;三、解答题(本题共20分,每小题5分)13.;14.;15.;16.;四、(本题5分)17.;五、解答题(本题共25分,每小题5分)18.等边三角形;19.;20.;21.;22.;六、解答题(本题共22分,第23题7分,第24题7分,第25题8分)23.;24.;25.;。

北京市大兴区九年级上期末考试数学试题及答案

北京市大兴区九年级上期末考试数学试题及答案

大兴区-第一学期期末检测试卷初 三 数 学学校 姓名 准考证号考生须知 1.本试卷共4页,共五道大题,25道小题,满分120分。

考试时间120分钟。

2.在试卷和答题卡上认真填写学校名称、姓名和准考证号。

3.试题答案一律填涂或书写在答题卡上,在试卷上作答无效。

4. 在答题卡上,选择题、作图题用2B 铅笔作答,其他试题用黑色字迹签字笔作答。

5.考试结束,请将本试卷、答题卡和草稿纸一并交回。

一、选择题(本题共32分,每小题4分)下面各题均有四个选项,其中只有一个..是符合题意的. 1.二次函数()225=--+y x 图象的顶点坐标是 A.()2,5-B.()2,5C.()25,--D.()52,-2.在ABC ∆中, ︒=∠90C ,3sin =B ,则B ∠为 A .︒30 B .︒45C .︒60D .︒903.将抛物线23=y x 先向上平移1个单位长度后,再向左平移1个单位长度,所得抛物线的解析式是 A.23(1)1=-+y x B.23(1)1=+-y x C.23(1)1=--y xD.23(1)1=++y x4.如图,AB 是⊙O 的直径,弦AB CD ⊥,垂足为E,如果10,8AB CD ==, 那么线段AE 的长为A .4 B.3 C.2 D.65.若反比例函数1k y x-=的图象在各自象限内,y 随x 的增大而减小,则k 的值可能是 A .4-B .5C .0D .2-6.将抛物线 224=+y x 绕原点O 旋转180°,则旋转后的抛物线的解析式为A . 22=-y xB . 224=-+y xC . 224=--y xD . 224=-y x7.若点B (a ,0)在以点A (1,0)为圆心,以3为半径的圆内, 则a 的取值范围为 A .42 a -B .4 aC .2- aD .4 a 或2- a8. 已知:如图, Rt ABC ∆中,∠=︒==BAC BC AB E 901312,,,是BC 边上一点,过点E 作DE BC ⊥,交AC 所在直线于点D ,若BE=x , ∆DCE 的面积为y ,则y 与x 的函数图象大致是二、填空题题(本题共16分,每小题4分)9.已知ABC DEF △∽△,相似比为3:1,且ABC △的周长为18,则DEF △的周长为 .10.如图,AB 是⊙O 的直径,CD 是⊙O 的弦.若∠BAD =22°, 则ACD ∠的大小为 .11.半径为4 cm 的扇形的圆心角的度数为270°则扇形的面积为__ cm 2.12.二次函数的解析式为y ax bx c =++2,满足如下四个条件:abc a b c =++=03;;3425a b c ++=,a b c << . 则a = , c = .三、解答题(本题共30分,每小题5分)13103cos 3022sin 4531)-︒+-︒--14. 已知: 如图,在ABC △中,D 是AB 上一点, E 是AC 上一点, 且∠ADE =∠ACB.(1)求证:△AED ∽△ABC ;(2)若DE: CB=3:5 ,AE=4, 求AB 的长.15. 已知:如图,在Rt △ABC 中,∠C=90°,AB=10,4sin 5A =,求BC 的长和∠B 的正切值.16.已知:如图,二次函数22y axbx =+-的图象经过A 、B 两点,求出这个二次函数解析式.17.已知:如图,反比例函数xky =的图象与一次函数2y x =+ 的图象交于点A (1,m), 求反比例函数xky =的解析式.∴18. 已知:如图,A 、B 、C 为⊙O 上的三个点,⊙O 的直径为8cm , ∠ACB=30°,求AB 的长.四、解答题(本题共20分,每小题5分)19.四张大小、质地均相同的卡片上分别标有数字1,2,3,4,现将标有数字的一面朝下扣在桌子上,从中随机抽取一张,再从剩下的三张中随机抽取一张.(1)用画树状图的方法,列出前后两次抽得的卡片上所标数字的所有可能结果; (2)求抽得的两张卡片上的数字之积为奇数的概率.20. 已知:如图,在△ABC 中,AD 是BC 边上的高,E 是AC 边的中点,BC AD B ===141245,,sin . (1)求线段CD 的长; (2)求tan EDC ∠的值.21..已知:如图,AB 是⊙O 的直径,⊙O 过BC 的中点D , 且DE ⊥AC 于点E.(1)求证:DE 是⊙O 的切线;(2)若∠C=30°,CD=12,求⊙O 的直径.22. 已知:△ABC 中,ACB ABC ∠=∠,以AB 为直径的⊙O 交BC 于点D. (1)如图1,当∠A 为锐角时,AC 与⊙O 交于点E ,联结BE , 则∠∠BAC CBE 与的数量关系是∠BAC = ∠CBE ;图1(2)如图2,若AB 不动,AC 绕点A 逆时针旋转,当∠BAC 为钝角时, CA 的延长线与⊙O 交于点E ,联结BE ,(1)中∠∠BAC CBE 与的数量关 系是否依然成立?若成立,请加以证明;若不成立,请说明理由.图2五、解答题(本题共22分,第23题7分,第24题7分,第25题8分) 23.已知:如图,二次函数21212()6363y x m x m =+++(04m )的图象与x 轴交于A 、B 两点.(1)求A 、B 两点的坐标(可用含字母m 的代数式表示);(2)第一象限内的点C 在二次函数21212()6363y x m x m =+++的图象上,且它的横坐标与纵坐标之积为9,∠BAC 的正弦值为35 ,求m 的值.24.已知:如图,Rt MPN ∆的顶点P 在正方形ABCD 的边AB 上,∠MPN=90°,PN 经过点C ,PM 与AD 交于点Q .(1)在不添加字母和辅助线的情况下,图中△APQ ∽△ ;(2)若P 为AB 的中点,联结CQ ,求证:AQ +BC =CQ ;(3)若14=AQ AD 时,试探究线段PC 与线段PQ 的数量关系,并加以证明.25. 已知:在平面直角坐标系xOy 中,二次函数y x bx c =-++2的图象与x 轴交于A 、B 两点,与y 轴交于点C ,点A 在x 轴负半轴上,点B 在x 轴正半轴上,且3,4CO BO AO AB ===,抛物线的顶点为D.(1)求这个二次函数的解析式;(2)点E(0,n )在y 轴正半轴上,且位于点C 的下方. 当n 在什么范围内取值时∠CBD <∠CED ?当n 在什么范围内取值时∠CBD >∠CED ?(3)若过点B 的直线垂直于BD 且与直线CD 交于点P ,求点P 的坐标.E DCBA大兴区2013~2014第一学期期末检测试卷初三数学参考答案及评分标准一、选择题(本题共32分,每小题4分) 题 号 1 2 3 4 5 6 7 8 答 案BCDCBCAD二、填空题(本题共16分,每小题4分)题 号 9 10 11 12 答 案 66812π1;4-三、解答题(本题共30分,每小题5分)13.解: -︒+-︒--103cos 3022sin 45(31)=311122+--………………………………….……………4分 =0………………………………….……………5分14.(1)证明:∵∠A =∠A ,∠ADE =∠ACB, …… 1分 ∴△AED ∽△ABC.………………………………… 2分(2)解:∵△AED ∽△ABC ,∴AE AB =EDBC.…………………………………3分∵DE : CB =3:5 ,AE =4,∴435AB = ………………………………4分 ∴203=AB . (5)分 15. 解:在Rt △ABC 中,∠C=90°,AB=10,4sin =105BC BC A ==AB …………………………….……………1分∴BC =8, ………………………………………………………2分根据勾股定理得:22=6AC =AB -BC……………………………………………3分则3tan =4AC B =BC. ………………………………………………5分16.解:(1)由图可知A (-1,-1),B (1,1) ………………………………….……………2分 依题意,得21,21a b a b --=-⎧⎨+-=⎩解,得2,1.a b =⎧⎨=⎩………………………………….……………4分∴ y =2x 2+x -2. ………………………………….……………5分 17. 解:点A (1,m )在一次函数2y =x +图象上,∴12m =+,即3m =.∴A (1,3) ………………………………….……………2分∵反比例函数ky x=的图象与一次函数2y =x +的图象交于点A (1,3)∴31=k,即3=k . ………………………………….……………4分 ∴反比例函数解析式为3y x =. ……………………………….……………5分18.解:作直径BD ,联结AD ,∴∠BAD =90°,…………………………………………………..2分∵∠ACB =30°∴∠ADB =∠ACB =30°,…………………………………….4分 ∵DB =8,∴AB =DB =4,………………………………………………….5分 所以AB 的长为4cm.四、解答题(本题共20分,每小题5分)19.解:(1)用画树状图的方法,列出前后两次抽得的卡片上所标数字的所有可能结果如下:DOCByxOA1234123412341234第一次第二次前后两次抽得的卡片上所标数字的所有可能结果共有12种 ………………………4分(2)∵ 共有12种可能的结果,每个结果发生的可能性都相同,所有的结果中,满足抽得的两张卡片上的数字之积为奇数的结果有2个, ∴ P (积为奇数)=16………………………5分20. 解:(1)90AD ABC ADB ∴∠=是△的高,°.在Rt △ABD 中4sin 125B AD ==,,15=∴AB . ………………………………………………………1分229BD AB AD ∴=-=. ……………………………………2分=14=53BC CD ∴,............分(2)在Rt △ADC 中,90ADC ∠=° 12tan = (45)Rt 12tan = (5)AD C =CDDE ΔDCA AC DE =EC. EDC = C.EDC ∴∴∴∠∠∴∠.分为斜边中线,...........5分21.证明: (1)联结OD .AB 是直径,∴O 是AB 的中点.D 是BC 的中点,∴OD ∥AC .∴∠AED +∠EDO =180°DE ⊥AC ,∴∠AED =90°.∴∠EDO =90°. …………………………1分D 是⊙O 上一点,∴DE 是⊙O 的切线. ………………………2分 (2)联结AD .AB 是⊙O 的直径,∴∠ADB =90°,∴△ADC 是直角三角形. …………………………3分 ∠C =30°,CD =12, ∴AD =CD ·tan30°. ∴AD =343312=. …………………………4分 OD ∥AC ,∴∠C =∠ODB =30°. OB =OD ,∴∠B =∠ODB =30°. ∴∠AOD =60°. ∴OA =OD =AD =34.∴AB =38 ……………………5分22.(1)2 ………………..2分 (2)(1)中∠BAC 与∠CBE 的数量关系成立. 证明:联结AD ,90,...............................3180.360180.180...............................42AB O AD BCAEB ADB AEB ADB AEB ADB CBE EAD CBE EAD DAC EAD CBE DAC AB AC BAC DAC ∴⊥∴∠=∠=︒∴∠+∠=︒∠+∠+∠+∠=︒∴∠+∠=︒∠+∠=︒∴∠=∠=∴∠=∠为的直径,分,,分又,2...............................5BAC CBE∴∠=∠分五、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:(1)2()12126363y =x ++m x +m 在中, 令y =0,得2(4)40x ++m x +m =,x 1= -4,x 2= -m ,∵0<m <4,∴ A (-4,0),B (-m ,0). …………… 2分(2) 过点C 作CD ⊥x 轴,垂足为D ,∵ sin ∠BAC = CD AC = 35 ,∴设CD =3k ,AC =5k , ∴AD =4k , ∵ OA = 4, ∴OD = 4k –4, ∴ C (4k –4,3k ) .∵点C 的横坐标与纵坐标之积为9, ∴3(4-4)=9k k ,∴k 1=- 12 (不合题意,舍去),k 2= 32 . ………………………… 4分∴C (2,92 ). ………………………………………… 5分∵点C 在二次函数21212()6363y =x ++m x +m 的图象上,∴ 2121292()263632++m +m =⨯⨯,∴5=2m …………………………………… 7分 24.解:(1)BCP ∆. …………………………………………1分 (2)证明:延长QP 交CB 的延长线于点E . ∵P 为AB 中点, ∴P A =PB .∵ABCD 是正方形,∴∠QAP =∠PBC =∠EBP =90°. ∵∠APQ =∠EPB ,∴APQ ∆≌BPE ∆. …………………………………2分 ∴AQ =BE ,PQ =PE . ∵∠MPN =90°,∴CP ⊥QE . ∴CE=CQ .∴BE +BC =CQ.∴AQ +BC =CQ . …………………………3分(3)当14AQ AD =时,有PC=2PQ .……………4分证明:∵ABCD 是正方形, ∴∠A=∠B =90°.AD =BC =AB . ∴∠3+∠2=90°.∵∠MPN =90° .∴∠1+∠2=180°-∠MPN =90°.∴∠1=∠3.∴APQ ∆∽BCP ∆ ………………………………………………………5分 ∴PQ AQ AP PC BP BC ==. ∵AQ =14AD =14AB , ∴14AB AP AB AP AB=-. ∴2214AB AB AP AP =⋅-. ∴12AP AB =. …………………………………………………6分 ∴12PQ AP AP PC BC AB ===. ∴PC =2PQ . …………………………………………………7分25. 解:(1)设AO m =34CO BO AO AB ===,,3CO BO m ∴==.341m m m ∴+==,.103003A B C ∴-点、点、点的坐标分别为(,)、(,)、(,). …………………1分 223y x x ∴=-++二次函数的解析式为. ……………………………………2分(2)二次函数223y x x =-++的图象的顶点D 的坐标为(1,4)过点D 作DH y H ⊥轴于=1=123225DH CH =OH -OC CD BC BD ∴∴===,由题意,得,222CD BC BD ∴+=BCD ∴∆为直角三角形………………………………………………………3分21tan 332CD Rt BCD CBD BC ∆∠===在中, tan tan CBD CED CBD CED ∠=∠∠=∠若,则 1tan 33DH Rt EDH CED EH EH ∴∆∠==∴=在中, ∴OE =101E ∴此时点的坐标为(,)……………………………………………………4分131E C n CBD CED n CBD CED∴<<∠<∠<<∠>∠点位于点的下方当时,当0时,(3)BCD ∆为直角三角形 2B 927BC CD BD CD PBP BD BCD PCB BC CD PCPC ∴⊥∴⊥∴∆∆∴=∴=过点的直线垂直于且与直线交于点·………………………………………………………………分 设直线CD 的解析式为y kx b =+,∵C 点坐标(0,3),D 点坐标(1,4)∴直线CD 的解析式为3y x =+∴直线CD 与x 轴交点K 的坐标为(-3,0)∴OC =OK =3==453262CKO FKP CK PK ∠∠︒∴=∴=过点P 作PF x ⊥轴于F66PF FK ∴==,()96P ∴--点坐标为,………………………………………………8分说明:本试卷都只给出了一种解法,其它解法参照评分标准相应给分。

2013.1大兴初三期末考试数学试题及答案

2013.1大兴初三期末考试数学试题及答案

大兴区2012~2013学年度第一学期期末试题 初三数学第Ⅰ卷 (选择题 共32分)一、选择题(共8小题,每小题4分,共32分)在下列各题的四个备选答案中,只有一个是正确的.1.如图所示:△ABC 中,DE ∥BC ,AD=5,BD=10,AE=3,则CE 的值为2.函数23y x =--的图象顶点是 A .(0,3) B.(-1,3) C. (0,-3) D. (-1,-3) 3.已知∠A 为锐角,且sin A <21,那么∠A 的取值范围是A. 0°< A < 30°B. 30°< A <60°C. 60°< A < 90°D. 30°< A < 90°4.如图,AB 、CD 是⊙O 的弦,且AB ∥CD , 若∠BAD = 36°,则∠AOC 等于A .36° B. 54° C. 72° D. 90°5. 已知⊙O 的半径为1,点P 到圆心O 的距离为d ,若抛物线 22y x x d =-+与x 轴有两个不同的交点,则点PA 、在⊙O 的内部B 、在⊙O 的外部C 、在⊙O 上D 、无法确定6.已知如图(1)、(2)中各有两个三角形,其边长和角的度数已在图上标注,图(2)中AB 、CD 交于O 点,对于各图中的两个的两个三角形而言,下列说法正确的是A. 都相似B. 都不相似C. 只有(1)相似D. 只有(2)相似(1) (2) 7.有A ,B 两只不透明口袋,每只口袋里装有两只相同的球,A 袋中的两只球上分别写了“细”、“心”的字样,B 袋中的两只球上分别写了“信”、“任”的字样,从每只口袋里各摸出一只球,能组成..“信心”字样的概率是35757570AB CDO 4 3 6 8EABCDDCBAOA .43 B .32C .31D .418.已知函数))((b x a x y --=(其中a b >)的图象如下面右图所示,则函数b ax y +=的图象可能正确的是第Ⅱ卷 (非选择题 共88分)二、填空题(共4小题,每小题4分,共16分)9.如图,△ABC 的顶点都在方格纸的格点上,则sin A =_______.10.如图,矩形ABCD 的对角线BD的中点经过坐标原点,矩形的边分别平行于坐标轴,点C 在反比例函数221k k y x++=的图象上.若点A 的坐标为(-4,-1),则k 的值为___________.11.在一个不透明的袋中,装有若干个除颜色不同外其余都相同的球,如果袋中有3个红球且摸到红球的概率为 14 ,那么袋中球的总个数为错误!未找到引用源。

北京市大兴区九年级上学期语文期末考试试卷

北京市大兴区九年级上学期语文期末考试试卷

北京市大兴区九年级上学期语文期末考试试卷姓名:________ 班级:________ 成绩:________一、字词书写 (共1题;共5分)1. (5分)(2013·朝阳) 将下面一句话写在方格中。

要求:正确、规范、美观。

快乐,努力,做最好的自己!二、句子默写 (共1题;共8分)2. (8分)用课文原句填空。

(1) ________,意与日去,________,多不接世,悲守穷庐,________!(2)文中有两句话常被人们当作“明心立志”的座右铭,这两句话是:“________,________”。

(3)文章中有一句话表现了“躁”的危害,这句话是:“________”。

(4)全文围绕“________”这句话展开议论的。

三、综合性学习 (共4题;共38分)3. (8分) (2016九上·盐城期中) 阅读材料,按要求答题。

岁月匆匆,在不知不觉中,我们长大了,已经是初三毕业生了。

成长的点点滴滴绘成了一幅五彩斑斓的画卷。

成长的岁月如一片大海,烟波浩渺中却能看到彼岸;成长的岁月如一串脚印,踌chú徘徊中总能向前延伸;,。

岁月冲淡了我们的怅惘与顽皮,却给予了我们理智与深沉。

面对初三这一年紧张而忙碌的生活,我们不再无精打彩,我们学会了肃然起敬;我们不再浮光掠影,我们学会了融会惯通。

——这便是成长!(1)根据拼音写汉字,给划线字注音。

chú________踌________怅惘(2)画波浪线的句子有两个错别字,请找出并加以改正。

________改为________;________改为________(3)在横线处续写一个句子,使之与前文构成一组排比句。

4. (10分) (2017八下·重庆月考) 阅读下面关于中韩萨德事件的三则材料,按要求回答问题。

材料1:萨德导弹属于一种维护韩国自身安全的防御系统,但其雷达覆盖范围太大,超过2000公里,对中国安全造成了严重威胁,所以中方反对韩部署萨德导弹。

大兴区初三第一学期期末检测试卷——化学试卷(附答案)

大兴区初三第一学期期末检测试卷——化学试卷(附答案)

大兴区初三第一学期期末检测试卷化学学校姓名准考证号可能用到的相对原子质量H 1 C 12 O 16 Na 23 Si28第一部分选择题(共20分)(每小题只有1个选项符合题意。

每小题1分)1.下列变化中,属于化学变化的是A.酒精挥发B.镁条燃烧C.玻璃破碎D.冰雪融化2.空气中体积分数约为78%的气体是A.氮气B.氧气C.二氧化碳D.水蒸气3.下列物质在氧气中燃烧,产生大量白烟的是A.木炭B.镁条C.红磷D.铁丝4.下列气体中,有毒的是A.N2B.O2C.CO D.CO25.右图为地壳中元素含量分布图,其中能代表铝元素的是ArrayA.1 B.2C.3 D.46.下列饮品属于溶液的是A.蔗糖水B.牛奶C.果粒橙D.豆浆7.食用碘盐可预防甲状腺肿大等疾病。

这里的“碘”是指A.碘元素B.碘原子C.碘单质D.碘离子8.下列符号中,能表示两个氧分子的是A.2O B.2O2 C.CO2 D.O2-9.废弃的易拉罐和塑料瓶属于A.厨余垃圾B.其他垃圾C.可回收物D.有害垃圾10.氟元素的相关信息如右图所示。

下列说法中,不正确...的是A.质子数是10 B.氟是非金属元素C.原子序数是9 D.相对原子质量是19.0011.森林失火时,灭火队员通常要砍伐一些树木,开辟“防火隔离带”,其主要目的是A.隔离空气B.隔离可燃物C.降低可燃物温度D.开辟运输水的道路12.加热胆矾固体的实验过程中,操作正确的是A.取样B.加药C.加热D.熄灭13.下列物质的化学式中,书写正确的是A.氧化镁MgO2B.硫酸钾KSO4C.碳酸钠NaCO3D.氯化钙CaCl214.下列操作中,能鉴别空气、氧气和氢气3瓶气体的是A.观察气体颜色B.闻气体的气味C.插入燃着的木条D.倒入澄清石灰水15.下列物质的用途中,利用其化学性质的是A.液氮用作冷冻剂B.氧气用于炼钢C.金刚石作钻探机钻头D.氢气用于填充探空气球16.O2和O3化学性质不同的原因是A.原子排列顺序不同B.组成元素不同C.相对原子质量不同D.分子构成不同17选项实验目的实验方法A 鉴别H2和CH4分别点燃,并在火焰上方罩干冷烧杯B 检验一瓶气体是否为CO2将燃着的木条伸入瓶中C 将不饱和的石灰水变饱和加入适量的氧化钙D 分离二氧化锰和碳粉加水,过滤18.a 、b 两种物质的溶解度曲线如右图所示。

北京市大兴区九年级数学上学期期末检测试卷

北京市大兴区九年级数学上学期期末检测试卷

大兴区度第一学期期末检测试卷一、选择题(本题共16分,每小题2分)第1-8题均有四个选项,符合题意的选项只有一个..... 1.若23(0)x y y =≠,则下列比例式一定成立的是 A .23x y = B .32x y= C .23x y =D .32x y= 2.如图,在Rt △ABC 中,∠C =90°,AC =3,BC =4,则sin A 的值为 A .34B .43C .35D .453. 如图,在△ABC 中,点D ,E 分别为边AB ,AC 上的点,且DE ∥BC ,若5AD =,10BD =,3AE =,则AC 的长为 A .3 B .6 C .9 D .12 A.1- B.1C. 6D.95.把抛物线22(3)y x k =-+向下平移1个单位长度后经过点(2,3),则k 的值是A .2B .1C .0D .1-6.如图所示的网格是正方形网格,点A,B,C 都在格点上,则tan ∠BAC 的值为 A . 2B .12C D 7.在平面直角坐标系xOy 中,点A,点B 的位置如图所示,抛物线22y ax ax =-经过A,B ,则下列说法不.正确..的是 A .抛物线的开口向上 B .抛物线的对称轴是1x = C .点B 在抛物线对称轴的左侧D .抛物线的顶点在第四象限8.如图,点A ,B ,C 是⊙O 上的三个点,点D 在BC 的延长线上.有如下四个结论: ①在∠ABC 所对的弧上存在一点E,使得∠BCE =∠DCE ; ②在∠ABC 所对的弧上存在一点E,使得∠BAE =∠AEC ;③在∠ABC 所对的弧上存在一点E,使得EO 平分∠AEC ; ④在∠ABC 所对的弧上任意取一点E (不与点A,C 重合) , ∠DCE=∠ABO +∠AEO 均成立. 上述结论中,所有..正确结论的序号是 A .①②③ B .①③④C .②④ D .①②③④二、填空题(本题共16分,每小题2分)9. 抛物线()212y x =-+的顶点坐标是.10.如图,在□ABCD 中,点E 在DC 上,连接BE 交对角线AC 于点F,若DE :EC =1:3则S △EFC :S △BFA =.11.已知18°的圆心角所对的弧长是5πcm ,则此弧所在圆的半径是cm . 12.如图,⊙O 的半径OA 垂直于弦BC,垂足是D ,OA=5, AD :OD =1:4,则BC 的长为.13.在△ABC 中,tan A =,则sin A =. 14.已知在同一坐标系中,抛物线21y ax =的开口向上,且它的开口比抛物线2232y x =+的开口小,请你写出一个满足条件的a 值:.15.如图,在平面直角坐标系xOy 中,函数(0)ky x x=>的图象经过Rt △OAB 的斜边OA 的中点D ,交AB 于点C .若点B 在x 轴上,点A 的坐标为( 6 , 4 ),则△BOC 的面积为.16.已知抛物线2y ax bx c =++经过A (0,2),B (4,2),对于任意a > 0,点P (m , n )均不在抛物线上.若n >2,则m 的取值范围是__________.三、解答题(本题共68分,第17-22题,每小题5分,第23-26题,每小题6分,第27,28题,每小题7分)解答应写出文字说明、演算步骤或证明过程.17.计算:0sin 60cos30-4tan 45︒⨯︒︒.18.已知:如图,在Rt △ABC 中,∠ACB =90°,CD ⊥AB 于D .(1)求证:△ACD ∽△ABC ; (2)若AD =1,DB =4,求AC 的长.19.下面是小松设计的“做圆的内接等腰直角三角形”的尺规作图过程. 已知:⊙O.求作:⊙O 的内接等腰直角三角形. 作法:如图, ①作直径AB ;②分别以点A, B 为圆心,以大于12AB 的同样长为半径作弧,两弧交于M, N 两点; ③作直线MN 交⊙O 于点C ,D ; ④连接AC ,BC .所以△ABC 就是所求作的三角形. 根据小松设计的尺规作图过程,(1)使用直尺和圆规,补全图形;(保留作图痕迹) (2)完成下面的证明.证明:∵AB 是直径,C 是⊙O 上一点 ∴∠ACB =( ) (填写推理依据) ∵AC=BC ( )(填写推理依据)∴△ABC 是等腰直角三角形.20.已知二次函数2y x bx c =++的图象经过(1,0)和(4 ,-3)两点. 求这个二次函数的表达式.21.如图,△ABC 中,∠A =30°,tan 2B =,AC =BC 的长.22.如图,在测量“河流宽度”的综合与实践活动中,小李同学设计的方案及测量数据如下: 在河对岸边选定一个目标点A ,在近岸取点B ,C ,D (点B ,C ,D 在同一条直线上),AB ⊥BD ,∠ACB =45°,CD =20米,且.若测得∠ADB =25°,请你帮助小李求河的宽度AB.(sin25°≈0.42,cos25°≈0.91,tan25°≈0.47,结果精确到0.1米).23.如图,在平面直角坐标系xOy 中,A (0,3),B (1,0),连接BA ,将线段BA 绕点B 顺时针旋转90°得到线段BC ,反比例函数()0ky x x=>的图象G 经过点C . (1)请直接写出点C 的坐标及k 的值;(2)若点P 在图象G 上,且∠POB =∠BAO ,求点P 的坐标;(3)在(2)的条件下,若Q (0,m )为y 轴正半轴上一点,过点Q 作x 轴的平行线与图象G 交于点M ,与直线OP 交于点N ,若点M 在点N 左侧,结合图象,直接写出m 的取值范围.24.如图,点C 是⊙O 直径AB 上一点,过C 作CD ⊥AB 交⊙O 于点D ,连接DA ,延长BA 至点P ,连接DP ,使∠PDA=∠ADC .(1) 求证:PD 是⊙O 的切线;(2) 若AC =3,4tan 3PDC ∠=,求BC 的长.25.如图,R t △ABC 中,∠C = 90°, P 是CB 边上一动点,连接AP ,作PQ ⊥AP 交AB 于Q .已知AC = 3cm,BC = 6cm,设PC的长度为x cm,BQ的长度为y cm .小青同学根据学习函数的经验对函数y随自变量x的变化而变化的规律进行了探究.下面是小青同学的探究过程,请补充完整:(1)按照下表中自变量x的值进行取点、画图、测量,分别得到了y的几组对应值;(说明:补全表格时,相关数据保留一位小数)m的值约为___________cm;(2)在平面直角坐标系中,描出以补全后的表格中各组数值所对应的点(x,y),画出该函数的图象;(3)结合画出的函数图象,解决问题:①当y>2时,对应的x的取值范围约是_________________;②若点P不与B,C两点重合,是否存在点P,使得BQ=BP?______(填“存在”或“不存在”)26.已知抛物线256y x m x m =--+-+(). (1)求证:该抛物线与x 轴总有交点;(2)若该抛物线与x 轴有一个交点的横坐标大于3且小于5,求m 的取值范围; (3)设抛物线256y x m x m =--+-+()与y 轴交于点M ,若抛物线与x 轴的一个交点关于直线y x =-的对称点恰好是点M ,求m 的值.27.如图,在Rt △ABC 中,∠ABC =90°,AB=BC ,点E 为线段AB 上一动点(不与点A ,B 重合),连接CE ,将∠ACE 的两边CE ,CA 分别绕点C 顺时针旋转90°,得到射线CE ,,CA ,,过点A 作AB 的垂线AD ,分别交射线CE ,,CA ,于点F ,G. (1)依题意补全图形;(2)若∠ACE=α,求∠AFC 的大小(用含α的式子表示); (3)用等式表示线段AE ,AF 与BC 之间的数量关系,并证明.28.对于平面内任意一个角的“夹线圆”,给出如下定义:如果一个圆与这个角的两边都相切,则称这个圆为这个角的“夹线圆”.例如:在平面直角坐标系xOy 中,以点(1,1)为圆心,1为半径的圆是x 轴与y 轴所构成的直角的“夹线圆”.(1)下列各点中,可以作为x 轴与y 轴所构成的直角的“夹线圆”的圆心的点是;A (2,2),B (3,1),C (-1,0),D (1,-1)(2)若⊙P 为y 轴和直线l : y x =所构成的锐角的“夹线圆”,且⊙P 的半径为1,求点P 的坐标.(3)若⊙Q为x轴和直线y x=+所构成的锐角的“夹线圆”,且⊙Q的半径12r≤≤,直接写出点Q横坐标Qx的取值范围.大兴区度第一学期期末检测试卷初三数学答案及评分标准一、选择题(本题共16分,每小题2分)二、填空题(本题共16分,每小题2分)9. ( 1 , 2 );10. 9 : 16;11. 2;12. 6 ;13. 12;14.答案不唯一,例如:5;15. 3; 16. 04m≤≤.三、解答题(本题共68分,第17-22题,每小题5分,第23-26题,每小题6分,第27,28题,每小题7分)解答应写出文字说明、演算步骤或证明过程.171+1⨯………………………3分334=-94=-…………………………………………5分18.(1)证明:∵∠ACB=90°,CD⊥AB于D∴∠ADC=∠ACB=90°∠A=∠A∴△ACD∽△ABC……………………………3分(2)解:∵△ACD∽△ABC,∴………………………………………………4分 ∵AD =1,DB =4, ∴∴ (舍负)…………………………………………5分19. (1)补全的图形如图所示:…………………………2分(2)90°,直径所对的圆周角是直角,线段垂直平分线上的点到线段两个端点的距离相等.…………………………5分20.解:把(1,0),(4 ,-3)代入2y x bx c =++中,101643b c b c ++=⎧⎨++=-⎩………………………………2分 解得:65b c =-⎧⎨=⎩…………………………………… 4分所以,二次函数的表达式为265y x x =-+……………5分21.解:作CD ⊥AB 于点D ……………………………………… 1分∴∠ADC =90°∵∠A =30°, AC =CD ∴=………………………………………… 2分tan CD B BD==∴BD =2………………………………………………… 4分 ∴在Rt △BCD 中,由勾股定理可得 BC =5分22.解:设河宽AB 为x 米……………………………………1分∵AB ⊥BD ∴∠ABC =90° ∵∠ACB =45°AC ADAB AC =15AC AC=AC A∴∠BAC =45° ∴AB =BC =x ∵CD =20∴BD =20+ x ……………………………………2分 ∵在Rt △ABD 中,∠ADB =25°tan2520AB xBD x ∴==+……………………………3分 ()20tan25x x ∴+=20tan251tan25x ∴=-x ≈17.7………………………………4分答:河宽AB 约为17.7米……………………………5分23.解:(1)点C 的坐标(4,1),k 的值是4…………………2分 (2)过O 作OP ∥BC 交4y x=于点P , 由△OAB ∽△OHP 可得,PH :OH=1:3……………………………………………3分 ∵点P 在4y x=上 ∴34P P y y ⋅=P y ∴=∴P…………………………………………4分(3)m >6分 24.(1)证明:连接OD ∵OD =OA ∴∠ODA=∠OAD ∵CD ⊥AB 于点C ∴∠OAD +∠ADC =90°∴∠ODA +∠ADC = 90°……………………………1分 ∵∠PDA =∠ADC ∴∠PDA +∠ODA =90° 即∠PDO =90°),(33232B∴PD ⊥OD …………………………………2分 ∵D 在⊙O 上∴PD 是⊙O 的切线…………………………………3分(2)解: ∵∠PDO =90° ∴∠PDC +∠CDO =90° ∵CD ⊥AB 于点C ∴∠DOC +∠CDO =90°∴∠PDC =∠DOC …………………………………4分4tan 3PDC ∠= 4tan 3DOC ∴∠=设DC =4x ,CO =3x ,则OD =5x ∵AC =3 ∴OA =3x+3 ∴3x+3=5x ∴x =32∴OC=3x=92, OD=OB=5x =152…………………………………5分 ∴BC=12…………………………………………6分25.(1)m 的值约为 2.6 ;…………………………………2分(2)函数图象……………………………4分(3)①当y>2时,对应的x 的取值范围约是0.8<x <3.5;………………………5分 ②不存在. ………………………………………………6分26.(1)证明:()222454670b acm m m ∆=-=(-)+(-)=-≥所以方程总有两个实数根. ……………………………………2分(2)解:由(1)()27m ∆=-,根据求根公式可知,方程的两根为:2x =-即1216x x m =-=-+,由题意,有 365 <-m < +13 < m ∴<…………………………………………………4分(3)解:令x =0,y =6m -+∴ M (0,6m -+)由(2)可知抛物线与x 轴的交点为(-1,0)和(6m -+,0), 它们关于直线的对称点分别为(0, 1)和(0,6m -), 由题意,可得:6166m m m -+=-+=-或56m m ∴==或……….……………………………6分27.(1)补全的图形如图所示.…………………………1分(2)解:由题意可知,∠ECF=∠ACG=90°∴∠FCG=∠ACE=α∵过点A 作AB 的垂线ADy x =-∴∠BAD=90°∵AB=BC,∠ABC =90°,∴∠ACB=∠CAD= 45°∵∠ACG=90°∴∠AGC=45°∴∠AFC =α+45°…………………………………3分(3)AE ,AF 与BC 之间的数量关系为2AE AF BC +=…………4分证明:由(2)可知∠DAC=∠AGC=45°∴CA=CG ……………………………………5分 ∵∠ACE =∠GCF ,∠CAE =∠CGF∴△ACE ≌△GCF ………………………………………6分∴AE =FG .在Rt △ACG 中,∴AG =∴AE AF +=∵AC =∴2AE AF BC +=…………………………………………7分28.解:(1)A , D ……………………………………………………2分(2)如图:过P 点作PA ⊥y 轴于点A ,PB ⊥l 于B ,连PO .∵点B为直线y x =上一点 ∴设B 点坐标为(x,3x )设直线3y x =与x 轴夹角为αtan α=∴直线l 与x 轴的夹角为30°……………………………3分 ∴∠AOB =60°又∵⊙P 与x 轴及直线OB 均相切,∴OP 平分∠AOB∴∠AOP =30°又∵AP =1∴P 点坐标为(…………………………………………………4分同理,当P 点在第三象限时,P 点坐标为(1,-………………5分(3)24810Q Q -x x ≤≤≤≤+7分。

北京市大兴区九年级数学上学期期末试卷

北京市大兴区九年级数学上学期期末试卷

北京市大兴区九年级数学上学期期末试卷初三数学第Ⅰ卷 (选择题 共32分)一、选择题(共8小题,每小题4分,共32分)在下列各题的四个备选答案中,只有一个是正确的.1. 如图,在⊙O 中,∠BOC =100°,则∠A 等于A 、100°B 、50°C 、40°D 、25°2. 在ABC ∆中,,1312sin ,900==∠A C 则A tan 的值为 A 、1312 B 、135 C 、512 D 、12133.在同一平面内,过已知A 、B 、C 三个点可以作圆的个数为A 、0个B 、1个C 、2个D 、0个或1个4. 二次函数21y x =-+的图象与x 轴交于A 、B 两点,与y 轴相交于点C .下列说法中,错误..的是 A 、ABC △是等腰三角形 B 、点C 的坐标是()01, C 、AB 的长为2D 、y 随x 的增大而减小5.在Rt △ABC 中,∠C=90°,∠B=35°,AB=7,则BC 的长为 A 、7sin35° B 、35cos 7C 、7cos35°D 、7tan35°6. 小明要给小林打电话,他只记住了电话号码的前5位的顺序,后3位是3,6,8三个数字的某一种排列顺序,但具体顺序忘记了,那么小明第一次就拨通电话的概率是 A 、121 B 、61 C 、41 D 、31 7.二次函数c bx ax y ++=2的图象如图所示,则一次函数a bx y +=的 图象不经过 A 、第一象限 B 、第二象限C 、第三象限D 、第四象限8.已知:如图,点P 是正方形ABCD 的对角线AC 上的一个动点(A 、C_Fx y0 AxyDx y 0Byx 0CyxODCB (4,4)A (1,4)除外),作AB PE ⊥于点E ,作BC PF ⊥于点F ,设正方形ABCD 的边长为x ,矩形PEBF 的周长为y ,在下列图象中,大致表示y 与x 之间的函数关系的是第Ⅱ卷 (非选择题 共88分)二、填空题(共4小题,每小题4分,共16分)9.如图,AB 是⊙O 的弦,半径OA =2,∠AOB =120°,则弦AB 的长是 .(第9题) (第10题) (第12题) 10. 如图是一张直角三角形的纸片,直角边AC =6 cm , tanB=43,现将△ABC 折叠,使点B 与点A 重合,折痕为DE ,则DE 的长为 .11. 盒中有x 个白球和y 个黑球,从盒中随机取出一个球,取得白球的概率是2.如再往盒中放进3个黑球,取得白球的概率变为14,则原来盒里有白球 个. 12. 如图,点A ,B 的坐标分别为(1, 4)和(4, 4),抛物线n m x a y +-=2)(的顶点在线段AB 上运动,与x 轴交于C 、D 两点(C 在D 的左侧),点C 的横坐标最小值为3-,则点D 的横坐标最大值为 . 三、解答题(本题共30分,每小题5分) 13.O+︒-︒30tan 345cos 260sin .ABCDE14. 点P(1,a )在反比例函数xky =的图象上,点P 关于y 轴的对称点在一次函数42+=x y 的图象上,求此反比例函数的解析式。

北京市大兴区九年级(上)期末英语试卷(含答案)

北京市大兴区九年级(上)期末英语试卷(含答案)

九年级(上)期末英语试卷一、单选题(本大题共10小题,共10.0分)1.I usually set ______goals at the beginning of each term.()A. IB. meC. myD. mine2.-Are you familiar _______the movie,Melissa?-Yes,I've watched it twice.()A. forB. withC. ofD. at3.________it is raining heavily,we have to stay indoors at school.()A. As soon asB. SinceC. ThoughD. Unless4.An e-book is usually much______ than an ordinary paper book.()A. more expensiveB. the most expensiveC. most expensiveD. expensive5.-Eric,_____you talk about the history of China's space programme?-Sure.Let me show you some photos first.()A. mustB. needC. mayD. can6.Look!Betty and Bruce _________in the art room.()A. are paintingB. will paintC. have paintedD. painted7.If you _______up late,you will feel tired the next day.()A. will stayB. have stayedC. stayD. were staying8.Mr.King asks us _______ a car with our friends to school.()A. organizingB. organizedC. organizeD. to organize9.The lights in my room _______off when I left yesterday morning.()A. turnB. turnedC. are turnedD. were turned10.-Do you know ______________ at that time last night?-Yes,a report for a newspaper.()A. what was Linda writingB. what will Linda writeC. what Linda was writingD. what Linda will write二、完形填空(本大题共10小题,共15.0分)Maddy Cullen became a heroine last month.Thanks to her quick thinking,she and Dave Lewis were saved from danger in the(31)______.Maddy and Dave went to the Scottish Highlands with a group from the Music Now Festival.In the afternoon,the group went(32)______on the lake,but Maddy and Dave went hang-glider (滑翔)instead.Unfortunately,above the famous lake Loch Ness,the hang-glider flew into a sudden storm and knocked on a mountain out of(33)______.Both Maddy and Dave jumped off the hang-glider before it crashed down(坠毁).They dropped safely in the mountains.But Dave couldn't walk because his right leg was badly injured.He and Maddy had to stay in the mountains and waited for rescuers.They had no food or water,so they were hungry,thirsty and(34)______.They felt very worried before the sun set.Then Maddy had a very good idea.She collected many stones and formed a large sign"SOS"on the ground so that pilots in the helicopter could find them(35)______.Meanwhile,group leader Rob Townsend was also worried when he found Maddy and Dave didn't sail with them.There were no public(36)______anywhere nearby.He had to walk a long way to call the police to look for the missing teenagers.A few minutes later,a policehelicopter flew over Loch Ness,and the pilot saw Maddy's message from above easily.Dave and Maddy were(37)______ up and flown to hospital in Inverness quickly.A week ago,Maddy spoke to a reporter from the newspaper."We were very(38)______when the helicopter arrived,"she said."The police told Dave not to move and they carried him into the helicopter.They asked us to put on dry clothes and(39)______ some hot soup to us.They were great.""It was all because of me,"Dave said."Rob told us to wear walking boots,and he told us not to leave the group.But I did not listen.I was very silly."The police(40)______.On its radio news,they asked walkers in the Highlands to follow instructions carefully and not to take any adventures.11. A. forest B. sea C. mountains D. lake12. A. sailing B. fishing C. skating D. swimming13. A. sight B. trouble C. control D. date14. A. alone B. sad C. calm D. cold15. A. silently B. easily C. simply D. carefully16. A. telephones B. libraries C. websites D. bicycles17. A. given B. put C. woken D. picked18. A. excited B. confused C. frustrated D. scared19. A. shared B. offered C. cooked D. provided20. A. insisted B. agreed C. considered D. suggested.三、阅读理解(本大题共15小题,共30.0分)AA. New YorkB. BeijingC. TorontoD. Moscow22.How long does the play last?______A. An hour.B. One and a half hours.C. Two hours.D. Two and a half hours.23.What can be known from the play?______A. The types of ancient houses.B. Chinese traditional festivals.C. Chinese history and culture.D. The art of Chinese painting.BDo you want to spend a holiday in space?Dennis Tito,a businessman,has become the world's first"space tourist".He went on a 10-day visit to the International Space Station.He paid 14million pounds for his journey.A year later,Martin,a musician from an American band,wanted to do the same.He was only 22years old and probably very rich too.He had to go for a lot of training to see whether he was fit enough to travel.He is still waiting for his holiday of a lifetime.Many people believe that this is only the start of something new.We made interviews among teenagers from around the world and the following is what they said about space travel."It's a great idea.I hope space travel will be common in about 50years'time.I'd really love to do it and I think Mr.Tito was very lucky."(Kate from Australia)"I would like to see our beautiful Earth from space.There are lots of secrets to explore in space and I would go into space if I could."(Ben from China)"I think space travel is really bad for the environment.Maybe in the future they will make a cleaner way of travelling but until they do,I don't want to go.We should look after our own planet first."(Richard from Canada)"It must be very boring and dangerous to sit in that small space shuttle(舱).I'd rather take a plane and go to another place on earth."(Lisa from the UK)So,as you can see,many of our teenagers had different opinions.Whether you like it or not,space travel is going to become an important thing in the future.We are looking forward to hearing your opinions.24.What can we know about Dennis and Martin?______A. Dennis spent a lot of money travelling on the earth.B. Martin was a musician from an American band.C. Martin couldn't afford to go on training in the center.D. Dennis is developing a space journey to do business.25.Ben supports the position that______.A. we will explore in space and discover its secretsB. we would rather travel on the earth than in spaceC. all of us can make a space travel in about 50yearsD. we will take actions and look after the earth first26.What does the writer ask us to do?______A. To show respect for Dennis and Martin.B. To collect information about astronauts.C. To share our opinions about space travel.D. To get along well with space scientists.27.Which of the following is TRUE according to the passage?______A. It's an honor for Dennis and his teammates to create a new spaceship.B. The teenagers are having a prediction about the school life in the future.C. Dennis entered the International Space Station and stayed for ten days.D. Martin is busy training hard and getting ready for his space travel now.CSarasota,Florida teen band The Garbage-Men is performing on the stage.The band has five members.They are Jack Berry,Ollie Gray,Harrison Paparatto,Austin Siegel and Evan Tucker.The five teens are making music from waste.The Garbage-Men band's instruments are made from recycled things.The guitars are boxes.A horn(号)is made from pipes.The keyboard is formed from old bottles.The band started about two years ago.Jack Berry who was in eighth grade at the time decided to make a playable,home-made guitar,after some trial-and-error(反复试验),he ended up building it from a cereal box,a yardstick and toothpicks.After Jack showed his creation to his friend Ollie Gray,Ollie had the idea to form a band using other home-made instruments as a way to improve recycling."We want to show people there is more to recycling than throwing things away in the bin."Jack,16,told TFK."You can actually reuse materials."The Garbage-Men plays at local events around Sarasota,including festivals,farmer's markets and community fundraisers.Typically,the teens will set up on the street and perform popular songs from the 1960s,including classic Beatles tunes and crowd favorite"Wipe Out,"by The Surfaris.In between sets,they talk about recycling and offer tips for how to help the environment.While they perform,Jack's little brother Trent,11,gives out flyers(宣传单)about recycling and helps sell the band's CDs and other musical products.The band donates(捐赠)the money from sales to charity.They have raised more than $2,500for Heifer International.The organization gives farm animals,seeds and agricultural(农业的)training to people in poor countries to help end poverty and hunger."It's a good,sustainable-development (持续发展的)charity,"Jack says,"By donating one animal,you help the whole community."The band,all tenth graders,tries to play a show every week.They've also played on a Tampa,Florida radio station and auditioned(试演)for America's Got Talent.The teens hope to eventually take their shows on the road by touring in other states."Music is a really good way to get a good message across to people because it's really accessible(可接近的),"Jack says.Their instruments may be rubbish,but their message isn't.28.Who is NOT a member of the Garbage-Men band?______A. Ollie Gray.B. Trent Berry.C. Austin Siegel.D. Jack Berry.29.The five teens formed the band in order to______.A. show how to make musical instruments from rubbishB. earn more money to help support their own familiesC. make their musical products known all around the worldD. ask more people to recycle daily rubbish around them30.What did the Garbage Men Band mainly do according to the passage?______A. They told people how to protect the environment and do some charities.B. They collected the rubbish in communities and cleaned up the markets.C. They raised money for the old people by selling their own instruments.D. They joined the Heifer International and made their own musical CDs.31.What's the best title for the passage?______A. Music and EnvironmentB. The Garbage-Men BandC. Home-made Musical InstrumentsD. A Pioneer of American Country Music.DAccording to a new scientific research,we are rapidly going close to major climate change and the effects on the environment could be quite serious.Geographers predict that climate zones could completely disappear within the next eighty years.Where will crops be grown if this happens?When the climate changes a lot,polar regions will get colder and tropical regions will get even hotter.As a result,where will animals be forced to move on the earth?Climate changes like these could lead to the spread of diseases.Tropical storms and hurricanes (飓风)will not only increase but may also become stronger.If the changes come too quickly,animals and plants may not be able to adapt(适应)right away and could disappear from the earth.According to Science Daily,a new study predicts that,by the year 2100,many of today's familiar climates will be taken place by climate unknown in today's world.It is urgent that we reduce the risks of far-reaching results for the whole world.The planet itself has been showing signs of change.In 2004,a huge tsunami created by a major earthquake killed thousands in Sumatra and in 2008,thousands more died in China in another big earthquake.Egypt was hit in 2009with a major earthquake and Haiti was destroyed seriously and became ruins in 2010by another big earthquake.Not long ago,scientists discovered ice melting(融化)in west Antarctica(南极洲).This is very worrying because temperatures in this area have remained rather constant(不断的)and actually even lower at time.Melting occurs when temperatures increase and since temperatures have remained,the ice should not be melting.However,satellite data(数据)shows melting around west Antarctica.Within just the last few months,new reports from around the world have been coming in and most agree that our climate situation is much worse than previously expected.At this point,it doesn't matter what is causing it,but rather,what can be done about it.On the other hand,our world is getting more and more unstable(不稳定)every year.Natural disasters(灾难)are becoming more frequent(频繁的)and serious.However,other planets are experiencing global warming as well as our own and some scientists believe there may be some connections between these.No one knows anything for sure at this point because there is simply not enough data.32.What's the writer's attitude toward the climate changes?______A. We should observe the great changes of the climate carefully.B. We must connect with other planets to prevent the climate changes.C. We should try our best to do something against the climate changes.D. We need to discover what causes the climate changes first of all.33.What does the underlined word"tropical"mean?______A. cold and dryB. cool and wetC. hot and wetD. warm and dry34.What can be inferred from the passage?______A. Collecting more data will help us to solve the problem.B. The climate will be much better than we have expected.C. Earthquakes can be avoided in a few years'time.D. The ice in west Antarctica will stop melting in the future.35.What's the passage mainly about?______A. It tells us how to protect the environment of the earth.B. It talks about the bad effects of the climate changes.C. It shows us how to prevent diseases from spreading.D. It describes what we should do with the earthquakes.四、阅读填空(本大题共1小题,共10.0分)36.On June 26th,2000,two scientists,called Francis Collins and Craig Venter,told the world that they could now read the whole"map"of the human body:DNA.DNA is something that all humans have,and it tells the body what to do.DNA is the reason that we look like our mother and fat her,because we get some of their DNA to make our own.Now we can read some of this"m ap",and so we can find out more about how our bodies work.People have been trying to understand the human body for a long time.In 1860,Gregory Mendel discovered that there is a special reason why we look the same as other people in our family.It is because of small things called"genes"that we have in our bod y.In 1953,James Watson and Francis Crick made another discovery and found out that those small parts are really messages written in the DNA with a special language.In 1961,Marshall Nirenberg and Johann Matthaei found the first"word"that they could understand in that language,showing how DNA tells the cell to build its parts.This meant that one day we would be able to read all the messages that a human body gets from its parents'bodies.Scientists have now found all the words in DNA map,but we still do not understand what they all do.By understanding what just one"word"means,we can help save people from several diseases.So the more we understand,the more doctors will be able to do.Most people hope that this will help to make better medicine and help people who are ve ry ill.Other people worry about that when we learn more words and find out lots of oth er information,we still use it in the wrong way,just to make people more attractive,or stop sick people getting jobs.61.Could Francis and Craig read the"map"of DNA in 2000?______62.Why do we look like our parents?______63.When was the first"word"of DNA discovered?______64.What can the doctors do if we understand some messages in DNA?______65.What does the writer tell us in the last paragraph?______.五、完成句子(本大题共1小题,共10.0分)37.Planes have changed the world in the last hundred years.But this great change began withtwo ordinary people.Orville and Wilbur Wright were two brothers.(56)______.They were good at making bicycles,but planes were their real interest.At that time,people knew how to build and fly gliders.But nobody could build a plane with an engine and fly it.The plane builders had two main problems:(57)______.And the planes always crashed when they tried to take off.The Wright brothers read about these problems in newspaper,and they decided to look for answers.They made small model planes in the bicycle shop and they built a wind tunnel (风道)to test the models.They also built real gliders.(58)______.On December17th,1903,Orville and Wilbur pulled The Flyer onto a flat sandybeach.The plane weighted 275kilograms.It had a petrol engine and two woodenpropellers(螺旋桨).Two bicycle chains connected the propellers to the engine.(59)______.The brothers threw a coin into the air to see who should fly first.Orville won.He climbed onto the plane and started the engine.(60)______.Wilbur ran along beside the plane.And then the plane took off!It flew for六、书面表达(本大题共1小题,共15.0分)38.假如你叫李华,你的笔友Peter想了解你日常生活中的榜样.请你以"A Role Model in My Daily Life."为主题,给他写一封邮件,告诉他你日常生活中的榜样是谁,做了哪些令你敬佩的事情,并谈谈你的体会与感受.提示词语:role model,set,example,help,learn,hope…答案和解析1.【答案】C【解析】答案:C.考查物主代词.句意:我通常在每学期开始时设定我的目标.根据题干I usually set ______goals at the beginning of each term.可知空后有名词goals,所以用形容词性物主代词my.故选C.我通常在每学期开始时设定我的目标.理解各个选项的含义,仔细分析句子的结构,掌握一些固定用法,根据具体内容作答.2.【答案】B【解析】答案:B.考查介词.A为了.B和.C属于.D在几点或小地点.be familiar with 熟悉某人、某物.固定搭配.选B.--你熟悉这部电影吗,梅利莎?--是的,我看过两次了.考查介词用法,这个知识点很广泛,有一些固定用法,需要日常积累,结合语境选择正确介词完成习题.3.【答案】B【解析】答案:BAs soon as"一…就…",Since"由于,既然",Though"尽管,即使",Unless"除非",根据句意可知,此处是since引导原因状语从句,故答案为B.由于雨下得很大,我们只好在学校里呆在室内.做单项选择填空的技巧是:排除比较法.根据上下文意思或时间状语,推断出合适的时态,排除错误的答案,然后再比较剩下的选择项,从而做出正确的答案.4.【答案】A【解析】答案:A 分析句子,结合选项,推测意思是电子书比一般普通的纸质书要贵得多.后面than是比较级的标志,故选A更贵的.电子书比一般普通的纸质书要贵得多.解答这类试题时,务必充分理解上下文的语境和前后文的逻辑关系,找到解题的依据,同时正确区分选项的细微差别,准确作答.5.【答案】D【解析】答案:D 分析句子,结合选项,推测意思是埃里克,你能谈谈中国的太空计划的历史吗?当然,让我先给你看一些照片.故选D能,可以.A必须,B需要,C或许,可能.埃里克,你能谈谈中国的太空计划的历史吗?当然,让我先给你看一些照片.解答这类试题时,务必充分理解上下文的语境和前后文的逻辑关系,找到解题的依据,同时正确区分选项的细微差别,准确作答.6.【答案】A【解析】答案:A 分析句子,结合选项,推测意思是看,贝蒂和布鲁斯正在艺术室里画画.这里表示正在进行的动作,用现在进行时,结构是am/is/are doing,主语是复数,故选A.看,贝蒂和布鲁斯正在艺术室里画画.解答这类试题时,务必充分理解上下文的语境和前后文的逻辑关系,找到解题的依据,同时正确区分选项的细微差别,准确作答.7.【答案】C【解析】答案:C.根据If you _______up late,you will feel tired the next day,可知if引导的条件状语从句,主句用一般将来时态,从句用一般现在时态.故选C.如果你熬夜到很晚,第二天你就会感到疲倦.一般现在时态通常表示习惯性动作或客观事实,注意一些时间状语用法,结合语境,完成试题.8.【答案】D【解析】答案:D.根据Mr.King asks us _______ a car with our friends to school,可知句子考查ask sb to do sth表示要求某人做某事.故选D.金先生让我们和朋友们一起去学校开车.本题考查不定式短语的及固定短语的用法,根据句意和语境,从而判断出正确答案.9.【答案】D【解析】答案:D.根据The lights in my room _______off when I left yesterday morning,这里 yesterday morning用于一般过去时,而主语lights表示动作的承受者,这里用一般过去时的被动语态,构成were/was+动词的过去分词.故选D.我昨天早上离开时,房间里的灯都关了.做单项选择填空的技巧是:排除比较法.即利用上下文的时间状语,推断出合适的时态,排除错误的答案,然后再比较剩下的选择项,从而做出正确的答案.10.【答案】C【解析】答案:C.根据Do you know 再结合选项,可知Do you know 后面是跟一个宾语从句,宾语从句中应该用陈述语序,即主语+谓语,选项AB是疑问句语序,排除,从at that time last night判断句子使用过去进行时.故选:C.--你知道昨晚琳达在写什么吗?--是的,为一份报纸写一篇报道.本题主要考查宾语从句,一定要注意宾语从句的引导词,以及宾语从句的时态和语序问题.把握好这几点,是做好此类题目的关键!11.【答案】【小题1】C 【小题2】A 【小题3】C 【小题4】D 【小题5】B【小题6】A 【小题7】D 【小题8】A 【小题9】B 【小题10】B【解析】31.答案:C.考查名词.句意:由于她的敏捷的思维,她和戴夫•刘易斯在__里免于危险.A.forest森林;B.sea海;C.mountains山;D.lake湖泊.根据第四行They dropped safely in the mountains他们安全地落山上了.可知选C.32.答案:A.考查动词.句意:在下午,这个组去湖上__.A.sailing航行;B.fishing钓鱼;C.skating滑冰;D.swimming游泳.根据on the lake在湖上.可知选A.33.答案:C.考查名词.句意:不幸的是著名的尼斯湖湖上方,悬挂式滑翔机飞进突如其来的风暴,失去__撞上了一座山.A.sight 视力;景象;眼界;B.trouble麻烦;烦恼;故障;C.control 控制;管理;抑制;D.date 日期;约会;年代;枣椰子.out of control失去控制.结合句意,可知选C.34.答案:D.考查形容词.句意:他们没有食物和水,所以他们又渴又饿又___.A.alone独自的(地);B.sad难过的;悲哀的,令人悲痛的;C.calm静的,平静的;沉着的;D.cold寒冷的;冷淡的,不热情的;失去知觉的.根据句意和语境,可知选D.35.答案:B.考查副词.句意:她收集了许多石头并且在地面形成了一个大招牌"SOS",直升机的飞行员可以很___找到它们.A.silently默默地;静静地;B.easily容易地;无疑地;C.simply简单地;仅仅;简直;朴素地;坦白地;D.carefully小心地.根据句意和语境可知,摆SOS是为了"容易"找到他们.选B.36.答案:A.考查名词.句意:附近的任何地方没有公用___.A.telephones 电话;B.libraries 图书馆;C.websites网站;D.bicycles 自行车;脚踏车.根据下文He had to walk a long way to call the police to look for the missing teenagers他不得不走很远的路叫警察去寻找失踪的青少年.和句意可知,应该是"电话".选A.37.答案:D.考查动词.句意:戴夫和曼迪被___,空运到因弗内斯的医院.A.given给;give up:放弃;B.put放,put up树立,搭建;C.woken醒来,wake up醒来;D.picked捡,挑选,采摘,pick up捡起;获得;收拾;(汽车;飞机)乘载.结合句意和语境可知,应该是pick up"接载"选D.38.答案:A.考查动词.句意:当直升机到达时,我们非常__.A.excited 兴奋的;激动的;B.confused 困惑的;混乱的;糊涂的;C.frustrated失意的,挫败的;泄气的;D.scared 害怕的.结合句意可知,终于获救了,应该是"激动的",选A.39.答案:B.考查动词.句意:他们要求我们穿上干燥的衣服,给我们__了一些热汤.他们是极好的.A.shared共享;B.offered提供,提议;C.cooked煮;D.provided提供;给予.Offer sth.to sb.:把某物提供给某人.结合句意可知选B.40.答案:B.考查动词.句意:警方___,在广播新闻,他们让步行者在高地仔细按照指示,不采取任何冒险.A.insisted坚持;B.agreed同意;C.considered 考虑;D.suggested建议.根据上一句he told us not to leave the group.But I did not listen.I was very silly他告诉我们不要离开这个团体,但我不听,我很傻.可知,出事故了,警方应该是同意这种说法.选B.文章大意:这是一篇记叙文,本文主要介绍了麦迪•卡伦和戴夫•刘易斯去旅行.他们跟了旅行团,他们去悬挂式滑翔机飞行,其他人去湖上航行.而麦迪•卡伦和戴夫•刘易斯悬挂式滑翔机飞进风暴,失去控制撞上了一座山.麦迪•卡伦想了一个好主意.她收集了许多石头并且在地面形成了一个大招牌"SOS",直升机的飞行员可以很容易找到它们.最终他们获救了.完形填空题型,抓住文章的大意,挑出信息词.同时凭借自己掌握的语法知识和一般的常识,兼顾人称、性别、单复数、语法和时态等等语法的因素,从语法的结构方面考虑答案.细心检查,避免疏漏.21.【答案】【小题1】A 【小题2】D 【小题3】C【解析】答案:41.A 细节理解题.根据第一行句子The New York State Theater.可知在纽约.故选A.42.D 细节理解题.根据第三行句子Showing time:8:00a.m.-10:30a.m.Saturday,November 5;3:00p.m.-5:30p.m.Sunday,November 6.可知两个半小时.故选D.43.C 细节理解题.根据整篇文章内容及其倒数第三行句子Anyone who isinterested in Chinese life and history should see the play.任何对中国生活和历史感兴趣的人都应该去看这部戏剧.可知中国的历史和文化.故选C.本文主要是老舍的《茶馆》将在纽约大剧院演出的广告.介绍了演出时间和剧情及呼吁大家赶快订票.在通读全文的基础上,根据全文大意,展开逻辑思维,瞻前顾后,认真观察选项,仔细推敲,确定最佳答案.24.【答案】【小题1】B 【小题2】A 【小题3】C 【小题4】D【解析】44.B 细节理解题,根据"Martin,a musician from an American band,wanted to do the same"可知,马丁是一个美国乐队的音乐家.故答案为B.45.A 细节理解题,根据""I would like to see our beautiful Earth from space.There are lots of secrets to e xplore in space and I would go into space if I could."(Ben from China)"可知,本支持我们将在太空探索并发现它的秘密.故答案为A.46.C 细节理解题,根据"We are looking forward to hearing your opinions."可知,作者要求我们分享我们对太空旅行的看法.故答案为C.47.D 细节理解题,根据"A year later,Martin,a musician from an American band,wanted to do the same.He was only 22years old and probably very rich too.He h ad to go for a lot of training to see whether he was fit enough to travel.He is still waiting for his holiday of a lifetime."可知,马丁现在正忙于刻苦训练,为他的太空旅行做准备.故答案为D.文章大意:丹尼斯去太空旅游之后,一个美国音乐家马丁,也想去太空旅游.作者就这件事采访了一些青少年.阅读理解的做题技巧:先浏览所给的问题以及选择项,然后带着问题在通读原文的基础上快速地找到答案,然后再回过头来检查一遍,确保万无一失.还有,最好把答案所在的句子划出来,以便回来检查时更加的省时省力.28.【答案】【小题1】B 【小题2】D 【小题3】A 【小题4】B【解析】48.B 细节理解题,根据第一段的"The band has five members.They are Jack Berry,Ollie Gray,Harrison Paparatto,Austin Siegel and Evan Tucker."可知,乐队由五个成员组成,分别是Jack Berry,Ollie Gray,Harrison Paparatto,Austin Siegel和 Evan Tucker,没有Trent Berry.故答案为B.49.D 细节理解题,根据第二段的""We want to show people there is more to recycling than throwing things away i n the bin."Jack,16,told TFK."You can actually reuse materials.""可知,这五个十几岁的少年组成了乐队,为了呼吁人们利用身边的废弃物.故答案为D.50.A 细节理解题,根据第三段的"In between sets,they talk about recycling and offer tips for how to help the environment"和第四段的"The band donates(捐赠) the money from sales to charity.They have raised more than $2,500for Heifer International."可知,Garbage Men乐队主要告诉人们如何保护环境和做一些慈善活动.故答案为A.51.B 主旨大意题,A音乐和环境,B垃圾工人乐队,C自己做的乐器,D美国乡村音乐的先驱;通读全文可知,本文主要介绍倡导环保的"垃圾工人乐队".故答案为B.文章大意:本文介绍了The Garbage-Men乐队的成员用废弃的物品做乐器,呼吁大家保护环境,把营业收入的一部分用于慈善.阅读理解的做题技巧:先浏览所给的问题以及选择项,然后带着问题在通读原文的基础上快速地找到答案,然后再回过头来检查一遍,确保万无一失.还有,最好把答案所在的句子划出来,以便回来检查时更加的省时省力.32.【答案】【小题1】C 【小题2】C 【小题3】A 【小题4】B【解析】52.C,细节理解题,At this point,it doesn't matter what is causing it,but rather,what can be done about it.我们现在不应该关注气候变化产生了什么,应该努力去想办法解决气候变化的问题,选择C.53.C,细节理解题, get even hotter气候变化之后会更热,由此可知是本来就热的地方,选择C.54.A,细节理解题,No one knows anything for sure at this point because there is simply not enough d ata由于现在数据不足,没有人知道会发生什么,由此可知是数据量足够的话就有可能改变现状,选择A.55.B,主旨大意题,文章首句提到According to a new scientific research,we are rapidly going close to major climate change and the effects on the environ ment could be quite serious气候变化很迅速,我们生活的环境会更加的糟糕,下文也主要讲述的是气候变化的影响,选择B.文章大意文章主要讲述的是有关于气候变化的事情.现在气候变化很明显,已经切实的影响到了我们的生活,比如汶川大地震等,我们现在应该努力寻找更多的数据,尽力解决气候变化的问题.对于阅读表达题,一定要记得首先通读全文,了解文章大意,然后再根据文章关键词,关键句,掌握细节问题,并进行推理判断,再去回答具体的问题.36.【答案】Yes,they could.;Because we get some of their DNA to make our own.;In 1961.;The doctors can save patients from several diseases.;People are having a debate about DNA【解析】答案:61.Yes,they could.细节理解题.根据第一段句子On June 26th,2000,two scientists,called Francis Collins and Craig Venter,told the world that they could now read the whole"map"of the human body2000年6月26日,两位科学家,弗兰克斯.柯林斯和克莱格.温特,向外界宣告他们已经完全破译了"人体地图":可知他们已经完全破译了"人体地图".故答案为Yes,they could.62.Because we get some of their DNA to make our own.细节理解题.根据第一段第二行句子DNA is the reason that we look like our mother and father,because we get some of their DNA to make our own.DNA是我们长的像父母的原因,因为我们从父母那里遗传到一部分他们的DNA.可知因为我们从父母那里遗传到一部分他们的DNA.故答案为Because we get some of their DNA to make our own.63.In 1961.细节理解题.根据第三段句子In 1961,Marshall Nirenberg and Johann Matthaei found the first"word"that they could understand in that language,1961年,马歇尔.尼日伯格和约翰.马萨尔发现遗传微粒携带的信息显示出遗传微粒是怎么样指导细胞生成的.可知在1961年发现的.故答案为In 1961.64.The doctors can save patients from several diseases.细节理解题.根据第三段句子we can help save people from several diseases.So the more we understand,the more doctors will be able to do.我们可以帮助人们避免多种疾病.所以我们越了解,医生就能做的越多.可知医生们可以把病人从几种疾病中拯救出来.故答案为The doctors can save patients from several diseases.65.People are having a debate about DNA.细节理解题.根据最后一段内容及其句子Most people hope that this will help to make better medicine and help people who are very ill.Other people worry about that when we learn more wordsand find out lots of other information大多数人希望这将有助于制造更好的药物救治生病的人.另一些人担心这可能会带来一些不好的结果.可知说的是人们正在就DNA进行辩论.故答案为People are having a debate about DNA.短文介绍了科学家对DNA的研究历程.大多数人希望这将有助于制造更好的药物救治生病的人.其也有人担心这可能会带来一些不好的结果.做题时首先对原文材料迅速浏览,掌握全文的主旨大意.其次,细读题材,各个击破.掌握全文的大意之后,细细阅读材料后的问题,弄清每题要求后,带着问题,再回到原文中去寻找、捕获有关信息.37.【答案】【小题1】D【小题2】C【小题3】B【小题4】A【小题5】E【解析】答案:56.D 细节推理题.根据下文They were good at making bicycles,他们擅长制造自行车.可知结合选项,应说他们在美国俄亥俄州有一家自行车商店.故选D.57.C 细节推理题.根据上文The plane builders had two main problems飞机制造有两个主要问题.可知结合选项,应说他们的机翼没有足够的坚固.故选C.58.B 细节推理题.根据上文They made small model planes in the bicycle shop and they built a wind tunnel(风道)to test the models.They also built real gliders.他们在自行车店做了小型模型飞机,他们建造了一个风洞来测试模型.他们还建造了真正的滑翔机.可知结合选项,应说最后,他们用一个叫做。

北京市大兴区九年级上学期期末检测英语试题(含答案)

北京市大兴区九年级上学期期末检测英语试题(含答案)

第一学期期末检测试卷初三英语知识运用(共14分)一、单项填空(共6分, 每小题0.5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。

1. 1 usually set ___________goals at the beginning of each term.A. IB. meC. myD. mine2. -Are you familiar ___________the movie, Melissa?-Yes, I've watched it twice.A. forB. withC. OfD. at3. ___________it is raining heavily, we have to stay indoors.A. UnlessB. Even ifC. ThoughD. Since4. Yao Ming is one of ___________basketball players in the world.A. the tallestB. tallestC. tallerD. tall5. -______________ you help me take out the waste in the kitchen, Jenny?-Yes, of course.A. MayB. MustC. CanD. Should6. If you stay up late, you ___________tired tomorrow.A. feelB. feltC. have feltD. will feel7. Peter fell asleep and ___________to set his alarm for the next morning.A. forgetsB. forgotC. will forgetD. has forgotten8. While Alice ___________against the cold wind, she covered her face with a scarf.A. was walkingB. is walkingC. walksD. will walk9. Jack ___________a few discoveries in chemistry since he became a scientist.A. is makingB. will makeC. madeD. has made10. Mr. King always asks us ___________a car pool with our friends to school.A. organizingB. organizedC. to organizeD. organize11. Young trees ___________in the city every spring.A. are plantedB. were plantedC. plantD. planted12. -Alice, could you tell me ___________the book?-Oh, yes. I bought it from a bookstore online.A. where did you buyB. where you boughtC. where will you buyD. where you will buy二、完形填空(共8分, 每小题1分)阅读下面的短文, 掌握其大意, 然后从短文后各题所给的A,B,C,D四个选项中, 选择最佳选项。

北京市大兴区2013~2014学年九年级第一学期期末检测-化学试卷-含答案与评分标准

北京市大兴区2013~2014学年九年级第一学期期末检测-化学试卷-含答案与评分标准

大兴区2013-2014学年度第一学期期末检测试卷初三化学可能用到的相对原子质量 H 1 C 12 N 14 O 16 Na 23 Si 28 S 32 Cl 35.5K 39 I 127 Ba 137一、选择题(每小题只有1个选项符合题意。

共25个小题,每小题1分,共25分。

) 1. 下列变化中,属于化学变化的是A .铁丝折弯B .酒精挥发C .水果腐烂D .冰块融化 2.空气成分中,体积分数约占78%的是A .氮气B .氧气C .二氧化碳D .稀有气体 3.决定元素种类的是A .质子数B .中子数C .核外电子数D .最外层电子数 4.地壳中含量最多的金属元素是A .OB .SiC .AlD .Fe 5.根据“原子量”递增的顺序,绘制了第一张元素周期表的科学家是A .拉瓦锡B .卢瑟福C .门捷列夫D .道尔顿6.食用瘦肉、蛋、鱼等可以补铁。

这里的“铁”指的是A .元素B .原子C .分子D .单质7.下列反应中,属于分解反应的是A .4Al + 3O2Al 2O 3B .Zn + H 2SO ZnSO 4 + H 2↑C .CaCOCaO + CO 2↑ D .3MnO 2+4Al高温3Mn+2Al 2O 38.配制50 g 溶质的质量分数为6%的氯化钠溶液,不需要...的仪器是 A .蒸发皿B .玻璃棒C .烧杯D .量筒 9.下列符号中,表示2个氢分子的是A.H2B .2HC .2H 2D .2H +10.下列物质中,属于溶液的是A .牛奶B .豆浆C .冰水D .糖水11.野营篝火时通常将木材架空,其目的是A.方便添加木材B.升高木材的温度C.降低木材的着火点D.使木材与空气充分接触12.反应H2 + Cl2点燃2HCl中,反应前后没.有.改变的是A.分子的种类B.原子的种类C.元素的化合价D.物质的种类13.下列物质的用途中,利用其物理性质的是A.氢气作清洁燃料B.碳用于冶炼金属C.氧气用于切割金属D.干冰用于人工降雨14.下列关于氧气的说法中不正确...的是A.氧气约占空气总体积的1/5B.氧气可以支持燃烧,说明氧气具有可燃性C.夏天鱼池内需要增氧,是因为温度升高,氧气在水中的溶解度减小D.氧气供给呼吸,它和体内物质反应,释放能量,维持生命活动的需要15.下列实验操作中,正确的是A.倾倒液体B.过滤C.蒸发食盐水D.称量固体16.氟元素的相关信息如右图所示。

初中物理 北京市大兴区第一学期期末考试九年级物理考试题及答案.docx

初中物理 北京市大兴区第一学期期末考试九年级物理考试题及答案.docx

xx学校xx学年xx学期xx试卷姓名:_____________ 年级:____________ 学号:______________题型选择题填空题简答题xx题xx题xx题总分得分一、xx题(每空xx 分,共xx分)试题1:下列物理量中,以科学家安培的名字作为单位的是A.电流B.电压C.电阻D.电功率试题2:如图1所示的四种用品中,通常情况下属于导体的是试题3:如图2所示的各用电器中,利用电流热效应工作的是试题4:评卷人得分科技馆内有一个“静电球”,当参观者触摸静电球时,参观者的头发丝便会一根根地竖起,形成“怒发冲冠”的奇妙景象,如图3所示。

对这个实验有如下描述,其中正确的是A.竖起的头发丝带有异种电荷B.“静电球”的表面可能是塑料制成的C.参观者必须站在绝缘板上才能完成实验D.在湿润的环境中完成这个实验会更容易试题5:图4所示的几种家用电器正常工作时,消耗的电功率接近50W的是试题6:塑料外壳的手电筒的构造如图5所示,手电筒内装了两节干电池。

关于手电筒的电路,下列说法正确的是A.灯泡发光时,电能转化为化学能B.干电池为电源,按键为电路开关C.金属弹簧为绝缘体,不属于电路的一部分D.灯泡发光时,灯丝中的电流是由正电荷定向移动形成的试题7:如图6所示,电源电压为3V保持不变,两灯泡都标有“3V 0.9W”字样,要使两灯泡都能正常发光,下列说法正确的是A.只闭合S1B.只闭合S2C.闭合S1和S2,断开S3D.闭合S1和S3,断开S2试题8:如图7所示,与实物图一致的电路图是试题9:“珍爱生命,注意安全”是同学们日常生活中必须具有的意识。

关于安全用电,下列说法正确的是A.导线或用电器起火时,可立即用水扑灭B.发现有人触电,直接用手把他拉开C.家用电冰箱的金属外壳要接地D.更换灯泡时可以不必切断电源试题10:下列说法中正确的是A.电风扇工作时,将机械能转化为电能B.电饭锅工作时,将内能转化为电能C.给手机电池充电时,将电能转化为化学能D.发电机工作时,将电能转化为机械能试题11:关于导体的电阻,下列说法中正确的是A.导体两端的电压为0V时,导体的电阻也为0ΩB.通过导体的电流为0A时,导体的电阻也为0ΩC.铜导线的电阻一定比铝导线的电阻小D.铜导线的电阻可能比铝导线的电阻大试题12:小明家的电路简化后如图8所示,观察该电路,下列说法中正确的是A.电灯、电视和台灯是并联的B.开关和电灯是并联的C.各个小彩灯之间是并联的 D.插座中的火线和零线是连通的试题13:下列说法中正确的是A.家中同时使用的用电器越多,家庭电路中总电流就越大B.电流通过用电器所做的电功越多,这个用电器的电功率就越大C.在相同时间内,额定功率越大的用电器,工作时消耗的电能就越多D.电炉子工作时,电炉丝热得发红,而连接电炉子的导线并不太热,是因为电炉丝中电流比导线中电流大得多试题14:小梅同学设计了如图9所示的汽车有害尾气排放检测电路。

北京市大兴区九年级(上)期末数学试卷

北京市大兴区九年级(上)期末数学试卷

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声明:试题解析著 作权属菁优网 所有,未经书 面同意,不得 复制发布 日期:2018/12/31 10:13:23 ;用户:qgjy us er10570;邮箱: qgjyus er10570.21 957750;学号 :21985579
数关系用图象表示大致是( )
第1页(共9页)
A.
B.
C.
D.
7.(3 分)如图,将一把两边都带有刻度的直尺放在半圆形纸片上,使其一边经 过圆心 O,另一边所在直线与半圆相交于点 D、E,量出半径 OC=5cm,弦 DE=8cm,则直尺的宽度为( )
A.1cm
B.2cm
ቤተ መጻሕፍቲ ባይዱ
C.3cm
D.4cm
8.(3 分)如图,在 Rt△ABC 中,∠C=90°,∠B=30°,AB=4cm,若以点 C
21.(5 分)图 1 中的摩天轮可抽象成一个圆,圆上一点离地面的高度 y(m)与 旋转时间 x(min)之间的关系如图 2 所示.
(1)根据图 2 填表:
x(min)
0
3
6
8
12

y(m)

(2)变量 y 是 x 的函数吗?为什么?
(3)根据图中的信息,请写出摩天轮的直径.
第4页(共9页)
22.(5 分)已知:如图,△ABC 内接于⊙O,∠C=45°,AB=2,求⊙O 的半 径.
于 3,则△ABC 的面积等于( )
A.9
B.15
C.18
D.27
5.(3 分)当 m<﹣1 时,二次函数 y=(m+1)x2﹣1 的图象一定经过的象限是

北京市大兴区九年级(上)期末数学试卷

北京市大兴区九年级(上)期末数学试卷

解:设抛物线 y=2(x-3)2+k 向下平移 1 个单位长度后的解析式为 y=2(x-3)
2+k-1,
把点(2,3)代入 y=2(x-3)2+k-1 得,3=2(2-3)2+k-1, ∴k=2, 故选:A. 把点坐标代入 y=2(x-3)2+k-1 解方程即可得到结论. 此题主要考查了二次函数的图象与几何变换,熟练掌握抛物线的平移规律是 解题关键.
本题考查的是等式的性质: 等式性质 1:等式的两边加(或减)同一个数(或式子)结果仍相等; 等式性质 2:等式的两边同乘(或除以)同一个数(除数不为 0)结果仍相等. 2.【答案】D
【解析】
解:由勾股定理得 AB=
=5,
sinA=

故选:D. 根据勾股定理,可得 AB 的长,根据角的正弦,等于角的对边比斜边,可得答 案.
第 4 页,共 19 页
24. 如图,点 C 是⊙O 直径 AB 上一点,过 C 作 CD⊥AB 交⊙O 于点 D,连接 DA,延 长 BA 至点 P,连接 DP,使∠PDA=∠ADC.
1 求证:PD 是⊙O 的切线; 2 若 AC=3,tan∠PDC=43,求 BC 的长.
25. 如图,Rt△ABC 中,∠C=90°,P 是 CB 边上一动点,连接 AP,作 PQ⊥AP 交 AB 于 Q.已知 AC=3cm,BC=6cm,设 PC 的长度为 xcm,BQ 的长度为 ycm. 小青同学根据学习函数的经验对函数y随自变量x的变化而变化的规律进行了探究. 下面是小青同学的探究过程,请补充完整:
28. 对于平面内任意一个角的“夹线圆”,给出如下定义:如果一个圆与这个角的两边都 相切,则称这个圆为这个角的“夹线圆”.例如:在平面直角坐标系 xOy 中,以点 (1,1)为圆心,1 为半径的圆是 x 轴与 y 轴所构成的直角的“夹线圆”. 1下列各点中,可以作为 x 轴与 y 轴所构成的直角的“夹线圆”的圆心的点是; A (2,2),B(3,1),C(-1,0),D(1,-1) 2 若⊙P 为 y 轴和直线 l:y=33x 所构成的锐角的“夹线圆”,且⊙P 的半径为 1,

2012-2013大兴初三期末考试数学试题参考答案

2012-2013大兴初三期末考试数学试题参考答案

大兴区2012~2013学年度第一学期期末检测试卷初三数学参考答案及评分标准 第Ⅰ卷 (选择题 共32分)一、选择题(本大题共8个小题,每小题4分,共32分)题号 1 2 3 4 5 6 7 8 答案BCACAADD第Ⅱ卷(非选择题 共88分)二、填空题: (共4道小题,每小题4分,共16分) 9.. 10. -3,1. 11. 12 . 12.(1)2; (2)2 .三、解答题(本题共30分,每小题5分) 13. 解:原式=213232--⨯……………………………………………3分=21-. ………………………………………………………5分14. 解:设这个二次函数的关系式为2)1(2--=x a y ………………2分得:2)10(02--=a ………………………………………3分解得:2=a ……………………………………………………4分∴这个二次函数的关系式是2)1(22--=x y , ……………5分即224.y x x =-15. 解:答:甲同学的加工方法好∵S △ABC =AB ·BC =,∵AB =,∴BC =2 .…………………1分 ∵∠B =90°,∴AC =22AB BC +=. …………………2分如图甲∵四边形DBFE 是正方形, ∴DE ∥AB .N∴△CDE ∽△CBA . ∴D E C D A BC B= .设DE =x ,则CD =2-x , ∴2322x x -=.∴x= . …………………3分如图乙过B 点作BM ⊥AC 于点M 交DE 于点N , 由S △ABC =AB ·BC =AC ·BM ,可得BM =.∵DE ∥AC , ∴BN ⊥DE . ∴△BDE ∽△BAC . ∴D E B N A CB M= .设DE =y ,∴655625y y -= .∴y =3037. …………………4分∵>3037, …………………5分∴甲同学的正方形面积大.16. 解:(1)把C (1,3)代入y = kx ,得k =3 ……1分过点C 做CD ⊥AB 于点D , 则,sin ∠BAC = CD AC = 35. ∵C (1,3),∴CD =3,∴AC =5 . …………………………………2分(2)分两种情况,当点B 在点A 右侧时,如图1有:AD =22534-=,AO = 4-1 = 3 . ∵△ACD ∽△ABC ,∴2.A C A D A B =∴225.4ACAB AD==∴ 2513.443O B A B A O =-=-=此时B 点坐标为(134,0) . …………………………4分当点B 在点A 左侧时,如图2 此时AO =4+1=5,OB = AB -AO =254-5 = 54. 此时B 点坐标为(-54,0). …………………………5分所以点B 的坐标为(134,0)或(-54,0).17. 解:当x <-1或0<x <1或x >2时,12y y >;…………… 2分当x =-1或x =1或x =2时,12y y =; …………… 3分 当-1<x <0或1<x <2时,12y y < . .……………5分 18.解:连结CD ,∵BD 为 ⊙O 的直径,∴∠BAD = ∠BCD= 90°. ………………………………1分 ∴∠DBC =∠DAC =120°-90°= 30°. ……………2分 ∴∠BDC = 60°.∵AB =AC , ………………………………………3分∴A B A C =. ∴∠BDA =∠ADC =30°.∴△BD C ≌△DB A . ……………………………………4分 ∴BC = AD =6 . ……………………………………5分四、解答题(本题共20分,每小题5分) 19.(1)解法一:…………………1分解法二:P(和为奇数)=126=21. ……………………………………………3分(2)答:公平. ……………………………………………4分理由为:P(和为偶数)=126=21. ……………………………………5分∵P(和为奇数)= P(和为偶数), ∴该方法公平. 20. 解:(1)画图正确 (2)分(2)当y < 0时,x 的取值范围是x <-3或x >1;……………………………3分(3)平移后图象所对应的函数关系式为y = - 12(x -2)2+2,或写成y =- 12x 2+2x . …………………………………………………5分21.解:∵DC = AC = 6,∠C =90°,∴AD =62. ………………………………………1分又∵3s i n 5B =,AC = 6,∴ AB = 10 . ∴ BC = 8 .∴ BD = 2 . ………………………………………2分 作DE ⊥AB 于点E , ∴53sin ===AB AC BD DE B . ∴DE =56. ………………………………………3分∴由勾股定理得,BE =58.∴AE =10-58=542. …………………………………4分∴tan ∠BAD =17D E A E=. …………………………5分22. 解:(1)画图:………………………………………1分(2)结论:AB=AF+CF . …………………2分 证明:分别延长AE 、DF 交于点M ,∵E 为BC 的中点, ∴BE =CE . ∵AB ∥CD ,∴∠BAE =∠M .在△ABE 与△MCE 中, ∠BAE =∠M∠AEB =∠MECBE =CE ,∴△ABE ≌△MCE . ∴AB =MC . 又∵∠BAE =∠EAF , ∴∠M =∠EAF .∴MF =AF . 又∵MC =MF +CF ,∴AB =AF +CF . …………………………3分 (3)分别延长DE 、CF 交于点G ,…………4分 ∵AB ∥CF ,∴∠B =∠C ,∠BAE =∠G .∴△ABE ∽△GCE . ∴A B B E G CE C = . 又∵12B E E C=,∴12A B G C=.∵AB =5, ∴GC =10 . ∵FC =1, ∴GF =9 . ∵AB ∥CF , ∴∠BAE =∠G . 又∵∠BAE =∠EDF , ∴∠G =∠EDF . ∴GF =DF .∴DF =9 . …………………5分五、解答题(本题共22分,第23题7分,第24题7分,第25题8分) 23. (1)证明:∵∠A ,∠C 所对的圆弧相同,∴∠A =∠C . ………………………………………1分∵AB ⊥CD,∴Rt △APD ∽Rt △CPB . ∴A P P D C PP B=.∴PA ·PB =PC ·PD . ………………………………2分 (2)证明:∵F 为BC 的中点,△CPB 为直角三角形,∴PF =FC ,∠CPF =∠C . 又∵∠A =∠C ,∠DPE =∠CPF ,∴∠A =∠DPE . ∵∠A +∠D =90°, ∴∠DPE +∠D =90°.∴EF ⊥AD . ………………………………………4分 (3)解:作OM ⊥AB 于M , ON ⊥CD 于N ,∴OMPN 为矩形.连接OB ,OD ,OP ,由垂径定理,得AM =BM =4,CN =DN =3.由勾股定理,得222(25)44O M =-=,222(25)311O N =-= .∴2215O P O M O N =+=.……………7分 24.解:(1)由二次函数图象的对称性可知2n =;y 的最大值为1……………………2分(2)设2y ax bx =+,由题意得:1420a b a b +=⎧⎨-=⎩,解这个方程组得:1323a b ⎧=⎪⎪⎨⎪=⎪⎩ .故这个二次函数的解析式为21233y x x =+.∵103> ∴y 没有最大值. …………………………………………………4分(3)由题意,得210a b a n b n +=⎧⎨+=⎩,整理得:()210a n a n +-=∵0n ≠ ∴10a n a +-=.即:()11n a -=,且1n ≠.若y 有最小值,则需0a > ∴10n ->, 即1n <. ∴1n <时,y 有最小值. …………………………………………………7分25.解:(1)根据题意,得CO =AB =BC •tan ∠ACB =4, ∴A (0,3),C (4,0).设直线AC 的解析式为:y =kx +3,代入C点坐标,得:4k +3=0,k =43-.∴直线AC :y =43-x+3. …………………………1分(2)分别作DF ⊥AO ,DH ⊥CO ,垂足分别为F ,H , 则有△ADF ∽△DCH ∽△ACO .∴AD :DC :AC =AF :DH :AO =FD :HC :OC , 而AD =3t (其中0≤t ≤35),OC =AB =4,AC =5,∴FD =t AD 51254=,AF =tAD 5953=,DH =t593-,HC =t5124-.∴D (t512,t593-).∵CE = t , ∴OE =OC -CE =4- t .∴E (4-t ,0). ………………………………………5分 (3)当DO ⊥DE 时,∠DOH =∠EDH . ∵tan ∠DOH =tan ∠EDH , ∴D HE H O HD H = 即2D HE H O H= ∵DH =t593-,OH =FD =125t ,EH =CH -CE =1745t-,∴(t 593-)2=(1745t-)·125 .即:19t 2-34t +15=0 . t 1=1, t 2= .①当t =1时, D (12655,), E (3,0).设抛物线解析式为y =ax 2+bx , 代入D 、E 坐标 解得 a =56-,b =.∴y =25562x x -+. ……………………………………………………………………8分②当t =时,同理可得 y =219613030x x -+.以上①、②解出一种即可.说明:以上各题的其它解法如果正确,请参照本评分标准给分.。

2013大兴区初三(上)期末语文

2013大兴区初三(上)期末语文

2013大兴区初三(上)期末语文一、语文基础.下面各题均有四个选项,其中只有一个符合题意,选出答案后填写在答题纸上.(共12分.每小题2分)1.(2分)下列词语中加点字的读音完全正确的一项是()A.阔绰.(chuò)附和.(hé)坚持不懈.(xiè)B.撂.下(liào)避讳.(huì)大事渲.染(xuān)C.解.元(jiè)缄.默(jiān)煞.有介事(shà)D.星宿.(sù)狡黠.(xiá)偃.旗息鼓(yǎn)2.(2分)下列词语中有错别字的一项是()A.忸怩抱歉万贯家私截然不同B.轩敞掂量甘败下风趋炎附势C.犀利晶莹习以为常不知所措D.惋惜侥幸不屑置辩无精打采3.(2分)结合语境,在下面语段中的横线处填入句子,衔接最恰当的一项是()长时间使用手机耳机,声音全部进入耳内,这种高频率的声音很容易使体内血管发生紊乱,。

复旦大学附属医院迟放鲁教授做出了解释:用手机耳机听音乐,会对听神经的末梢产生刺激,引起听神经异常兴奋,;再加上耳机接近耳膜,能将声音信号提高10分贝左右,时间长了,,轻度会听觉迟钝,中度以上就会耳聋。

①会对耳膜造成伤害②容易造成听觉疲劳③从而导致听力受损。

A.①③②B.③②①C.③①②D.①②③4.(2分)依据文段内容,对画线病句的修改最恰当的一项是()“中国梦”是民族的梦,归根到底是人民的梦,必须紧紧依靠人民来实现,必须不断为人民造福。

2013年春天的“两会”和秋天的“十八届三中全会”,承载着中华民族五千年文明,由亿万人民承载着梦想和重托。

这春秋两季盛会指引我们前进的方向,因为梦想,生活变得飞扬热烈,因为梦想,使命变得无比厚重。

A.修改:承载着亿万人民的梦想和重托B.修改:承载着亿万人民的重托和梦想C.修改:亿万人民承担着梦想和重托D.修改:亿万人民承担着重托和梦想5.(2分)对下面这首诗理解与分析有误的一项是()望岳杜甫岱宗夫如何?齐鲁青未了。

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大兴区2012~2013学年度第一学期期末试题 初三数学
第Ⅰ卷 (选择题 共32分)
一、选择题(共8小题,每小题4分,共32分)在下列各题的四个备选答案中,只有一个是正确的.
1.如图所示:△ABC 中,DE ∥BC ,AD=5,BD=10,AE=3,
则CE 的值为
2.函数23y x =--的图象顶点是 A .(0,3) B.(-1,3) C. (0,-3) D. (-1,-3) 3.已知∠A 为锐角,且sin A <
2
1
,那么∠A 的取值范围是 A. 0°< A < 30° B. 30°< A <60° C. 60°< A < 90° D. 30°< A < 90° 4.如图,AB 、CD 是⊙O 的弦,且AB ∥CD , 若∠BAD = 36°,则∠AOC 等于
A .36° B. 54° C. 72° D. 90°
5. 已知⊙O 的半径为1,点P 到圆心O 的距离为d ,若抛物线 2
2y x x d =-+与x 轴有两个不同的交点,则点P
A 、在⊙O 的内部
B 、在⊙O 的外部
C 、在⊙O 上
D 、无法确定
6.已知如图(1)、(2)中各有两个三角形,其边长和角的度数已在图上标注,图(2)中AB 、CD 交于O 点,对于各图中的两个的两个三角形而言,下列说法正确的是
A. 都相似
B. 都不相似
C. 只有(1)相似
D. 只有(2)相似
(1) (2) 7.有A ,B 两只不透明口袋,每只口袋里装有两只相同的球,A 袋中的两只球上分别写了“细”、“心”的字样,B 袋中的两只球上分别写了“信”、“任”的字样,从每只口袋里各摸出一只球,能组成..
“信心”字样的概率是
35
75
75
70
A
B C
D
O 4 3 6 8
E
A
B
C
D
D
C
B
A
O
A .
43 B .32
C . 31
D . 41 8.已知函数)
)((b x a x y --=(其中a b >)的图象如下面右图所示,则函数b
ax y +=的图象可能正确的是
第Ⅱ卷 (非选择题 共88分)
二、填空题(共4小题,每小题4分,共16分)
9.如图,△ABC 的顶点都在方格纸的格点上,则sin A =_______.
10.如图,矩形ABCD 的对角线BD
的中点经过坐标原点,矩形的边分别
平行于坐标轴,点C 在反比例函数221
k k y x
++=
的图象上.若点A 的
坐标为(-4,-1),则k 的值为___________.
11.在一个不透明的袋中,装有若干个除颜色不同外其余都相同的球,如果袋中有3个红球且摸到红球的概率为 1
4 ,那么袋中球的总个数为错误!未找到引用源。

个.
12.现有直径为2的半圆O 和一块等腰直角三角板
(1)将三角板如图1放置,锐角顶点
P 在圆上,斜边经过点B ,一条直角边交圆于点Q ,则BQ 的长为________;
(2)将三角板如图2放置,锐角顶点P 在圆上,斜边经过点B ,一条直角边的延长线交圆于Q ,则BQ 的长为______ .
图1 图2
y x 1 1
O A
y x
1 -1 O
B
y
x
-1 -1 O
C
1
-1
x
y O
D
C
B
A
Q
P O
B
A
Q
P
O B
A
三、解答题(本题共30分,每小题5分)
13.计算:2cos 30º – tan 60º – sin 30º.
14. 已知二次函数的图象过坐标原点,它的顶点坐标是(1,-2),求这个二次函数的关系式.
15. 一块直角三角形木板的一条直角边AB 长为1.5米,面积为1.5平方米,要把它加工成一个面积最大的正方形桌面.甲、乙两位同学的加工方法如图所示,请你用学过的知识说明哪位同学的加工方法符合要求(加工损耗忽略不计,计算结果中的分数可保留).
16. 已知Rt △ABC 的斜边AB 在平面直角坐标系的x 轴上,点C (1,3)在反比例函数y = k x
的图象上,且sin ∠BAC = 3
5.
(1)求k 的值及边AC 的长; (2)求点B 的坐标.
17. 二次函数2
121
y x x
=--与反比例函数
22
y
x
=-的图像在如图所示的同一坐标系中,请
根据如图所提供的信息,比较
1
y与的大小.
18.已知:如图,△ABC内接于⊙O,∠BAC=120°,AB=AC,BD为⊙O的直径,AD=6,求BC的长.
四、解答题(本题共20分,每小题5分)
19.某班要从演讲水平相当的甲、乙两人中选派一人参加学校的演讲大赛,为了公平,班委会设计了一个方法,其规则如下:在一个不透明的袋子里装有形状、大小、质地等完全相同的3个小球,把它们分别标上数字1、2、3,由甲从中随机摸出一个小球,记下小球上的数字;在另一个不透明口袋中装有形状、大小、质地等完全相同的4个小球,把它们分别标上数字1、2、3、4,由乙从口袋中随机摸出一个小球,记下小球上的数字,然后计算出这两个数字的和,若两个数字的和为奇数,则选甲去;若两个数字的和为偶数,则选乙去.(1)请用树状图或列表的方法求甲被选去参加演讲大赛的概率;
(2)你认为这个方法公平吗?若公平,请说明理由;若不公平,请设计一个公平的方法.
20.已知二次函数y = - 12 x 2 - x + 3
2
.
(1)在给定的直角坐标系中,画出这个函数的图象;
(2)根据图象,写出当y < 0时,x 的取值范围; (3)若将此图象沿x 轴向右平移3个单位,请写出平移后图象所对应的函数关系式.
21. 如图,在Rt △ABC 中,∠C=90°,5
3
sin
B ,点D 在B
C 边上,DC= AC = 6, 求tan ∠BA
D 的值.
x
y
O
D
C
B
A
22.
操作:如图①,点O 为线段MN 的中点,直线PQ 与MN 相交于点O ,请利用图①画出一对以点O 为对称中心的全等三角形。

图① 根据上述操作得到的经验完成下列探究活动:
探究一:如图②,在四边形ABCD 中,AB ∥DC ,E 为BC 边的中点,∠BAE =∠EAF ,AF 与DC 的延长线相交于点F. 试探究线段AB 与AF 、CF 之间的等量关系,并证明你的结论;
探究二:如图③,DE 、BC 相交于点E ,BA 交DE 于点A ,且BE :EC =1:2, ∠BAE =∠EDF ,CF ∥AB 。

若AB =5,CF =1,求DF 的长度。

P N M Q
O
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.已知:如图,在半径为52的⊙O 内,有互相垂直的两条弦AB ,CD ,它们相交于P 点. (1)求证:PA ·PB=PC ·PD ;
(2)设BC 的中点为F ,连接FP 并延长交AD 于E ,求证:EF ⊥AD ;
(3)如果AB=8,CD=6,求O 、P 两点之间的距离.
24.已知二次函数2
(0)y a x b x c a =++≠的图象经过(00)(1)O M ,,,1和()(0)N n n ≠,0三点.
(1)若该函数图象顶点恰为点M ,写出此时n 的值及y 的最大值;
(2)当2n =-时,确定这个二次函数的解析式,并判断此时y 是否有最大值;
(3)由(1)、(2)可知,n 的取值变化,会影响该函数图象的开口方向.请你求出n 满足 什么条件时,y 有最小值?
F
E P O
D C B
A
25. 如图,在矩形ABCO 中,AO=3,tan ∠ACB=
3
4
,以O 为坐标原点,OC 为x 轴,OA 为y 轴建立平面直角坐标系。

设D ,E 分别是线段AC ,OC 上的动点,它们同时出发,点D 以每秒3个单位的速度从点A 向点C 运动,点E 以每秒1个单位的速度从点C 向点O 运动,设运动时间为t 秒。

(1)求直线AC 的解析式;
(2)用含t 的代数式表示点D,点E 的坐标;
(3)当以O 、D 、E 三点为顶点的三角形是直角三角形时,求经过O 、D 、E 三点的抛物线的解析式(只需求出一条即可).。

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