2018-2019上海市民办华育中学八年级期中考试测试卷(无听力)
上海市民办华育中学2018-2019学年八年级上学期期中英语试题(含答案解析)
上海市民办华育中学2018-2019学年八年级上学期期中英语试题学校:___________姓名:___________班级:___________考号:___________一、单项选择1.Be careful not to wake the baby.A./keə’fl/B./kiə’fl/C./’keəfl/ D./’kiəfl/ 2.Which of the following underlined parts is different in pronunciation from others? A.She was standing on one foot. B.I won’t leave until you come back.C.She was unable to contain her excitement. D.Who will pay the electricity bill?3.A little boy wrote ________ “u” and ________ “n” on the wall.A.a; an B.an; a C.an; an D.a; a4.I have lost my pen. I must buy ________ today.A.it B.this C.one D.that 5.You’ve got so many books. Could you please lend me ________ to read?A.anything B.any C.something D.some 6.They’ve taken everything with ________.A.them B.themselves C.they D.their 7.She had to borrow a new ________ in order to attend the party.A.cloth B.clothes C.clothing D.dress8.________ useful information board you have made!A.How B.What C.How a D.What a9.I am not sure how long Oliver ________.A.has joined the army B.has joined in the army C.has served the army D.has served in the army10.What is the chemical symbol ________ water?A.about B.of C.on D.for11.________ a father, she has a younger brother to support.A.Beside B.Besides C.Except D.Except for 12.I hate to admit it, ________ I think I was wrong.A.and B.but C.or D.so13.He’s an ________ engineer, he can deal with ________ problems.A.electricity, electrical B.electrical, electrical C.electrical, electric D.electrical, electricity14.History ________ repeat itself.A.needs not B.need not C.doesn’t need D.need not to 15.What did you ________ about water pollution at the meeting?A.talk B.say C.speak D.tell16.In the past few years, ________ great changes in Shanghai.A.there were B.there have had C.there had been D.there have been 17.Joyce suggested ________.A.them talk it over among themselves B.them talked it over among themselves C.they talk it over among themselves D.they talked it over among themselves 18.Where do you think ________ Tonny ________ the jacket?A.did, buy B.did, bought C.has, bought D./, bought 19.Which sentence is correct?A.I wonder where you have gone. B.I wonder where they visited.C.I wonder when you have finished the task. D.I wonder what is the matter with you. 20.—John and I will celebrate our fortieth wedding anniversary next month.—Oh, ________!A.cheer up B.well done C.go ahead D.congratulations二、用所给单词的正确形式填空21.They have both behaved ________ than before and I am very hurt. (bad)22.You can reduce these long ________ to simple charts or diagrams. (explain)23.In ________ cold weather, everything seems to be frozen. (freeze)24.Our government is trying to take ________ to prevent and control pollution. (measure) 25.My father exercises ________ because he doesn’t have e nough time. (regular) 26.They do not have the ________ to apologize for their actions. (encourage)27.A friend is a living treasure, and if you have one, you have one of the ________ gifts in life. (value)28.Such negative thoughts and feelings make some people feel like ________ up. (give) 29.I didn’t know a thing about the verbs, for I ________ my lesson. (not study)30.The miners ________ alive when the tunnel collapsed. (bury)31.Look! Jerry ________ and he belongs to a ski club. (ski)32.I hope you ________ the secret of how to be happy. (find)33.I don’t think Renee saw us. She ________ a watch for her father. (choose)34.Let us hold our hands and ________ the environment. (not pollute)三、改写句子35.Daisy was told not to eat sweets any more. (反意疑问句)Daisy was told not to eat sweets any more, ________ ________?36.The doctor took good care of the wounded. (改为被动句)The wounded ________ ________ good care of by the doctor.四、同义句转化37.I don’t know if I will go with you tomorrow. (同义句转换)I don’t know ________ ________ go with you tomorrow.38.Benny wanted to trick his sister. (同义句转换)Benny wanted to ________ ________ ________ ________ his sister.五、划线部分提问39.Life in our cities will be inconvenient without electricity.(划线提问)________ will life in our cities ________ ________ without electricity?六、将所给单词连成句子40.machine, makes, kinds, works, it, goods, the, of, that, all(连词成句)________________________________.七、短文选词填空Complete the following passage with the words or phrases in the box. Each word or phrase can only be used once.More Than a Ride to SchoolThe National Education Association claims, “The school bus is a mirror of the community.” They further add that, unfortunately, what appears on the exterior does not always reflect the reality of a chosen community. They are right—sometimes it reflects more! Just ask Liesl Denson. Riding the school bus has been more than a ride to school for Liesl.Bruce Hardy. school bus driver for Althouse BUS Company has been Liesl’s bus driver since kindergarten. Last year when Liesl’s family moved to Parkesburg, 41.her bus went by her new residence, she requested to ride the same bus.This year Liesl is a senior and will enjoy her last year riding the bus. She says, “It’s been a great ride 42.! My bus driver is so cool and has always been a good friend and a good liste ner. Sometimes when you’re a child, adults do not think that what you have to say is important. Mr. Hardy always listens to what you have to say and makes you feel important.” Her friends Ashley Batista and Amanda Wolfe agree 43.what Liesl said. Bruce Hardy has been making Octorara students feel special since 1975. This year he will celebrate 40 years working for Althouse Bus Company. Larry Althouse, president of the company, acknowledges Bruce Hardy’s outstanding record, “You do not come by employees lik e Bruce these days. He has never missed a day of work and has a perfect driving record. He was recognized in 2000 by the Pennsylvania School Bus Association for driving 350,000 accident-free miles. Hardy’s reputation is made 44.evident through the relationships he has made with the students that ride his bus.”Althouse further adds, “Althouse Bus Company was established 70 years ago and has been providing quality transportation 45.. My grandfather started the business with one bus. Althouse Bus Company is delighted to have the opportunity to bring distinctive and safe service to our local school and community and looks forward to continuing to provide quality service for many more years to come.”Three generations of business is not all the company has enjoyed. Thanks 46.drivers like Bruce Hardy, they have been building relationships through generations, Liesl’s mother Carol also enjoys fond memories of riding Bruce Hardy’s bus to the Octorara School District.八、阅读单选The Exploding Lakes of CameroonWhat comes to mind when you think of a lake? You probably imagine a pretty scene with blue water, birds, and fish. For the people in the northwestern Cameroon, however, the image is very different. For them, lakes may mean terrible disasters. In 1984, poisonous gases exploded out of Lake Monoun and came down into the nearby villages, killing thirty-seven people. Two years later, Lake Nyos erupted a cloud of gases rolled down the hills and into the valleys and killed 1,700 people.Lake Nyos and Lake Monoun are crater (火山口) lakes. They were formed when water collected in the craters of old volcanoes. The volcanoes under Lake Nyos and Lake Monoun are not active anymore. However, poisonous gases from the center of the earth continue to flow up through cracks in the bottom of the lake. This is normal in a crater lake. In most crater lakes, these gases are released often because the water “turns over” regularly. That is, the water from the bottom of the lake rises and mixes with the water at the top, allowing the gases to escape slowly.However, in Lakes Nyos and Monoun, there is no regular turning over. No one knows the reason for this fact, but as a result, these lakes have more gases tapped at the bottom than other crater lakes. In fact, scientists who have studied Lakes Nyos and Monoun have found 16,000 times more gases. When a strong wind, cool weather, a storm, or a landslide (滑坡) causes the water to turn over suddenly, the gases escape in a violent explosion.In the past, no one knew when the gases might explode, so there was no way for the villagers to escape disaster. Now scientists from the United States, France, and Cameroon have found a way to reduce the gas pressure at the bottom of Lake Nyos. They stood a672-foot plastic pipe in the middle of the lake, with one end of the pipe near the bottom and the other end in the air. Near the top of the pipe, the team put several holes that could be opened or closed by a computer. Now, when the gas pressure gets too high, the holes are opened and some of the gas-filled water shoots up through the pipe into the air like a fountain. With less pressure, a disastrous explosion is much less likely. However, the scientists are not sure that one pipe will be enough to prevent explosions. They hope to put in others soon and they plan to install a similar pipe and a computer system at Lake Monoun as well.To protect people nearby until all of the pipes are in place, the scientists have installed early warning systems at both lakes. If the gas pressure rises to a dangerous level, computers will set off loud sirens (警报) and bright lights to warn the people in the villages. That way, they will have time to escape from the dangerous gases.47.What will happen when Lake Nyos and Lake Monoun explode?A.Water will flow down the hills. B.Poisonous gases will be released suddenly.C.A strong wind will rise from the lakes. D.The volcanoes will come to life. 48.Which of the following statements about Lake Nyos and Lake Monoun is true? A.They were formed in 1984. B.They are at the top of two activevolcanoes.C.They are not like most other crater lakes. D.Water in them turns over regularly. 49.Lake Nyos and Lake Monoun explode because ________.A.the gases rise to the top and mix with airB.people from the villages turn over the waterC.scientists have put in a computer systemD.they have more gases trapped at the bottom than other crater lakes50.A team of scientists has ________.A.erected a pressure-releasing pipe in the lake B.identified the gases at the bottom of the lakeC.built a beautiful fountain near the lakes D.removed all dangerous gases from the lakes51.What do we learn from the last paragraph?A.Scientists are planning to install pipes in all crater lakes B.Scientists still do not know how to prevent gas explosionsC.Explosion disasters could be avoided in the future D.Warming systems have been set up in the villages nearby.九、完型填空It was just getting dark; there was a touch of fog and I was on a lonely stretch of road. But I was going along cheerfully, thinking about the dinner I would eat when I got to Salisbury.I was going along quietly at about thirty-five miles an hour when suddenly I heard a scream, a woman’s scream- “Help!” I looked round, but the only 52 of life was a large, black, rather suspicious-looking(看起来可疑的) car just turning a bend in the road about a hundred yards away. That was 53 the cry had come from: I 54 speed and went after it. I thought the driver saw what I was doing, for he did the same and began to draw away from me. As I drew nea r, the girl’s voice came again, a lovely voice but trembling(发抖)with fear.“Let me go, you fool; you’re hurting me. Oh! Oh!”I felt my blood 55 . The fog was coming down thicker now, the countryside was lonelier. The man in the car had no 56 noticed this. Again, came a cry.“Drop the knife, fool. Oh!” Then a cry and a groan.If I was to save her, it was now or 57 . Perhaps even now I was too late. But if I couldn’t save the girl, I would 58 try to bring the murderer to the police station. The car was only a couple of yards away now. I drove the bike right across its path, and its brakes screamed as the driver tried to pull it over and crashed into the ditch (沟渠) on the side of the road. The door of the car was pushed open angrily and a dark, evil-looking fellow stepped out, mad with anger.“Fool!” he shouted 59 he came towards me with his fist raised to hit me. But I was quicker than he. I put all I knew into a blow that would have knocked out Joe Louis. It caught him right on the ground without a sound. I rushed to the car, pulled the door and peered inside. There was no girl there. Suddenly from the back of the car came a voice.“You have been listening to a radio play. Murder in Holl ywood, with Mae Garbo and Clark Taylor. The news will follow immediately.”52.A.person B.sign C.figure D.form 53.A.how B.when C.what D.where 54.A.put aside B.put up C.put down D.put on 55.A.boil B.run C.come D.freeze 56.A.sign B.effort C.doubt D.troubles 57.A.late B.then C.ever D.never 58.A.at most B.at least C.at last D.at first 59.A.before B.after C.as D.while十、短文首字母填空Read the passage and fill in the blanks with proper words.A Chimps(黑猩猩) will cooperate in certain ways, like gathering in war parties to protect their territory. But beyond the minimum requirements as social beings, they have little instinct (本能) to help one a60.. Chimps in the wild seek food for themselves. Even chimp mothers regularly decline to share food with their children, who are able from a young age to gather their own food.In the laboratory, chimps don’t naturally share food either. If a chimp is put in a cage where he can pull in one plate of food for himself or, with no great effort, a plate that also provides food for a neighbor to the next cage, he will pull at random—he just doesn’t carewhether his neighbor gets fed or not. Chimps are truly selfish.Human children, on the other hand are extremely cooperative. From the earliest ages, they desire to help others, to share information and to participate in a61.common goals. The psychologist Michael Tomasello has studied this cooperativeness in a series of experiments with very young children. He finds that if babies aged 18 months see a worried adult with hands f62.trying to open a door, almost all will immediately try to help.There are several reasons to believe that the urges to help, inform and share are not taught, but n63.possessed in young children. One is that these instincts appear at a very young age before most parents have started to train children to behave socially. Another is that the helping behaviors are not improved if the children are rewarded. A third reason is that social intelligence d64.in children before their general cognitive(认知的)skills, at least when compared with chimps. In tests conducted by Tomasello, the children did no better than the chimps on the physical world tests, but were considerably better at understanding the social world.The core of what children’s minds have and chimps’ don’t is wha t Tomasello calls shared intentionality. Part of this ability is that they can infer what others know or are thinking. But b65.that, even very young children want to be part of a shared purpose. They actively seek to be part of a “we”, a group that intend s to work toward a shared goal.十一、阅读回答问题Read the following passage and answer the questions.Being an astronaut sounds cool, doesn’t it? In space, they can do some pretty amazing things, like floating in zero gravity.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 in space. 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 visionunclear, 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 w ork 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, until they become a problem in a completely different environment, like space. There, astronauts ca n’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 end up throwing up (呕吐) everything in their stomachs, according to the UK National Space Center.Thus perhaps it’s only space explorers who can honestly say: “Gravity, you’re the best.”66.Crying isn’t more difficult in space than on the earth, is it?_______________________________67.Who experienced that the tears in space caused pain rather than comfort?_______________________________68.How do astronauts get rid of the tears in space?_______________________________69.Why can’t astronauts burp in space?_______________________________70.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?_______________________________十二、材料作文71.Write a passage of at least 60 words on the topic. “The fun of learning________ (English/painting/to play the piano/to play basketball…”Necessary points:1. What’s your experience of learning ________?2. Why do you think learning ________ is fun?(注意:短文中不得出现考生的姓名、校名及其他相关信息,否则不予评分。
【初二下数学】2019华育八下期中卷
2018学年第二学期期中考试 初二数学 试卷 2019.4.17(考试时间:90分钟 满分:100分)一、填空题(每空2分,共28分) 1.已知416x =,则x =_________2.下列关于x 的方程:(11=;(2)417x =-;(3)2(1)21a xx x +-=-;(4)8(0)x a a=≠;其中是整式方程的有__________ 3.方程23212x x x x -=-+-的根为__________ 4.如图所示,在梯形ABCD 中,AD BC ∥,对角线AC BD ⊥,且10AC =,5BD =,则这个梯形中位线的长等于__________5.关于x 、y 的方程组22211010x y x y x -=⎧⎨--+=⎩的解为___________ 6.某超市用2500元购进一批水果,销售过程中损耗水果10千克.已知超市每千克水果的售价比进价多1元,全部售完共赚440元,则这批水果每千克的进价为__________元 7.关于x 、y 的方程组2120x y x y m +=⎧⎨+-=⎩有两组相等的实数根,则m =__________8.定义一种新的运算*,使*()a b ab a b =+,则方程(*2)*2160x =的实数根为_________ 9.关于x1k =-无实根,则k 的取值范围为__________10.已知ABC ∆的周长为2,联结ABC ∆三边中点构成第二个三角形,再联结第二个三角形的三边中点构成第三个三角形,以此类推,第2020个三角形的周长是__________ 11.已知4322914920x x x x -+-+=,则1x x+=________ 12.在ABC ∆中,60A ∠=︒,AB =BC =AB 、CB 的中点D 、E ,则线段DE =__________ 13.关于x 的方程2(1)22563x k x x x x x --=--+-有增根,则k =__________ 14.已知实数0a >,0b >,满足2019a +=,22019b b +=,则a b +的值是_________第4题图二、选择题(每题3分,共12分)15.如图所示,已知四边形ABCD ,R ,P 分别是DC ,BC 上的点,E ,F 分别是AP ,RP 的中点,当点P 在BC 上从点B 向点C 移动而点R 不动时,那么下列结论成立的是( )A 、线段EF 的长逐渐增大B 、线段EF 的长逐渐减少C 、线段EF 的长不变D 、线段EF 的长不能确定16.为响应“传统文化进校园”的号召,我校举行了书法比赛,为鼓励获奖同学,学校购买了一些钢笔和毛笔,钢笔单价是毛笔单价的1.5倍,购买钢笔用了1200元,购买毛笔用率1500元,购买的钢笔支数比毛笔少20支,钢笔,毛笔的单价分别是多少元?如果设毛笔的单价为x 元/支,那么下面所列方程正确的是( )A 、12001500201.5x x -= B 、150********.5x x -= C 、1500120020 1.5x x =- D 、12001500201.5x x-= 17.下列无理方程有解的有( )(110=;(2(3;(4x =-; (51x -=;A 、1个B 、2个C 、3个D 、4个18.下列说法正确的是( )(1)二项方程的解的个数为1或2;(2)两个不同的二元二次方程一定可以组成一个二元二次方程组; (32=是分式方程; (4)2224x y x y +=⎧⎨+=⎩的实数解有两组; (5)关于x 的方程420ax bx c ++=,当0ab <,0ac >时,方程一定有4个实数根.A 、0个B 、1个C 、2个D 、3个三、解方程(组)(每题5分,共25分) 19. 2222125+044348314x x x x x x --=---+-第15题图20. 22314612x y x y x y x y⎧+=⎪++⎪⎨⎪-=⎪++⎩21. 1x +22. 222221833322760x xy y x xy y ⎧-+=⎪⎨++=⎪⎩23.解关于x 的方程:22()2n n a x b b a b x -=--(n 为正整数,0b ≠)四、列方程(组)解应用题(8分)24.华育中学为了迎接20周年校庆,决定对学校进行整修,于是与沪上某知名建筑公司商谈该工程项目.(1)因为要在教学楼的教室内安装空调,所以需要对现有的电路进行重新铺设.预计需要重新铺设6240米的电线,由于采用了新的铺设方法,现计划每天铺设的长度比原计划增加156米,因而可以比原计划提前两天完成,求现计划每天铺设多少米的电线.(2)据建筑公司预测,整个工程需要35天完成;如果每个工人每天多工作2小时,则工期可以缩短5天;如果增加6名工人,每人每天再多工作1小时,则工期可以再缩短十天.请计算原来施工的工人有多少名?每人每天工作多少小时?五、解答题(25题6分,26题6分,27题6分,共18分)25.如图,在梯形ABCD 中,CD AB ∥,点F 在AB 上,DF AF =,且DE AD ⊥交BC 于点E ,联结EF ,EF DE ⊥.(1)如果13DF =,12DE =,求AD 的长 (2)若E 为CB 的中点,求证:AF DC BF =+B26.已知关于x 、y 的方程组2242y x k y k x k +=⎧⎨=+-+⎩有两组不同的实数解11x x y y =⎧⎨=⎩,22x x y y =⎧⎨=⎩,且120x x +≠,(1)求k 的取值范围;(2)如果1x 、2x 为等腰三角形的两边,试求k 的取值范围.27.关于x(21)1kx k x =++有且只有一个实数根,求k 的取值范围.六、综合题(9分)28.如图1,函数(0,0)ky k x x=>>的图像于矩形OABC 的边AB 交于点E ,点A 在x 轴的正半轴,点C 在y 轴的正半轴,点B 的坐标是1(4,10)4m +,其中0m >,点D 在线段CO 上,4CD =,设点P 在该函数图像上,且它的横坐标为m .(1)当16k =时,则BE =_______(用含m 的代数式表示);(2)如图2,在(1)的条件下,若BDE ∆恰好是以BD 为腰的等腰三角形,求m 的值; (3)取PD 中点为G ,是否存在点P ,使得以PD 为斜边的直角三角形的直角顶点F 落在矩形OABC 的一边上(除边OC 外),且同时满足GF 垂直于这条边,30FDP ∠=度.若存在,直接写出k 的值;若不存在,请说明理由.x图1备用图x图2。
上海市华育中学八年级上学期期中考试数学试题及答案
上海市华育中学初二(上)数学期中试卷一、填空题(每空2分,共32分)1、当 _____________________时,3322--x x 有意义 2、化简:=--aa 11____________________ 3、已知103-=a ,则a 的倒数为_______________4、在实数范围内因式分解:=-+10324a a _____________________________5、++x x 3432__________3=(+x ______)2 6、当=x _________时,多项式x x 432-的值比多项式1622-+x x 的值小157、不解方程,判别关于x 的方程()()0321322=-++-m x m x 的根的情况是________________________ 8、已知方程0122=--x k x 有两个不相等的实数根,则k 的取值范围是_____________9、方程03532=-+m x x 的两根之比为1:3,则=m ___________10、一种药品原价60元,经过两次降价后,每盒的利润减少4.11元,那么平均每次降价的百分比是_____11、如图,ABC ∆绕顶点A 逆时针旋转︒54后,得到ADE ∆,这时点D 恰好落在BC 上,则=∠EDC ______ 12、如图,在ABC ∆中,AC AB =,AD 是ABC ∠的角平分线,AB DE ⊥,AC DF ⊥,垂足分别是E 、F ,则下列四个结论:①AD 上任意一点到点C 、点B 的距离相等;②AD 上任意一点到AB 、AC 的距离相等;③CD BD =,BC AD ⊥; ④CAD BDE ∠=∠。
其中,正确的是_____________﹙填序号﹚13、如图,ABC Rt ∆中,︒=∠90ABC ,D 是AC 的中点,BE 是CD 的垂直平分线,那么图中度数为︒30的角有__________个14、如图,在ABC Rt ∆中,︒=∠90C ,DE 是AB 的垂直平分线,且3:1:=∠∠BAC BAD ,则B ∠的度数为______________15、如图,已知O 是AB 、AC 的中垂线交点,E 是ABC ∠、ACB ∠角平分线的交点,︒=∠+∠180E O ,则=∠A _____________第11题图 第12题图 第13题图 第14 题图 第15题图BE O E D B E DF E D B D E B B C C C C C A A A A A二、选择题﹙每题3分,共12分﹚1、对于任何实数a ,下面的数中必定是正数的是( )A 、4+aB 、a a +-2C 、162+-a aD 、642++a a2、以下命题中假命题的个数是( )①一个角的两边分别与另一个角的两边平行,则这两个角相等;②有两边和第三边上的高对应相等的两个三角形全等;③有一边相等的两个等腰三角形全等; ④若根式22+x 和13-x 是同类二次根式,则3=xA 、1B 、2C 、3D 、43、已知三角形两边长分别是1和2,第三边的长为03522=+-x x 的根,则这个三角形的周长是( ) A 、4 B 、214 C 、213 D 、不存在 4、若等腰三角形一腰上的高等于腰长的一半,则这个等腰三角形的底角为( )A 、︒75或︒15B 、︒30或︒60C 、︒75D 、︒30三、简答题:1、()083623233<⎪⎪⎭⎫ ⎝⎛÷⎪⎭⎫ ⎝⎛-x x y y x xy y (5分) 2、已知2=x ,求⎪⎪⎭⎫ ⎝⎛--+÷⎪⎪⎭⎫ ⎝⎛-++x x x x x x x x 1111的值。
【三套打包】上海华育中学八年级下学期期中数学试题
最新八年级(下)期中考试数学试题(含答案)一、选择题(本大题共6个小题,每小题3分,共18分,每小题只有一个正确选项)1.(3分)使有意义的x的取值范围是()A.x≤3B.x<3C.x≥3D.x>32.(3分)化简的结果正确的是()A.﹣2B.2C.±2D.43.(3分)下列各组数中,不能构成直角三角形的一组是()A.3,4,5B.1,2,C.5,12,13D.6,8,12 4.(3分)如图,▱ABCD的周长为36,对角线AC、BD相交于点O,点E是CD的中点,BD=12,则△DOE的周长为()A.15B.18C.21D.245.(3分)如图,菱形ABCD的对角线AC、BD的长分别为6和8,则这个菱形的周长是()A.20B.24C.40D.486.(3分)如图,在矩形AOBC中,O为坐标原点,OA、OB分别在x轴、y轴上,点B 的坐标为(0,3),∠ABO=30°,将△ABC沿AB所在直线对折后,点C落在点D 处,则点D的坐标为()A.(,)B.(2,)C.(,)D.(,3﹣)二、填空题(本大题共6小题,每小题3分,共18分.)7.(3分)与最简二次根式5是同类二次根式,则a=.8.(3分)计算(2+3)(2﹣3)的结果等于.9.(3分)一个三角形的三边分别是、1、,这个三角形的面积是.10.(3分)在Rt△ABC中,∠C=90°,∠A=30°,AB=6,则AC=.11.(3分)当2≤3x+5≤8时,化简+=.12.(3分)已知:矩形ABCD,AB=5,BC=4,P是边CD上一点,当△PAB是等腰三角形时,求PC的长可以是.三、(本大题共5小题,每小题6分,共30分)13.(6分)计算:(1)+|﹣2|﹣()﹣1(2)4+﹣+414.(6分)长方形的长是3+2,宽是3﹣2,求长方形的周长与面积.15.(6分)如图,一架梯子长2.5米,斜靠在一面墙上,梯子底端离墙0.7米,如果梯子的顶端下滑0.4米,那么梯子的底部在水平方向上滑动了多少米?16.(6分)已知:如图,四边形ABCD是菱形,F是AB上一点,DF交AC于E.求证:∠AFD=∠CBE.17.(6分)如图,在▱ABCD中,AB=10,AD=6,AC⊥BC.求BD的长度.四、(本大题共3小题,每小题8分,共24分).18.(8分)《九章算术》是我国古代最重要的数学著作之一,在“勾股”章中记载了一道“折竹抵地”问题:“今有竹高一丈,末折抵地,去本三尺,问折者高几何?”可翻译为:有一根竹子高一丈,今在A处折断,竹梢落在地面的B处,B与竹根部C相距3尺,求折断点A与地面的高度AC.(注:1丈=10尺)19.(8分)如图,四边形ABCD是正方形,△EBC是等边三角形.(1)求证:△ABE≌△DCE;(2)求∠AED的度数.20.(8分)如图,已知△ABC是等边三角形,点D、F分别在线段BC、AB上,DC=BF,以BF为边在△ABC外作等边三角形BEF.(1)求证:四边形EFCD是平行四边形.(2)△ABC的边长是6,当点D是BC三等分点时,直接写出平行四边形CDEF的面积.五、(本大题共2小题,每小题9分,共18分)21.(9分)对于形如的式子可以用如下的方法化简:===+.请仿照这样的方法,解决下列问题.(1)化简:(2)化简求值:已知x=,求(+)•22.(9分)如图,在菱形ABCD中,对角线AC与BD交于点O.过点C作BD的平行线,过点D作AC的平行线,两直线相交于点E.(1)求证:四边形OCED是矩形;(2)若CE=1,DE=2,则菱形ABCD的面积是.六、(本大题共12分)23.(12分)在矩形ABCD中,AB=6,BC=8,点E为BC延长线上一点,且BD=BE,连接DE,Q为DE的中点,有一动点P从B点出发,沿BC以每秒1个单位的速度向E 点运动,运动时间为t秒.=(用含t的式子表示);(1)如图1,连接DP、PQ,则S△DPQ(2)如图2,M、N分别为AB、AD的中点,当t为何值时,四边形MNQP为平行四边形?请说明理由;(3)如图3,连接CQ,AQ,试判断AQ、CQ的位置关系并加以证明.2018-2019学年江西省赣州市宁都县八年级(下)期中数学试卷参考答案与试题解析一、选择题(本大题共6个小题,每小题3分,共18分,每小题只有一个正确选项)1.(3分)使有意义的x的取值范围是()A.x≤3B.x<3C.x≥3D.x>3【分析】先根据二次根式有意义的条件列出关于x的不等式,求出x的取值范围即可.【解答】解:∵式子有意义,∴x﹣3≥0,解得x≥3.故选:C.【点评】本题考查的是二次根式有意义的条件,熟知被开方数具有非负性是解答此题的关键.2.(3分)化简的结果正确的是()A.﹣2B.2C.±2D.4【分析】根据=|a|计算即可.【解答】解:原式=|﹣2|=2.故选:B.【点评】本题考查了二次根式的性质与化简:=|a|.3.(3分)下列各组数中,不能构成直角三角形的一组是()A.3,4,5B.1,2,C.5,12,13D.6,8,12【分析】由勾股定理的逆定理,只要验证两小边的平方和等于最长边的平方即可.【解答】解:A、32+42=52,能构成直角三角形;B、12+()2=22,能构成直角三角形;C、52+122=132,能构成直角三角形;D、62+82≠122,不能构成直角三角形.故选:D.【点评】本题考查勾股定理的逆定理的应用.判断三角形是否为直角三角形,已知三角形三边的长,只要利用勾股定理的逆定理加以判断即可.4.(3分)如图,▱ABCD的周长为36,对角线AC、BD相交于点O,点E是CD的中点,BD=12,则△DOE的周长为()A.15B.18C.21D.24【分析】利用平行四边形的性质,三角形中位线定理即可解决问题;【解答】解:∵平行四边形ABCD的周长为36,∴BC+CD=18,∵OD=OB,DE=EC,∴OE+DE=(BC+CD)=9,∵BD=12,∴OD=BD=6,∴△DOE的周长为9+6=15,故选:A.【点评】本题考查平行四边形的性质、三角形的中位线定理等知识,解题的关键是熟练掌握三角形中位线定理,属于中考常考题型.5.(3分)如图,菱形ABCD的对角线AC、BD的长分别为6和8,则这个菱形的周长是()A.20B.24C.40D.48【分析】由菱形对角线的性质,相互垂直平分即可得出菱形的边长,菱形四边相等即可得出周长.【解答】解:由菱形对角线性质知,AO=AC=3,BO=BD=4,且AO⊥BO,则AB==5,故这个菱形的周长L=4AB=20.故选:A.【点评】本题考查了菱形面积的计算,考查了勾股定理在直角三角形中的运用,考查了菱形各边长相等的性质,本题中根据勾股定理计算AB的长是解题的关键,难度一般.6.(3分)如图,在矩形AOBC中,O为坐标原点,OA、OB分别在x轴、y轴上,点B 的坐标为(0,3),∠ABO=30°,将△ABC沿AB所在直线对折后,点C落在点D 处,则点D的坐标为()A.(,)B.(2,)C.(,)D.(,3﹣)【分析】根据翻折变换的性质结合锐角三角函数关系得出对应线段长,进而得出D点坐标.【解答】解:∵四边形AOBC是矩形,∠ABO=30°,点B的坐标为(0,3),∴AC=OB=3,∠CAB=30°,∴BC=AC•tan30°=3×=3,∵将△ABC沿AB所在直线对折后,点C落在点D处,∴∠BAD=30°,AD=3,过点D作DM⊥x轴于点M,∵∠CAB=∠BAD=30°,∴∠DAM=30°,∴DM=AD=,∴AM=3×cos30°=,∴MO=﹣3=,∴点D的坐标为(,).故选:A.【点评】此题主要考查了翻折变换以及矩形的性质和锐角三角函数关系,正确得出∠DAM =30°是解题关键.二、填空题(本大题共6小题,每小题3分,共18分.)7.(3分)与最简二次根式5是同类二次根式,则a=2.【分析】先将化成最简二次根式,然后根据同类二次根式得到被开方数相同可得出关于a的方程,解出即可.【解答】解:∵与最简二次根式是同类二次根式,且,∴a+1=3,解得:a=2.故答案为2.【点评】本题考查了同类二次根式的定义:化成最简二次根式后,被开方数相同,这样的二次根式叫做同类二次根式.8.(3分)计算(2+3)(2﹣3)的结果等于﹣3.【分析】利用平方差公式计算.【解答】解:原式=24﹣27=﹣3.故答案为﹣3.【点评】本题考查了二次根式的混合运算:先把二次根式化为最简二次根式,然后合并同类二次根式即可.在二次根式的混合运算中,如能结合题目特点,灵活运用二次根式的性质,选择恰当的解题途径,往往能事半功倍.9.(3分)一个三角形的三边分别是、1、,这个三角形的面积是.【分析】首先根据勾股定理逆定理可判定此三角形是直角三角形,然后再计算面积即可.【解答】解:∵()2+12=3=()2,∴这个三角形是直角三角形,∴面积为:×1×=,故答案为:.【点评】此题主要考查了二次根式的应用以及勾股定理逆定理,关键是正确判断出三角形的形状.10.(3分)在Rt△ABC中,∠C=90°,∠A=30°,AB=6,则AC=3.【分析】利用“在直角三角形中,30°角所对的直角边等于斜边的一半”可求出BC的长度,再利用勾股定理即可求出AC的长度.【解答】解:依照题意画出图形,如图所示.在Rt△ABC中,∠C=90°,∠A=30°,AB=6,∴BC=AB=3,∴AC==3.故答案为:3.【点评】本题考查了含30度角的直角三角形以及勾股定理,牢记“在直角三角形中,30°角所对的直角边等于斜边的一半”是解题的关键.11.(3分)当2≤3x+5≤8时,化简+=6.【分析】直接求出x的取值范围,进而化简二次根式得出答案.【解答】解:∵2≤3x+5≤8,∴﹣1≤x≤1,∴+=3﹣x+x+3=6.故答案为:6.【点评】此题主要考查了二次根式的性质与化简,正确掌握二次根式的性质是解题关键.12.(3分)已知:矩形ABCD,AB=5,BC=4,P是边CD上一点,当△PAB是等腰三角形时,求PC的长可以是 2.5或3或2.【分析】三种情况:①PA=PB,求出P在AB的垂直平分线上,即可求出DP,进而得出CP;②PA=AB=5,根据勾股定理求出DP,进而得出CP;③PB=BA=5,同法求出CP.【解答】解:有三种情况:①PA=PB,∵P在AB的垂直平分线上,∴DP=PC=×5=2.5;②PA=AB=5,∵矩形ABCD,∴∠D=90°;由勾股定理得:DP=,∴CP=5﹣3=2,③PB=BA=5,同法求出CP=3,故答案为:2.5或3或2.【点评】本题主要考查对矩形的性质,勾股定理,线段的垂直平分线性质,等腰三角形的性质等知识点的理解和掌握,能求出符合条件的所有情况是解此题的关键.三、(本大题共5小题,每小题6分,共30分)13.(6分)计算:(1)+|﹣2|﹣()﹣1(2)4+﹣+4【分析】(1)根据分母有理化、绝对值的意义和负整数指数幂的意义计算;(2)先把二次根式化为最简二次根式,然后合并即可.【解答】解:(1)原式=+2﹣﹣2=0;(2)原式=4+3﹣2+4=7+2.【点评】本题考查了二次根式的混合运算:先把二次根式化为最简二次根式,然后合并同类二次根式即可.在二次根式的混合运算中,如能结合题目特点,灵活运用二次根式的性质,选择恰当的解题途径,往往能事半功倍.14.(6分)长方形的长是3+2,宽是3﹣2,求长方形的周长与面积.【分析】根据长方形的周长公式:2×(长+宽),面积公式:长×宽进行计算即可.【解答】解:周长:2[(3+2)+(3﹣2)],=2(3+2+3﹣2),=2×6,=12;面积:(3+2)×(3﹣2)=45﹣12=36.【点评】此题主要考查了二次根式的应用,关键是掌握长方形的周长和面积计算公式,掌握二次根式的加减和乘法计算.15.(6分)如图,一架梯子长2.5米,斜靠在一面墙上,梯子底端离墙0.7米,如果梯子的顶端下滑0.4米,那么梯子的底部在水平方向上滑动了多少米?【分析】根据梯子长度不会变这个等量关系,我们可以根据BC求AC,根据AD、AC求CD,根据CD计算CE,根据CE,BC计算BE,即可解题.【解答】解:由题意知AB=DE=2.5米,BC=0.7米,AD=0.4米,∵在直角△ABC中,AC为直角边,∴AC==2.4米,已知AD=0.4米,则CD=2.4﹣0.4=2(米),∵在直角△CDE中,CE为直角边∴CE==1.5(米),BE=1.5米﹣0.7米=0.8米.答:梯子的底部在水平方向上滑动了0.8米.【点评】本题考查了勾股定理在实际生活中的运用,考查了直角三角形中勾股定理的运用,本题中正确的使用勾股定理求CE的长度是解题的关键.16.(6分)已知:如图,四边形ABCD是菱形,F是AB上一点,DF交AC于E.求证:∠AFD=∠CBE.【分析】根据菱形的性质得出∠BCE=∠DCE,BC=CD,AB∥CD,推出∠AFD=∠CDE,证△BCE≌△DCE,推出∠CBE=∠CDE即可.【解答】证明:∵四边形ABCD是菱形,∴∠BCE=∠DCE,BC=CD,AB∥CD,∴∠AFD=∠CDE,在△BCE和△DCE中∴△BCE≌△DCE,∴∠CBE=∠CDE,∵∠AFD=∠CDE,∴∠AFD=∠CBE.【点评】此题主要考查了菱形的判定与性质以及全等三角形的判定与性质等知识,得出△BCE≌△DCE是解题关键.17.(6分)如图,在▱ABCD中,AB=10,AD=6,AC⊥BC.求BD的长度.【分析】由BC⊥AC,AB=10,BC=AD=6,由勾股定理求得AC的长,得出OA长,然后由勾股定理求得OB的长即可.【解答】解:∵四边形ABCD是平行四边形,∴BC=AD=6,OB=OD,OA=OC,∵AC⊥BC,∴AC===8,∴OC=4,∴OB===2,∴BD=2OB=4.【点评】此题考查了平行四边形的性质以及勾股定理,熟练掌握平行四边形的性质,由勾股定理求出OB是解题关键.四、(本大题共3小题,每小题8分,共24分).18.(8分)《九章算术》是我国古代最重要的数学著作之一,在“勾股”章中记载了一道“折竹抵地”问题:“今有竹高一丈,末折抵地,去本三尺,问折者高几何?”可翻译为:有一根竹子高一丈,今在A处折断,竹梢落在地面的B处,B与竹根部C相距3尺,求折断点A与地面的高度AC.(注:1丈=10尺)【分析】设AC=x,可知AB=10﹣x,再根据勾股定理即可得出结论.【解答】解:设AC=x,∵AC+AB=10,∴AB=10﹣x.∵在Rt△ABC中,∠ACB=90°,∴AC2+BC2=AB2,即x2+32=(10﹣x)2.解得:x=4.55,即AC=4.55.【点评】本题考查的是勾股定理的应用,在应用勾股定理解决实际问题时勾股定理与方程的结合是解决实际问题常用的方法,关键是从题中抽象出勾股定理这一数学模型,画出准确的示意图.领会数形结合的思想的应用.19.(8分)如图,四边形ABCD是正方形,△EBC是等边三角形.(1)求证:△ABE≌△DCE;(2)求∠AED的度数.【分析】(1)根据正方形、等边三角形的性质,可以得到AB=BE=CE=CD,∠ABE =∠DCE=30°,由此即可证明;(2)只要证明∠EAD=∠ADE=15°,即可解决问题;【解答】(1)证明:∵四边形ABCD是正方形,△EBC是等边三角形,∴BA=BC=CD=BE=CE,∠ABC=∠BCD=90°,∠EBC=∠ECB=60°,∴∠ABE=∠ECD=30°,在△ABE和△DCE中,,∴△ABE≌△DCE(SAS).(2)∵BA=BE,∠ABE=30°,∴∠BAE=(180°﹣30°)=75°,∵∠BAD=90°,∴∠EAD=90°﹣75°=15°,同理可得∠ADE=15°,∴∠AED=180°﹣15°﹣15°=150°.【点评】本题考查正方形的性质、全等三角形的判定和性质、等边三角形的判定和性质等知识,解题的关键是正确寻找全等三角形解决问题.属于中考常考题型.20.(8分)如图,已知△ABC是等边三角形,点D、F分别在线段BC、AB上,DC=BF,以BF为边在△ABC外作等边三角形BEF.(1)求证:四边形EFCD是平行四边形.(2)△ABC的边长是6,当点D是BC三等分点时,直接写出平行四边形CDEF的面积.【分析】(1)由△ABC是等边三角形得到∠B=60°,而∠EFB=60°,由此可以证明EF∥DC,而DC=EF,然后即可证明四边形EFCD是平行四边形;(2)过E作EH⊥BC交CB的延长线于H,解直角三角形得到EH=BE=BF=CD,根据平行四边形的面积公式即可得到结论.【解答】证明:(1)∵△ABC是等边三角形,∴∠ABC=60°,∵∠EFB=60°,∴∠ABC=∠EFB,∴EF∥DC(内错角相等,两直线平行),∵DC=EF,∴四边形EFCD是平行四边形;(2)解:过E作EH⊥BC交CB的延长线于H,∵△ABC和△BEF是等边三角形,∴∠ABC=∠EBF=60°,∴∠EBH=180°﹣60°﹣60°=60°,∴EH=BE=BF=CD,∵点D是BC三等分点,∴当CD=BC=2时,平行四边形CDEF的面积=2×=2,当CD=BC=4时,平行四边形CDEF的面积=4×2=8,综上所述,平行四边形CDEF的面积为2或8.【点评】本题考查了等边三角形的性质,平行四边形的判定与性质,熟记各性质与判定方法并准确识图是解题的关键.五、(本大题共2小题,每小题9分,共18分)21.(9分)对于形如的式子可以用如下的方法化简:===+.请仿照这样的方法,解决下列问题.(1)化简:(2)化简求值:已知x=,求(+)•【分析】(1)根据二次根式的性质化简即可;(2)根据分式的混合运算的法则计算即可.【解答】解:(1)===2+;(2)(+)•=×=,∵x===﹣1,∴原式=.【点评】本题考查了分式的化简求值,二次根式的性质,熟练掌握分式的混合运算的法则是解题的关键.22.(9分)如图,在菱形ABCD中,对角线AC与BD交于点O.过点C作BD的平行线,过点D作AC的平行线,两直线相交于点E.(1)求证:四边形OCED是矩形;(2)若CE=1,DE=2,则菱形ABCD的面积是4.【分析】(1)欲证明四边形OCED是矩形,只需推知四边形OCED是平行四边形,且有一内角为90度即可;(2)由菱形的对角线互相垂直平分和菱形的面积公式解答.【解答】(1)证明:∵四边形ABCD是菱形,∴AC⊥BD,∴∠COD=90°.∵CE∥OD,DE∥OC,∴四边形OCED是平行四边形,又∠COD=90°,∴平行四边形OCED是矩形;(2)由(1)知,平行四边形OCED是矩形,则CE=OD=1,DE=OC=2.∵四边形ABCD是菱形,∴AC=2OC=4,BD=2OD=2,∴菱形ABCD的面积为:AC•BD=×4×2=4.故答案是:4.【点评】考查了矩形的判定与性质,菱形的性质.此题中,矩形的判定,首先要判定四边形是平行四边形,然后证明有一内角为直角.六、(本大题共12分)23.(12分)在矩形ABCD 中,AB =6,BC =8,点E 为BC 延长线上一点,且BD =BE ,连接DE ,Q 为DE 的中点,有一动点P 从B 点出发,沿BC 以每秒1个单位的速度向E 点运动,运动时间为t 秒.(1)如图1,连接DP 、PQ ,则S △DPQ = 15﹣t (用含t 的式子表示);(2)如图2,M 、N 分别为AB 、AD 的中点,当t 为何值时,四边形MNQP 为平行四边形?请说明理由;(3)如图3,连接CQ ,AQ ,试判断AQ 、CQ 的位置关系并加以证明.【分析】(1)由勾股定理可求BD =10,由三角形的面积公式和S △DPQ =(S △BED ﹣S △BDP )可求解;(2)当t =5时,可得BP =5=BE ,由中位线定理可得MN ∥BD ,MN =BD =5,PQ ∥BD ,PQ =BD =5,可得MN ∥PQ ,MN =PQ ,可得结论.(3)连接BQ ,由等腰三角形的性质可得∠AQD +∠BQA =90°,由直角三角形的性质可得DQ =CQ ,∠DCQ =∠CDQ ,由“SAS ”可证△ADQ ≌△BCQ ,可得∠AQD =∠BQC ,即可得结论.【解答】解:(1)∵四边形ABCD 是矩形,AB =6,BC =8,∴BC =8,CD =6,∴BD ==10∴BD =BE =10 ∵Q 为DE 的中点,∴S △DPQ =S △DPE ,∴S △DPQ =(S △BED ﹣S △BDP )==15﹣t 故答案为:15﹣t(2)当t =5时,四边形MNQP 为平行四边形, 理由如下:∵M 、N 分别为AB 、AD 的中点, ∴MN ∥BD ,MN =BD =5,∵t =5时,∴BP =5=BE ,且点Q 是DE 的中点, ∴PQ ∥BD ,PQ =BD =5∴MN ∥PQ ,MN =PQ∴四边形MNQP 是平行四边形(3)AQ ⊥CQ理由如下:如图,连接BQ ,∵BD =BE ,点Q 是DE 中点,∴BQ ⊥DE ,∴∠AQD +∠BQA =90°∵在Rt △DCE 中,点Q 是DE 中点, ∴DQ =CQ ,∴∠DCQ =∠CDQ ,且∠ADC =∠BCD =90° ∴∠ADQ =∠BCQ ,且BC =AD ,DQ =CQ ∴△ADQ ≌△BCQ (SAS )∴∠AQD =∠BQC ,且∴∠AQD +∠BQA =90° ∴∠BQC +∠BQA =90°∴∠AQC =90°∴AQ⊥CQ【点评】本题是四边形综合题,考查了矩形的性质,勾股定理,平行四边形的判定和性质,全等三角形的判定和性质,中位线定理,等腰三角形的性质,证明∠AQD=∠BQC 是本题的关键.最新八年级(下)期中考试数学试题(含答案)一、选择题(本大题共6个小题,每小题3分,共18分,每小题只有一个正确选项)1.(3分)使有意义的x的取值范围是()A.x≤3B.x<3C.x≥3D.x>32.(3分)化简的结果正确的是()A.﹣2B.2C.±2D.43.(3分)下列各组数中,不能构成直角三角形的一组是()A.3,4,5B.1,2,C.5,12,13D.6,8,12 4.(3分)如图,▱ABCD的周长为36,对角线AC、BD相交于点O,点E是CD的中点,BD=12,则△DOE的周长为()A.15B.18C.21D.245.(3分)如图,菱形ABCD的对角线AC、BD的长分别为6和8,则这个菱形的周长是()A.20B.24C.40D.486.(3分)如图,在矩形AOBC中,O为坐标原点,OA、OB分别在x轴、y轴上,点B 的坐标为(0,3),∠ABO=30°,将△ABC沿AB所在直线对折后,点C落在点D处,则点D的坐标为()A.(,)B.(2,)C.(,)D.(,3﹣)二、填空题(本大题共6小题,每小题3分,共18分.)7.(3分)与最简二次根式5是同类二次根式,则a=.8.(3分)计算(2+3)(2﹣3)的结果等于.9.(3分)一个三角形的三边分别是、1、,这个三角形的面积是.10.(3分)在Rt△ABC中,∠C=90°,∠A=30°,AB=6,则AC=.11.(3分)当2≤3x+5≤8时,化简+=.12.(3分)已知:矩形ABCD,AB=5,BC=4,P是边CD上一点,当△PAB是等腰三角形时,求PC的长可以是.三、(本大题共5小题,每小题6分,共30分)13.(6分)计算:(1)+|﹣2|﹣()﹣1(2)4+﹣+414.(6分)长方形的长是3+2,宽是3﹣2,求长方形的周长与面积.15.(6分)如图,一架梯子长2.5米,斜靠在一面墙上,梯子底端离墙0.7米,如果梯子的顶端下滑0.4米,那么梯子的底部在水平方向上滑动了多少米?16.(6分)已知:如图,四边形ABCD是菱形,F是AB上一点,DF交AC于E.求证:∠AFD=∠CBE.17.(6分)如图,在▱ABCD中,AB=10,AD=6,AC⊥BC.求BD的长度.四、(本大题共3小题,每小题8分,共24分).18.(8分)《九章算术》是我国古代最重要的数学著作之一,在“勾股”章中记载了一道“折竹抵地”问题:“今有竹高一丈,末折抵地,去本三尺,问折者高几何?”可翻译为:有一根竹子高一丈,今在A处折断,竹梢落在地面的B处,B与竹根部C相距3尺,求折断点A与地面的高度AC.(注:1丈=10尺)19.(8分)如图,四边形ABCD是正方形,△EBC是等边三角形.(1)求证:△ABE≌△DCE;(2)求∠AED的度数.20.(8分)如图,已知△ABC是等边三角形,点D、F分别在线段BC、AB上,DC=BF,以BF为边在△ABC外作等边三角形BEF.(1)求证:四边形EFCD是平行四边形.(2)△ABC的边长是6,当点D是BC三等分点时,直接写出平行四边形CDEF的面积.五、(本大题共2小题,每小题9分,共18分)21.(9分)对于形如的式子可以用如下的方法化简:===+.请仿照这样的方法,解决下列问题.(1)化简:(2)化简求值:已知x=,求(+)•22.(9分)如图,在菱形ABCD中,对角线AC与BD交于点O.过点C作BD的平行线,过点D作AC的平行线,两直线相交于点E.(1)求证:四边形OCED是矩形;(2)若CE=1,DE=2,则菱形ABCD的面积是.六、(本大题共12分)23.(12分)在矩形ABCD中,AB=6,BC=8,点E为BC延长线上一点,且BD=BE,连接DE,Q为DE的中点,有一动点P从B点出发,沿BC以每秒1个单位的速度向E 点运动,运动时间为t秒.(1)如图1,连接DP、PQ,则S=(用含t的式子表示);△DPQ(2)如图2,M、N分别为AB、AD的中点,当t为何值时,四边形MNQP为平行四边形?请说明理由;(3)如图3,连接CQ,AQ,试判断AQ、CQ的位置关系并加以证明.2018-2019学年江西省赣州市宁都县八年级(下)期中数学试卷参考答案与试题解析一、选择题(本大题共6个小题,每小题3分,共18分,每小题只有一个正确选项)1.(3分)使有意义的x的取值范围是()A.x≤3B.x<3C.x≥3D.x>3【分析】先根据二次根式有意义的条件列出关于x的不等式,求出x的取值范围即可.【解答】解:∵式子有意义,∴x﹣3≥0,解得x≥3.故选:C.【点评】本题考查的是二次根式有意义的条件,熟知被开方数具有非负性是解答此题的关键.2.(3分)化简的结果正确的是()A.﹣2B.2C.±2D.4【分析】根据=|a|计算即可.【解答】解:原式=|﹣2|=2.故选:B.【点评】本题考查了二次根式的性质与化简:=|a|.3.(3分)下列各组数中,不能构成直角三角形的一组是()A.3,4,5B.1,2,C.5,12,13D.6,8,12【分析】由勾股定理的逆定理,只要验证两小边的平方和等于最长边的平方即可.【解答】解:A、32+42=52,能构成直角三角形;B、12+()2=22,能构成直角三角形;C、52+122=132,能构成直角三角形;D、62+82≠122,不能构成直角三角形.故选:D.【点评】本题考查勾股定理的逆定理的应用.判断三角形是否为直角三角形,已知三角形三边的长,只要利用勾股定理的逆定理加以判断即可.4.(3分)如图,▱ABCD的周长为36,对角线AC、BD相交于点O,点E是CD的中点,BD=12,则△DOE的周长为()A.15B.18C.21D.24【分析】利用平行四边形的性质,三角形中位线定理即可解决问题;【解答】解:∵平行四边形ABCD的周长为36,∴BC+CD=18,∵OD=OB,DE=EC,∴OE+DE=(BC+CD)=9,∵BD=12,∴OD=BD=6,∴△DOE的周长为9+6=15,故选:A.【点评】本题考查平行四边形的性质、三角形的中位线定理等知识,解题的关键是熟练掌握三角形中位线定理,属于中考常考题型.5.(3分)如图,菱形ABCD的对角线AC、BD的长分别为6和8,则这个菱形的周长是()A.20B.24C.40D.48【分析】由菱形对角线的性质,相互垂直平分即可得出菱形的边长,菱形四边相等即可得出周长.【解答】解:由菱形对角线性质知,AO=AC=3,BO=BD=4,且AO⊥BO,则AB==5,故这个菱形的周长L=4AB=20.故选:A.【点评】本题考查了菱形面积的计算,考查了勾股定理在直角三角形中的运用,考查了菱形各边长相等的性质,本题中根据勾股定理计算AB的长是解题的关键,难度一般.6.(3分)如图,在矩形AOBC中,O为坐标原点,OA、OB分别在x轴、y轴上,点B 的坐标为(0,3),∠ABO=30°,将△ABC沿AB所在直线对折后,点C落在点D 处,则点D的坐标为()A.(,)B.(2,)C.(,)D.(,3﹣)【分析】根据翻折变换的性质结合锐角三角函数关系得出对应线段长,进而得出D点坐标.【解答】解:∵四边形AOBC是矩形,∠ABO=30°,点B的坐标为(0,3),∴AC=OB=3,∠CAB=30°,∴BC=AC•tan30°=3×=3,∵将△ABC沿AB所在直线对折后,点C落在点D处,∴∠BAD=30°,AD=3,过点D作DM⊥x轴于点M,∵∠CAB=∠BAD=30°,∴∠DAM=30°,∴DM=AD=,∴AM=3×cos30°=,∴MO=﹣3=,∴点D的坐标为(,).故选:A.【点评】此题主要考查了翻折变换以及矩形的性质和锐角三角函数关系,正确得出∠DAM =30°是解题关键.二、填空题(本大题共6小题,每小题3分,共18分.)7.(3分)与最简二次根式5是同类二次根式,则a=2.【分析】先将化成最简二次根式,然后根据同类二次根式得到被开方数相同可得出关于a的方程,解出即可.【解答】解:∵与最简二次根式是同类二次根式,且,∴a+1=3,解得:a=2.故答案为2.【点评】本题考查了同类二次根式的定义:化成最简二次根式后,被开方数相同,这样的二次根式叫做同类二次根式.8.(3分)计算(2+3)(2﹣3)的结果等于﹣3.【分析】利用平方差公式计算.【解答】解:原式=24﹣27=﹣3.故答案为﹣3.【点评】本题考查了二次根式的混合运算:先把二次根式化为最简二次根式,然后合并同类二次根式即可.在二次根式的混合运算中,如能结合题目特点,灵活运用二次根式的性质,选择恰当的解题途径,往往能事半功倍.9.(3分)一个三角形的三边分别是、1、,这个三角形的面积是.【分析】首先根据勾股定理逆定理可判定此三角形是直角三角形,然后再计算面积即可.【解答】解:∵()2+12=3=()2,∴这个三角形是直角三角形,∴面积为:×1×=,故答案为:.【点评】此题主要考查了二次根式的应用以及勾股定理逆定理,关键是正确判断出三角形的形状.10.(3分)在Rt△ABC中,∠C=90°,∠A=30°,AB=6,则AC=3.【分析】利用“在直角三角形中,30°角所对的直角边等于斜边的一半”可求出BC的长度,再利用勾股定理即可求出AC的长度.【解答】解:依照题意画出图形,如图所示.在Rt△ABC中,∠C=90°,∠A=30°,AB=6,∴BC=AB=3,∴AC==3.故答案为:3.【点评】本题考查了含30度角的直角三角形以及勾股定理,牢记“在直角三角形中,30°角所对的直角边等于斜边的一半”是解题的关键.11.(3分)当2≤3x+5≤8时,化简+=6.【分析】直接求出x的取值范围,进而化简二次根式得出答案.【解答】解:∵2≤3x+5≤8,∴﹣1≤x≤1,∴+=3﹣x+x+3=6.故答案为:6.【点评】此题主要考查了二次根式的性质与化简,正确掌握二次根式的性质是解题关键.12.(3分)已知:矩形ABCD,AB=5,BC=4,P是边CD上一点,当△PAB是等腰三角形时,求PC的长可以是 2.5或3或2.【分析】三种情况:①PA=PB,求出P在AB的垂直平分线上,即可求出DP,进而得出CP;②PA=AB=5,根据勾股定理求出DP,进而得出CP;③PB=BA=5,同法求出CP.【解答】解:有三种情况:①PA=PB,∵P在AB的垂直平分线上,∴DP=PC=×5=2.5;②PA=AB=5,∵矩形ABCD,∴∠D=90°;由勾股定理得:DP=,∴CP=5﹣3=2,③PB=BA=5,同法求出CP=3,故答案为:2.5或3或2.【点评】本题主要考查对矩形的性质,勾股定理,线段的垂直平分线性质,等腰三角形的性质等知识点的理解和掌握,能求出符合条件的所有情况是解此题的关键.三、(本大题共5小题,每小题6分,共30分)13.(6分)计算:(1)+|﹣2|﹣()﹣1(2)4+﹣+4【分析】(1)根据分母有理化、绝对值的意义和负整数指数幂的意义计算;(2)先把二次根式化为最简二次根式,然后合并即可.。
2018—2019学年度第一学期期中测试卷
2018—2019学年度第一学期期中测试卷八年级(初二)英语听力材料、参考答案及评分意见一、听力 (共25分)A)请听下面8段对话。
每段对话后有一小题,从题中所给的A、B、C、三个选项中选出最佳选项。
听完每段对话后,你都将有10秒钟的时间回答有关小题和阅读下一小题。
每段对话读两遍。
(每题1分)1. M: Did you visit the museum last weekend, Shirley?W: No, 1 didn’t. I just stayed at home. I didn’t feel well.2.M: What does Billy usually do on weekends?W: He usually goes to the movies. But his brother Jim often reads books on weekends.3.M: Do you know where Karen is?W: She is in the library. She goes there every day.4.W: Sam, what about watching a movie?M: It’s too boring. I want to read a book.5.W: Why didn’t you go to watch the football match , Tom?M: I’d like to go. But my mother asked me to look after our dog. It was ill.6.M: Emma, you and Jenny both have blue eyes and black hair.W: Yes but I have long curly hair and she has short straight hair.7.M: Hi, I’m doing a survey for the city newspaper. What’s the best clothing store in town?W: Hmm, I think Jason’s is the best.8. W: Did you do anything new on your trip, Dale?M: Yeah! I tried paragliding and swimming.B)请听下面4段对话或独白。
2018-2019上海市民办华育中学八年级期中考试试卷(无听力)
2018-2019上海市民办华育中学八年级期中考试试卷Part II V ocabulary and GrammarI. Choose the best answer. 20%26. Be careful not to wake the baby.A. /keə’fl/B. /kiə’fl/C. /’keəfl/D. /’kiəfl/27. Which of the following underlined parts is different in pronunciation from others?A. She was standing o n one foot.B. I won’t leave u ntil you come back.C. She was unable to c o ntain her excitement.D. Who will pay the electricity bill?28. A little boy wrote “u” and “n” on the wall.A. a; anB.an; aC.an; anD. a; a29. I have lost my pen. I must buy today.A. itB. thisC. oneD. that30. Y ou’ve got so many books. Could you please lend me to read?A. anythingB. anyC. somethingD. some31. They’ve taken everything with .A. themB. themselvesC. theyD. their32. She had to borrow a new in order to attend the party.A. clothB. clothesC. clothingD. dress33. useful information board you have made!A. HowB. WhatC. How aD. What a34. I am not sure how long Oliver .A. has joined the armyB. has joined in the armyC. has served the armyD. has served in the army35. What is the chemical symbol water?A. aboutB. ofC. onD. for36. a father, she has a younger brother to support.A. BesideB. BesidesC. ExceptD. Except for37. I hate to admit it, I think I was wrong.A. andB. butC. orD. so38. He’s an engineer, he can deal with problems.A. electricity, electricalB. electrical, electricalC. electrical, electricD. electrical, electricity39. History repeat itself.A. needs notB. need notC. doesn’t needD. need not to40. What did you about water pollution at the meeting?A. talkB. sayC. speakD. tell41. In the past few years, great changes in Shanghai.A. there wereB. there have hadC. there had beenD. there have been42. Joyce suggested .A. them talk it over among themselvesB. them talked it over among themselvesC. they talk it over among themselvesD. they talked it over among themselves43. Where do you think T onny the jacket?A. did, buyB. did, boughtC. has, boughtD. /, bought44. Which sentence is correct?A. I wonder where you have gone.B. I wonder where they visited.C. I wonder when you have finished the task.D. I wonder what is the matter with you.45. -- John and I will celebrate our fortieth wedding anniversary next month.-- Oh, !A. cheer upB. well doneC. go aheadD. congratulationsII. Fill in the blanks with the proper forms of the words: 7%46. They have both behaved than before and I am very hurt. (bad)47. Y ou can reduce these long to simple charts or diagrams. (explain)48. In cold weather, everything seems to be frozen. (freeze)49. Our government is trying to take to prevent and control pollution. (measure)50. My father exercises because he doesn’t have enough time. (regular)51. They do not have the to apologize for their actions. (encourage)52. A friend is a living treasure, and if you have one, you have one of the gifts in life. (value)III. Fill in the blanks with the verbs in their proper forms: 7%53. Such negative thoughts and feelings make some people feel like up.(give)54. I didn’t know a thing about the verbs, for I my lesson. (not study)55. The miners alive when the tunnel collapsed. (bury)56. Look! Jerry and he belongs to a ski club. (ski)57. I hope you the secret of how to be happy. (find)58. I don’t think Renee saw us. She a watch for her father. (choose)59. Let us hold our hands and the environment. (not pollute)IV. Rewrite the sentences as required: 6%60 . D a i s yw a s t o l d n o Daisy was told not to eat sweets any more, ?61 .T h ed o c t o The wounded good care of by the doctor.62 .Id o n ’t I don’t know go with you tomorrow.63 . L i f ei n o will life in our cities without electricity?64 .B e n Benny wanted to his sister.65. machine, makes, kinds, works, it, goods, the, of, that, all(连词成句)V. Complete the following passage with the words or phrases in the box. Each word or phrase can only be usedMore Than a Ride to SchoolThe National Education Association claims. “The school bus is a mirror of the community.” They further add that, unfortunately, what appears on the exterior does not always reflect the reality of a chosen community. They are right--- sometimes it reflects more! Just ask Liesl Denson. Riding the school bus has been more than a ride to school for Liesl. Bruce Hardy. school bus driver for Althouse BUS Company has been Liesl’s bus driver since kindergarten. Last year when Liesl’s family moved to Parkesburg, 66 her bus went by her new residence, she requested to ride the same bus.This year Liesl is a senior and will enjoy her last year riding the bus. She sa ys, “It’s been a great ride 67 ! My bus driver is so cool and has always been a good friend and a good listener. Sometimes when you’r e a child, adults do not think that what you have to say is important. Mr. Hardy always listens to what you have to say and makes you feel important.” Her friends Ashley Batista and Amanda W olfe agree 68what Liesl said. Bruce Hardy has been making Octorara students feel special since 1975. This year he will celebrate 40 years working for Althouse Bus Company. Larry Althouse, president of the company, acknowledges Bruce Hardy’s outstanding record, “Y ou do not come by employees like Bruce these days. He has never missed a day of work and has a perfect driving record. He was recognized in 2000 by the Pennsylvania School Bus Association for driving 350,000 accidentfree miles. Hardy’s reputation is made 69 evident through the relationships he has made with the students that ride his bus.”Althouse further adds, “Althouse Bus Company was established 70 years ago and has been providing quality transportation 70 . My grandfather started the business with one bus. Althouse Bus Company is delighted to have the opportunity to bring distinctive and safe service to our local school and community and looks forward to continuing to provide quality service for many more years to com e.”Three generations of business is not all the company has enjoyed. Thanks 71 drivers like Bruce Hardy, they have been building relationships through generations, Liesl’s mother Carol also enjoys fond memories of riding Bruce Hardy’s bus to the Octorara School District.Part III Reading and WritingA. Choose the best answer 5%The Exploding Lakes of CameroonWhat comes to mind when you think of a lake? Y ou probably imagine a pretty scene with blue water, birds, and fish. For the people in the northwestern Cameroon, however, the image is very different. For them, lakes may mean terrible disasters. In 1984, poisonous gases exploded out of Lake Monoun and came down into the nearby villages, killing thirty -- seven people. T wo years later, Lake Nyos erupted a cloud of gases rolled down the hills and into the valleys and killed1,700 people.Lake Nyos and Lake Monoun are crater (火山口) lakes. They were formed when water collected in the craters of old volcanoes. The volcanoes under Lake Nyos and Lake Monoun are not active anymore. However, poisonous gases from the center of the earth continue to flow up through cracks in the bottom of the lake. This is normal in a crater lake. In most crater lakes, these gases are released often because the water ‘t urns over’ regularly. That is, the water from the bottom of the lake rises and mixes with the water at the top, allowing the gases to escape slowly.However, in Lakes Nyos and Monoun, there is no regular turning over. No one knows the reason for this fact, but as a result, these lakes have more gases tapped at the bottom than other crater lakes. In fact, scientists who have studied LakesNyos and Monoun have found 16,000 times more gases. When a strong wind, cool weather, a storm, or a landslide (滑坡)causes the water to turn over suddenly, the gases escape in a violent explosion.In the past, no one knew when the gases might explode, so there was no way for the villagers to escape disaster. Now scientists from the United States, France, and Cameroon have found a way to reduce the gas pressure at the bottom of Lake Nyos. They stood a 672-foot plastic pipe in the middle of the lake, with one end of the pipe near the bottom and the other end in the air. Near the top of the pipe, the team put several holes that could be opened or closed by a computer. Now, when the gas pressure gets too high, the holes are opened and some of the gas-filled water shoots up through the pipe into the air like a fountain. With less pressure, a disastrous explosion is much less likely. However, the scientists are not sure that one pipe will be enough to prevent explosions. They hope to put in others soon and they plan to install a similar pipe and a computer system at Lake Monoun as well.T o protect people nearby until all of the pipes are in place, the scientists have installed early warning systems at both lakes. If the gas pressure rises to a dangerous level, computers will set off loud sirens (警报) and bright lights to warn thepeople in the villages. That way, they will have time to escape from the dangerous gases.72. What will happen when Lake Nyos and Lake Monoun explode?A. W ater will flow down the hills.B. Poisonous gases will be released suddenly.C. A strong wind will rise from the lakes.D. The volcanoes will come to life.73. Which of the following statements about Lake Nyos and Lake Monoun is true?A. They were formed in 1984B. They are at the top of two active volcanoes.C. They are not like most other crater lakesD. W ater in them turns over regularly.74. Lake Nyos and Lake Monoun explode because .A. the gases rise to the top and mix with airB. people from the villages turn over the waterC. scientists have put in a computer systemD. they have more gases trapped at the bottom than other crater lakes75. A team of scientists has .A. erected a pressure-releasing pipe in the lakeB.identified the gases at the bottom of the lake C.built a beautiful fountain near the lakesD. removed all dangerous gases from the lakes76. What do we learn from the last paragraph?A. Scientists are planning to install pipes in all crater lakesB. Scientists still do not know how to prevent gas explosionsC. Explosion disasters could be avoided in the futureD. W arming systems have been set up in the villages nearby.B. Choose the words or expressions and complete the passage. 8%It was just getting dark; there was a touch of fog and I was on a lonely stretch of road. But I was going along cheerfully, thinking about the dinner I would eat when I got to Salisbury.I was going along quietly at about thirty-five miles an hour when suddenly I heard a scream, a woman’s scream –“Help!” I looked round, but the only 77 _ of life was a large, black, rather suspicious-looking(看起来可疑的) car just turninga bend in the road about a hundred yards away. That was 78 the cry had come from: I 79 speed and went after it. I thought the driver saw what I was doing, for he did the same and began to draw away from me. As I drew near,the girl’s voice came again, a lovely voice but trembling(发抖)with fear.“Let me go, you fool; you’r e hurting me. Oh! O h!”I felt my blood 80 _. The fog was coming down thicker now, the countryside was lonelier. The man in the car had no 81 noticed this. Again, came a cry.“Drop the knife, fool. Oh!” Then a cry and a groan.If I was to save her, it was now or 82 _. Perhaps even now I was too late. But if I couldn’t save the girl, I would 83_ try to bring the murderer to the police station. The car was only a couple of yards away now. I drove the bike right across its path, and its brakes screamed as the driver tried to pull it over and crashed into the ditch (沟渠) on the side of the road. The door of the car was pushed open angrily and a dark, evil-looking fellow stepped out, mad with anger.“Foo l!” he shouted _84_ he came towards me with his fist raised to hit me. But I was quicker than he. I put all I knew into a blow that would have knocked out Joe Louis. It caught him right on the ground without a sound. I rushed to the car, pulled the door and peered inside. There was no girl there. Suddenly from the back of the car came a voice.“Y ou have been listening to a radio play. Murder in Hollywood, with Mae Garbo and Clark T aylor. The news will follow immediately. “77. A. person B. sign C. figureD. form7 8A. how B. when C. what D. where7 9A. put aside B. put up C. put down D. put on8 0A. boil B. run C. come D. freeze8 1A. sign B. effort C. doubt D.troubles8 2A. late B. then C. ever D. never8 3A. at most B. at least C. at last D. at first8 4A. before B. after C as D. whileC. Read the passage and fill in the blanks with proper words 6%A Chimps(黑猩猩) will cooperate in certain ways, like gathering in war parties to protect their territory. But beyond the minimum requirements as social beings, they have little instinct (本能) to help one a 85 . Chimps in the wildseek food for themselves. Even chimp mothers regularly decline to share food with their children, who are able from a young age to gather their own food.In the laboratory, chimps don’t naturally share food either. If a chimp is put in a cage where he can pull in one plate of food for himself or, with no great effort, a plate that also provides food for a neighbor to the next cage, he will pull at random---he just does n’t care whether his neighbor gets fed or not. Chimps are truly selfish.Human children, on the other hand are extremely cooperative. From the earliest ages, they desire to help others, to share information and to participate in a 86 common goals. The psychologist Michael T omasello has studied this cooperativeness in a series of experiments with very young children. He finds that if babies aged 18 months see a worried adult with hands f 87 trying to open a door, almost all will immediately try to help.There are several reasons to believe that the urges to help, inform and share are not taught, but n _88_ possessed in young children. One is that these instincts appear at a very young age before most parents have started to trainreason isthat social intelligence d 89in children before their general cognitive(认知的)skills, at least when compared with chimps. In tests conducted by T omasello, the children did no better than the chimps on the physical world tests, but were considerably better at understanding the social world.The core of what children’s minds have and chimps’ don’t is what T omasello calls shared intentionality. Part of this ability is that they can infer what others know or are thinking. But b _90_ that, even very young children want to be part of a shared purpose. They actively seek to be part of a “we”, a g roup that intends to work toward a shared goal. D. Read the following passage and answer the questions 5%Being an astronaut sounds cool, doesn’t it? In space, they can do some pretty amazing things, like floating in zero gravity.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 in space. 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. “T ear s,” he said, “don’t fall off your eyes. They just stay there. “Be sides making your vision 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 astronaut s’eyes, and when tears suddenly wet the eyes, it can cause pain rather than comfort. “My right eye is painful like cr azy” F eustel 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 -- “W hen 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. W e usually take them for granted, 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 end up throwing up (呕吐) everything in their stomachs, according to the UK National Space Center.Thus perhaps it’s only space explorers who can honestly sa y: “Gravity, you’r e the best.”91. Crying isn’t more difficult in space than on the earth, is it?92. Who experienced that the tears in space caused pain rather than comfort?93. How do astronauts get rid of the tears in space?94. Why can’t astronauts burp in space?95. In the last paragraph, the writer says: perhaps it’s only space explorers who can honestly sa y: “Gravity, you’r e thebest. “Do you agree with the writer? Why or why not?E. Writing 10%Write a passage of at least 60 words on the topic. “The fun of learning _(English/painting/to play the piano/to play basketball..).Necessary points1. What’s your experience of learning _?2. Why do you think learning is fun?(注意:短文中不得出现考生的姓名、校名及其他相关信息,否则不予评分.)2018-2019上海市民办华育中学八年级期中考试试卷26-30 CAACD 31-35 ADDDD 36-40 BBBBB 41-45 DCDDD46. worse 47. explanations 48. freezing 49. measures 50. irregularly 51. courage 52. most valuable53. giving 54. hadn’t studied 55. were buried 56. is skiing 57. will find 58. was choosing 59. not pollute60. wasn’t she 61. were taken 62. whether to 63. What be like 64. play a trick on65. It works that the machine makes all kinds of goods.66-71: HFDGEA 72-76:BCAAC 77-81 BDDAC 82-84 DBC85.another 86.achieving 87.full 88.naturally 89.develops 90.besides91.No,it isn’t92. Astronaut Andrew Feustel.93. They rubbed their eyes against their helmet to wipe the tears away or wait until the tears getbig enough to simply break free of the eyes and floated around.94. Because there is no gravity to hold the food down their stomachs.95. Y es, I do. Because with gravity we can do many things in comfort rather than in pain such as cry, burp and so so.。
2018-2019年度八年级期中英语测试卷.doc
2018-2019年度八年级期中英语测试卷2018-2019年度八年级期中英语测试卷一、单项选择。
(共15小题,每小题1分,计15分)( )1.james is ________ boy.a. a 18-month-oldb. a 18 months oldc. an 18-month-oldd. an 18-months-old( )2.----- the soccer game was so _____.----- yes, i felt _____ with it.a. bored; boringb. boring; boredc. bored; boredd. boring; boring( )3.please turn on(打开)the tv. i ____ what the weatherwill be like tomorrow.a. wonderb. feedc. knowd. cross( )4.—how often do you drink milk?—i don’t like it, so i _____drink it.a. alwaysb. usuallyc. hardly everd.often( )5. tina is _____ better at physics than tara.a. moreb. muchc. veryd. a lot of( )6. it’s eight o’clock. the students _____ an english class.a. haveb. havingc. is havingd. are having( )7. staying with family and friends is one of________________ things in the world.a. the happiestb. happierc. the happyd. happiest( ).8.china’s got talent is becoming ________________.a. more and more creativeb. creativer and creativerc. more creative and more creatived.most creative and most creative( )9.all these talent shows have one thing________________ common.a. onb. inc. atd. for( )10.the movie is boring.he ___________ it.so he goes home.a.can’t standb.lovesc.doesn’t mindd.likes( )11. —morning, class. is ________________ here?—no, sir. tom is absent(缺席的).a. anybodyb. everybodyc. nobodyd. somebody( )12. his home is _____________ the school, so he walksto school every day.a. close tob. far fromc. close fromd. far to( )13、---what do you want to do when you are in american?---i expect ____________ english well. a、learnb、to learnc、learningd、learned( )14. —don’t you think there are too many cars in ourcity?—i really think so. if there are ________ peopledriving, there will be __ ______ noise. a. less; lessb. fewer; fewerc. less; fewerd. fewer; less( )15. of the three students, one is from london,_________ two are from new york. a. other b.the other c. another d. some other二、完形填空。
华育中学2018八年级英语期中试卷
华育中学 2017-2018 学年第一学期期中试卷八年级英语2017.11(满分 150 分,考试时间 100 分钟)Part 1Listening (第一部分 听力) I. Listening Comprehension 20%A. Listen and choose the right picture 3%1.2. 3. 4. 5. 6. B. Listen to the dialogue and choose the best answer to the question you hear 3.5%7. A) 8. A) Shy A teacher B) B) Pretty A TV host C) C) Serious A bank clerk D) D) ActiveA writer9. A) 2:00 B) 2:15 C) 2:30 D) 2:4510. A) By check B) By cash C) By credit card D) By Apple Pay11. A) A TV guide B) A part-time job C) A plan D) A choice of courses12. A) The shoes are too heavy B) The ground is wetC) She doesn’t like the shoes D) It is raining outside.13. A) Some Chinese were hit by local people. B) An earthquake occurred there last night.C) Some tourists were killed in a flash flood. D) Some tourists were injured in a car accident.14. A) A good website helped Alina get some customers.B) Alina helps people by donating clothes and furniture.C) Alina borrowed money from the bank to start her business.D) A li n a ’s bu s i n e ss i s t o g i v e p e op l e a dv i ce on c r ea ti ng website.C. Listen to the passage and tell whether the following statements are true or false 3.5%15. Barry Haddow travels from Wales to London every day.16. T h e “C o mm u t e r o f t h e Y ea r ” c o m p e titi on w a s o r g a n i z ed by an early morning TV program.17. Mr. Haddow won because his commute takes the longest time.18. He travels most of the way by train, and then by taxi.19. H e do e s n ’t li k e w a l e s , bu t it ’s no t a s e xp e n s i v e a s L ondon .20. He won a rail holiday for himself and his family.D. Listen to the passage and complete the following sentences 10%21. William Baldock is a hero after helping his mother when she .22. He rang for an ambulance, telephoned his father , and then his grandmother.23. While waiting for people to come, William his 18-mongth-old sister.24. Steve Lyn was amazed that William knew the to dial.25. Mrs. Baldock was very both William and the ambulance service,Part 2 Phonetics, Vocabulary and Grammar(第二部分语音、词汇和语法)Ⅱ. Choose the best answer 20%26.Which of the underline parts has the different pronunciation from the others?A) business B) luckily C) assistant D) simple27.Gold is measured in ounces when bought in the international market while diamond is sold by carat.A) a B) / C) the D) an28.Can you see the vase the corner of the table and the cat the corner of the room?A)on…i n B)a t…i n C)on…a t D)i n…a t29.Can you find the answer the question the newspaper?A) of…on B) of…in C) to…on D) to…in30.The car disappeared in a flash after it hit the old lady. The underlined part means .A) immediately B) nearly C) especially D) badly31.the books in the school library will be donated to the Hope Project.A) Nine hundred B) Nine hundreds C) Nine hundred of D) Nine hundreds of secretary Hilary Clinton said recently that she soon to enjoy private life.A) retired B) would retire C) had retired D) will retire33.If a computer crashes, you will lose the file you unless you save it regularly.A) are working B) work C) will work D) worked34.The cause he had devoted himself to a perfect success.A) proving B) proved C) was proved D) has been proved35.Fortunately, we had bought a metro map, we would have lost our way home.A) what B) where C) without which D) that36.He is the only one of the employees well paid in this enterprise.A) which is B) who get C) who are D) that is37, I like the way he talks and laughs. the saying goes, beauty is in the eye of the beholder.A)in w h i c h…A s B)w h i c h…A s C)/…W h i c h D)t h a t…L i k e38.I t w a s a m ee ti ng i m po r t a n ce I d i dn’t r ea li ze at that time.A)why B) which C) where D) whose39.–I find it fun and challenging.- It is a job you are doing something serious but interesting.A)where B) which C) when D) that40.Which of the following sentence is correct?A)I think he shouldn’t give up.B)He has not decided when he would fly to Beijing.C)I asked him when he had arrived.D)Could you tell me which is the way to the hospital?41.The hotel is almost finished, but it needs one or two weeks to get ready for guests.A)only B) also C) still D) even42.It is time for him to these foolish ideas and become serious.A)put away B) put up C) put up with D) put out43.Joint efforts have been made the pressure on water demand.A)relieve B) relieving C) relieved D) to relieve44.I have homework to do today, and some of the English exercises are difficult for me.A)too much …too much B) too much… much tooC)much too…t oo m u c h D)m u c h t oo…much too45.People who live in a small village are bound to see a good of each other.A)sum B) quantity C) deal D) amountCompany Builds World’s First Automobile Vending Machine (自动贩卖机) Thanks to used-car website Carvana, it is now possible to buy your own set of wheels at the touch of a bu tt on,fr o m t h e w o r l d’s f i r s t a nd on l y c o i n-operated car vending machine in Nashville,Tennessee. It’s quick, easy, and not cheap, but cheaper than buying a car the old way.The company has been working on the concept for the past two years. Their original car vending m ac h i n e w a s i n s t a ll e d i n A tl a n t a i n2013.B u t t h e y’v e s p e n t ti m e46the design,in order to take user experience to the next level.“O u r n e w V e nd i ng M ac h i n e i s a s t a t e-of-the-art,multi-story s t r u c t u r e t h a t d e li v e r s ou r c u s t o m e r s’ca r s by m e r e l y inserting a special c o i n,”s a i d C a r v a n a C E O Ernie Garcia.The machine 47 a five-story glass tower that can hold up to 20 cars at a time. The tower basically serves as a pickup point for used cars that customers 48 through the website, 49 competitive pricing and eliminating delivery costs.Customers can 50 a long list of specifications, ratings, reviews, and lots of other details a bou t t h e ca r s t h e y’r e i n t e r e s t e d i n on t h e C a r v a n a w e b s it e.T h e y e v e n get virtual tours that point out every scratch on the body of the car. Once the car is chosen and paid for, the company usually delivers the car to the customer for a seven-day trial period. This usually means the delivery costs are worked into the price of the vehicle.But with the Vending Machine,customers are able to go to p i c k up t h e i r ca r s s t r a i gh t a w a y.I t’s a win-win 51 that allows Carvana to cut down on staff and overhead (间接费用), and save customers about $2,000 52 . According to the company, it also makes for a great buying experience –placing an oversized coin in a slot (硬币投币口) and watching their car roll down automatically.“Caravan’s mission i s to 53 a better way to buy a car, and this new Vending Machine will be a one-of-a-kind experience,mirroring j u s t ho w s i m p l e a nd ea s y w e’v e m a d e it t o buy a ca r on li n e,” Garcia said. He added the company plans to build more car vending machines in the future.Ⅳ. Complete the sentences with the given words in their proper forms 8%54.Is it right to say we count in because we have ten figures? (ten)55.Henry was so excited when receiving the guitar as a gift, for it was his favoritemusical instrument. (electricity)56.He would like to spend as much time as he can ideas with his parents.(change)57.The wonderful performance they put on last night was beyond H o w a r d’s.(expect)58.You should be brave enough to report the you see to the police. (thief)59.In fact, I found some of the students are smart but act . (responsibility)60.Our chemistry teacher told us that we could find either in chemistry lab or in chemical factory. (chemistry)61.You’d better give a full which agrees with the facts of the situation. (explain) V. Rewrite the following sentences as required 14%62.I will finish my homework in one or two hours. (对划线部分提问)will you finish your homework?63.The firemen stopped working when all the workers were saved. (保持句意基本不变)The firemen stop working all the workers were saved.64.The news report is very wonderful.(改为感叹句)wonderful news report it is!65.Now students rarely use abacuses to deal with math problem. (改为反意疑问句)Now students rarely use abacuses to deal with math problem, ?66.Do you know whose house this was in the 20th century? (保持句意基本不变)Do you know this house in the 20th century?67.She asked me if I would go to the cinema the next day. (改为简单句)She asked me go to the cinema the next day.68.you, than, shorter, to, used, she, that, believe, to, hard, is, it, be (连词成句)Translation 10%69.The computers can(在一瞬间精确地给出这道题的答案)70.He has finished (对机器人编程).Now it is(足够聪明来更好地接受人们的指令)han rs use. The company lized ridesharing 71. The father always rides his bike to(地铁站接他的女儿).72. My boss sometimes (与他的客户一边吃午饭一边讨论公事) 73. The police didn ’t because he_(警察没有把他从监狱释放因为他承认违法了) Part 3Reading and WritingA. Choose the best answer 12% (A)Cities are taking interest in electric scooter-share systems as an affordable transportation to cut down on pollution and traffic jams. The electric scooters, which weigh between 30 and 40 pounds, reach speeds of about 15 mph.In September 2017,Santa Monica, California, became the first U.S. city tohave an electric scooter-share service. Users find and unlock one of the more t 1,000 scooters with a smartphone app. A ride costs $ 1,and then 0.15 cents fo each minute of riding throughout the beach town. Bird, the startup operating the scooter-share, picks up the scooters every n i gh t t o t h e m , a nd p l ace s t h e m a r ound S a n t a M on i ca eac h m o r n i ng r ea dy f o r p e op l e ’ was created by Travis VanderZanden, who once worked in Uber and Lyft, after he rea services failed to help with traffic jams and air pollution. Since its September 2017 beginning, B i r d ’s s y s t e m h a s s e r v e d m o r e t h a n 50,000 r i d e r s w ho h a v e t a k e n 250,000 t r i p s — more than half of w h i c h h a v e b ee n i n t h e l a s t m on t h . I t ’s s i n ce e xp a nd e d (扩 张) to Venice, California, and some neighborhoods in Los Angeles and San Diego. Bird plans to expand to lots of markets by the end of 2018.Competitors , backed by millionaires , are appearing. Two bike-share startups Lime Bike and Spin, have spoken of plans to provide electric scooters in cities this year.Electric scooters have also gotten the attention of Mayor Pete Buttigieg from South Bend , Indiana. The city is interested in using them as a way to improve public transportation. South Bend was one of the first to use bike-share systems, which allow people to park ridesharing bikes on public l a nd . “W e l ov e t o b e ea r l y p i on ee r s ,” s a i d B u tti g i e g . “I f w e w o r k ou t t h e s a f e t y p r ob l e m , w e w ould b e op e n t o w e l c o m i ng t h e t ec hno l ogy .”“W e n ee d t o m a k e s u r e t h e s e n e w t r a n s po r t a ti on s y s t e m s a r e l a w f u l a nd s a f e f o r u s e r s ,”Constance Farrell ,a s pok e s w o m a n f o r t h e c it y o f S a n t a M on i ca t o l d C NN . “W e w ou l d li k e t o s ee e l ec t r i c scooters continue to operate in the city. They a r e i n li n e w i t h our goal of multi-modal living and carbon-li gh t li v i ng . ” A cc o r d i ng t o F a rr e ll ,there have been eight accidents, including one with a serious head injury , in Santa Monica after the scooters rolled out. Users are required to have a d r i v e r ’s li ce n s e (驾 照),should not ride on sidewalks or have other passengers on board.Bird has given out free helmets to some riders and tells its users to ride in bike lanes, but s o m e u s e r s r i d e on s i d e w a l k s , a nd m o s t U .S . s t r ee t s don ’t h a v e bike lanes.“T h e g l ob a l c o mm un it y o f c iti e s i s go i ng t o h a v e t o w o r k t h i s a ll ou t f o r s c oo t e r s ,”B u tti g i e g s a i d . “T h e y ca n m ov e unb e li e v a b l y qu i c k l y . T h a t ’s e x c iti ng ,a nd a littl e d a ng e r ou s . ”74. Why did Travis create Bird Company?A. Because he received support from millionaires and the government.B. Because many cities had electric scooter-share services.C. Because it is lawful and safe to use electric scooters.D. Because cities need better ridesharing services.75. T h e w o r d s “are i n li n e w i t h ” i n Paragraph 6 p r ob a b l y m ea n “ ”.A. stopB. meet the need ofC. changeD. are ahead of76. What can we learn from the passage?A. Future electric scooters will be very slow and sale.B. Electric scooters will cause fewer accidents than cars.C. More cities will try to help with electric scooters service.D. Future traffic problems will be solved with help of electric scooters.(B)Diet Coke, diet Pepsi, diet pills, no-fat diet, vegetable diet…We are surrounded by the word “diet”everywhere we look and listen. We have so easily been attracted by the promise and potential of diet products that we have stopped thinking about what diet products are doing to us. We are paying for products that harm us psychologically and physically.Diet products weaken us psychologically. On one level, we are not allowing our brain to admit that our weight problems lie not in actually losing the weight, but in controlling the consumption of fatty, high-calorie, unhealthy foods. Diet products allow us to jump over the thinking stage and go straight for the counter instead. All we have to do is to swallow or recognize the word “diet” in food brands.On another level, diet products have greater psychological effects. Every time we have a zero-calorie drink, we are telling ourselves without our awareness that we don’t have to work to get results. Diet products make people believe that gain comes without pain, and that life can be without resistance and struggle.The danger of diet products lies not only in the psychological effects they have on us, but also in the physical harm that they cause. Diet foods can indirectly harm our bodies because consuming them instead of healthy foods means we are preventing our bodies from having basic nutrients(营养成分). Diet foods and diet pills contain zero calorie only because the diet industry has created chemicals to produce these wonder products. Diet products may not be nutritional, and the chemical that go into diet products are potentially dangerous.Now that we are aware of the effects that diet products have on us, it is time to seriously think about buying them. Losing weight lies in the power of minds, not in the power of chemicals. Once we realize this, we will be much better able to resist diet products, and therefore prevent the psychological harm that comes from using them.77.From Paragraph 1, we can learn thatA.diet products can bring out people’s potentialB.people have difficulty in choosing diet productsC.diet products are misleading peopleD.people are fed up with diet products78.The purpose of writing this passage is .A.to warn people of the side effect of diet productsB.tell people how to lose weightC.to advise people to eat diet productsD.to introduce some diet products79.Which of the following shows the structure(结构)of the passage?CP: Central Point P: Point SP: Sub-point(次要点) C: ConclusionB.Choose the words or expressions and complete the passage 12%When we think of green buildings, we tend to think of new ones --- the kind of modern, solar-paneled masterpieces that make the covers of architecture magazines.But the US has more than 100 million existing homes, and it would be incredibly wasteful to tear them all down and replace them with greener versions.An enormous amount of energy and resources went into the construction of those houses.And it would take an average of 65 years for the 80 carbon emissions (排放) from a new energy-efficient ( 节能) home to make up for the 81 lost by destroying an old one.So in the broadest sense, the greenest home is the one that has already been built.But at the same time, nearly half of US carbon emissions come from heating, cooling and powering our homes, offices and other buildings."You can't deal with climate 82 without dealing with existing buildings,"says Richard Moe, the president of the National Trust.With some exceptions, the oldest homes tend to be the least energy-efficient.Houses built before 1939 use about 50more energy per square foot than those built after 2000, mainly due to the tiny cracks and gaps that expand over time and let in more outside air.83 , there are a vast number of relatively simple changes that can green older homes, from 84 ones like Lincoln's Cottage to your own postwar home.And efficiency upgrades (升级) can save more than just the earth; they can help protect property owners from rising power 85 .80. A. reduced B. increased C. used D. destroyed81. A. magazines B. trees C. materials D. resources82. A. improvement B. appearance C. stability D. change83. A. Oppositely B. Unfortunately C. Fortunately D. Frankly84. A. historic B. worthless C. ordinary D. meaningless85. A. prices B. costs C. businesses D. bargainsC.Read the passage and fill in the blanks with proper words 16%H a ili ng fr o m S w e d e n,“p l ogg i ng”i s a f it n e ss c r aze t h a t s ee s p a r ti c i p a n t s p i c k up p l a s ti c litt e r while jogging—adding a virtuous, environmentally driven element to the sport. Plogging appears to have started around 2016, but is now going (86)a , due to increasing awareness and fear over plastic levels in the ocean.The appeal of plogging is its simplicity —all you need is running gear and a bin bag, and the feeling of getting fit while supporting a good cause. By adding regular squats (蹲) to pick up junk and carrying (87)w to jogging, we can assume the health benefits are increased.Running and good causes have always gone hand in hand —just think of all the fundraising marathon r unn e r s do.B u t t h e r e c ou l dn’t b e a m o r e on-trend way of keeping fit than plogging.A ny t h i ng t h a t’s g e tti ng p e op l e ou t i n n a t u r e a nd c onn ec ti ng po s iti v e l y w it h t h e i r e nv i r on m e n t is a good thing, says Lizzie Carr, an environmentalist who helped set up Plastic Patrol, a nationwide campaign to rid ou r i n l a nd w a t e r w a y s o f p l a s ti c po ll u ti on.“T h e r e’s b ee n a r ea l shift in the public mindset around plastics, helped by things like Blue Planet highlighting how disastrous the crisis i s,”s h e s a y s.We need to keep momentum high and the pressure up, and empower people through initiatives like plogging and Plastic Patrol.The Plastic Patrol app (88)a users to map plastic anywhere in the world by collecting discarded items, photographing them and uploading to the app, giving us a better knowledge of what s o r t s o f p l a s ti c a nd w h i c h b r a nd s a r e b e i ng t h r o w n ou t.“I’d u r g e a ll p l ogg e r s t o g e t i nvo l v e d,”adds Carr.P l ogg i ng i s n’t t h e f i r s t f it n e ss t r e nd t o c o m b i n e r unn i ng w i th a good cause.Here are some of our (89)f :Good GymIts idea is (90)s : go for a run, visit an elderly person, have a chat and some tea, and run back.(91)L among the elderly is a growing problem in the UK. With over 10,000 runs so far, however, Good Gym is finding a solution.Guide RunningGuide runners (92)v their time to helping blind people get active. By linking themselves together, the visually impaired individual can feel (93)s while both work up a sweat.Cycling for the HomelessStart-up Stuart Delivery and the Church Housing Trust collaborated last year in bringing clothing and healthy food to the homeless. Deliveries are mostly made by bike, so those who deliver keep fit while helping rough sleepers.D.Answer the questions 10%Everybody likes to laugh sometimes,whether at a funny joke,an a m u s i n g incident or a h il a r i o u s(非常滑稽的)photograph or edians who p a r od y(滑稽地模仿)well known people always t i c k l e m y funny bone!(令人发笑)The great thing is that once we've had a good laugh, we feel happier.It would seem therefore, that bringing a bit of humor into more serious situations might be good for us.Places like a hu m o r l e ss office or a tense classroom could sometimes do with a good dose of laughter.I know that in my workplace;a bit of h il a r i t y(欢乐,欢闹)can go a long way towards making it a more enjoyable place to spend eight or so hours a day.Seeing t h e f unn y s i d e of things can certainly li f t o u r s p i r i t s and that in turn can make us feel better about what we're doing.Maybe we should get i n s p i r a t i o n(灵感)from Steve Carlisle,president of General Motors of Canada. When he walks around the firm's Ontario headquarters he shares his s e n s e o f hu m o r to bond(亲近,团结)with his staff. He says "It can help people feel more relaxed, more comfortable and thus be more effective at what they do." Humour can be used by teachers in the classroom too. It's a good way to b r e ak t h e i c e(打破沉默)with students and create a more relaxed atmosphere which is good for learning,as long as everyone doesn't spend all their time in h y s t e r i c s!(狂笑)But we have to be careful; not everyone laughs at the same things. While some of us may admire a work colleague or fellow student for their clever and well-told joke, others may consider them s a r c a s t i c,(讽刺的,挖苦的)o ff e n s i v e(讨厌的)or just an idiot!According to Professor Schweitzer, from the University of Philadelphia's Wharton School, a worker or boss who successfully uses humor is seen as both confident and c o m p e t e n t(有能力的),which in turn increases his or her status? He says "Being funny is taking a risk, and being risky shows confidence." His study 'Risky Business: When Humour Increases and Decreases Status' also found that someone who tells i n a pp r op r i a t e(不合适的)jokes is also seen as confident but they're also regarded as incompetent.So telling the right jokes in the office or classroom can spread some happiness but if you still think working and studying is n o l a u g h i n g m a tt e r(严肃的事情),take note of a study published in The Journal of Behavioral and Applied Management in 2006, that found for healthcare workers, emotional exhaustion was significantly lower among those who experienced greater levels of fun at work. And other research has discovered that teams who share more jokes gave more s u ppo r t i v e andc o n s t r u c t i v e statements to each other–and that's no joke!94.How does Steve Carlisle, president of General Motors of Canada, try to get along with his employees?95.According to Professor Schweitzer, from the University of Philadelphia's Wharton School, how doesa worker have to use humor if he or she is to appear confident and competent?96.True or false: A study found health workers got greater levels of emotional exhaustion when they had fun at work.97.Which word used in the article means ' respect and approve of someone or their behavior'?98.How competent is someone seen as when they tell inappropriate jokes?VII. Writing 20%99.Wr i t i n g a p a ss a g e w i t h a t l e a s t100 w o r d s o n t h e t op i c“T h e M o s t D i ff i c u l t M o m e n t i n M y L i f e”.生活中困难在所难免,每个人或多或少都经历过一些困难的时刻。
【初二下数学】2019华育八下期中卷
2018学年第二学期期中考试 初二数学 试卷 2019.4.17(考试时间:90分钟 满分:100分)一、填空题(每空2分,共28分) 1.已知416x =,则x =_________2.下列关于x 的方程:(11=;(2)417x =-;(3)2(1)21a xx x +-=-;(4)8(0)x a a=≠;其中是整式方程的有__________ 3.方程23212x x x x -=-+-的根为__________ 4.如图所示,在梯形ABCD 中,AD BC ∥,对角线AC BD ⊥,且10AC =,5BD =,则这个梯形中位线的长等于__________5.关于x 、y 的方程组22211010x y x y x -=⎧⎨--+=⎩的解为___________ 6.某超市用2500元购进一批水果,销售过程中损耗水果10千克.已知超市每千克水果的售价比进价多1元,全部售完共赚440元,则这批水果每千克的进价为__________元 7.关于x 、y 的方程组2120x y x y m +=⎧⎨+-=⎩有两组相等的实数根,则m =__________8.定义一种新的运算*,使*()a b ab a b =+,则方程(*2)*2160x =的实数根为_________ 9.关于x1k =-无实根,则k 的取值范围为__________10.已知ABC ∆的周长为2,联结ABC ∆三边中点构成第二个三角形,再联结第二个三角形的三边中点构成第三个三角形,以此类推,第2020个三角形的周长是__________ 11.已知4322914920x x x x -+-+=,则1x x+=________ 12.在ABC ∆中,60A ∠=︒,AB =BC =AB 、CB 的中点D 、E ,则线段DE =__________ 13.关于x 的方程2(1)22563x k x x x x x --=--+-有增根,则k =__________ 14.已知实数0a >,0b >,满足2019a +=,22019b b +=,则a b +的值是_________第4题图二、选择题(每题3分,共12分)15.如图所示,已知四边形ABCD ,R ,P 分别是DC ,BC 上的点,E ,F 分别是AP ,RP 的中点,当点P 在BC 上从点B 向点C 移动而点R 不动时,那么下列结论成立的是( )A 、线段EF 的长逐渐增大B 、线段EF 的长逐渐减少C 、线段EF 的长不变D 、线段EF 的长不能确定16.为响应“传统文化进校园”的号召,我校举行了书法比赛,为鼓励获奖同学,学校购买了一些钢笔和毛笔,钢笔单价是毛笔单价的1.5倍,购买钢笔用了1200元,购买毛笔用率1500元,购买的钢笔支数比毛笔少20支,钢笔,毛笔的单价分别是多少元?如果设毛笔的单价为x 元/支,那么下面所列方程正确的是( )A 、12001500201.5x x -= B 、150********.5x x -= C 、1500120020 1.5x x =-D 、12001500201.5x x-= 17.下列无理方程有解的有( )(110=;(2(3(4x =-; (51x =;A 、1个B 、2个C 、3个D 、4个18.下列说法正确的是( )(1)二项方程的解的个数为1或2;(2)两个不同的二元二次方程一定可以组成一个二元二次方程组; (32=是分式方程; (4)2224x y x y +=⎧⎨+=⎩的实数解有两组; (5)关于x 的方程420ax bx c ++=,当0ab <,0ac >时,方程一定有4个实数根.A 、0个B 、1个C 、2个D 、3个三、解方程(组)(每题5分,共25分)第15题图19. 2222125+044348314x x x x x x --=---+-20. 22314612x y x y x y x y ⎧+=⎪++⎪⎨⎪-=⎪++⎩21. 1x +22. 222221833322760x xy y x xy y ⎧-+=⎪⎨++=⎪⎩23.解关于x 的方程:22()2n n a x b b a b x -=--(n 为正整数,0b ≠)四、列方程(组)解应用题(8分)24.华育中学为了迎接20周年校庆,决定对学校进行整修,于是与沪上某知名建筑公司商谈该工程项目.(1)因为要在教学楼的教室内安装空调,所以需要对现有的电路进行重新铺设.预计需要重新铺设6240米的电线,由于采用了新的铺设方法,现计划每天铺设的长度比原计划增加156米,因而可以比原计划提前两天完成,求现计划每天铺设多少米的电线.(2)据建筑公司预测,整个工程需要35天完成;如果每个工人每天多工作2小时,则工期可以缩短5天;如果增加6名工人,每人每天再多工作1小时,则工期可以再缩短十天.请计算原来施工的工人有多少名?每人每天工作多少小时?五、解答题(25题6分,26题6分,27题6分,共18分)25.如图,在梯形ABCD 中,CD AB ∥,点F 在AB 上,DF AF =,且DE AD ⊥交BC 于点E ,联结EF ,EF DE ⊥.(1)如果13DF =,12DE =,求AD 的长(2)若E 为CB 的中点,求证:AF DC BF =+26.已知关于x 、y 的方程组2242y x k y k x k +=⎧⎨=+-+⎩有两组不同的实数解11x x y y =⎧⎨=⎩,22x x y y =⎧⎨=⎩,且120x x +≠,(1)求k 的取值范围;(2)如果1x 、2x 为等腰三角形的两边,试求k 的取值范围.27.关于x(21)1kx k x =++有且只有一个实数根,求k 的取值范围.六、综合题(9分)28.如图1,函数(0,0)ky k x x=>>的图像于矩形OABC 的边AB 交于点E ,点A 在x 轴的正半轴,点C 在y 轴的正半轴,点B 的坐标是1(4,10)4m +,其中0m >,点D 在线段CO 上,4CD =,设点P 在该函数图像上,且它的横坐标为m .(1)当16k =时,则BE =_______(用含m 的代数式表示);(2)如图2,在(1)的条件下,若BDE ∆恰好是以BD 为腰的等腰三角形,求m 的值; (3)取PD 中点为G ,是否存在点P ,使得以PD 为斜边的直角三角形的直角顶点F 落在矩形OABC 的一边上(除边OC 外),且同时满足GF 垂直于这条边,30FDP ∠=度.若存在,直接写出k 的值;若不存在,请说明理由.x图1备用图x图2。
上海民办华育中学初中数学八年级下期中经典练习卷(专题培优)
一、选择题1.(0分)[ID :9928]按图(1)﹣(3)的方式摆放餐桌和椅子,照这样的方式维续摆放,如果摆放的餐桌为x 张,摆放的椅子为y 把,则y 与x 之间的关系式为( )A .y =6xB .y =4x ﹣2C .y =5x ﹣1D .y =4x+22.(0分)[ID :9927]如图,四边形ABCD 是长方形,AB=3,AD=4.已知A (﹣32,﹣1),则点C 的坐标是( )A .(﹣3,32)B .(32,﹣3)C .(3,32)D .(32,3) 3.(0分)[ID :9903]已知四边形ABCD 是平行四边形,下列结论中不正确的是( ) A .当AB BC =时,它是菱形B .当AC BD ⊥时,它是菱形 C .当90ABC ︒∠=时,它是矩形 D .当AC BD =时,它是正方形4.(0分)[ID :9900]如图,在菱形ABCD 中,AB =6,∠ABC =60°,M 为AD 中点,P 为对角线BD 上一动点,连接PA 和PM ,则PA +PM 的最小值是( )A .3B .2√3C .3√3D .6 5.(0分)[ID :9879]如图,一个梯子AB 斜靠在一竖直的墙AO 上,测得4AO =米.若梯子的顶端沿墙下滑1米,这时梯子的底端也恰好外移1米,则梯子AB 的长度为 ( )A .5米B .6米C .3米D .7米6.(0分)[ID :9877]周末小丽从家里出发骑单车去公园,因为她家与公园之间是一条笔直的自行车道,所以小丽骑得特别放松.途中,她在路边的便利店挑选一瓶矿泉水,耽误了一段时间后继续骑行,愉快地到了公园.图中描述了小丽路上的情景,下列说法中错误的是( )A .小丽从家到达公园共用时间20分钟B .公园离小丽家的距离为2000米C .小丽在便利店时间为15分钟D .便利店离小丽家的距离为1000米 7.(0分)[ID :9870]函数y =11x x +-中,自变量x 的取值范围是( ) A .x >-1 B .x >-1且x ≠1C .x ≥一1D .x ≥-1且x ≠1 8.(0分)[ID :9864]如图,在Rt ABC ∆中,90ACB ∠=︒,CD ,CE 分别是斜边上的高和中线,30B ∠=︒,4CE =,则CD 的长为( )A .25B .4C .23D .59.(0分)[ID :9922]《九章算术》勾股章有一问题,其意思是:现有一竖立着的木柱,在木柱上端系有绳索,绳索从木柱上端顺木柱下垂后,堆在地面的部分尚有3尺,牵着绳索退行,在离木柱根部8尺处时绳索用尽,请问绳索有多长?若设绳索长度为x 尺,根据题意,可列方程为 ( )A .82﹢x 2 = (x ﹣3)2B .82﹢(x +3)2= x 2C .82﹢(x ﹣3)2= x 2D .x 2﹢(x ﹣3)2= 82 10.(0分)[ID :9837]如图,矩形ABCD 中,DE ⊥AC 于E ,且∠ADE :∠EDC=3:2,则∠BDE 的度数为( )A .36°B .18°C .27°D .9°11.(0分)[ID :9834]下列运算正确的是( )A 532=B 822=C.114293=D.()22525-=-12.(0分)[ID:9833]下列各式中一定是二次根式的是( )A.23-B.2(0.3)-C.2-D.x13.(0分)[ID:9885]如图,ABC中,CD AB⊥于,D E是AC的中点.若6,5,AD DE==则CD的长等于()A.5B.6C.8D.1014.(0分)[ID:9869]如图,菱形ABCD的对角线AC,BD相交于点O,E,F分别是AB,BC边上的中点,连接EF.若3EF=,BD=4,则菱形ABCD的周长为()A.4B.46C.47D.2815.(0分)[ID:9851]下列各组数据中,不可以构成直角三角形的是()A.7,24,25B.2223,4,5C.53,1,44D.1.5,2,2.5二、填空题16.(0分)[ID:10030]如图,已知在Rt△ABC中,AB=AC=3√2,在△ABC内作第1个内接正方形DEFG;然后取GF的中点P,连接PD、PE,在△PDE内作第2个内接正方形HIKJ;再取线段KJ的中点Q,在△QHI内作第3个内接正方形…,依次进行下去,则第2019个内接正方形的边长为_____.17.(0分)[ID:10021]比较大小:21318.(0分)[ID:10001]如图,□ABCD的周长为16cm,AC、BD相交于点O,OE⊥AC交AD 于E ,则△DCE 的周长为________19.(0分)[ID :9993]在函数y=1x x -中,自变量x 的取值范围是_____. 20.(0分)[ID :9990]如图所示的网格是正方形网格,则BAC DAE ∠-∠=__________︒(点A ,B ,C ,D ,E 是网格线交点).21.(0分)[ID :9982]将函数31yx 的图象平移,使它经过点()1,1,则平移后的函数表达式是____. 22.(0分)[ID :9975]把两个同样大小的含45°角的三角尺按如图所示的方式放置,其中一个三角尺的锐角顶点与另一个的直角顶点重合于点A ,且另三个锐角顶点B ,C ,D 在同一直线上.若AB=2,则CD=_____.23.(0分)[ID :9942]放学后,小刚和同学边聊边往家走,突然想起今天是妈妈的生日,赶紧加快速度,跑步回家.小刚离家的距离()s m 和放学后的时间之间()t min 的关系如图所示,给出下列结论:①小刚边走边聊阶段的行走速度是125/m min ;②小刚家离学校的距离是1000m ;③小刚回到家时已放学10min ;④小刚从学校回到家的平均速度是100/m min .其中正确的是_____(把你认为正确答案的序号都填上)24.(0分)[ID :9941]已知矩形ABCD 如图,AB =4,BC =3P 是矩形内一点,则ABP CDP S S ∆∆+=______________.25.(0分)[ID :9937]如图,若▱ABCD 的周长为22 cm ,AC ,BD 相交于点O ,△AOD 的周长比△AOB 的周长小3 cm ,则AB =________。
【三套打包】上海华育中学八年级下学期期中数学试题
人教版八年级数学下册期中考试试题及答案一、选择题(本大题共12小题,共36.0分)1.下列各式是二次根式的是()A. √−7B. √mC. √m2+1D. √332.若√m−3在实数范围内有意义,则x的取值范围是()A. m<3B. m≤3C. m>3D. m≥33.下列计算错误的是()A. 3√2−√2=3B. √60÷√5=2√3C. √25m+√9m=8√mD. √14×√7=7√24.估计√19的值是在()A. 3和4之间B. 4和5之间C. 5和6之间D. 6和7之间5.已知△ABC的三边长分别为a,b,c,且满足(a-5)2+|b-12|+√m−13=0,则△ABC()A. 不是直角三角形B. 是以a为斜边的直角三角形C. 是以b为斜边的直角三角形D. 是以c为斜边的直角三角形6.能判定四边形ABCD为平行四边形的条件是()A. mm//mm,mm=mmB. ∠m=∠m,∠m=∠mC. mm//mm,∠m=∠mD. mm=mm,mm=mm7.如图,点P是平面坐标系中一点,则点P到原点的距离是()A. 3B. √2C. √7D. √538.如图,四边形ABCD中,AB=4cm,BC=3cm,CD=12cm,DA=13cm,且∠ABC=90°,则四边形ABCD的面积为()A. 6mm2B. 30mm2C. 24mm2D. 36mm29.如图,在边长为2的正方形ABCD中,M为边AD的中点,延长MD至点E,使ME=MC,以DE为边作正方形DEFG,点G在边CD上,则DG的长为()A. √3−1B. 3−√5C. √5+1D. √5−110.如图,已知四边形ABCD是平行四边形,下列结论中不正确的是()A. 当mm=mm时,它是菱形B. 当mm⊥mm时,它是菱形C. 当∠mmm=90∘时,它是矩形D. 当mm=mm时,它是正方形11.已知菱形ABCD中,对角线AC与BD交于点O,∠BAD=120°,AC=4,则该菱形的面积是()A. 16√3B. 16C. 8√3D. 812.如图,四边形ABCD中,AB=BC,∠ABC=∠CDA=90°,BE⊥AD于点E,且四边形ABCD的面积为8,则BE=()A. 2B. 3C. 2√2D. 2√3二、填空题(本大题共6小题,共18.0分)13.计算(√5+√3)(√5-√3)的结果等于______.14.直角三角形的两边长分别为3cm、4cm,则第三边的长为______.15.在平面直角坐标系中,点A,B,C的坐标分别是A(-2,5),B(-3,-1),C(1,-1),在平面直角坐标系内找一点D,使四边形ABCD是平行四边形,那么点D的坐标是______.16.如图,一根树在离地面9米处断裂,树的顶部落在离底部12米处.树折断之前有______米.17.实数a、b在数轴上的位置如图所示,则√(m+m)2+√m2的化简结果为______.18.请你求出√1+m2+√4+(4−m)2的最小值为______.三、计算题(本大题共2小题,共20.0分)19.计算下列各题(1)12√12•(3√13+√2)(2)√123÷√213×√125(3)√48−√54÷√2+(3-√3)(1+√3)(4)(3+√7)(3-√7)-(1-√2)2.20.先化简,再求值:m2−2mm+m22m−2m ÷(1m-1m),其中a=√5+1,b=√5-1.四、解答题(本大题共3小题,共26.0分)21.如图,▱ABCD中,点E,F在对角线BD上,且BE=DF,求证:(1)AE=CF;(2)四边形AECF是平行四边形.22.如图,在平面直角坐标系中,长方形纸片的AB边在y轴上,BC边在x轴上,B与坐标原点重合,折叠长方形ABCD的一边AD,使点D落在BC边的F处,折痕为AE,已知A点坐标为(0,8),C点坐标为(10,0).求:E点坐标.23.如图,△ABC中,点O为AC边上的一个动点,过点O作直线MN∥BC,设MN交∠ACB的外角平分线CF于点F,交∠ACB内角平分线CE于E.(1)求证:OE=OF;(2)当点O运动到何处时,四边形AECF是矩形,并证明你的结论;(3)在(2)的条件下,试猜想当△ABC满足什么条件时使四边形AECF是正方形,请直接写出你的结论.答案和解析1.【答案】C【解析】解:A、-7<0,不是二次根式;B、当m<0时,不是二次根式;C、a2+1>0,是二次根式;D、根指数是3,不是二次根式.故选C.根据二次根式的概念,逐一判断.主要考查了二次根式的概念.二次根式的概念:式子(a≥0)叫二次根式.(a≥0)是一个非负数.2.【答案】D【解析】解:根据题意得,x-3≥0,解得x≥3.故选:D.根据被开方数大于等于0列式计算即可得解.本题考查的知识点为:二次根式的被开方数是非负数.3.【答案】A【解析】【分析】本题考查了二次根式的混合运算:先把二次根式化为最简二次根式,然后进行二次根式的乘除运算,再合并即可.在二次根式的混合运算中,如能结合题目特点,灵活运用二次根式的性质,选择恰当的解题途径,往往能事半功倍.根据二次根式的加减法对A、C进行判断;根据二次根式的除法法则对C进行判断;根据二次根式的乘法法则对D进行判断.【解答】解:A.原式=2,所以A选项的计算错误;B.原式==2,所以B选项的计算正确;C.原式=5+3=8,所以C选项的计算正确;D.原式==7,所以D选项的计算正确.故选A.4.【答案】B【解析】解:∵<,∴4<<5.故选B.找出比较接近的有理数,即与,从而确定它的取值范围.此题主要考查了估计无理数大小的方法,找出最接近的有理数,再进行比较是解决问题的关键.5.【答案】D【解析】解:∵(a-5)2+|b-12|+=0,∴a=5,b=12,c=13,∵52+122=132,∴△ABC是以c为斜边的直角三角形.故选:D.直接利用绝对值以及偶次方的性质再结合二次根式的性质得出a,b,c的值,进而得出答案.此题主要考查了绝对值以及偶次方的性质再结合二次根式的性质、勾股定理的逆定理等知识,正确得出a,b,c的值是解题关键.6.【答案】C【解析】解:根据平行四边形的判定可知:A、若AB∥CD,AD=BC,则可以判定四边形是梯形,故A错误,B、两组邻角相等也有可能是等腰梯形,故B错误.C、可判定是平行四边形的条件,故C正确.D、此条件下无法判定四边形的形状,还可能是等腰梯形,故D错误.故选C.根据已知条件结合平行四边形的性质直接作出判断即可.本题主要考查平行四边形的判定的知识点,解答本题的关键是熟练掌握平行四边形的判定定理,此题基础题,比较简单.7.【答案】A【解析】解:连接PO,∵点P的坐标是(,),∴点P到原点的距离==3.故选A.连接PO,在直角坐标系中,根据点P的坐标是(,),可知P的横坐标为,纵坐标为,然后利用勾股定理即可求解.此题主要考查学生对勾股定理、坐标与图形性质的理解和掌握,解答此题的关键是明确点P的横坐标为,纵坐标为.8.【答案】C【解析】解:连接AC,∵∠ABC=90°,AB=4cm,BC=3cm,∴AC=5cm,∵CD=12cm,DA=13cm,AC2+CD2=52+122=169=132=DA2,∴△ADC为直角三角形,∴S四边形ABCD=S△ACD-S△ABC=AC×CD-AB×BC=×5×12-×4×3=30-6=24(cm2).故四边形ABCD的面积为24cm2.故选:C.连接AC,在Rt△ADC中,已知AB,BC的长,运用勾股定理可求出AC的长,在△ADC中,已知三边长,运用勾股定理逆定理,可得此三角形为直角三角形,故四边形ABCD的面积为Rt△ACD与Rt△ABC的面积之差.本题考查的是勾股定理的逆定理及三角形的面积公式,根据题意作出辅助线,判断出△ACD的形状是解答此题的关键.9.【答案】D【解析】解:∵正方形ABCD的边长为2,M为边AD的中点,∴DM=1,MC==,∵ME=MC,∴ME=,∴DE=-1,∵以DE为边作正方形DEFG,点G在边CD上,∴DG=-1.故选:D.根据线段中点的定义求出MD,再利用勾股定理列式求出MC,即为ME的长度,然后求出DE,再根据正方形的四条边都相等可得DG=DE.本题考查了正方形的性质,勾股定理的应用,线段中点的定义,熟记性质是解题的关键.10.【答案】D【解析】解:A、根据邻边相等的平行四边形是菱形可知:四边形ABCD是平行四边形,当AB=BC时,它是菱形,故A选项正确;B、∵四边形ABCD是平行四边形,∴BO=OD,∵AC⊥BD,∴AB2=BO2+AO2,AD2=DO2+AO2,∴AB=AD,∴四边形ABCD是菱形,故B选项正确;C、有一个角是直角的平行四边形是矩形,故C选项正确;D、根据对角线相等的平行四边形是矩形可知当AC=BD时,它是矩形,不是正方形,故D选项错误;综上所述,符合题意是D选项;故选:D.根据邻边相等的平行四边形是菱形;根据所给条件可以证出邻边相等;根据有一个角是直角的平行四边形是矩形;根据对角线相等的平行四边形是矩形.此题主要考查学生对正方形的判定、平行四边形的性质、菱形的判定和矩形的判定的理解和掌握,此题涉及到的知识点较多,学生答题时容易出错.11.【答案】C【解析】【分析】此题考查了菱形的性质,直角三角形的性质.解题的关键是注意数形结合与方程思想的应用,注意菱形的面积等于其对角线积的一半.首先由四边形ABCD是菱形,求得AC⊥BD,OA=AC,∠BAC=∠BAD,然后在直角三角形AOB中,利用30°角所对的直角边等于斜边的一半与勾股定理即可求得OB的长,然后由菱形的面积等于其对角线积的一半,即可求得该菱形的面积.【解答】解:∵四边形ABCD是菱形,∴AC⊥BD,OA=OC=AC=×4=2,∠BAC=∠BAD=×120°=60°,∴AC=4,∠AOB=90°,∴∠ABO=30°,∴AB=2OA=4,OB=2,∴BD=2OB=4,∴该菱形的面积是:AC•BD=×4×4=8.故选C.12.【答案】C【解析】解:过B点作BF⊥CD,与DC的延长线交于F点,则有△BCF≌△BAE(ASA),则BE=BF,S四边形ABCD=S正方形BEDF=8,∴BE==.故选C.运用割补法把原四边形转化为正方形,求出BE的长.本题运用割补法把原四边形转化为正方形,其面积保持不变,所求BE就是正方形的边长了;也可以看作将三角形ABE绕B点逆时针旋转90°后的图形.13.【答案】2【解析】解:原式=()2-()2=5-3=2,故答案为:2.先套用平方差公式,再根据二次根式的性质计算可得.本题考查了二次根式的混合运算的应用,熟练掌握平方差公式与二次根式的性质是关键.14.【答案】5mm或√7mm【解析】解:(1)当两边均为直角边时,由勾股定理得,第三边为5cm;(2)当4为斜边时,由勾股定理得,第三边为cm;故直角三角形的第三边应该为5cm或cm.故答案为:5cm或cm.题中没有指明哪个是直角边哪个是斜边,故应该分情况进行分析.此题主要考查学生对勾股定理的运用,注意分情况进行分析.15.【答案】(2,5)【解析】解:由平行四边形的性质,可知D点的纵坐标一定是5;又由C点相对于B点横坐标移动了1-(-3)=4,故可得点D横坐标为-2+4=2,即顶点D的坐标(2,5).故答案为:(2,5).运用平行四边形性质,可知AD∥BC,所以点D的纵坐标是5,再跟BC间的距离即可推导出点D的纵坐标.本题主要是对平行四边形的性质与点的坐标的表示等知识的直接考查,同时考查了数形结合思想,题目的条件既有数又有形,解决问题的方法也要既依托数也依托形,体现了数形的紧密结合,但本题对学生能力的要求并不高.16.【答案】24【解析】解:因为AB=9米,AC=12米,根据勾股定理得BC==15米,于是折断前树的高度是15+9=24米.故答案为:24.根据勾股定理,计算树的折断部分是15米,则折断前树的高度是15+9=24米.本题考查了勾股定理的应用,熟练运用勾股定理进行计算,是基础知识,比较简单.17.【答案】-b【解析】解:结合实数a、b在数轴上的位置,可判断出a>0,a+b<0,则有:+=|a+b|+|a|=-(a+b)+a=-a-b+a=-b.故答案为:-b.结合实数a、b在数轴上的位置,可判断出a>0,a+b<0,让后将+化简求解即可.本题考查了二次根式性质与化简,解答本题的关键在于结合实数a、b在数轴上的位置判断出a>0,a+b<0.18.【答案】5【解析】解:∵求+的最小值,也就是求+的最小值,如图,建立平面直角坐标系,点P(0,x)是y轴上一点,∴可以看成点P与点A(1,0)的距离,可以看成点P与点B(2,4)的距离,∴原代数式的值可以看成线段PA与PB长度之和,它的最小值就是PA+PB的最小值.设点A关于x轴的对称点为A′,则PA=PA′,∵求PA+PB的最小值,只需求PA′+PB的最小值,而点A′、B间的直线段距离最短,∴PA′+PB的最小值为线段A′B的长度,作BC⊥x轴于点C,则BC=4、A′C=3,∴A′B=5,即PA+PB的最小值为5,故答案为:5.求+的最小值,也就是求+的最小值,如图,建立平面直角坐标系,点P(0,x)是y轴上一点,则原式可以看成点P到点A(1,0)和点B(2,4)的长度之和,即PA+PB的最小值,利用轴对称解答即可.本题考查了轴对称-最短距离问题、勾股定理,将代数问题转化为几何问题,正确的画出图形是解题的关键.19.【答案】解:(1)原式=12×3×√12×13+12×√12×2=3+√6;(2)原式=√53×37×75=1;(3)原式=4√3-√54÷2+√3(√3-1)×√3+√3 =4√3-3√3+3-1=√3+2;(4)原式=9-7-(1-2√2+2)=2√2-1.【解析】(1)根据二次根式的乘除法则运算;(2)根据二次根式的乘除法则运算;(3)先把(3-)提,再利用平方差公式计算,然后进行二次根式的除法法则运算后合并即可;(4)利用平方差公式和完全平方公式计算.本题考查了二次根式的混合运算:先把二次根式化为最简二次根式,然后进行二次根式的乘除运算,再合并即可.在二次根式的混合运算中,如能结合题目特点,灵活运用二次根式的性质,选择恰当的解题途径,往往能事半功倍.20.【答案】解:原式=(m −m )22(m −m )•mm m −m =mm 2,当a =√5+1,b =√5-1时,原式=2.【解析】原式括号中两项通分并利用同分母分式的减法法则计算,同时利用除法法则变形,约分得到最简结果,把a 与b 的值代入计算即可求出值.此题考查了分式的化简求值,熟练掌握运算法则是解本题的关键.21.【答案】证明:(1)∵四边形ABCD 是平行四边形,∴AB =CD ,AB ∥CD .∴∠ABE =∠CDF .在△ABE 和△CDF 中,{mm =mm ∠mmm =∠mmm mm =mm,∴△ABE ≌△DCF (SAS ).∴AE =CF .(2)∵△ABE ≌△DCF ,∴∠AEB =∠CFD ,又∠AEB +∠AEF =180°=∠CFD +∠CFE ,∴∠AEF =∠CFE ,∵AE=CF,∴四八年级(下)数学期中考试题(含答案)一、选择题(本大题共14小题,共28.0分)24.化简√(−2)2的结果正确的是()A. −2B. 2C. ±2D. 425.在▱ABCD中,若∠A=40°,则∠C=()A. 140∘B. 130∘C. 50∘D. 40∘26.下列计算错误的是()A. 3√3+2√2=5√5B. √8÷2=√2C. (−√3)2=3D. √8−√2=√227.一个平行四边形绕着它的对角线的交点旋转90°,能够与它本身重合,则该四边形是()A. 矩形B. 菱形C. 正方形D. 无法确定28.如图,在△ABC中,AB=6,AC=10,点D,E,F分别是AB,BC,AC的中点,则四边形ADEF的周长为()A. 8B. 10C. 12D. 1629.若√m+3有意义,则x能取的最小整数值是()A. 0B. −2C. −3D. −430.如果梯子的底端离建筑物5米,13米长的梯子可以达到该建筑物的高度是()A. 12米B. 13米C. 14米D. 15米31.如图,在▱ABCD中,AD=6,AB=4,DE平分∠ADC交BC于点E,则BE的长是()A. 2B. 3C. 4D. 532.如图所示:数轴上点A所表示的数为a,则a的值是()A. √5+1B. −√5+1C. √5−1D. √533.正方形具有而菱形不一定具有的性质是()A. 对角线平分一组对角B. 对角线互相垂直平分C. 对角线相等D. 四条边相等34.如图,正方形ABCD中,AE垂直于BE,且AE=3,BE=4,则阴影部分的面积是().A. 16B. 18C. 19D. 2135.如图,把矩形ABCD沿EF对折后使两部分重合,若∠1=50°,则∠AEF=()A. 110∘B. 115∘C. 120∘D. 130∘36.已知a+1m =√6,则a-1m的值为()A. √2B. ±√2C. 2D. ±237.如图,在Rt△ABC中,∠B=90°,AC=120cm,∠A=60°,点D从点C出发沿CA方向以4cm/秒的速度向点A匀速运动,同时点E从点A出发沿AB方向以2cm/秒的速度向点B 匀速运动,当其中一个点到达终点时,另一个点也随之停止运动.设点D、E运动的时间是t秒.过点D作DF⊥BC于点F,连接DE,EF.当四边形AEFD是菱形时,t的值为()A. 20秒B. 18秒C. 12秒D. 6秒二、填空题(本大题共4小题,共12.0分)38.比较大小:√13______2√3.(填“>”、“=”、“<”).39.如图,四边形ABCD中,若去掉一个60°的角得到一个五边形,则∠1+∠2=______度.40.如图,在直角三角形ABC的三边上,向外做三个正方形,其中两个的面积为S3=110,S2=60,则另一个正方形的边长BC为______ .41.若m分别表示3-√2的小数部分,则m2的值为______ .(结果可以带根号)三、解答题(本大题共7小题,共60.0分)42.计算(1)√32-√18+√12.(2)(√48-√27)÷√3.43.当x=√2-√3时,求代数式x2-√2x+√6的值.44.如图,是由边长为1的小正方形组成的正方形网格,设顶点在这些小正方形顶点的三角形为格点三角形,图中已给出△ABC的一边AB的位置.(1)请在所给的网格中画出边长分别为2,2√5,4的一个格点△ABC;(2)根据所给数据说明△ABC是直角三角形.45.在数学课上,老师提出如下问题:已知:Rt△ABC,∠ABC=90°求作:矩形ABCD.小敏的作法如下:①作线段AC的垂直平分线交AC于点O;②连接BO并延长,在延长线上截取OD=BO;③连接DA,DC.则四边形ABCD即为所求.判断小敏的作法是否正确?若正确,请证明;若不正确,请说明理由.46.如图所示,在一次夏令营活动中,小明从营地A点出发,沿北偏东60°方向走了5√3km到达B点,然后再沿北偏西30°方向走了5km到达目的地C点.(1)求A、C两点之间的距离;(2)确定目的地C在营地A的什么方向上.47.如图,在▱ABCD中,点E、F分别是BC,AD上的点,且BE=DF,对角线AC⊥AB.(1)求证:四边形AECF是平行四边形;(2)①当E为BC的中点时,求证:四边形AECF是菱形;②若AB=6,BC=10,当BE长为______ 时,四边形AECF是矩形.③四边形AECF有可能成为正方形吗?答:______ .(填“有”或“没有”)48.如图,正方形ABCD的对角线AC,BD相交于点O,延长CB至点F,使CF=CA,连接AF,∠ACF的平分线分别交AF,AB,BD于点E,N,M,连接EO,已知BD=2√2.(1)求正方形ABCD的边长;(2)求OE的长;(3)①求证:CN=AF;②直接写出四边形AFBO的面积.答案和解析1.【答案】B【解析】解:原式=|-2|=2.故选:B.根据=|a|计算即可.本题考查了二次根式的性质与化简:=|a|.2.【答案】D【解析】解:∵在▱ABCD中∠A=40°,∴∠C=∠A=40°,.故选D.根据平行四边形的对角相等即可得出∠C的度数.本题考查平行四边形的性质,比较简单,解答本题的关键是掌握平行四边形的对角相等.3.【答案】A【解析】解:A、2与3不能合并,所以A选项的计算错误;B、原式=2÷2=,所以B选项的计算正确;C、原式=3,所以C选项的计算正确;D、原式=2-=,所以D选项的计算正确.故选A.根据二次根式的加减法对A、D进行判断;根据二次根式的除法法则对B进行判断;根据二次根式的性质对C进行判断.本题考查了二次根式的混合计算:先把二次根式化为最简二次根式,然后进行二次根式的运算,最后合并同类二次根式.在二次根式的混合运算中,如能结合题目特点,灵活运用二次根式的性质,选择恰当的解题途径,往往能事半功倍.4.【答案】C【解析】解:因为平行四边形对角线互相平分,绕着它的对角线的交点旋转90°,能够与它本身重合,说明对角线互相垂直平分且相等,所以该四边形是正方形.故选C.根据题意,该四边形的对角线互相垂直平分且相等.此题考查了平行四边形的性质及与特殊四边形的关系,属基础题.解题时要根据旋转的性质解答.5.【答案】D【解析】解:∵点D,E,F分别是AB,BC,AC的中点,∴DE∥AC,EF∥AB,DE=AC=5,EF=AB=3,∴四边形ADEF是平行四边形,∴AD=EF,DE=AF,∴四边形ADEF的周长为2(DE+EF)=16,故选:D.根据三角形的中位线定理,判断出四边形ADEF平行四边形,根据平行四边形的性质求出ADEF的周长即可.本题考查了三角形中位线定理,利用中位线定理判断出四边形ADEF为平行四边形是解题的关键.6.【答案】C【解析】解:∵有意义,∴x+3≥0,解得:x≥-3,∴x能取的最小整数值是:-3.故选:C.直接利用二次根式有意义的条件得出x的取值范围,进而得出答案.此题主要考查了二次根式有意义的条件,正确得出x的取值范围是解题关键.7.【答案】A【解析】解:如图所示,AB=13米,BC=5米,根据勾股定理AC===12米.故选:A.根据梯子、地面、墙正好构成直角三角形,再根据勾股定理解答即可.此题是勾股定理在实际生活中的运用,比较简单.8.【答案】A【解析】解:∵四边形ABCD是平行四边形,∴BC=AD=6,CD=AB=4,AD∥BC,∴∠ADE=∠DEC,∵DE平分∠ADC,∴∠ADE=∠CDE,∴∠CDE=∠DEC,∴EC=CD=4,∴BE=BC-EC=2.故选:A.由四边形ABCD是平行四边形,可得BC=AD=6,CD=AB=4,AD∥BC,得∠ADE=∠DEC,又由DE平分∠ADC,可得∠CDE=∠DEC,根据等角对等边,可得EC=CD=4,所以求得BE=BC-EC=2.此题考查了平行四边形的性质、角平分线的定义与等腰三角形的判定定理.注意当有平行线和角平分线出现时,会出现等腰三角形.9.【答案】C【解析】解:图中的直角三角形的两直角边为1和2,∴斜边长为:=,∴-1到A的距离是,那么点A所表示的数为:-1.故选:C.先根据勾股定理求出三角形的斜边长,再根据两点间的距离公式即可求出A点的坐标.本题考查的是勾股定理及两点间的距离公式,解答此题时要注意,确定点A的符号后,点A所表示的数是距离原点的距离.10.【答案】C【解析】解:正方形的性质:正方形的四条边相等,四个角都是直角,对角线互相垂直平分且相等,并且每一条对角线平分一组对角;菱形的性质:菱形的四条边相等,对角线互相垂直平分,并且每一条对角线平分一组对角;因此正方形具有而菱形不一定具有的性质是:对角线相等;故选:C.根据正方形和菱形的性质容易得出结论.本题考查了正方形和菱形的性质;熟练掌握正方形和菱形的性质是解题的关键;注意区别.11.【答案】C【解析】解:∵AE垂直于BE,且AE=3,BE=4,∴在Rt△ABE中,AB2=AE2+BE2=25,∴S阴影部分=S正方形ABCD-S△ABE=AB2-×AE×BE=25-×3×4=19.故选:C.由已知得△ABE为直角三角形,用勾股定理求正方形的边长AB,用S阴影部分=S正-S△ABE求面积.方形ABCD本题考查了勾股定理的运用,正方形的性质.关键是判断△ABE为直角三角形,运用勾股定理及面积公式求解.12.【答案】B【解析】解:根据题意得:∠2=∠3,∵∠1+∠2+∠3=180°,∴∠2=(180°-50°)÷2=65°,∵四边形ABCD是矩形,∴AD∥BC,∴∠AEF+∠2=180°,∴∠AEF=180°-65°=115°.故选B.根据折叠的性质,对折前后角相等.本题考查图形的翻折变换,解题过程中应注意折叠是一种对称变换,它属于轴对称,根据轴对称的性质,折叠前后图形的形状和大小不变,如本题中折叠前后角相等.13.【答案】B【解析】解:∵a+=,∴(a+)2=a2++2=6,∴a2+=4,∴a2+-2=2,∴a-=±.故选:B.首先求出(a+)2=a2++2=6,进而得出(a-)2=2,即可得出答案.此题主要考查了完全平方公式的应用,根据已知得出a2+的值是解题关键.14.【答案】A【解析】解:由题意CD=4t,AE=2t,∵DF⊥BC于F,∴∠DFC=90°在Rt△DFC中,∵∠C=30°,∴DF=CD=2t,∴DF=AE,∵∠CFD=∠B=90°,∴DF∥AE,∴四边形DFEA是平行四边形,∴当DF=AD时,四边形DFEA是菱形.∴120-4t=2t,∴t=20s,∴t=20s时,四边形DFEA是菱形.故选A.首先证明四边形DFEA是平行四边形,再根据AD=DF,列出方程求出t即可解决问题.本题考查菱形的性质、平行四边形的判定,一元一次方程等知识,解题的关键是灵活运用所学知识解决问题,学会构建方程解决问题,属于中考常考题型.15.【答案】>【解析】解:∵2=,>,∴>2.故答案为:>.本题需先把2进行整理,再与进行比较,即可得出结果.本题主要考查了实数大小关系,在解题时要化成同一形式是解题的关键.16.【答案】240【解析】解:∵四边形的内角和为(4-2)×180°=360°,∴∠B+∠C+∠D=360°-60°=300°,∵五边形的内角和为(5-2)×180°=540°,∴∠1+∠2=540°-300°=240°,故答案为:240.利用四边形的内角和得到∠B+∠C+∠D的度数,进而让五边形的内角和减去∠B+∠C+∠D的度数即为所求的度数.考查多边形的内角和知识;求得∠B+∠C+∠D的度数是解决本题的突破点.17.【答案】5√2【解析】解:∵∠ACB=90°,∴BC2+AC2=AB2,∵S1=BC2,S2=AC2,S3=AB2,∴S1+S2=S3,∴S1=100-60=50,∴BC=5.故答案为:5.根据正方形的面积公式,运用勾股定理可以证明S1+S2=S3,进而可得出结论.本题考查勾股定理,正方形面积公式,解题的关键是证明S1+S2=S3,记住这个结论在以后解题中会有帮助,属于基础题中考常考题型.18.【答案】6-4√2【解析】解:∵1<<,∴3-的小数部分是3--1=2-,∴m2的值为(2-)2=6-4.故答案为:6-4.根据1<<,可得m的值,根据代数式求值,可得答案.本题考查了估算无理数的大小,利用了算术平方根越大被开方数越大,代数式求值.19.【答案】解:(1)原式=4√2-3√2+√2,2=√2+√22√2;=32(2)原式=(4√3-3√3)÷√3,=√3÷√3=1.【解析】(1)首先化简二次根式,进而得出答案;(2)首先化简二次根式,进而利用二次根式除法运算法则求出答案.此题主要考查了二次根式的混合运算,正确化简二次根式是解题关键.20.【答案】解:当x=√2-√3时,原式=(√2-√3)2-√2(√2-√3)+√6=2-2√6+3-2+√6+√6=3.【解析】将x的值代入代数式进行计算.本题考查二次根式运算,涉及公式的应用,代数式求值问题,属于基础问题.21.【答案】解:(1)如图,△ABC即为所求;(2)由图可知,AB=4,BC=2,AC=2√5,∵AB2+BC2=20,AC2=20,∴AB2+BC2=AC2,∴△ABC是直角三角形.【解析】(1)根据勾股定理找出C点,再顺次连接即可;(2)根据勾股定理的逆定理即可得出结论.本题考查的是作图-应用与设计作图,熟知勾股定理是解答此题的关键.22.【答案】解:小敏的作法正确.理由如下:∵线段AC的垂直平分线交AC于点O,∴AO=CO,∵BO=DO,∴四边形ABCD为平行四边形,∵∠ABC=90°,∴四边形ABCD为矩形.【解析】利用基本作图得到OA=OC,OB=OD,则利用平行四边形的判定方法可判断四边形ABCD为平行四边形,然后根据矩形的判定方法得到四边形ABCD为矩形.本题考查了作图-复杂作图:复杂作图是在五种基本作图的基础上进行作图,一般是结合了几何图形的性质和基本作图方法.解决此类题目的关键是熟悉基本几何图形的性质,结合几何图形的基本性质把复杂作图拆解成基本作图,逐步操作.也考查了矩形的判定.23.【答案】解:(1)过B点作直线EF∥AD,∴∠DAB=∠ABF=60°,∵∠EBC=30°,∴∠ABC=180°-∠ABF-∠EBC=180°-60°-30°=90°,∴△ABC为直角三角形,由已知可得:BC=5km,AB=5√3km,由勾股定理可得:AC2=BC2+AB2,所以AC=√mm2+mm2=10(km),即:A、C两点之间的距离为10km;(2)在Rt△ABC中,∵BC=5km,AC=10km,∴∠CAB=30°,∵∠DAB=60°,∴∠DAC=30°,即点C在点A的北偏东30°的方向上.【解析】(1)根据平行线的性质,可得∠ABF,根据直角三角形的判定,可得∠ABC,根据勾股定理,可得答案;(2)根据直角三角形的性质,可得∠CAB,根据角的和差,可得答案.本题考查了勾股定理的应用,利用了方向角,平行线的性质,直角三角形的性质,勾股定理.24.【答案】(1)证明:∵四边形ABCD是平行四边形,∴AD∥BC,AD=BC,∵BE=DF,∴AF=EC,∴四边形AECF人教版八年级(下)期中模拟数学试卷(含答案)一.选择题(共10小题,每小题4分,满分40分;在每小题给出的四个选项中,只有一项是符合题目要求的,请把答案写在答题卡的相应位置)分1.(4分)下列式子中,最简二次根式的是()A.B.C.D.2.(4分)如图,数轴上的点A所表示的数为x,则x的值为()A.B.﹣C.2D.﹣23.(4分)如图△ABC中,AB=6,AC=5,BC=8,D、E分别是AB、AC的中点,则DE 的长为()A.3B.2.5C.4D.54.(4分)下列运算正确的是()A.﹣=B.=2C.﹣=D.=2﹣5.(4分)在下列各组数中①1,2,3;②5,12,13;③6,7,9;④,,;可作直角三角形三边长的有()A.4组B.3组C.2组D.1组6.(4分)当x=+1时,式子x2﹣2x+2的值为()A.B.5C.4D.37.(4分)如图,在Rt△ABC中∠C=90°,两直角边AC=6cm,BC=8cm,现将AC沿AD折叠,使点C落在斜边AB上的点E处,则CD长为()A.3B.4C.5D.68.(4分)如图菱形ABCD中,对角线AC=6,BD=8,E为边AD上任意一点,则△BCE 的面积为()A.8B.12C.24D.无法确定9.(4分)如图为某城市部分街道示意图,四边形ABCD为正方形,点G在对角线BD上,GE⊥CD,GF⊥BC,小敏行走的路线为B﹣A﹣G﹣E,小聪行走的路线为A﹣D﹣E﹣F,若小敏行走的路程为3100m,则小聪行走的路程为()A.大于3100 m B.3100 m C.小于3100 m D.无法确定10.(4分)如图Rt△ABC,∠C=90°,分别以各边为直径作半圆,图中阴影部分在数学史上称为“希波克拉底月牙”;当AC=3,BC=4时,计算阴影部分的面积为()A.6B.6πC.10πD.12二.填空题(共6小题,每小题4分,满分24分,请在答题卡的相应位置作答)11.(4分)若二次根式在实数范围内有意义,则x的取值范围是12.(4分)命题“四边相等的四边形是菱形”的逆命题是.13.(4分)如图所示,已知AD∥BC,要使四边形ABCD为平行四边形,需要增加条件.(只需填一个你认为正确的条件即可)14.(4分)已知直角坐标系中,菱形ABCD的顶点A、B、C的坐标分别是A(﹣2,0),B(0,﹣4),C(2,0),则点D的坐标是15.(4分)如图△ABC中,∠C=60°,AB=14,AC=10,则BC的长为.16.(4分)如图,平面直角坐标系中,O为坐标原点,四边形OABC是矩形,点B的坐标为(10,6),点P为BC边上的动点,当△POA为等腰三角形时,点P的坐标为。
2018华育中学八年级英语期中试卷
华育中学2017-2018学年第一学期期中试卷八年级英语2017.11(满分150分,考试时间100分钟)Part 1 Listening (第一部分听力)I. Listening Comprehension 20%A. Listen and choose the right picture 3%1. ________2. ________3. ________4. ________5. ________6. ________B. Listen to the dialogue and choose the best answer to the question you hear 3.5%7. A) Shy B) Pretty C) Serious D) Active8. A) A teacher B) A TV host C) A bank clerk D) A writer9. A) 2:00 B) 2:15 C) 2:30 D) 2:4510. A) By check B) By cash C) By credit card D) By Apple Pay11. A) A TV guide B) A part-time job C) A plan D) A choice of courses12. A) The shoes are too heavy B) The ground is wetC) She doesn’t like the shoes D) It is raining outside.13. A) Some Chinese were hit by local people. B) An earthquake occurred there last night.C) Some tourists were killed in a flash flood. D) Some tourists were injured in a car accident.14. A) A good website helped Alina get some customers.B) Alina helps people by donating clothes and furniture.C) Alina borrowed money from the bank to start her business.D) Alina’s business is to give people advice on creati ng website.C. Listen to the passage and tell whether the following statements are true or false 3.5%15. Barry Haddow travels from Wales to London every day.16. The “Commuter of the Year” competition was organiz ed by an early morning TV program.17. Mr. Haddow won because his commute takes the longest time.18. He travels most of the way by train, and then by taxi.19. He doesn’t like wales, but it’s not as expensive as London.20. He won a rail holiday for himself and his family.D. Listen to the passage and complete the following sentences 10%21. William Baldock is a hero after helping his mother when she _________ __________.22. He rang for an ambulance, telephoned his father ___________ ___________, and then his grandmother.23. While waiting for people to come, William ___________ ____________ his 18-mongth-old sister.24. Steve Lyn was amazed that William knew the __________ __________ to dial.25. Mrs. Baldock was very __________ __________ both William and the ambulance service,Part 2 Phonetics, Vocabulary and Grammar(第二部分语音、词汇和语法)Ⅱ. Choose the best answer 20%26. Which of the underline parts has the different pronunciation from the others?A) business B) luckily C) assistant D) simple27. Gold is measured in ounces when bought in the international market while diamond is sold by __carat.A) a B) / C) the D) an28. Can you see the vase _______ the corner of the table and the cat _________ the corner of the room?A) on…in B)at … in C)on…at D) in…at29. Can you find the answer ________ the question_________ the newspaper?A) of…on B) of…in C) to…on D) to…in30. The car disappeared in a flash after it hit the old lady. The underlined part means________.A) immediately B) nearly C) especially D) badly31. _______the books in the school library will be donated to the Hope Project.A) Nine hundred B) Nine hundreds C) Nine hundred of D) Nine hundreds of32. US secretary Hilary Clinton said recently that she _______ soon to enjoy private life.A) retired B) would retire C) had retired D) will retire33. If a computer crashes, you will lose the file you _________unless you save it regularly.A) are working B) work C) will work D) worked34. The cause he had devoted himself to _______ a perfect success.A) proving B) proved C) was proved D) has been proved35. Fortunately, we had bought a metro map, ________ we would have lost our way home.A) what B) where C) without which D) that36. He is the only one of the employees ______ well paid in this enterprise.A) which is B) who get C) who are D) that is37, I like the way _____ he talks and laughs. _____the saying goes, beauty is in the eye of the beholder.A) in which…As B) which…As C) /…Which D) that…Like38. It was a meeting _______ importance I didn’t realize at that time.A) why B) which C) where D) whose39. – I find it fun and challenging.- It is a job ______ you are doing something serious but interesting.A) where B) which C) when D) that40. Which of the following sentence is correct?A) I think he shouldn’t give up.B) He has not decided when he would fly to Beijing.C) I asked him when he had arrived.D) Could you tell me which is the way to the hospital?41. The hotel is almost finished, but it ______ needs one or two weeks to get ready for guests.A) only B) also C) still D) even42. It is time for him to __________these foolish ideas and become serious.A) put away B) put up C) put up with D) put out43. Joint efforts have been made ________the pressure on water demand.A) relieve B) relieving C) relieved D) to relieve44. I have ___ homework to do today, and some of the English exercises are ___difficult for me.A) too much … too much B) too much… much tooC) much too … too much D) much too… much too45. People who live in a small village are bound to see a good _____ of each other.A) sum B) quantity C) deal D) amountCompany Builds W orld’s First Automobile Vending Machine (自动贩卖机) Thanks to used-car website Carvana, it is now possible to buy your own set of wheels at the touch of a button, from the world’s first and only coin-operated car vending machine in Nashville, Tennessee. It’s quick, easy, and not cheap, but cheaper than buying a car the old way.The company has been working on the concept for the past two years. Their original car vending machine was installed in Atlanta in 2013. But they’ve spent time 46 the design, in order to take user experience to the next level. “Our new Vending Machine is a state-of-the-art, multi-story structure that delivers our customers’ cars by merely inserting a special coin,” said Carvana CEO Ernie Garcia.The machine 47 a five-story glass tower that can hold up to 20 cars at a time. The tower basically serves as a pickup point for used cars that customers 48 through the website, 49 competitive pricing and eliminating delivery costs.Customers can 50 a long list of specifications, ratings, reviews, and lots of other details about the cars they’re interested in on the Carvana website. They even get virtual tours that point out every scratch on the body of the car. Once the car is chosen and paid for, the company usually delivers the car to the customer for a seven-day trial period. This usually means the delivery costs are worked into the price of the vehicle.But with the Vending Machine, customers are able to go to pick up their cars straight away. It’s a win-win 51 that allows Carvana to cut down on staff and overhead (间接费用), and save customers about $2,000 52 . According to the company, it also makes for a great buying experience –placing an oversized coin in a slot (硬币投币口) and watching their car roll down automatically.“Caravan’s mission is to 53 a better way to buy a car, and this new Vending Machine will be a one-of-a-kind experience, mirroring just how simple and easy we’ve made it to buy a car online,” Garcia said. He added the company plans to build more car vending machines in the future.Ⅳ. Complete the sentences with the given words in their proper forms 8%54. Is it right to say we count in ______ because we have ten figures? (ten)55. Henry was so excited when receiving the ____________guitar as a gift, for it was his favoritemusical instrument. (electricity)56. He would like to spend as much time as he can __________ideas with his parents.(change)57. The wonderful performance they put on last night was beyond Howard’s _________. (expect)58. You should be brave enough to report the __________ you see to the police. (thief)59. In fact, I found some of the students are smart but act____________. (responsibility)60. Our chemistry teacher told us that we could find ______ either in chemistry lab or in chemical factory. (chemistry)61. You’d better give a full___________ which agrees with the facts of the situation. (explain) V. Rewrite the following sentences as required 14%62. I will finish my homework in one or two hours. (对划线部分提问)_______ _______ will you finish your homework?63. The firemen stopped working when all the workers were saved. (保持句意基本不变)The firemen ________ stop working ________ all the workers were saved.64. The news report is very wonderful.(改为感叹句)_________ ________ wonderful news report it is!65. Now students rarely use abacuses to deal with math problem. (改为反意疑问句)Now students rarely use abacuses to deal with math problem, ________ ________?66. Do you know whose house this was in the 20th century? (保持句意基本不变)Do you know ________ ________ this house in the 20th century?67. She asked me if I would go to the cinema the next day. (改为简单句)She asked me ________ _______ go to the cinema the next day.68. you, than, shorter, to, used, she, that, believe, to, hard, is, it, be (连词成句)_____________________________________________________________________Translation 10%69. The computers can_______________________________________________________________________(在一瞬间精确地给出这道题的答案)70.He has finished__________________________________________(对机器人编程).Now it is___________________________________________________________(足够聪明来更好地接受人们的指令)71. The father always rides his bike to _________________________________________________________ (地铁站接他的女儿).72. My boss sometimes_________________________________________(与他的客户一边吃午饭一边讨论公事)73.The police didn’t ____________________because he ____________________________________________(警察没有把他从监狱释放因为他承认违法了)Part 3 Reading and WritingA. Choose the best answer 12%(A)Cities are taking interest in electric scooter-share systems as an affordable transportation to cut down on pollution and traffic jams. The electric scooters, which weigh between 30 and 40 pounds, reach speeds of about 15 mph.In September 2017,Santa Monica, California, became the first U.S. city tohave an electric scooter-share service. Users find and unlock one of the more than1,000 scooters with a smartphone app. A ride costs $ 1,and then 0.15 cents foreach minute of riding throughout the beach town.night to them, and places them around Santa Monica each morning ready for people’s use. The company was created by Travis VanderZanden, who once worked in Uber and Lyft, after he realized ridesharingBird’s system has served more than 50,000 riders who have taken 250,000 trips — more than half of which have been in the last month. It’s since expanded (扩张) to Venice, California, and some neighborhoods in Los Angeles and San Diego. Bird plans to expand to lots of markets by the end of 2018.Competitors, backed by millionaires, are appearing. Two bike-share startups Lime Bike and Spin, have spoken of plans to provide electric scooters in cities this year.Electric scooters have also gotten the attention of Mayor Pete Buttigieg from South Bend,Indiana. The city is interested in using them as a way to improve public transportation. South Bend was one of the first to use bike-share systems, which allow people to park ridesharing bikes on public land. “We love to be early pioneers,” said Buttigieg. “If we work out the safety problem, we w ould be open to welcoming the technology.”“We need to make sure these new transportation systems are lawful and safe for users,”Constance Farrell,a spokeswoman for the city of Santa Monica told CNN. “We would like to see electric scooters continue to operate in the city. They are in line with our goal of multi-modal living and carbon-light living. ” According to Farrell,there have been eight accidents, including one with a serious head injury, in Santa Monica after the scooters rolled out. Users are required to have a driver’s license (驾照),should not ride on sidewalks or have other passengers on board.Bird has given out free helmets to some riders and tells its users to ride in bike lanes, but some users ride on sidewalks, and most U.S. streets don’t have bike lanes.“The global community of cities is going to have to work this all out for scooters,”Buttigieg said. “They can move unbelievably quickly. That’s exciting,and a little dangerous. ”74. Why did Travis create Bird Company?A. Because he received support from millionaires and the government.B. Because many cities had electric scooter-share services.C. Because it is lawful and safe to use electric scooters.D. Because cities need better ridesharing services.75. The words “are in line with” in Paragraph 6 probably mean “”.A. stopB. meet the need ofC. changeD. are ahead of76. What can we learn from the passage?A. Future electric scooters will be very slow and sale.B. Electric scooters will cause fewer accidents than cars.C. More cities will try to help with electric scooters service.D. Future traffic problems will be solved with help of electric scooters.(B)Diet Coke, diet Pepsi, diet pills, no-fat diet, vegetable diet… We are surrounded by the word “diet” everywhere we look and listen. We have so easily been attracted by the promise and potential of diet products that we have stopped thinking about what diet products are doing to us. We are paying for products that harm us psychologically and physically.Diet products weaken us psychologically. On one level, we are not allowing our brain to admit that our weight problems lie not in actually losing the weight, but in controlling the consumption of fatty, high-calorie, unhealthy foods. Diet products allow us to jump over the thinking stage and go straight for the counter instead. All we have to do is to swallow or recognize the word “diet”in food brands.On another level, diet products have greater psychological effects. Every time we have a zero-calorie drink, we are telling ourselves without our awareness that we don’t have to work to get results. Diet products make people believe that gain comes without pain, and that life can be without resistance and struggle.The danger of diet products lies not only in the psychological effects they have on us, but also in the physical harm that they cause. Diet foods can indirectly harm our bodies because consuming them instead of healthy foods means we are preventing our bodies from having basic nutrients(营养成分). Diet foods and diet pills contain zero calorie only because the diet industry has created chemicals to produce these wonder products. Diet products may not be nutritional, and the chemical that go into diet products are potentially dangerous.Now that we are aware of the effects that diet products have on us, it is time to seriously think about buying them. Losing weight lies in the power of minds, not in the power of chemicals. Once we realize this, we will be much better able to resist diet products, and therefore prevent the psychological harm that comes from using them.77. From Paragraph 1, we can learn that __________A. diet products can bring out people’s potentialB.people have difficulty in choosing diet productsC. diet products are misleading peopleD. people are fed up with diet products78. The purpose of writing this passage is _________.A. to warn people of the side effect of diet productsB. tell people how to lose weightC. to advise people to eat diet productsD. to introduce some diet products79. Which of the following shows the structure(结构) of the passage?CP: Central Point P: Point SP: Sub-point(次要点) C: ConclusionB. Choose the words or expressions and complete the passage 12%When we think of green buildings, we tend to think of new ones----the kind of modern, solar-paneled masterpieces that make the covers of architecture magazines.But the US has more than 100 million existing homes, and it would be incredibly wasteful to tear them all down and replace them with greener versions.An enormous amount of energy and resources went into the construction of those houses.And it would take an average of 65 years for the 80 carbon emissions(排放) from a new energy-efficient (节能) home to make up for the 81 lost by destroying an old one.So in the broadest sense, the greenest home is the one that has already been built.But at the same time, nearly half of US carbon emissions come from heating, cooling and powering our homes, offices and other buildings."You can't deal with climate 82 without dealing with existing buildings,"says Richard Moe, the president of the National Trust.With some exceptions, the oldest homes tend to be the least energy-efficient.Houses built before 1939 use about 50% more energy per square foot than those built after 2000, mainly due to the tiny cracks and gaps that expand over time and let in more outside air.83 , there are a vast number of relatively simple changes that can green older homes, from 84 ones like Lincoln's Cottage to your own postwar home.And efficiency upgrades (升级) can save more than just the earth; they can help protect property owners from rising power 85 .80. A. reduced B. increased C. used D. destroyed81. A. magazines B. trees C. materials D. resources82. A. improvement B. appearance C. stability D. change83. A. Oppositely B. Unfortunately C. Fortunately D. Frankly84. A. historic B. worthless C. ordinary D. meaningless85. A. prices B. costs C. businesses D. bargainsC. Read the passage and fill in the blanks with proper words 16%Hailing from Sweden, “plogging” is a fitness craze that sees participants pick up plastic litter while jogging—adding a virtuous, environmentally driven element to the sport. Plogging appears to have started around 2016, but is now going (86)a , due to increasing awareness and fear over plastic levels in the ocean.The appeal of plogging is its simplicity —all you need is running gear and a bin bag, and the feeling of getting fit while supporting a good cause. By adding regular squats (蹲) to pick up junk and carrying (87)w to jogging, we can assume the health benefits are increased.Running and good causes have always gone hand in hand —just think of all the fundraising marathon runners do. But there couldn’t be a more on-trend way of keeping fit than plogging.Anything that’s getting people out in nature and connecting positively with their environment is a good thing, says Lizzie Carr, an environmentalist who helped set up Plastic Patrol, a nationwide campaign to rid our inland waterways of plastic pollution. “There’s been a real shift in the public mindset around plastics, helped by things like Blue Planet highlighting how disastrous the crisis is,” she says.We need to keep momentum high and the pressure up, and empower people through initiatives like plogging and Plastic Patrol.The Plastic Patrol app (88)a users to map plastic anywhere in the world by collecting discarded items, photographing them and uploading to the app, giving us a better knowledge of what sorts of plastic and which brands are being thrown out. “I’d urge all ploggers to get involved,” adds Carr.Plogging isn’t the first fitness trend to combine running wi th a good cause. Here are some of our (89)f :Good GymIts idea is (90)s : go for a run, visit an elderly person, have a chat and some tea, and run back.(91)L among the elderly is a growing problem in the UK. With over 10,000 runs so far, however, Good Gym is finding a solution.Guide RunningGuide runners (92)v their time to helping blind people get active. By linking themselves together, the visually impaired individual can feel (93)s while both work up a sweat.Cycling for the HomelessStart-up Stuart Delivery and the Church Housing Trust collaborated last year in bringing clothing and healthy food to the homeless. Deliveries are mostly made by bike, so those who deliver keep fit while helping rough sleepers.D. Answer the questions 10%Everybody likes to laugh sometimes, whether at a funny joke, an amusing incident or a hilarious(非常滑稽的) photograph or sound. Comedians who parody(滑稽地模仿) well known people always tickle my funny bone!(令人发笑) The great thing is that once we've had a good laugh, we feel happier. It would seem therefore, that bringing a bit of humor into more serious situations might be good for us.Places like a humorless office or a tense classroom could sometimes do with a good dose of laughter. I know that in my workplace; a bit of hilarity(欢乐,欢闹) can go a long way towards making it a more enjoyable place to spend eight or so hours a day. Seeing the funny side of things can certainly lift our spirits and that in turn can make us feel better about what we're doing.Maybe we should get inspiration(灵感) from Steve Carlisle, president of General Motors of Canada. When he walks around the firm's Ontario headquarters he shares his sense of humor to bond(亲近,团结) with his staff. He says "It can help people feel more relaxed, more comfortable and thus be more effective at what they do." Humour can be used by teachers in the classroom too. It's a good way to break the ice(打破沉默) with students and create a more relaxed atmosphere which is good for learning, as long as everyone doesn't spend all their time in hysterics!(狂笑)But we have to be careful; not everyone laughs at the same things. While some of us may admire a work colleague or fellow student for their clever and well-told joke, others may consider them sarcastic,(讽刺的,挖苦的)offensive(讨厌的) or just an idiot! According to Professor Schweitzer, from the University of Philadelphia's Wharton School, a worker or boss who successfully uses humor is seen as both confident and competent(有能力的), which in turn increases his or her status? He says "Being funny is taking a risk, and being risky shows confidence." His study 'Risky Business: When Humour Increases and Decreases Status' also found that someone who tells inappropriate(不合适的)jokes is also seen as confident but they're also regarded as incompetent.So telling the right jokes in the office or classroom can spread some happiness but if you still think working and studying is no laughing matter(严肃的事情), take note of a study published in The Journal of Behavioral and Applied Management in 2006, that found for healthcare workers, emotional exhaustion was significantly lower among those who experienced greater levels of fun at work. And other research has discovered that teams who share more jokes gave more supportive and constructive statements to each other – and that's no joke!94. How does Steve Carlisle, president of General Motors of Canada, try to get along with his employees?95. According to Professor Schweitzer, from the University of Philadelphia's Wharton School, how doesa worker have to use humor if he or she is to appear confident and competent?96. True or false: A study found health workers got greater levels of emotional exhaustion when they had fun at work.97. Which word used in the article means ' respect and approve of someone or their behavior'?98. How competent is someone seen as when they tell inappropriate jokes?VII. Writing 20%99.Writing a passage with at least 100 words on the topic “The Most Difficult Moment in My Life”.生活中困难在所难免,每个人或多或少都经历过一些困难的时刻。
上海民办华育中学人教版八年级上册期中生物期中试卷及答案-百度文库
上海民办华育中学人教版八年级上册期中生物期中试卷及答案-百度文库一、选择题1.下列有关水螅的说法,正确的是()A.有口有肛门B.身体由内、中、外三层细胞构成C.身体圆筒状,两侧对称D.体表有用于攻击和防御的刺细胞2.为探究环境因素对蚯蚓生活的影响,有同学设计了下面的实验:取3个大小一样的广口瓶,分别贴上甲、乙、丙标签。
在甲、丙瓶中放入湿润的肥沃土壤,在乙瓶中放入经烘干的肥沃土壤。
然后在3瓶中同时各放入5条大小及生活状况相同的蚯蚓(如图)。
观察一段时间,下列实验现象描述错误的是A.乙瓶中的蚯蚓蠕动能力会明显减弱B.蚯蚓的呼吸依靠湿润的体壁来完成C.甲乙两瓶的实验现象说明:影响蚯蚓生活的环境因素是水分D.若将丙装置放在暗处,则可以进一步探究光对蚯蚓的影响。
可选择乙丙作为对照实验3.鲍鱼是营养丰富的海鲜,它的贝壳叫石决明可以入药。
推测它应属()A.节肢动物B.软体动物C.爬行动物D.甲壳动物4.近年来,随着生态文明的建设,山东多地发现了“桃花鱼”(如图)。
研究发现,“桃花鱼”的身体有口无肛门,体壁由内外两层细胞构成。
下列动物中与“桃花鱼”亲缘关系最近的是()A.水螅B.涡虫C.血吸虫D.小银鱼5.如图是三种动物特征比较的示意图,交叉部分为共同特征。
表示恒温动物的是()字母A.A B.B C.C D.D6.能正确表示动物与其气体交换部位的是①蚯蚓---体壁②鲫鱼-----鳃③家鸽----肺和气囊④青蛙-----鳃和皮肤⑤家兔-----肺A.①③⑤B.①②④C.①②⑤D.②③⑤7.小明找到四个与动物有关的成语,其中所涉及到的动物都属于恒温动物的成语是()A.[虎]头[蛇]尾B.[鹬][蚌]相争C.[蛛]丝[马]迹D.[鸡][犬]不宁8.下列属于我国特产的珍稀哺乳动物的一组是()A.大熊猫、大鲵B.大熊猫、金丝猴C.金丝猴、丹顶鹤D.藏羚羊、扬子鳄9.图是人体上臂肌肉示意图,以下说法不正确的是()A.端起水杯喝水时,1 收缩,2 舒张B.1、2 在人体结构层次中都属于器官C.手臂自然下垂时,1、2 都舒张D.1 两端的肌腹绕过关节连在不同的骨上10.模型构建是学习生物学的一种有效策略。
上海民办华育中学人教版八年级上册期中生物期中试卷及答案-百度文库
上海民办华育中学人教版八年级上册期中生物期中试卷及答案-百度文库一、选择题1.下列不属于水螅和海葵的共同特征是A.都生活在海洋中B.都是两胚层动物C.都具有刺细胞D.有口无肛门2.近年来有用活水蛭吸取术后淤血、使血管畅通;又用水蛭配其他活血解毒药,应用于治疗肿瘤。
请问水蛭和下列哪种动物亲缘关系最近?()A.蛔虫B.线虫C.沙蚕D.蜈蚣3.关于动物的结构,下列说法错误的是()A.线形动物和环节动物都有肛门B.水螅的外胚层有刺细胞C.节肢动物体表有外骨骼D.昆虫都有一对触角、两对翅、三对足4.图是鱼的形态结构示意图,有关说法错误的是()A.②下方为鳃,鳃丝内有丰富的毛细血管B.①③④⑥在鱼的游泳运动中起协调作用C.⑤是侧线,能减少水中游泳时遇到的阻力D.体表常覆盖鳞片,表面有黏液,起保护作用5.图是家鸽内部结构示意图,下列表述错误的是A.①是气管,②是气囊,③是肺B.气体进入体内的途径是①→③→②C.家鸽在呼气时,均能在②③内同时进行气体交换D.鸟类特有的双重呼吸提高类气体交换的效率,适于空中飞行6.下面有关鸟类适于空中飞行生活的形态结构和生理特点的叙述,错误的是()A.体表覆羽,前肢变成翼B.食量大,为飞行生活提供大量能量C.用肺和气囊进行气体交换D.有发达胸肌,能有力扇动两翼7.初夏时节,池塘里可以看到小蝌蚪。
下列和蝌蚪呼吸方式相同的动物是()A.娃娃鱼、草鱼、乌龟B.青蛙、带鱼、鸽子C.泥鳅、海马、鲨鱼D.鳄鱼、海豚、缢蛏8.下列关于胎生、哺乳的叙述正确的是()A.所有哺乳动物都是以胎生的方式繁殖后代 B.哺乳为幼仔成长提供优越的营养条件C.胎生提高了哺乳动物的产仔率D.胎生、哺乳提高了幼仔的死亡率9.下列各项叙述中,正确的是A.骨的运动要靠骨骼肌的牵引B.骨骼肌由中间的肌腱和两端的肌腹两部分组成。
C.动物的运动,只靠运动系统和神经系统的控制调节来完成D.所有动物体内都有骨骼10.下列关于骨骼肌的叙述中,错误的是()A.人体骨骼肌由肌腱和肌腹两部分组成B.一块完整的骨骼肌属于器官C.骨骼肌具有受刺激而收缩的特性D.组成人体骨骼肌的肌腱部分主要由肌肉组织构成11.如图为人的屈肘动作示意图,与此有关的叙述正确的是A.肱二头肌收缩,肱三头肌舒张 B.肱三头肌收缩,肱二头肌舒张C.都收缩 D.都舒张12.当你由伸肘状态变为屈肘状态时(如右图),你的上肢肌肉 X和Y会分别处于什么状态?A.X收缩、Y收缩B.X舒张、Y收缩C.X舒张、Y舒张D.X收缩、Y舒张13.哑铃锻炼是一种增强上臂肌肉力量的方法,请结合下图分析,以下说法错误的是()A.屈肘时A处于舒张状态,B处于收缩状态B.A是肱二头肌,由肌腱和肌腹两部分构成C.在神经系统的支配下,骨骼肌收缩牵引着骨绕关节运动D.C是运动系统中的重要结构,具有既牢固、又灵活的特点14.在进行体育运动时,人的膝关节中可以减少骨与骨之间摩擦的是()A.关节头B.关节窝C.关节囊D.关节腔内的滑液15.人体是一个统一的整体。
上海市华育中学2018——2019年八年级下学期Unit 1 测试(无听力,Word版)
Part Ⅱ Vocabulary and Grammar (56%)Ⅰ. Choose the best answer: 25%26. Choose the underlined part with the different pronunciation.A. talentB. gatherC. dramaD. balance27. Which of the following underlined parts is different in pronunciation from others?A. waveB. lendC. exclaimD. label28. Sam was appointed ________ manager of the engineering department to take ________ place of George.A. /, /B. the, /C. the, aD. /, the29. Decades ago, he ________ Austria and ________ there since then.A. has visited, had beenB. flied to, has livedC. has gone to, livedD. left for, has stayed30. This machine is very easy ________. Anybody can learn to use it in a few minutes.A. operatingB. to be operatedC. to be operated onD. to operate31. The tight, thin skin called the ________ can vibrate when hit by sound waves.A. eardrumB. fluidC. hearingD. bud32. It is the responsibility of the government to ________.A. provide homes to old peopleB. provide homes for old peopleC. supply homes for old peopleD. offer homes for old peopleA.BelieveB. To believeC. BelievingD. BelievedC. chemistry…chemicalD. chemical…chemical33.________ , students are taking more mathematics and science courses than in the past.A. On averageB. At averageC. In averageD. Of average34.________ of trees can produce enough oxygen to keep your whole class alive and healthy for a whole year.A. One and a half hectareB. One hectare and a halfC. One and half hectareD. One hectares and half35.The boy always dreams of himself ________ on the moon ________ the sky, with his hands ________ behind hishead.A. lying, over, lainB. lying. above, layingC. laying, over, laidD. lying, above, laid36.Could you tell me ________?A. how many students believe itB. whose it belongs toC. how many students are there in the auditoryD. which place he has been37.This kind of western medicine works ____________________.A. not so quickly as herbal medicineB. as quickly as herbal medicineC. quicklier than herbal medicineD. not as quickly as herbal medicine38.________ the end, the hero disappeared without leaving any trace ________ the end of the street.A. On, onB. By, inC. In, atD. In, until39.Look, the cake ________, and we all want a second piece.A. is tasting deliciousB. tastes deliciousC. is tasting deliciouslyD. tastes well40.--- I hear that your aunt ________ to France once. --- Yes. She ________ there last month.A. went…has beenB. has been…has beenC. goes… wentD. has been…went41.This morning, my mom made me ________ my shoes because they were too dirty.A. cleanB. to cleanC. cleanedD. cleaning42.Cooking breakfast is an ________ job.A. everydayB. every dayC. everyday'sD. every day's43.The writer has collected ________ facts for his book. ________ the places he has been to is impressive.A. a large amount of…A number ofB. a large number of… The number ofC. a large number of…The amount o fD. a large amount of… The number of44.Who ________ this paint brush ________?A. does, belong toB. is, belonged toC. is, belonging toD. has, belong to45.Please help ________ to make orange juice. Our guests are coming soon.A. yourselvesB. meC. youD. yourself46.These rules are made ________ accidents. Everybody should obey them.A. preventingB. preventC. to preventD. prevented47.Jerry told me he ________ on an old man's eyes in the hospital this Sunday.A. will operateB. would operateC. operatedD. has operated48.________ it or not, his discovery has created a stir in scientific circles.A.BelieveB. To believeC. believingD. believed49.The doctor suggested that Mr. Malan ________ an operation right away so as to save his life.A.hadB. would haveC. haveD. was going to have50. --- Could I use the dictionary?--- ________ . It’s a spare one.A. What a shame!B. Just go ahead.C. I’m sorry.D. You’d better not.Ⅱ. Complete the following passage with the words or phrases in the box. 7%A.answerB. definedC. shareD. guiltyE. vanishF. creativeG. beliefH. certaintyI. identifyJ. idealsWhat is it about Americans and food? We love to eat, but we feel ____51____ about it afterward. We say we want only the best, but we strangely enjoy junk food. We’re obsessed with health and weight loss but face an unprecedented epidemic of obesity. Perhaps the ____52____ to his ambivalence(矛盾情结) lies in our history. The first Europeanscame to this continent searching for new spices but went in vain. The first cash crop(经济作物) wasn’t eaten but smoked. Then there was Prohibition, intended to prohibit drinking but actually encouraging more ____53____ ways of doing it.The immigrant experience, too, has been one of inharmon y . Do as Romans do means eating what “real Americans”eat, but our nation’s food has come to be ____54____ by imports --- pizza, say, or hot dogs. And some of the country’s most treasured cooking comes from people who arrived here in shackles.Perhaps it s hould come as no surprise then that food has been a medium for the nation’s defining struggles, whether at the Boston Tea Party or the sit-ins at southern lunch counters. It is integral to our concepts of health and even morality whether one refrains from alcohol for religious reasons or evades meat for political reasons.But strong opinions have not brought ____55____ . Americans are ambivalent about what they put in their mouths. We have become suspicious of our foods, especially as we learn more about what they contain.The ____56____ in food is still prosperous in the American consciousness. It’s no coincidence, then, that the first Thanksgiving holds the American imagination in such bondage(束缚) It’s what we eat --- and how we ____57____ it with friends, family, and strangers that help define America as a community today.Ⅲ. Fill in the blanks with the given words with proper forms: 7% (每空格限填一词)58.Better __________ can lead to an enjoyable cooperation. (communicate)59.Professor Zhang will make several __________ on Chinese art during his stay in the USA. (speech)60.He behaved __________ on the stage after following the teacher’s instructions. (natural)61.Statistics told us how many people buy food in an organized, __________ way. (science)62.Many people think of __________ as being white-coated scientists mixing strange liquids in a laboratory. (chemistry)63.Wars offered nothing but hatred and __________ . (destroy)64.Coffee makes his mind much __________ when writing. (alive)IV. Fill in the blanks with the verbs in their proper forms: 6%65. The zookeeper warn us ________ one step closer to the newborn panda. (not go)66. He stood there, ________ deeply and evenly. (breathe)67. More and more people come to know the importance of stopping the nature from ________ by human. (pollute)68. The U.S. ________ against Germany in World Wars I and II. (fight)69. When he got home, the thief ________ behind the curtain for five minutes. (hide)70. Can you tell me when ________ the meeting tomorrow. (hold)V. Rewrite the sentences as required: 6%71. I don’t suppose he’s been good to everyone, ________ ________?72. Computers will never take the place of human imagination. (句意相同)Human imagination will never ________ ________ by computers.73. I have met hardly any of my old friends during the trip to my hometown. (句意相同)I have met ________ ________ of my old friends during the trip to my hometown.74. He felt their backs with his hands to make sure we were not riding on them.________ ________ he ________ their backs with his hands ________?75. What’s the good of buying a new computer? (句意相同)________ ________ ________ buying a new computer?76. What will life be like in Shanghai? Judy was not sure. (合并句子)Judy was not sure ________ ________ ________ be like in Shanghai.VI. Text and Translation: 4%77. They are natural air conditioners. Three trees can __________________________________.78. For example, when insects attack a tree, it can warn its neighbors. The trees can then____________________________________________________________________________________________ ____.79. 现在每种植一棵树的同时,就有30棵树正在被砍伐。
上海民办华育中学初二上学期测量物理试卷 无答案
上海民办华育中学初二上学期测量物理试卷无答案18届初二上物理测验1 测量(2019/9/18)班级__________ 学号__________ 姓名__________ 一、选择题1.下列各物体中最接近4的是()810μmA.一张课桌的长度B.一支粉笔的长度C.一只文具盒的长度 D.一支乒乓球的直径2.下列数值最接近实际情况的是()A.初中生的体重约为50g B.人步行的速度约为20m/sC.课桌的高度约为80cm D.正常人10次脉博的时间约为1min3.关于各过程所经历的时间,下列说法正确的是()A.书写一个数字所用的时间约为1s B.橡皮从课桌掉到地上的时间约为2sC.升旗唱国歌用时约3min D.普通中学生跑100m用时约10s 4.有一立式摆钟,3天下来走时慢了0.5分钟,为了校正走时,应该()A.使摆线变长B.使摆线变短C.换质量小的摆锤D.换质量大的摆锤5.向量筒中注入水,俯视读数为20毫升,倒出一部分水后,仰视读数为12毫升,则实际倒出来的水的体积()A.小于8毫升 B.大于8毫升C.等于8毫升量结果是相同的C.测量长度时,也可以使用零刻度线磨损的尺子D.测量长度要估读数字,估计的数字越多越好11.要测量出一张普通邮票的质量,下列方案中可行的是()A.先测一只信封的质量,再将邮票贴在信封上,测出信封和邮票的总质量,两次相减得邮票质量B.先测出数百张邮票的质量,再除以邮票的张数C.天平是测质量的精密仪器,直接把一张邮票放在托盘内可以测量出D.用刻度尺测出邮票的长宽厚,计算出邮票体积,再查找出有关纸的密度,算出邮票的质量12.使用托盘天平测量物体的质量时,下列各种情况会造成测量结果比真实值偏小的是()A.调节天平的横梁时,指针偏向分度盘中线处的左侧就停止调节B.使用天平的横梁时,指针偏向分度盘中线处的右侧就停止调节C.使用的砝码已经磨损D.测量者的头部偏向分度盘中线处的右侧,造成视线与指针不垂直13.中华人民共和国的国旗为长方形五星红旗,如图是天空门广场升旗仪式的场景,根据图片中提供的信息估测该国旗的宽度,下列数据最接近实际情况的是()A.1.8m B.3.3m C.4.8m D.5.5m14.小红和小明各自用刻度尺测量同一张课桌面的长度,小红测量的结果是122.9cm,小明测量的结果是1.228cm,下列说法中正确的是()A.小红的读数比小明的准确B.小明所用刻度尺的分度值是1mmC.两人所用刻度尺的分度值是不同的D.两人中至少有一个测量结果是错误的15.用直尺和三角板测圆柱体直径,下图中方法正确的是()A.B.C.D.16.如下表所示,某小组同学在探究摆的等时性过程中,记录了以下数据,经过推理可知,若要使摆的周期恰好为1.5秒,还需要研究下列哪一种情况()摆线长度l(厘米)604530连续摆动10次的时间(秒)18.613.411.8A.>60l厘米l厘米B.45厘米<<60C.30厘米<<45l厘米l厘米D.<3017.用最小刻度是mm的刻度尺测量物体的长度,若用m作单位,则记录结果中小数点后数字有()A.1位B.2位C.3位D.4位18.下列情况中,质量会发生变化的是()A.粉笔写字后变短了B.铁块在高温下变成铁水C.把一根金属棒拉成金属丝D.跳到水里游泳的人,觉得自己变轻了19.小明同学在调节天平平衡时,发现无论怎么调节都不能把天平调平衡,后来,他想了个办法,在左盘内放了0.4g沙子,终于把天平调平衡了,于是,他开始称量物体,当右盘放50g砝码时,天平刚好平衡,则该物体的质量是()A.50g B.50.4g C.49.6g D.无法判断20.在用托盘天平测固体质量时,某同学发现他的同桌当天平的指针还在分度盘中线的右侧就用它来读物体的质量了,这样测得的固体的质量比它的实际质量()A.偏大B.偏小C.相等D.以上情况都有可能21.某同学用最大称量为500克,最小刻度为0.2克,最小砝码为5克的托盘天平称量一铁块的质量,当调节横梁平衡后,他将铁块放在天平的右盘,砝码放在天平的左盘,同时移动游码,当天平平衡时,他读出铁块的质量是77.8克,测量结束后,他还未觉察出自己的失误,则铁块的实际质量应是()A.77.8克B.72.2克C.78克D.77.6克22.某同学用一把刻度均匀的米尺量得一桌边长为0.980m,然后发现该米尺与标准尺相比,此米尺的实际长度为1.002m,则桌边的实际长度是()A.1.00m B.0.982m C.1.020m D.0.987m二、填空题23.给下面数据填上合适的单位符号:(1)万里长城全长6700__________;(2)人走一步约40__________;(3)一分硬币厚度约为1__________;(4)一张纸的厚度是70__________.24.__________叫做质量,质量的国际单位是__________.质量是物质的一种__________.25.误差与错误的区别是:__________是可以消除的,而__________是不可避免的,只能减小,主要方法是__________.26.用刻度尺先后5次测量同一物体的长度,测量结果分别是1.51分米2次、1.52分米2次、1.50分米1次,则物体的长度为__________,刻度尺的最小分度值为__________.27.图为AB两把刻度尺同时测量一个木块的长度,则AB的读数分别为__________、__________.28.同学用刻度尺测得教室黑板长3.45,他的错误是__________,应该写成__________,所用的刻度尺的最小刻度为__________.29.一把钢尺冬天测量结果与夏天测量结果比较,冬天的测量结果比夏天的结果__________.(选填“大”“不变”或“小”)30.有三把刻度尺,规格不同.A.钢板尺;量程25cm,分度值是mm;B.钢卷尺:量程2m,分度值是mm;C.皮卷尺:量程20m,分度值是cm.请把完成下列测量需要选用的测量工具填在横线上的空白处:(选填字母)(1)测量课桌的长度用__________;(2)测量三级跳远的成绩用__________;(3)测量小笔记本的长度用__________.31.某同学用打点计时器研究物体的运动情况.纸带从静止开始通过打点计时器记录的运动情况如图所示,观察纸带上点的分布状况,可以判断纸带在向__________(选填“左”或“右”)做__________(选填“匀速”、“加速”或“减速”)运动;a、d两点的时间间隔为__________s.32.如果天平砝码的质量比标准质量小一点,那么测出物体的质量将会__________;一把刻度尺测得的长度数值比真实值偏小,则该刻度尺的刻度比标准刻度__________(选填“偏大”、“不变”或“偏小”).33.某同学测得一本书的厚度是8.0mm.他数了一下,封面和插页共为5张纸,正文部分没有.他翻到最后看了一下,正文共190页.这本书的每张纸的平均厚度为__________m,相当于__________μm.34.某同学用滚动铁环的方法来测学校花坛的周长,他测得铁环的直径为D,铁环绕花坛一周滚动的圆数为N,则计算花坛周长L的公式为L __________.35.如下两项实验:①用刻度尺测细铜丝直径:把细铜丝在铅笔上紧密排绕50圈,然后用刻度尺量出线圈的总长度再除以50;②测一个大头针的质量:先测出100枚大头针的总质量,再除以100.这两项实验的思想方法是相同的,这两实验所遇到问题的共同特点是__________,解决办法的共同特点是__________.36.在“测量盐水的质量和体积”的实验中:(1)将天平放在__________桌面上,游码移至称量标尺左端的“0”刻度线上后,若发现天平指针在分度盘上如图甲所示,则可判定下一步应该进行的操作是__________.(2)测盐水的质量时,需先测__________的质量1m,再测__________的质量2m,则液体的质量的表达式为,天平平衡时,所用砝码和游码在标尺上的位置如图乙所示,若120gm ,则盐水的质量为__________g.然后,将烧杯中的盐水全部倒入量筒中,液面到达的位置如图丙所示,读数时视线应__________,则量筒中盐水的体积为__________3cm.甲乙丙37.小玲、小红和小丽在操场上玩荡秋千,小丽把小玲、小红分别轻轻推了一下,细心的小丽发现,她俩往返摆动一次的时间几乎一样,那么,秋千往返摆动一次的时间与哪些因素有关呢?三人对此问题进行研究,提出了以下猜想:猜想1:秋千往返摆动一次所用的时间可能与人的质量有关.猜想2:秋千往返摆动一次所用的时间可能与秋千摆动时离开中心线的最大距离有关.猜想3:秋千往返摆动一次所用的时间可能与千秋的绳长有关.为了验证上述猜想,他们来到实验室,找来刻度尺、秒表、细线、小球.依照物理学习中的科学方法,按图进行实验,得到下表中的数据.实验序号小球质量/gm摆线长/mL小球摆动距中心线最大距离/mS小球往返摆10次所用的时间/st小球往返摆动1次所用的时间/st1200.80.1018.0 1.80220 1.00.1420.0 2.00320 1.20.1022.0 2.20430 1.00.1420.0 2.00530 1.00.1020.0 2.00请你通过分析回答下列问题:(1)为验证猜想1,分析比较实验序号__________,可知__________.(2)为验证猜想2,分析比较实验序号__________,可知__________.(3)为验证猜想3,分析比较实验序号__________,可知__________.第 11 页。
上海民办华育中学初中物理八年级上册期中测试(包含答案解析)
一、选择题1.下列各组固体都是晶体的一组是()A.固态水银铁海波B.食盐冰糖玻璃C.冰松香雪花D.萘铜沥青2.夏天妈妈从冰箱冷冻室取出一块牛排,刚取出时牛排表面①冒着“白气”,放在空气中解冻一会儿,塑料包装表面出现②密密的小水珠,等到牛排③变软之后,妈妈就知道牛排解冻好了。
上面描述的三个现象中,物态变化相同的是()A.①②B.①③C.②③D.①②③3.下列物态变化现象中,与冬天进入温暖的室内眼镜发雾原因相同的是()A.黄河冰凌B.冰雪融化C.草叶露珠D.枝头挂霜4.如图所示的四个物态变化的实例中,属于吸热现象的是()A.“雾凇”的形成B.“露珠”的形成C.“冰柱”的形成D.正在变小的干冰5.图中,老师用同样的力吹一根吸管,并将它不断剪短,他在研究声音的()A.音调是否与发声体的材料有关B.响度是否与发声体的频率有关C.音调是否与发声体的长短有关D.音色是否与发声体的结构有关6.一个锣鼓队正在表演。
观众们发现,每当队员用手按住正在发声的鼓面,原本听到的鼓声就“消失”了。
你认为主要原因是()A.手不能传播声音B.手吸收了声波C.手使鼓面停止了振动D.手把声音反射回去7.下列有关声现象的叙述错误的是()A.声音都是靠空气来传播的B.声音传播的速度与响度无关C.面对听力较弱者要提高音量讲话D.企鹅妈妈能在众多小企鹅的叫声中辨别出自己的“孩子”8.下列声现象中,主要不是利用声音传递信息的是()A.蝙蝠靠超声波发现昆虫B.超声波清洗机C.倒车雷达D. B 超检查身体9.某物体做变速直线运动,已知它在前14路程的平均速度为1m/s,后34路程的平均速度2m/s,那么它在整个路程中的平均速度是()A.1m/s B.1.5m/s C.1.6m/s D.2m/s10.小明一次50m短跑过程训练中,测得从起点到达不同位置所经历的时间如图所示,则下列说法中正确的是()A.小明通过第2个10m所用的时间为4.00s B.前20m小明一定做匀速直线运动C.小明通过距离0点20m处的速度一定为5m/s D.小明全程的平均速度为6.25m/s11.对于做运动的物体,根据公式=svt,下列说法正确的是()A.路程一定,速度越大,时间越长B.时间一定,速度越大,路程越小C.在同一个匀速直线运动中,速度与通过的路程成正比,与运动时间成反比D.在同一个匀速直线运动中,速度是定值,与物体通过的路程和时间均无关12.下列情况不属于...机械运动的是()A.空中飞行的小鸟B.月亮升上了天空C.水中游动的鱼D.铁生锈了二、填空题13.在抗击新型冠状病毒期间,医护人员必须穿着厚厚的防护服,戴上口罩和护目镜。
上海市华育学校八年级初二上学期英语期中复习卷一(含答案)
初二英语期中复习(一)Part Two Vocabulary and GrammarI.Choose the best answer:1.These students who study in________school can speak a little________.A.an Europe,FrenchB.a Europe,FranceC.a European,JapaneseD.an European,Germany2.I was busy________my bedroom last Sunday.A.tidyingB.tidiesC.to tidyD.that I tidy3.This rope is________.A.six-feet-tallB.six-metres longC.six inch deepD.six inches long4.Please write a short report on________.A.what does Sidney do every dayB.what does Sidney do everydayC.what Sidney does every dayD.what Sidney to do everyday5.He lived________on a________island,but he didn’t feel________.A.alone;along;lonelyB.lonely;lonely;aloneC.alone;lonely;lonelyD.lonely;alone;alone6.________different life today is from what was20years ago.A.What aB.HowC.WhatD.How a7.I will meet you at the airport when you________there.A.arrive atB.arriveC.will reachD.get to8.There Jack found a map on the wall,________?A.wasn’t thereB.didn’t thereC.didn’t heD.wasn’t he9.They had to learn as many skills as they could when they were young,________?A.didn’t theyB.had theyC.did theyD.hadn’t they10.Jack,a good friend of________,showed a picture of________to me.A.me,hisB.mine,heC.mine,himselfD.me,him11.They got to the top of the hill________the morning________April5.A.on...onB.in...onC.on...ofD.in...of12.Can you tell me________about________?A.some thing,youselfB.somethings,yourselfC.something,yourselfD.some things,youself13.Jackie Chan is________A.a man with ambitiousB.a man with ambitionsC.am ambition manD.ambition14.Tim together with Tom and Mary________there when the meeting beganA.areB.isC.wasD.were15.There are some differences________twins________many ways.A.between,andB.between,inC.from,fromD.from,in16.He left in such a hurry________he forget________the door.A.so,lockingB.so;to lockC.that,lockingD.that,to lock17.The children got________.They thought the maths lessons was________.A.bored,boringB.boring,boredC.interest,interestingD.interesting,interested18.Listen to the tape.You will hear six people________about their________life.A.talking,dairyB.talk,dairyC.talking,dailyD.talk,daily19.If he finishes his homework first,his parents________him to watch TV for a while.A.will allowB.allowsC.will be allowedD.are allowed20.--I hear that our aunt________to France once.--Yes.She________there last month.A.went...has beenB.has been...has beenC.goes...wentD.has been...went21.His talk made me________in the modern music.A.interestingB.to interestC.interestedD.interest22.The two friends were________pleased to see each other that they forget everything.A.soB.tooC.veryD.much23.--Do you still have a headache,Bill?--No,it’s________.I’m all right now,mum.A.droppedB.runC.leftD.gone24.The number of the people in the world________growing faster and faster.。
上海华育中学人教版八年级上册期中生物期中试卷及答案-百度文库
上海华育中学人教版八年级上册期中生物期中试卷及答案-百度文库一、选择题1.我国长江中下游一带及长江流域以南地区流行的血吸虫病,是由血吸虫感染引起的,血吸虫的中间宿主是A.蜗牛B.石鳖C.海螺D.钉螺2.如图是蚯蚓的形态结构示意图,下列叙述,正确的是A.雨中或者雨后会有大量蚯蚓爬出地面,其主要目的是外出寻找食物B.将蚯蚓放置在干燥的沙土中不久将会死亡,原因是干燥的沙土温度太高C.图中A为蚯蚓前端,B为蚯蚓后端,判断依据是A端靠近(1)环带而B端远离(1)环带D.蚯蚓身体由许多相似的(2)体节构成,雌雄同体,异体受精,因此蚯蚓属于节肢动物3.节肢动物是最大的动物类群,下列节肢动物属于昆虫的是()A.瓢虫B.蜘蛛C.蜈蚣D.河虾4.鲟鱼是体形大、寿命长的一种淡水鱼类(如图),开发利用的价值极大。
目前,人们已掌握了鲟鱼的人工取卵和孵化技术,我市一些地方已大力发展了鲟鱼养殖业,取得了显著的经济效益。
以下有关叙述正确的是()A.鲟鱼的生殖方式是体外受精,体外发育B.鲟鱼体形大,属于体内受精的胎生动物C.寿命长的原因是遗传物质不断发生变异D.鲟鱼的人工取卵和孵化技术属于克隆技术5.两栖动物指的是()A.空中飞行的动物以陆地或水域作为栖息地B.水中生活的动物到陆地上产卵C.昆虫幼体生活在水中,成体生活在陆地上D.幼体生活在水中用鳃呼吸,成体营水陆两栖生活,用肺呼吸,皮肤辅助呼吸6.图是三种动物的特征比较示意图,交叉部分为共同特征,以下对应不正确的是()A.有脊柱B.体内受精C.水中生活D.恒温动物7.下列哪项不属于鸟类特有的特征()A.体表覆羽B.前肢变成翼C.有气囊辅助肺呼吸D.通过产卵繁殖后代8.以下关于胎生、哺乳的叙述,不正确的是()A.绝大多数哺乳动物以胎生的方式繁殖后代B.哺乳为幼仔成长提供优越的营养条件C.胎生提高了哺乳动物的产仔率D.胎生、哺乳大大降低了幼仔的死亡率9.图是人体上臂的两组肌肉协调活动示意图, 屈肘时①、②分别处的状态是A.①收缩、②收缩B.①收缩、②舒张C.①舒张、②收缩D.①舒张、②舒张10.图是人的长骨结构示意图。
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Part II V ocabulary and GrammarI. Choose the best answer. 20%26. Be careful not to wake the baby.A. /keə’fl/B. /kiə’fl/C. /’keəfl/D. /’kiəfl/27. Which of the following underlined parts is different in pronunciation from others?A. She was standing o n one foot.B. I won’t leave u ntil you come back.C. She was unable to c o ntain her excitement.D. Who will pay the electricity bill?28. A little boy wrote “u” and “n” on the wall.A. a; anB.an; aC.an; anD. a; a29. I have lost my pen. I must buy today.A. itB. thisC. oneD. that30. Y ou’ve got so many books. Could you please lend me to read?A. anythingB. anyC. somethingD. some31. They’ve taken everything with .A. themB. themselvesC. theyD. their32. She had to borrow a new in order to attend the party.A. clothB. clothesC. clothingD. dress33. useful information board you have made!A. HowB. WhatC. How aD. What a34. I am not sure how long Oliver .A. has joined the armyB. has joined in the armyC. has served the armyD. has served in the army35. What is the chemical symbol water?A. aboutB. ofC. onD. for36. a father, she has a younger brother to support.A. BesideB. BesidesC. ExceptD. Except for37. I hate to admit it, I think I was wrong.A. andB. butC. orD. so38. He’s an engineer, he can deal with problems.A. electricity, electricalB. electrical, electricalC. electrical, electricD. electrical, electricity39. History repeat itself.A. needs notB. need notC. doesn’t needD. need not to40. What did you about water pollution at the meeting?A. talkB. sayC. speakD. tell41. In the past few years, great changes in Shanghai.A. there wereB. there have hadC. there had beenD. there have been42. Joyce suggested .A. them talk it over among themselvesB. them talked it over among themselvesC. they talk it over among themselvesD. they talked it over among themselves43. Where do you think T onny the jacket?A. did, buyB. did, boughtC. has, boughtD. /, bought44. Which sentence is correct?A. I wonder where you have gone.B. I wonder where they visited.C. I wonder when you have finished the task.D. I wonder what is the matter with you.45. -- John and I will celebrate our fortieth wedding anniversary next month.-- Oh, !A. cheer upB. well doneC. go aheadD. congratulationsII. Fill in the blanks with the proper forms of the words: 7%46. They have both behaved than before and I am very hurt. (bad)47. Y ou can reduce these long to simple charts or diagrams. (explain)48. In cold weather, everything seems to be frozen. (freeze)49. Our government is trying to take to prevent and control pollution. (measure)50. My father exercises because he doesn’t have enough time. (regular)51. They do not have the to apologize for their actions. (encourage)52. A friend is a living treasure, and if you have one, you have one of the gifts in life. (value)III. Fill in the blanks with the verbs in their proper forms: 7%53. Such negative thoughts and feelings make some people feel like up.(give)54. I didn’t know a thing about the verbs, for I my lesson. (not study)55. The miners alive when the tunnel collapsed. (bury)56. Look! Jerry and he belongs to a ski club. (ski)57. I hope you the secret of how to be happy. (find)58. I don’t think Renee saw us. She a watch for her father. (choose)59. Let us hold our hands and the environment. (not pollute)IV. Rewrite the sentences as required: 6%60. Daisy was told not to eat sweets any more.(反义疑问句)?61. The doctor took good care of the wounded.(改为被动句)The wounded good care of by the doctor.62. I don’t know if I will go with you tomorrow.(同义句转换)I don’t know go with you tomorrow.63. Life in our cities will be inconvenient without electricity.(划线提问)will life in our cities without electricity?64. Benny wanted to trick his sister.(同义句转换)Benny wanted to his sister.65. machine, makes, kinds, works, it, goods, the, of, that, all(连词成句)V. Complete the following passage with the words or phrases in the box. Each word or phrase can only be usedMore Than a Ride to SchoolThe National Education Association claims. “The school bus is a mirror of the community.” They further add that, unfortunately, what appears on the exterior does not always reflect the reality of a chosen community. They are right--- sometimes it reflects more! Just ask Liesl Denson. Riding the school bus has been more than a ride to school for Liesl. Bruce Hardy. school bus driver for Althouse BUS Company has been Liesl’s bus driver since kindergarten. Last year when Liesl’s family moved to Parkesburg, 66 her bus went by her new residence, she requested to ride the same bus.This year Liesl is a senior and will enjoy her last year riding the bus. She sa ys, “It’s been a great ride 67 ! My bus driver is so cool and has always been a good friend and a good listener. Sometimes when you’r e a child, adults do not think that what you have to say is important. Mr. Hardy always listens to what you have to say and makes you feel important.” Her friends Ashley Batista and Amanda W olfe agree 68what Liesl said. Bruce Hardy has been making Octorara students feel special since 1975. This year he will celebrate 40 years working for Althouse Bus Company. Larry Althouse, president of the company, acknowledges Bruce Hardy’s outstanding record, “Y ou do not come by employees like Bruce these days. He has never missed a day of work and has a perfect driving record. He was recognized in 2000 by the Pennsylvania School Bus Association for driving 350,000 accidentfree miles. Hardy’s reputation is made 69 evident through the relationships he has made with the students that ride his bus.”Althouse further adds, “Althouse Bus Company was established 70 years ago and has been providing quality transportation 70 . My grandfather started the business with one bus. Althouse Bus Company is delighted to have the opportunity to bring distinctive and safe service to our local school and community and looks forward to continuing to provide quality service for many more years to com e.”Three generations of business is not all the company has enjoyed. Thanks 71 drivers like Bruce Hardy, they have been building relationships through generations, Liesl’s mother Carol also enjoys fond memories of riding Bruce Hardy’s bus to the Octorara School District.Part III Reading and WritingA. Choose the best answer 5%The Exploding Lakes of CameroonWhat comes to mind when you think of a lake? Y ou probably imagine a pretty scene with blue water, birds, and fish. For the people in the northwestern Cameroon, however, the image is very different. For them, lakes may mean terrible disasters. In 1984, poisonous gases exploded out of Lake Monoun and came down into the nearby villages, killing thirty -- seven people. T wo years later, Lake Nyos erupted a cloud of gases rolled down the hills and into the valleys and killed1,700 people.Lake Nyos and Lake Monoun are crater (火山口) lakes. They were formed when water collected in the craters of old volcanoes. The volcanoes under Lake Nyos and Lake Monoun are not active anymore. However, poisonous gases from the center of the earth continue to flow up through cracks in the bottom of the lake. This is normal in a crater lake. In most crater lakes, these gases are released often because the water ‘t urns over’ regularly. That is, the water from the bottom of the lake rises and mixes with the water at the top, allowing the gases to escape slowly.However, in Lakes Nyos and Monoun, there is no regular turning over. No one knows the reason for this fact, but as a result, these lakes have more gases tapped at the bottom than other crater lakes. In fact, scientists who have studied LakesNyos and Monoun have found 16,000 times more gases. When a strong wind, cool weather, a storm, or a landslide (滑坡)causes the water to turn over suddenly, the gases escape in a violent explosion.In the past, no one knew when the gases might explode, so there was no way for the villagers to escape disaster. Now scientists from the United States, France, and Cameroon have found a way to reduce the gas pressure at the bottom of Lake Nyos. They stood a 672-foot plastic pipe in the middle of the lake, with one end of the pipe near the bottom and the other end in the air. Near the top of the pipe, the team put several holes that could be opened or closed by a computer. Now, when the gas pressure gets too high, the holes are opened and some of the gas-filled water shoots up through the pipe into the air like a fountain. With less pressure, a disastrous explosion is much less likely. However, the scientists are not sure that one pipe will be enough to prevent explosions. They hope to put in others soon and they plan to install a similar pipe and a computer system at Lake Monoun as well.T o protect people nearby until all of the pipes are in place, the scientists have installed early warning systems at both lakes. If the gas pressure rises to a dangerous level, computers will set off loud sirens (警报) and bright lights to warn thepeople in the villages. That way, they will have time to escape from the dangerous gases.72. What will happen when Lake Nyos and Lake Monoun explode?A. W ater will flow down the hills.B. Poisonous gases will be released suddenly.C. A strong wind will rise from the lakes.D. The volcanoes will come to life.73. Which of the following statements about Lake Nyos and Lake Monoun is true?A. They were formed in 1984B. They are at the top of two active volcanoes.C. They are not like most other crater lakesD. W ater in them turns over regularly.74. Lake Nyos and Lake Monoun explode because .A. the gases rise to the top and mix with airB. people from the villages turn over the waterC. scientists have put in a computer systemD. they have more gases trapped at the bottom than other crater lakes75. A team of scientists has .A. erected a pressure-releasing pipe in the lakeB. identified the gases at the bottom of the lakeC. built a beautiful fountain near the lakesD. removed all dangerous gases from the lakes76. What do we learn from the last paragraph?A. Scientists are planning to install pipes in all crater lakesB. Scientists still do not know how to prevent gas explosionsC. Explosion disasters could be avoided in the futureD. W arming systems have been set up in the villages nearby.B. Choose the words or expressions and complete the passage. 8%It was just getting dark; there was a touch of fog and I was on a lonely stretch of road. But I was going along cheerfully, thinking about the dinner I would eat when I got to Salisbury.I was going along quietly at about thirty-five miles an hour when suddenly I heard a scream, a woman’s scream –“Help!” I looked round, but the only 77 _ of life was a large, black, rather suspicious-looking(看起来可疑的) car just turninga bend in the road about a hundred yards away. That was 78 the cry had come from: I 79 speed and went after it. I thought the driver saw what I was doing, for he did the same and began to draw away from me. As I drew near,the girl’s voice came again, a lovely voice but trembling(发抖)with fear.“Let me go, you fool; you’r e hurting me. Oh! O h!”I felt my blood 80 _. The fog was coming down thicker now, the countryside was lonelier. The man in the car had no 81 noticed this. Again, came a cry.“Drop the knife, fool. Oh!” Then a cry and a groan.If I was to save her, it was now or 82 _. Perhaps even now I was too late. But if I couldn’t save the girl, I would 83_ try to bring the murderer to the police station. The car was only a couple of yards away now. I drove the bike right across its path, and its brakes screamed as the driver tried to pull it over and crashed into the ditch (沟渠) on the side of the road. The door of the car was pushed open angrily and a dark, evil-looking fellow stepped out, mad with anger.“Foo l!” he shouted _84_ he came towards me with his fist raised to hit me. But I was quicker than he. I put all I knew into a blow that would have knocked out Joe Louis. It caught him right on the ground without a sound. I rushed to the car, pulled the door and peered inside. There was no girl there. Suddenly from the back of the car came a voice.“Y ou have been listening to a radio play. Murder in Hollywood, with Mae Garbo and Clark T aylor. The news will follow immediately. “77. A. person B. sign C. figure D. form7 8A. how B. when C. what D. where7 9A. put aside B. put up C. put down D. puton8 0A. boil B. run C. come D. freeze8 1A. sign B. effort C. doubt D.troubles8 2A. late B. then C. ever D. never8 3A. at most B. at least C. at last D. atfirst8 4A. before B. after C as D. whileC. Read the passage and fill in the blanks with proper words 6%A Chimps(黑猩猩) will cooperate in certain ways, like gathering in war parties to protect their territory. But beyond the minimum requirements as social beings, they have little instinct (本能) to help one a 85 . Chimps in the wild seek food for themselves. Even chimp mothers regularly decline to share food with their children, who are able from a young age to gather their own food.In the laboratory, chimps don’t naturally share food either. If a chimp is put in a cage where he can pull in one plate of food for himself or, with no great effort, a plate that also provides food for a neighbor to the next cage, he will pull at random---he just does n’t care whether his neighbor gets fed or not. Chimps are truly selfish.Human children, on the other hand are extremely cooperative. From the earliest ages, they desire to help others, to share information and to participate in a 86 common goals. The psychologist Michael T omasello has studied this cooperativeness in a series of experiments with very young children. He finds that if babies aged 18 months see a worried adult with hands f 87 trying to open a door, almost all will immediately try to help.There are several reasons to believe that the urges to help, inform and share are not taught, but n _88_ possessed in young children. One is that these instincts appear at a very young age before most parents have started to train children to behave socially. Another is that the helping behaviors are not improved if the children are rewarded. A third reason isthat social intelligence d 89in children before their general cognitive(认知的)skills, at least when compared with chimps. In tests conducted by T omasello, the children did no better than the chimps on the physical world tests, but were considerably better at understanding the social world.The core of what children’s minds have and chimps’ don’t is what T omasello calls shared intentionality. Part of this ability is that they can infer what others know or are thinking. But b _90_ that, even very young children want to be part of a shared purpose. They actively seek to be part of a “we”, a g roup that intends to work toward a shared goal.D. Read the following passage and answer the questions 5%Being an astronaut sounds cool, doesn’t it? In space, they can do some pretty amazing things, like floating in zero gravity.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 in space. 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. “T ear s,” he said, “don’t fall off your eyes. They just stay there. “Be sides making your vision 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 astronaut s’ eyes, and when tears suddenly wet the eyes, it can cause pain rather than comfort. “My right eye is painful like cr azy” F eustel 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 -- “W hen 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. W e usually take them for granted, 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 end up throwing up (呕吐) everything in their stomachs, according to the UK National Space Center.Thus perhaps it’s only space explorers who can honestly sa y: “Gravity, you’r e the best.”91. Crying isn’t more difficult in space than on the earth, is it?92. Who experienced that the tears in space caused pain rather than comfort?93. How do astronauts get rid of the tears in space?94. Why can’t astronauts burp in space?95. In the last paragraph, the writer says: perhaps it’s only space explorers who can honestly sa y: “Gravity, you’r e thebest. “Do you agree with the writer? Why or why not?E. Writing 10%Write a passage of at least 60 words on the topic. “The fun of learning _(English/painting/to play the piano/to play basketball..).Necessary points1. What’s your experience of learning _?2. Why do you think learning is fun?(注意:短文中不得出现考生的姓名、校名及其他相关信息,否则不予评分.)26-30 CAACD 31-35 ADDDD 36-40 BBBBB 41-45 DCDDD46. worse 47. explanations 48. freezing 49. measures 50. irregularly 51. courage 52. most valuable53. giving 54. hadn’t studied 55. were buried 56. is skiing 57. will find 58. was choosing 59. not pollute60. wasn’t she 61. were taken 62. whether to 63. What be like 64. play a trick on65. It works that the machine makes all kinds of goods.66-71: HFDGEA 72-76:BCAAC 77-81 BDDAC 82-84 DBC85.another 86.achieving 87.full 88.naturally 89.develops 90.besides91.No,it isn’t92. Astronaut Andrew Feustel.93. They rubbed their eyes against their helmet to wipe the tears away or wait until the tears get big enough to simply break free of the eyes and floated around.94. Because there is no gravity to hold the food down their stomachs.95. Y es, I do. Because with gravity we can do many things in comfort rather than in pain such as cry, burp and so so.。