八年级每日一练A1
初中物理每日一练(基础题)测试
1．如左图所示为一质点沿直线运动的位移一时间图像。
根据图像，求：（1）求开始5s内质点运动的总路程、总位移和平均速度；（2）在右图上画出与位移一时间图像相对应的速度一时间图像（即v－t图像，只需作图，不需要写出分析过程）。
2．一个物体从45m高的地方自由下落，g取10m/s2，求：（1）物体落到地面用了多少时间？（2）整个下落过程平均速度大小是多少？3．一个质量为1kg的物体，从125m高空处从静止下落，求：（重力加速度取10 m/s2）（1）物体落地需要多长时间；（2）物体落地的速度为多少。
4．一辆汽车以v0=54km/h的速度沿平直公路匀速行驶。
（1）若汽车以a1=0.5m/s2的加速度加速，则10s后它的速度能达到多少？（2）若汽车以a2=-3m/s2的加速度减速刹车，则10s后它的速度为多少？5．一个重600N的物体放在水平地面上，要使它从原地移动，最小要用190N的水平推力，若移动后只需180N的水平推力即可维持物体匀速运动，那么：（1）物体与地面间的最大静摩擦力有多大？（2）物体与地面间的滑动摩擦力有多大？（3）物体与地面间滑动摩擦系数为多少？（4）当用250N的水平推力使物体运动后，物体受到的摩擦力有多大？6．如图所示，质量为3kg的物体在水平压力F=50N的作用下沿着竖直墙壁匀速下滑，g取10m/s2，试求：物体与竖直墙之间的滑动摩擦因数。
7．质量为3.0kg的空木箱，放置在水平地面上，沿水平方向施加拉力，当拉力F1=8N 时，木箱静止；当拉力F2=12N时，木箱做匀速运动，g=10m/s2。
已知最大静摩擦力等于滑动摩擦力，求：（1）木箱与地面间的动摩擦因数；（2）木箱在8N的拉力作用下受到的摩擦力大小；（3）木箱在14N的水平拉力作用下，受到的摩擦力大小。
8．如图所示，轻绳OA一端系于天花板上，与竖直方向的夹角为30°，轻绳OB一端系于竖直墙上，O点挂一重30N的物体，当OB绳呈水平时，OA、OB两绳各受多大的拉力。
2020年黑龙江省《内科学》每日一练(第961套)
2020年黑龙江省《内科学》每日一练考试须知：1、考试时间：180分钟。
2、请首先按要求在试卷的指定位置填写您的姓名、准考证号和所在单位的名称。
3、请仔细阅读各种题目的回答要求，在规定的位置填写您的答案。
4、不要在试卷上乱写乱画，不要在标封区填写无关的内容。
5、答案与解析在最后。
姓名:___________考号:___________一、A1(共30题)1.支气管扩张最常见的临床表现是( )A.胸痛B.气短C.间断咯血D.消瘦、贫血E.慢性咳嗽、咳痰,反复感染2.非同步电除颤用于( )。
A.心房颤动B.心室颤动C.心房扑动D.室上性心动过速E.阵发性室性心动过速3.最常见的食管恶性肿瘤是( )。
A.腺癌B.鳞癌C.未分化癌D.类癌E.恶性黑色素瘤4.下述激素中哪一种是甾体激素( )。
A.促肾上腺皮质激素B.肾上腺皮质激素C.促甲状腺激素D.甲状腺激素E.前列腺素5.阵发性室上性心动过速最多发生于( )。
A.低血钾B.洋地黄中毒C.急性心肌梗死D.无器质性心脏病E.甲状腺功能亢进6.Crohn病的最好发部位是( )。
A.口腔B.肛门C.直肠D.乙状结肠E.末段回肠及其相邻右半结肠7.急性肺脓肿痰培养为脆弱类杆菌生长,治疗不应选用( )。
A.青霉素B.林可霉素C.克林霉素D.甲硝唑E.以上都不能选用8.病因学将糖尿病分成四大类型,分别是( )。
A.1型、2型、其他特殊类型、GDM(妊娠糖尿病)B.自身免疫、特发性、胰岛素抵抗、胰岛素分泌缺陷C.正常葡萄糖耐量、糖耐量减低(ICT)、空腹血糖受损(IFG)、糖尿病D.正常血糖、IGT、IFG、高血糖E.1型、2型、ICT、IFG9.皮质醇增多症中24小时尿17-羟和17-酮的排出量可以被大剂量地塞米松所抑制,较大的可能病因诊断是A.肾上腺皮质腺瘤B.肾上腺皮质癌C.肾上腺髓质增生D.肾上腺皮质增生E.异位ACTH综合征10.原发性高血压患者的血管病变是( )。
2022届八年级物理第十五章电流和电路知识总结例题
(每日一练)2022届八年级物理第十五章电流和电路知识总结例题单选题1、如图所示的电路中，电源电压保持不变。
闭合开关S，当滑动变阻器的滑片P向右移动的过程中，下列说法中（）①电压表V的示数不变②电流表A2的示数变小，电流表A的示数变小③电流表A1的示数变大，电流表A的示数变小④电压表V与电流表A2示数的比值变大A．只有①②正确B．只有③④正确C．只有②③④正确D．只有①②④正确答案：D解析：由电路图可知，R1与R2并联，电流表A测干路电流，电流表A1测R1支路的电流，电流表A2测R2支路的电流，电压表V测电源两端的电压。
因电源电压保持不变，所以滑片移动时，电压表V的示数不变，故①正确；可知，通过R2的电流变小，即电流当滑动变阻器的滑片P向右移动的过程中，接入电路中的电阻变大，由I=UR表A2的示数变小，因并联电路中干路电流等于各支路电流之和，所以干路电流变小，即电流表A的示数变小，故②正确；因并联电路中各支路独立工作、互不影响，所以滑片移动时通过R1的电流不变，即电流表A1的示数不变，故③错误；则电压表V与电流表A2示数的比值为R2的阻值，滑片向右移动，电阻变大，电压表V与电流表A2示数的比值变大，故④正确；综上可知，①②④正确。
故选D。
2、关于电荷的说法中正确的是（）A．摩擦起电的实质是创造了电荷B．金属导体中自由电子移动的方向就是电流的方向C．带正电的玻璃棒能吸引纸屑是由于异种电荷相互吸引D．绝缘体不容易导电是因为自由电荷很少答案：D解析：A．摩擦起电的本质是电荷的发生转移，不是创造了电荷，故A错误；B．物理学规定正电荷定向移动的方向为电流方向，金属导体中自由电子移动的方向与正电荷移动的方向相反，因此金属导体中电流方向与自由电子移动的方向相反，故B错误；C．带正电的玻璃棒能吸引纸屑是因为带电体有吸引轻小物体的性质，故C错误；D．绝缘体不容易导电，是因为绝缘体内几乎没有能够自由移动的电荷，而不是没有电荷，故D正确。
人教版八年级物理第一章每天一考(有答案)
八年级物理（上）刘大鹏
9-2物理小考卷
1根据内容的不同，将物理学大致分为五类，其中包括、热学、、光学和原子物理学。
2课堂上物理老师做了两个关于力学的实验，其中一个手劈木板，我们用将木板压住，然后用力将木板劈断；在用漏斗吹乒乓球的实验中，我们分别让同学向上和向下吹乒乓球，无论是向上还是向下吹我们都（填“能”或“不能”）将乒乓球吹出漏斗。
3在做实验“让停止沸腾的水在次沸腾”的实验中，灌入烧瓶的是（填“停止”或“继续”）沸腾的热水，然后在烧瓶上浇（填“热水”或“凉水”），烧瓶里的水会再次沸腾起来。
4在观察透镜的成像现象时，老师将手指放在透镜后并贴近透镜的时候，同学们观察可以看到（填“放大”、“缩小”或“大小不变”）的手指；观察水柱后面的手的时候，老师的手从水柱后面的左侧进入水柱的后面，前面的同学通过水柱看到老师的手是从（填“左侧”或“右侧”）进入水柱的后面的。
5在做“漏水的瓶子”的实验的时候，当老师将瓶子拿起后，瓶子在（填“漏水”或“不漏水”）的时候瓶子盖是不盖的；当老师拿其瓶子后，瓶子在（填“漏水”或“不漏水”）的时候瓶子盖是盖上的。
答题卡
班级姓名
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科学如同大海，要求奋不顾身的拼搏。
——兰道。
八年级英语上册：阅读理解,完形填空每日一练(无答案 人教新目标版
阅读理解&完形填空每日一练MondayIt was Sunday. Little Jim____(1) early. Two of pandas were on show in London for the first time. He didn't see such animals before. So he asked his father, Mr. Black, to take him ____(2) them. After breakfast the father and son ___(3)to the bus stop____(4). After a while, a red bus came and Mr. Black got on it___ (5) his son in his arms. But there was ___(6) in it. He had to stand by the door. A young man___ (7)and said, "Please take my seat, sir. ""Thank you very much," Mr. Black said and sat down. And little Jim sat on his father's knees（膝盖）. "Try to be a gentleman(绅士), Jim," said Mr. Black. "The young must___ (8) for the old and must ask women___ (9) their seats." Just then, a woman got on and stood by Mr. Black. Little Jim jumped off his father's knees at once and said, "Please take____ (10) seat, madam!"(A)China will host the Olympic Games in 2008. We are going to help make the Olympic a success(成功), leaving a good impression（印象） on the whole world. We would like to be volunteers（志愿者）. Kate wants to help the tourists who can’t speak Chinese. She thinks it’s a good way to lea rn English. And Mary is going to be a waitress in a hotel. She wants to serve athletes. She thinks she can meet lots of athletes and make friends with them. Victor is going to clean the floor at the basketball stadium. He can see his favorite basketball players. Selina likes skating very much. So she is going to help the ice skaters do something. Tom and Kin’s favorite sport is table tennis. So they are going to pick up Ping-Pong balls for ping-pong players. At the same time, they can enjoy some beautiful matches. All of us are very happy to be volunteers. ( )1.In which city is the Olympic Games going to be held in 2008?A. BeijingB. ParisC. Sydney( )2.What’s Kate going to d for the 2008 Olympic Games?A. To be a waitress in a hotel.B. To help the tourists who can’t speak Chinese.C. To work in a hotel.( )3.Why is Mary going to be a waitress?A. Because she would like to make friends with athletes.B. She thinks it’s a good way to learn English.C. Because she wants to learn English.( )4.Who is going to help basketball players?A. VictorB. TomC. Mary( )5.What sport does Selina like?A. basketballB. ping-pongC. skating(B)Charlie Chaplin（卓别林） was born in 1889 in London. His mother was a dancer. His father was an actor, but he has not much money. Charlie Chaplain was good at singing and dancing. In 1894, he started dancing and singing for money. In 1904, he joined a travelling theatre company and were to America. In 1910, someone asked him to perform(表演) in a film. And he went to Hollywood(好莱坞). He became a film director in 1914. He worked very hard and he made many funny films between 1914 and 1966. In 1977, he died(死) in Switzerland, people all over the world were very sad.( )6.Charlie Chaplin was born in ______.A. EnglandB. AmericaC. France( )7.Charlie Chaplin’s parents ______.A. made a lot of money by giving performanceB. were not very richC. had a travelling theatre company( )8.Chaplin began to make money(赚钱) when he was _______ years old.A.15B.21C.5( )9.Chaplin became a film actor in ________.A.1894B.1904C.1910( )10.Which of the four is Not true?A.Charlie was only 15 when he came to the USA.B. When Charlie died, nobody was sad.C. Charlie went to Hollywood in 1910.阅读理解&完形填空每日一练TuesdayMrs．Yuan is a writer．She is 1 and often helps the poor persons．It was a very cold 2 morning．On the way to her office, she saw an old man 3 on the ground．She came to him and helped him to 4 and bought some water and bread for him．The old man ate up the food quickly and 5 her very much．Then she asked, “Where do you live, Grandpa?”“I have no 6 , madam,”said the old man．“I have to sleep outside 7 ．”“How old are you?”“Ninety—two , madam．”Yuan became 8 and went on asking, “Why not live in the old people’s house” “ 9 I have a son,”said the old man．“They have 10 admitted（接纳）a person who has children．I have a son．”“Where is your son, then?”“He has no children, so the old people’s house admitted him．”“It’s unfair!”said Mrs．Yuan．（）1．A．strange B．kind C．terrible D．healthy（）2．A．snowy B．rain C．cloudy D．sunny（）3．A．walking B．running C．jumping D．lying（）4．A．hurry B．look up C．sit up D．get on（）5．A．thanked B．hated C．liked D．loved（）6．A．farm B．trees C．clothes D．house（）7．A．at noon B．at night C．every morning D．one morning（）8．A．sad B．sorry C．surprised D．a number（）9．A．As B．Because C．Since D．While（）10．A．never B．always C．often D．Sometimes(A)Mr. White was a very busy businessman. He a1ways worked a11 day. Sometimes he could not have a rest on Sundays，so he usually forgot the date. Last Saturday. he remembered it was his wife's birthday. “I often forget her birthday.” he said to himself，“but not this time.” Then he went to a flower shop and bought some beautiful flowers. When Mr. White got home，he gave the flowers to Mrs. White and said，“Happy birthday! January 15 is your birthday. I didn't forget it.” “Yes. but my birthday was yesterday. It's January 16. But thank you all the same.” Mrs. White said.( ) 1.Mr White was very .A. busyB. freeC. happy( ) 2.Mr White worked on Sundays.A. sometimesB. alwaysC. never( ) 3.Mr White often forgot .A. his workB. his wifeC. his wife’s birthday( ) 4.He bought for his wife.A. a blouseB. a dressC. some flowers( ) 5.Mrs White’s birthday was on .Saturday B.January15 C.January16(B)Mr Jones has a special way of waking Lily in the morning．He sends Lily’s dog, Frank, into her bedroom．Frank jumps up and licks(舔)Lily’s face, then Lily gets out of her bed．That’s how every school day starts．One Monday morning, Lily got out of bed and looked at the clock．It was 6:45．Ｌily washed and dressed．She moved quickly．She knew she didn’t have much time to get ready for school．The school bus usually stops at the corner of her street at 7:30．She has to be at the bus stop by then．“What’s for breakfast?”asked Lily．Her father gave her two eggs and a glass of orange juice．“Ｈurry up,”said Mr Jones．“Where’s your homework? Do you have that note I gave you for Mrs Brown? Don’t forget it．Here’s your lunch money．”Lily got her books and homework all together．She found the note and took the lunch money．She put everything in her schoolbag．Then she rushed off to catch the bus at 7:30．The bus was right on time．Lily got on and sat down next to her friend Bill．Then Lily and Bill started to tell each other jokes．It was nice to relax．（）1．In the morning wakes up Lily．A．Mrs Jones B．Mr Jones C．Frank D．the clock（）2．One Monday morning Lily got up at ．A．６:45 B．7:00 C．7:20 D．7:30（）3．Lily had to take to Mrs Brown．A．her homework B．her dog C．lunch money D．a note（）4．This passage tells us Lily usually to school．A．walks B．rides her bicyle C．takes the bus D．takes the subway （）5．Which of the following is TRUE?A．Lily has a dog． B．Mrs Jones is an English teacher．C．Bill is Lily’s brother．D．Lily likes hamburgers for breakfast．阅读理解&完形填空每日一练WednesdayReading newspapers has become an important part of our everyday life. Some people read newspapers 1 the first thing to do in the morning, others read newspapers as soon as they have free time during the day 2 they can learn what 3 in the world. People just choose their favorite newspapers. Some like the world news, and 4 prefer short stories. Sometimes we don’t have enough time 5 all the news carefully, so we just 6a quick look at the front page. At other time, we 7 be in such a hurry that we only have a few minutes to look at the titles(标题) of the passages.Today, newspapers in English have 8 of readers in the world. The English language is so popular 9 many Chinese students are reading English newspapers, such as China Daily, 21st Century and so on. They bring 10 information together with the Internet. We can’t live without newspapers.( )1. A.for B. to C. like D. as( )2. A. because of B. so that C. though D. such that( )3. A. happens B. happened C. is happening D. will happen( )4. A. some B. others C. the others D. else( )5. A. to read B. read C. reads D. reading( )6. A. get B. take C. bring D. give( )7. A. must B. need C. should D. may( )8. A. the large number B. the larger number C. the largest number D. the most large number ( )9. A. if B. that C. because D. though( )10. A. many and many B. many and more C. more and more D. most and most(A)Sally was a student．It was going to be her mother’s birthday．She wanted to buy her a present that would be nice and useful but not expensive．A week before her mother’s birthaday, she went shopping after a quick and simple lunch．When she had been looking for half an hour, she found a shop that was selling cheap umbrellas, and decided to take a black one since her mother had lost hers the month before．She thought, “You could carry that when you are wearing clothes of any color．”So she decided to buy a lovely black umbrella and took to the school with her until her classes had finished.On her way back home in the train that evening, she felt hungry because she had such a small lunch that she went along to the buffet car(便餐车) for another sandwich and a cup of coffee．She had left the black umbrella above her seat in the compartment （车厢）, but when she got back, it had gone! When she had left the compartment, there had been no other passengers in it, but now there were three．Sally began to cry when she saw that the umbrella was no longer there．The other passengers felt very sorry for her and asked what the matter was．She told them thatthe black umbrella she had bought for her mother was gone, and that she had to get out at the next station．After the three other passengers heard it, they asked her for her mother’s address so that they could send the umbrella to her if someone had taken it by mistake, and brought it back after Sally had got out of the train．The next week, Sally heard from her mother．It said, “Thank you very much for your lovely presents, but why did you send me three black umbrellas?”（）1.Which of the following has the same meaning with the sentence “You could carry that when you are wearing clothes of any color”?A．You can carry it when you are wearing any clothes．B．Any color of your clothes will be all right．C．The umbrella will be OK for your clothes in any colors．D．You can take any clothes that you like to wear．（）2．Where did she find the umbrella missing?A．The compartment．B．Her school．C．The buffet car．D．The shop．（）3．From the passage, we can infer (推断) that ．A．her mother would write to her if she didn’t receive the presentB．the three umbrellas were sent by the girlC．only four peoele had ever been to the compartmentD．nobody brought the umbrella back（）4．The best name of the story is ．A．A Lucky Girl B．The Missing UmbrellaC．Mother’s present D．A Happy Mother（）5．What does the writer want to tell us?A．You should take care of your things when you are traveling．B．Show your love to others, and they will bring you love．C．Chinldren should often come back to see their parents．D．It’s no use crying when you are in trouble．(B)If you can speak English, you know a lot of English words．You can read, speak and understand．But there is another kind of language you need to know- the language of the body．All over the world, people“talk” with their hands, with their heads and with their eyes．When Japanese people meet, they bow (鞠躬；弯腰) ．When Indians meet, they put their hands together．What do American and British people do?Americans are more informal (不拘礼节的) than the British．They like to be friendly．They use first names, they ask questions and they talk easily about themselves．When they sit down, they like to relax in their chairs and make themselves comfortable．British people are more reserved (矜持的，缄默的) ．They take more time to makefriends．They like to know you before they ask you something of your home．When British and American people meet someone for the first time, they shake hands．They do not usually shake hands with people they know well．Women sometimes kiss their women friends, and men kiss women friends．When a man meets a man friend, he just smiles, and says “Hello” ．Men do not kiss each other, or hold hands．Even fathers and sons do not often kiss each other．（）6．People can communicate with each other using ．A．only words B．only body languageC．only the English language D．not only words but also body language （）7．We can learn from the passage that ．A．handshake and kiss can not be used in greetingB．people can “talk” with their hands, heads and eyesC．only a few people use body languageD．body language is more often used by people than words （）8．British people take more time to make friends because ．A．they are quite conservative (保守的)B．they don’t like people to go to their homesC．they are not as friendly as the AmericansD．they find it more interesting to stay alone（）9．When Indians meet, they ．A．kiss each other B．bow to each otherC．put their hands together D．just smile （）10．In the USA and British, ．A．men always kiss their women friends when they meetB．people would like to shake hands whenever they meet their friendsC．women are more likely to kiss each other while men aren’tD．fathers and sons often kiss each other阅读理解&完形填空每日一练ThursdayFlies (苍蝇) usually live in the dirty places.Let’s look at a fly, and see where it 1 . First, it flies out of the window, 2 it stands on 3 dirty things in the street, and then it flies back to the house and walks over your 4 .When a fly walks on the dirty things in the street, its 5 have got some germs 6 them. When the fly walks on your food with its dirty feet, it 7 the germs on your food.What can you 8 this?First, we learn that we mustn’t leave dirty things in the street or on th e ground near 9 . Second, we learn that all food must be covered so that flies may not 1 it. Third, we learn that flies often carry germs and we must kill them as soon as we see them.( )1. A. walks B. stands C. lives D. flies( )2. A. first B. second C. third D. fourth( )3. A. some B. any C. every D. each( )4. A. food B. drink C. cups D. bowls( )5. A. body B. feet C. eyes D. head( )6. A. in B. to C. on D. over( )7. A. carries B. has C. leaves D. takes( )8. A. study from B. study for C. learn for D. learn from( )9. A. the factory B. our door C. our house D. a window( )10. A. arrive B. get C. arrive in D. get to(A)These days most people in Britain and the U. S. A. do not wear very formal clothes. But sometimes it is important to wear the right clothes.Many British people don’t think about clothes very much. They just like to be comfortable. When they want to enjoy themselves, they can wear almost anything. At theaters, cinemas and concerts you can wear whatever you like. From beautiful suits and dresses to jeans and sweaters. Anything goes as long as(只要) you look clean and tidy.But in Britain and the U. S. A. , men in offices usually wear suits and ties, and women wear dresses or skirts(not trousers). Doctors and business people always wear quite formal clothes. And in some hotels and restaurants men have to wear ties and women have to wear tidy dresses.In many ways, Americans are less formal than British people, but they are more careful with their clothes. At home or on holidays, most Americans wear uniforms or sports clothes. But when they go out in the evening, they like to look nice. But in good hotels and restaurants, men have to wear jackets and ties, and women wear pretty clothes.It’s h ard to say exactly what people wear in Britain and the U. S. A., because everyone is different. If you are not sure what to wear, watch first and then do the same. You’ll feel more comfortable if you don’t look too different from everyone else.( )1. People in Britain and the U. S. A. wear informal clothes when they ____.A. go out to enjoy themselvesB. are in officesC. are in big restaurantsD. go out to work( )2. At concerts, doctors wear ____.A. sweatersB. whatever they likeC. what others wearD. like players( )3. Which of the following is not true according to the passage?A. Women are usually not allowed to wear trousers in offices.B. Officers always wear formal clothes even though they are at home.C. Americans are more relaxed in their clothes than British people.D. Though everyone is different, they wear the same clothes in offices.( )4. “Anything goes” in the second paragraph means “____”.A. Any clothes are all rightB. Anything wearsC. All the things around are all rightD. Not any clothes are all right( )5. Men wear ties when they ____ in the U. S. A.A. meet their familiesB. meet their close friendsC. eat something deliciousD. have dinner in good restaurants(B)Quick ServiceA man took a pair of shoes to a shoe repair shop and said to the shoemaker, “I’d like you to repair these shoes for me, please.”“Certainly, sir.” the shoemaker said.“When will they be ready?” the man asked.“I’m a bit busy, but they will be ready for you on Thursday,” he said.“That’s fine.” the man said and left the shop.The next morning he received a letter, offering him a job in another country. Within 24 hours he was on an airplane to his new job.Twenty years passed and he returned to his hometown.He remembered his shoes.“They were a good pair of shoes,” he thought, “I wonder if the shoemaker is still there and still has them. I’ll go and see. ” The same shop, although he was an old man by now.“Good morning. ” he said to the shoe maker, “Twenty years ago, I brought in a pair of shoes. Do you still have them?”“Name?” the old shoemaker asked.“Smith.” the man said.“I’ll go and see. They may be in the back.”The shoemaker went out to the back of his shop and a few minutes later returned, carrying a pair of shoes.“Here they are.” he said, “One pair of brown shoes. I’m a bit busy now, but they’ll be ready on Thursday.”( )1. Why did the man go to a shoemaker?A. They were old friends.B. He wanted him to make a new pair of shoes.C. He wanted him to repair a pair of shoes.D. He had a very old pair of boots. He wanted to repair it.( )2. Why didn’t the man return to the shoe repair shop on Thursday?A. He forgot.B. He went to another country.C. He was too busy.D. He knew the shoes would not be ready.( )3. The man was away from his hometown ____.A. until Thursday C. until the next morningC. for about 20 yearsD. for a few days( )4. What did the man do when he returned to his hometown?A. He looked for a new job.B. He bought a new pair of shoes.C. He visited all his friends.D. He returned to the shoemaker.( )5. The man finally found that ____.A. his shoes were still there, but the shoemaker didn’t r epair themB. his shoes were not thereC. the shoemaker repaired the shoesD. the shoemaker lost the shoes阅读理解&完形填空每日一练FridayI like my bike. It brings me a lot of fun. When I was an 1 boy, my father bought it for me. It is my “horse”. I often go to school 2 my bike. I like riding a bike 3 it is very convenient. If I go out by bike, it is 4 to find a place for parking it. Bikes are very cheap, so most people can buy one. There are three people in my family.5 of us has a bike. My parents are teachers in my school. In the morning, Mum, Dad andI each 6 to school. However on a rainy day we walk to school, because the road is bad for riding. I think riding bikes can make us 7 . It not only helps us exercise more but also 8 the air clean. The bike is very important in Chinese people’s life. So riding bikes can help you to 9 more about China and the Chinese people. Now people in the world say China is the country of bikes because there are 10 bikes in China.I hope people all round the world like them.( )1. A. eight years old B. eight year old C. eight-year-old D. eight-years-old( )2. A. by B. on C. from D. in( )3. A. so B. but C. while D. because( )4. A. hard B. late C. happy D. easy( )5. A. Each B. Both C. None D. Some( )6. A. walk B. run C. drive D. ride( )7. A. strange B. busy C. strong D. poor( )8. A. feels B. keeps C. sees D. likes( )9. A. tell B. know C. visit D. ask( )10. A. so many B. so much C. too much D. many tooWhen Mr. David retired(退休), he bought a small house in a village near the sea. He liked it and hoped to live a quiet life in it. But to his surprise, many visitors came to see his house in summer holidays, for it was the most interesting building in the village. From morning to night, there were visitors outside the house. They kept looking into the rooms through the windows and many of them even went into the house. He decided to drive the visitors away. So he put a notice on the window. The notice said，“If you want to satisfy y our curiosity(好奇心),come in and look around. Price: twenty dollars.”Mr. David was sure that the visitors would stop coming, but he was wrong. More and more visitors came and Mr. David had to spend every day showing them around his house. “I came here to ret ire, not to work as a guide(导游)”, he said angrily. In the end,he sold the house and moved away.( )1. Mr. David’s house was that many visitors came to see it.A. so smallB. so quietC. so interestingD. such interesting ( )2. Mr. David put a notice on the window in order .A. to drive the visitors awayB. to satisfy the visitors curiosityC. to let visitors come in and look aroundD. to get some money out of the visitors( )3. The notice made the visitors .A. more interested in his houseB. lost interest in his houseC. angry at the unfair priceD. feel happy about the price( )4. After Mr. David put up the notice .A. the visitors didn’t come any moreB. fewer and fewer visitors came to see his houseC. more and more visitors came for a visitD. no visitor would pay the money for a visit( )5. At last he had to sell his house and move away because .A. he did not like it at allB. he could not work as a guideC. he made enough money and wanted to buy a new expensive houseD. he could not live a quiet life in itI was born in the Tronto, Canada. Life looked bright and was filled with hope for my parents and me. My father and mother were married in 1980, and I was born next year. As I grew into a man, I often looked to my father for advice and support. There were many things about his character that I admired, but like any young boy, I often thought that my father’s ideas were from the past and out of date.I did well as a student and was the first person in my family to graduate from university.I went on to be a university professor and writer, and most people would say that I have had a very successful life. But I know much of my success is because of the lessons that he passed onto me.On Father’s Day, I will look in the mirror and smile. My dad gave me many gifts, including my now bald head (秃顶), and the friendly smile that my friends say I have.Thank you again, dad. I miss you. Happy Father’s Day.( ) 1.This passage should be a(an) _____________.A. noteB. letterC. invitationD. poster( ) 2.What does the underlined phrase “out of date” mean?A.时尚B. 迂腐C. 固执D. 过时( ) 3.From the passage we can know ____________.A. the writer is grateful to his father for what his father has doneB. the writer misses his father very muchC. the writer’s life is bright and full of hopeD. the writer’s father is lovingBHave you ever seen snow? Many people in the world have not. Some countries never have snow; some have only a little on the tops of very high mountains. In the north of England, there is quite a lot of snow every winter, but in the south of England, there is usually little.When a student from a warm country comes to England in autumn for the first time, he feels cold at first. There are often dark clouds, grey sky and cold rain in England in autumn, and most students from warm countries do not like this.But snow is different. Though it is cold, it is also beautiful. Perhaps, after several dark mornings, the student wakes up one day, and there is a lot of light in his room. He thinks “Is it so late?” and jumps out of bed. But no, it is not very late. He looks out of the window and there is the snow on the ground and on the houses and everywhere. The light of his room comes from clean, beautiful snow.( )4. In which part of England is there much snow in winter?A. In the east.B. In the north.C. In the west.D. In the south.( )5. In the autumn of England, we can NOT often see __________.A. grey skyB. dark cloudsC. strong windsD. cold rain ( )6. Why does the student ask himself “Is it so late?”A. Because he has some work to do.B. Because it is bright in the room.C. Because it is really late.D. Because he usually gets up early. ( )7. Which of the following statements is true?A. Every country in the world has snow in winter.B. Foreign students like the weather in England.C. It is often very warm in the autumn of England.D. Many people in the world haven’t seen snow.COne night a man came to our house and told me, “There is a family with eight children. They have nothing to eat for days.”I took some food and went. When I finally came to the family, I saw the ugly face of those little children by hunger. There was no sorrow (悲伤) or sadness in their faces, just the deep pain of hunger.I gave the rice to the mother. She divided(分) it into two, and went out, carry half the rice with her. When she came back, I asked her, “Where did you go?” She gave me this simple answer, “To my neighbours----they are also hungry.”( ) 8. The writer thought poor people were _________.A. luckyB. generousC. uglyD. sad( ) 9. The mother went out to _________.A.give some rice to her neighboursB.look for her childrenC. cook the riceD. buy some rice( ) 10. Which is not true about the story?A. The story happened at night.B. The family was kind and generous.C. The family had nothing to eat because they were lazy.D. As a rule, we have no time for others when we are in trouble.阅读理解&完形填空每日一练2013.5.11 SaturdayWhat does “getting along with your teacher” mean, anyway? “Getting along” means you and your teacher have a relationship that 1 for both of you, and that you both get what you 2 from the relationship. For your teacher, he or she wantsto make 3 you are careful, being respectful and polite, and 4 your best to learn. For you, you 5 a teacher who respects you, answers your questions, and triesto 6 you learn. You can get along with your teacher and learn without being friends with him or her, although it’s 7 if that happens.In every school, kids say some teachers are too 8 or serious, but don’t judge a teacher 9 you are in his or her class and can see for yourself. Most of time, your teacher is on your 10 . And a teacher who’s strict may be someone who 11 to do his or her job well—teaching you the 12 you should learn. It’s also 13 to remember that making mistakes is a 14 of learning. By pointing out your mistakes and helping you 15 them, a teacher is teaching you.1. A. works B. offers C. looks2. A. hate B. agree C. need3. A. right B. sure C. able4. A. trying B. making C. taking5. A. become B. refuse C. want6. A. encourage B. help C. ask7. A. well B. wrong C. nice8. A. brave B. strict C. strange9. A. until B. since C. when10. A. place B. team C. side11. A. expects B. fails C. allows12. A. homework B. subject C. example13. A. successful B. possible C. important14. A. part B. piece C. chance。
八年级上册数学期末综合每日一练1-15
1．如图，BE是某个三角形的高，则这个三角形是（）A．△ABE B．△ABD C．△CBE D．△ABC2．如图，已知∠ABC＝∠DCB，下列结论中，不能得到△ABC≌△DCB的是（）A．AC＝BD B．∠A＝∠D C．AB＝CD D．∠EBC＝∠ECB 3．对于①a﹣2ab＝a（1﹣2b），②（a+2）（a﹣1）＝a2+a﹣2，从左到右的变形，表述正确的是（）A．①是因式分解，②是乘法运算B．①是乘法运算，②是因式分解C．①②都是因式分解D．①②都是乘法运算4．如图，△AOB与△COD中的∠AOB与∠COD是对顶角．（1）如图1，证明：∠A+∠B＝∠C+∠D；（2）如图2，AP，DP分别是∠BAO，∠CDO的平分线，探索∠P，∠B和∠C之间的数量关系并加以证明；（3）如图3，∠BAO与∠CDO的相邻补角平分线交于点P，探索∠P，∠B和∠C之间的数量关系并加以证明．1．如图，在△ABC中，∠A＝52°，∠ABC和∠ACD的平分线交于点A1，得∠A1，∠A1BC 和∠A1CD的平分线交于点A2，得∠A2，同理可得∠A3，则∠A3＝（）度．A．26°B．15°C．10°D．6.5°2．如图，在3×3的正方形网格中，网格线的交点称为格点．已知A，B是两个格点，若点C是图中的格点，且△ABC是等腰三角形，则点C的个数是（）A．4B．8C．10D．123．方程的解为（）A．x＝﹣1B．x＝2C．x＝1D．该方程无解4．如图，Rt△ABC中，∠ABC＝90°，D是AC上一点，BC＝DC，过点D作AC的垂线交AB于点，求证：CE垂直平分BD．1．如图，BP平分∠ABC交CD于点F，DP平分∠ADC交AB于点E，若∠A＝45°，∠P ＝40°，则∠C的度数为（）A．30°B．35°C．40°D．45°2．如果等腰三角形一腰上的高与另一腰的夹角为45°，那么这个等腰三角形的底角为（）A．22°50′B．67.5°C．22°50′或67°50′D．22.5°或67.5°3．若整数a使关于x的不等式组有解，且关于y的分式方程有非负整数解，则满足条件的所有整数a之和是（）A．2B．3C．9D．104．如图，在△ABC中，AD是高，AE、BF是角平分线，它们相交于点O，∠C＝70°．（1）∠AOB的度数为；（2）若∠ABC＝60°，求∠DAE的度数．1．在下列△ABC中，正确画出AC边上的高的图形是（）A．B．C．D．2．规定：在平面直角坐标系中，一个点作“0”变换表示将它向右平移一个单位，一个点作“1”变换表示将它关于x轴作对称点，一个点作“2”变换表示将它关于y轴作对称点．由数字0，1，2组成的序列表示一个点按照上面描述依次连续变换．例如：如图，点A（﹣2，3）按序列“012”作变换，表示点A先向右平移一个单位得到A1（﹣1，3），再将A1（﹣1，3）关于x轴对称得到A2（﹣1，﹣3），再将A2（﹣1，﹣3）关于y轴对称得到A3（1，﹣3）…依次类推．点（1，1）经过“012012012…”100次变换后得到点的坐标为（）（注：“012”算3次变换）A．（2，1）B．（﹣2，1）C．（﹣2，﹣1）D．（﹣1，﹣1）3．因式分解：（1）；（2）（x+2）2+（3x﹣1）（3x+1）﹣10x（x+1）．1．如图，在四边形ABCD中，∠1+∠2+∠3＝320°，则∠D的度数为（）A．160°B．150°C．140°D．130°2．如图，在锐角△ABC中，边AB、AC的垂直平分线交于点P，连结BP，CP．若∠BPC ＝100°，则∠A＝（）A．40°B．50°C．60°D．80°3．若x2﹣mx﹣10＝（x﹣5）（x+n），则n m的值为（）A．﹣6B．8C．D．4．已知，，，（x2+1），，（x﹣y），其中是分式的共有（）A．1个B．2个C．3个D．4个5．如图，在平面直角坐标系中，AC＝CD，已知A（3，0），B（0，3），C（0，5），点D在第一象限内，∠DCA＝90°，AB的延长线与DC的延长线交于点M，AC与BD交于点N．（1）∠OBA的度数为．（2）求点D的坐标．（3）求证：AM＝DN．1．如图，在△ABC中．∠B＝67°，∠C＝33°，AD是△ABC的角平分线，过点D作DF ∥AB交AC于E，则∠ADE的度数为（）A．40°B．45°C．50°D．55°2．如果一个多边形的内角和是外角和的2倍，则这个多边形的边数为（）A．六B．七C．八D．九3．疫情期间，某学校用4000元钱到药店去采购75%的酒精消毒液，经过协商议价，实际每瓶降价20%，结果比用原价多买了200瓶，求原价每瓶多少元？若设原价每瓶x元，则可列出方程为（）A．B．C．D．4．若x2+mx+81是完全平方式，则m的值是（）A．±18B．±9C．9D．185．如图，在△ABC中，∠BAC＝100°，DG、EF分别垂直平分AB，AC，垂足分别为G，F，求∠DAE的度数．1．如图，四边形ABCD中，点M，N分别在AB，BC上，将△BMN沿MN翻折得△FMN，若MF∥AD，FN∥DC，则∠B角度是（）A．50°B．65°C．70°D．80°2．利用图中面积的等量关系可以得到某些数学公式，根据如图能得到的数学公式是（）A．（a+b）（a﹣b）＝a2﹣b2B．（a﹣b）2＝a2﹣2ab+b2C．a（a+b）＝a2+ab D．a（a﹣b）＝a2﹣ab3．如图，△ABC中，AB＝AC．O是△ABC内一点，OD是AB的垂直平分线，OF⊥AC，OD＝OF．（1）当∠DOF＝126°时，求：∠OBC的度数．（2）判断△AOC的形状，并证明．1．如图，D是AB上一点，DF交AC于点E，DE＝FE，FC∥AB，若AB＝7，CF＝4，则BD的长是（）A．5B．4C．3D．22．如图，用不同的代数式表示图中阴影部分的面积，可得等式（）A．（a+b）2＝a2+2ab+b2B．（a﹣b）2＝a2+2ab﹣b2C．（a+b）（a﹣b）＝a2﹣b2D．（a﹣b）2＝a2﹣2ab+b23．如图，在平面直角坐标系中，△ABO的边BO在x轴上，点A坐标（5，12），B（17，0），点C为BO边上一点，且AC＝AO，点P为AB边上一点，且OP⊥AC．（1）求出∠B的度数；（2）试说明OA＝OP；（3）求点P的坐标．1．如图，在△ABC中，∠C＝90°，AC＝8，BC＝15，AB＝17，AD是∠BAC的角平分线，DE⊥AB，垂足为E，则△BDE的周长为（）A．23B．24C．25D．322．（﹣m+1）2的计算结果为（）A．1﹣m2B．1﹣m+m2C．m2+1D．1+m+m23．已知x2﹣ax+16可以写成一个完全平方式，则a可为（）A．4B．±4C．8D．±84．下列计算正确的是（）A．（a2b）2＝a2b2B．（﹣m）7÷（﹣m）5＝m2C．a6÷a2＝a3D．（3xy2）2＝6x2y45．（1）分解因式：4ma2﹣mb2；（2）解方程：．1．如图，在Rt△ABC中，∠ABC＝90°，以AC为边，作△ACD，满足AD＝AC，E为BC 上一点，连接AE，∠CAD＝2∠BAE，连接DE，下列结论中：①∠ADE＝∠ACB；②AC⊥DE；③∠AEB＝∠AED；④DE＝CE+2BE．其中正确的有（）A．①②③B．③④C．①④D．①③④2．关于x的方程x+＝a+的两个解为x1＝a，x2＝，x+＝a+的两个解为x1＝a，x2＝；x+＝a+的两个解为x1＝a，x2＝，则关于x的方程x+＝a+的两个解为（）A．x1＝a，x2＝B．x1＝a，x2＝C．x1＝a，x2＝D．x1＝a，x2＝3．周末，两骑行爱好者甲和乙刚相约从A地沿着相同路线骑行到距离A地20千米的B地，已知甲的速度是乙的速度的1.5倍．（1）若乙先骑行2千米，甲才开始从A地出发，则甲出发24分钟后追上乙，求甲每小时骑行多少千米？（2）若乙先骑行50分钟，甲才开始从A地出发，则甲乙同时到达B地，求甲每小时骑行多少千米？1．如图，Rt△ACB中，∠ACB＝90°，△ABC的角平分线AD、BE相交于点P，过P作PF ⊥AD交BC的延长线于点F，交AC于点H，则下列结论：①∠APB＝135°；②BF＝BA；③PH＝PD；④连接CP，CP平分∠ACB．其中正确的是（）A．1个B．2个C．3个D．4个2．若x2+（k+1）x+1是一个完全平方式，则k的值是（）A．﹣3B．1C．﹣3或1D．±23．将多项式x3﹣2x2+x因式分解正确的是（）A．x（x2﹣2x）B．x（x2﹣2x+1）C．x（x+1）2D．x（x﹣1）2 4．如果把分式中的x，y都扩大3倍，那么分式的值（）A．扩大3倍B．缩小3倍C．不变D．扩大6倍5．△ABC在直角坐标系中的位置如图，其中C点的坐标是（﹣1，1）．（1）若△A1B1C1与△ABC关于y轴对称，请作出△A1B1C1；（2）求△ABC的周长．（3）已知D点坐标（﹣3，﹣2），求△BOD的面积．1．如图，在△ABC中，AB＝AC，点D为线段BC上一动点（不与点B，C重合），连接AD，作∠ADE＝∠B＝40°，DE交线段AC于点E．下列结论：①∠DEC＝∠BDA；②若AD＝DE，则BD＝CE；③当DE⊥AC时，则D为BC中点；④当△ADE为等腰三角形时，∠BAD＝40°．其中正确的有（）个．A．1个B．2个C．3个D．4个2．已知分式有意义，则x的取值范围为（）A．x≠﹣1且x≠3B．x≠3C．x≠﹣1D．x≠﹣1或x≠3 3．某种病毒近似于球体，它的半径约为0.0000000005米，用科学记数法表示为（）A．0.5×10﹣9B．5×10﹣8C．5×10﹣9D．5×10﹣104．如图，平面直角坐标系中，点A的坐标为（0，a），点B的坐标为（b，0），且满足+16+8b+b2＝0．（1）求A、B两点的坐标；（2）若点C是第二象限内一点，且∠BCO＝90°，过点A作AD⊥OC于F，求证：F A ＝CO．1．如图，已知∠DBC＝∠ACB，添加下列一个条件可得△ABC≌△DCB，正确的是（）A．AB＝DC B．∠AEB＝∠DEC C．BE＝CE D．AC＝DB 2．2017年12月15日，北京2022年冬奥会会徽“冬梦”正式发布．以下是参选的会徽设计的一部分图形，其中是轴对称图形的是（）A．B．C．D．3．因式分解：（1）3a2+18ab+27b2；（2）（a2+1）2﹣4a2；（3）x2﹣5x﹣6．4．如图，在△ABC中，AB＝AC，∠BAC＝36°，CD是∠ACB的平分线交AB于点D，（1）求∠ADC的度数；（2）过点A作AE∥BC，交CD的延长交于点E．①求证：△ADE是等腰三角形；②判断：△ACE是否是等腰三角形，请先写出结论，再说明理由．1．如图，DE垂直平分AB，已知AC＝5cm，△ADC的周长为17cm，则BC的长为（）A．7cm B．10cm C．12cm D．22cm2．如图，在△ABC中，AB＝AC，AD⊥BC，垂足为D，点E，F分别为AB，AD上的动点，且S△ABC＝24，AB＝8，则BF+EF的最小值是（）A．3B．6C．9D．123．因式分解：（1）x3﹣25x；（2）9a2（x﹣y）+4b2（y﹣x）；（3）﹣3a3m+6a2m﹣3am．4．已知（a x）y＝a6，（a x）2÷a y＝a3．（1）求xy和2x﹣y的值；（2）求4x2+y2的值．八年级上册数学期末综合每日一练151．计算﹣的结果是（）A．B．C．a2﹣b2D．12．（1）先化简，当x＝2时，原式＝．（2）分式方程的解为x＝．（答案写小数）3．（1）解方程：﹣1＝；（2）化简：（a+2b）（a﹣b）+（a2b2﹣2ab3）÷（﹣ab）．4．如图①，△ABC中，∠ABC、∠ACB的平分线交于O点，过O点作BC平行线交AB、AC于E、F．（1）请写出图①中线段EO和BE的大小关系：．（2）请写出图①中线段EF与BE、CF间的关系：．（3）如图②，若∠ABC的平分线与△ABC的外角∠ACG平分线交于O，过点O作BC 的平行线交AB于E，交AC于F．请写出EF与BE、CF的关系，并说明理由．。
人教版八年级上册第一学期数学期末复习每日一练(1-5)
八年级上数学期末复习每日一练一一、选择题(每题3分，共24分)1. 下面图案中是轴对称图形的有( )A 1个 B. 2个 C. 3个 D. 4个 2. 在ABC ∆中，70,55AB ∠=︒∠=︒，则ABC ∆是( )A.钝角三角形；B.等腰三角形；C.等边三角形；D.等腰直角三角形 3. 在ABC ∆和A B C '''∆中，,AB A B AC A C ''''==，高AD A D ''=，则C ∠和C '∠的关系是( )A.相等；B.互补；C.相等或互补；D.以上都不对4. 如图，在ABC ∆中，,AB AC D =是BC 中点，下列结论中不正确的是( ) A. B C ∠=∠； B. AD BC ⊥； C. AD 平分BAC ∠； D. 2AB BD =5. 由下列条件不能判定ABC ∆为直角三角形的是( )A. A B C ∠+∠=∠B. ::1:3:2A B C ∠∠∠=C. 2()()b c b c a +-= D. 111,,345a b c === 6. 在一个直角三角形中，若斜边的长是13，一条直角边的长为12，那么这个直角三角形 的面积是( )A .30 B. 40 C. 50 D. 60 7. 下列说法中正确的是( )A.两个直角三角形全等B.两个等腰三角形全等C.两个等边三角形全等D.两条直角边对应相等的直角三角形全等8. 已知正方形①、②在直线上，正方形③如图放置，若正方形①、②的面积分别为81 cm 2和144 cm 2，则正方形③的边长为( )A. 225 cm ；B. 63 cm ；C. 50 cm ；D. 15 cm二、填空题(每题3分，共30分)9. 如果等腰三角形的底角是50°，那么这个三角形的顶角的度数是 . 10. 直角三角形的两条直角边分别是9和12，则斜边是 .11. 如图，在Rt ABC ∆中，90,ACB D ∠=︒为斜边AB 的中点，AC =6 cm,BC =8 cm ，则CD 的长为 cm.12. 如图，在ABC ∆中，,AB AC D =为BC 中点，35BAD ∠=︒，则C ∠的度数 为 . 13. 已知等腰三角形的周长为15cm ，其中一边长为7 cm ，则底边长为 .14. 甲、乙两人同时从同一地点出发，甲往北偏东60°的方向走了12 km ，乙往南偏东30° 的向走了5 km ，这时甲、乙两人相距 km15. 如图，ABC ∆中，90,C A B ∠=︒的垂直平分线交BC 于点D ，如果20B ∠=︒，则C A D∠= . 16. 如图，Rt ABC ∆中，90,8,3C AC BC ∠=︒==, ,,AE AC P Q ⊥分别是,AC AE 上 动点，且PQ AB =，当AP = 时，才能使ABC ∆和PQA ∆全等.17. 如图，有一块直角三角形纸片，两直角边AC =6 cm, BC =8 cm ，现将直角边AC 沿着直线AD 折叠，使它落在斜边AB 上，且与AE 重合，则CD 的长为 cm.16题18. 如图，90MON ∠=︒，已知ABC ∆中，5,6AC BC AB ===,ABC ∆的顶点,A B 分别在边,OM ON 上，当点B 在边ON 上运动时，点A 随之在边OM 上运动，ABC ∆的形状保持不变，在运动过程中，点C 到点O 的最大距离为 .2019—2020学年第一学期八年级数学期末复习每日一练二一、选择题(本大题共10小题，每小题3分，共30分)1. 下列四个数中，最大的一个数是（ ）A.2D. 2- 2. 下列图形中，是轴对称图形的是（ ）A.①②B.②③C.①④D.③④ 3. 下列说法正确的是（ ）A.81-的平方根是9±B. 7C.127的立方根是13± D. 21-（）的立方根是1-4. 一次函数32y x =-的图像与y 轴的交点坐标是（ ）A. 2(,0)3-B.2(,0)3C.(0,2)-D.(0,2)5. 若点(21,3)M m m -+在第二象限，则m 取值范围是（ ）A.12m >B.3m <-C.132m -<<D.12m <6. 一次函数y kx b =+的图象如图所示，则当0y ≥时，x 的取值范围是（ ） A.2x ≥- B.2x ≤- C.1x ≥- D.1x ≤-7. 如图，每个小正方形的边长为1，A 、B 、C 是小正方形的顶点，则ABC ∠的度数为（ ） A. 90︒ B. 60︒ C.45︒ D. 30︒ 8. 如图，已知AB AD =，那么添加下列一个条件后，仍无法判定．．．．．ABC ADC ≅V V 的是（ ）A.CB CD = ； B.BAC DAC ∠=∠；C.BAC DCA ∠=∠； D.90B D ∠=∠=︒9. 如图，在ABC V 中，90C ∠=︒，4AC =，3BC =，将ABC V 绕点A 逆时针旋转，使点C 落在线段AB 上的点E 处，点B 落在点D 处，则B 、D 两点间的距离为（ ）B.C.D.10. 如图，正方形ABCD 的边长为2cm ，动点P 从点A 出 发，在正方形的边上沿A B C →→的方向运动到点C 停止， 设点P 的运动路程为()x cm ， 在下列图象中，能表示ADP V的面积2()y cm 关于()x cm 的函数关系的图象是（ ）线密班级 姓名 学号 试场号封二、填空题(本大题共8小题，每小题3分，共24分，请将答案填在答题卡相应的位置上)11. = .12. 已知地球上海洋面积约为3610000002km ，则361000000用科学记数法可以表示为 .13. 在平面直角坐标系中点(2,3)P -关于x 轴的对称点是 .14. 在一次函数(1)5y k x =-+中，y 随x 的增大而增大，则k 的取值范围是 .15. 如图，在ABC V 中，点D 、E 分别是边AC 、BC 上的点，若ADB EDB EDC ≅≅V V V ，10AB cm =，则BC = cm .16. 如图，在ABC V 中，A B A C =，50A ∠=︒，CD AB ⊥于D ，则DCB ∠等于 .17. 如图，OP 平分AOB ∠，15AOP ∠=︒，//PC OA ，4PC =，点D 是射线OA 上的一个动点，则PD 的最小值为 .18. 如图，在平面直角坐标系中，已知直线334y x =-+与x 轴、y 轴分别交于A 、B 两点，点(0,)C n 是y 轴上一点，将ABC V 沿直线AC 折叠，使得点B 恰好落在轴x 上，则点C 的坐标为( ， ).2019—2020学年第一学期八年级数学期末复习每日一练三一．选择题. （本大题共10小题，每小题3分，共30分）1. 下列图形中，轴对称图形的个数为A ．1个B ．2 个C ．3个D ．4个2.x 的取值范围是A ．4x >B ．4x ≠C ．4x ≤D ．4x ≥ 3.下列给出的三条线段的长，能组成直角三角形的是A ．1 、 2 、3B ．2 、 3、 4C ．5、 7 、 9D ．5、 12、 134.A B ．5C ．D 5.下列等式中正确的是A.3=- B. 22=- C.2=- D.3=-6. 如图，数轴上点A 对应的数是1，点B 对应的数是2，BC ⊥AB ，垂足为B ，且BC=1,以A 为圆心，AC 为半径画弧，交数轴于点D ，则点D 表示的数为A ．1.4BC 1+D ．2.47．如图，正五边形ABCDE 放入某平面直角坐标系后，若顶点A ，B ，C ，D 的坐标分别是（0，a ），（﹣3，2），（b ，m ），（c ，m ），则点E 的坐标是 A ．（2，﹣3） B ．（2，3）C ．（3，2）D ．（3，﹣2）8.如图，点E 、F 在AC 上，AD=BC ，AD//BC ，则添加下列哪一个条件后，仍无法判定△ADF ≌△CBE 的是A.DF=BEB.∠D=∠BC.AE=CFD.DF//BE9. 在同一直角坐标系内，一次函数y kx b =+与2y kx b =-的图象分别为直线为12,l l ，则下列图像中可能正确的是（ ）A B C D 10.已知点A (1,3)、B (3,1)-,点M 在x 轴上，当AM BM -最大时，点M 的坐标为 A ．(2,0) B ．(2.5,0) C ．(4,0) D ．(4.5,0)二．填空题. ( 本大题共8小题，每小题3分，共24分)11.圆周率 3.1415926π≈,用四舍五入法把π精确到千分位，得到的近似值是_______.12.已知点(,)P a b 在一次函数21y x =-的图像上，则21__________a b -+= 13.如图，已知△ABC ≌△DCB ，∠ABC=65°，∠ACB=30°，则∠ACD=______° 14.已知一个球体的体积为3288cm ，则该球体的半径为________cm.（注：球体体积公式V球体=343r π，r 为球体的半径.）第13题图 第16题图 第17题图 15.已知等边三角形的边长为2，则其面积等于__________.16.如图，已知一次函数y ax b =+的图像为直线l ，则关于x 的不等式0ax b +<的解集为__ 。
2022届八年级物理第十七章欧姆定律经典大题例题
(每日一练)2022届八年级物理第十七章欧姆定律经典大题例题单选题1、如图所示的是琳琳设计的电路图，当她闭合开关S1、S2，两个电流表（实验室学生用）的指针在同一位置，则下列判断正确的是（）A．两个电流表的示数相等B．A1测的是通过L1的电流C．两灯L1与L2电阻之比为1：4D．两灯L1与L2电阻之比为4：1答案：C解析：AB．由电路图可知，闭合开关S1和S2后，两灯泡并联，电流表A1测干路电流，电流表A2测L2支路的电流，由于并联电路干路中的电流等于各支路中的电流之和，所以A1的示数大于A2的示数，故AB错误；CD．实验室学生用电流表，有0~3A和0~0.6A两个量程，两个电流表的指针在同一位置，且A1的示数大于A2的示数，所以A1使用的是0~3A量程，A2使用的是0~0.6A量程，由于两个电流表的指针在同一位置，那么两电流表指针所在位置的刻度数是相同的，设为n，电流表A1的每一分度值是0.1A，电流表A2的每一分度值是0.02A，那么电流表A1的读数是I=0.1A×n，电流表A2的读数是I2=0.02A×n，两电流表的读数比值是I I2=0.1A×n0.02A×n=5即I=5I2，则流过灯泡L1的电流大小是I1=I−I2=5I2−I2=4I2两灯电流关系是I1=4I2；并联电路中各支路两端电压与电源电压都相等，由欧姆定律的推导式有U=I1R1=I2R2两灯L1与L2电阻之比是R1 R2=I2I1=I24I2=14两灯L1与L2电阻之比为1：4，故C正确，D错误。
故选C。
2、洋洋设计一个自动测高仪，各选项中的的四个电路，R是定值电阻，R′是滑动变阻器，其中能够实现身高越高，电压表示数越大的电路是（）A．B．C．D．答案：C解析：A．电压表测量的是电源电压，示数不变，故A不符合题意；B．电压表串联在干路中，无论怎么移动滑动变阻器，电压表示数都约等于电源电压，故B不符合题意；C．电压表测量的是R′的电压，因为R′和R串联，身高越高，R′阻值越大分压越多，电压表示数越大，故C符合题意；D．电压表测量的是R的电压，身高越高R′越大，R分压越小，故D不符合题意。
人教版八年级上册数学每日一练14-20
1．已知，如图，△ABC中，AB＝AC，∠A＝120°，BC＝18cm，AB的垂直平分线交BC于点M，交AB于点E，AC的垂直平分线交BC于点N，交AB于点F，则MN的长为（）A．18cm B．12cm C．6cm D．3cm2．如图，在等腰△ABC中，CA＝CB，∠C＝50°，DE⊥AC，FD⊥AB，则∠EDF＝．3．如图，AB＝AC，AE＝ED＝DB＝BC，求∠A的度数．1．如图，P为△ABC内一点，过点P的线段MN分别交AB、BC于点M、N，且M、N分别在P A、PC的中垂线上．若∠ABC＝80°，则∠APC的度数为（）A．120°B．125°C．130°D．135°2．如图，DE是△ABC的边AB的垂直平分线，垂足为点D，DE交AC于点E，且AC＝7，△BEC的周长为11，则BC的长为．3．计算：△ABC在平面直角坐标系xOy中的位置如图所示．（1）作△ABC关于y轴成轴对称的△A1B1C1，并写出A1、B1、C1的坐标；（2）在y轴上有一点P，使P A+PB的值最小，请在坐标系中标出点P的位置．1．已知等腰三角形一腰上的高线与另一腰的夹角为60°，那么这个等腰三角形的顶角等于（）A．15°或75°B．30°C．150°D．150°或30°2．如图，∠AOB＝30°，M、N分别是射线OA、OB上的动点，OP平分∠AOB，且OP＝6cm，则△PMN的周长的最小值为cm．3．如图，在△ABC中，∠BAC＝∠ACB，点D是BC边上一点，且满足∠B＝∠1，CE平分∠ACB交AD于点E．（1）若∠ADC＝80°，求∠2的度数；（2）过点E作EF∥AB，交BD于点F，请说明∠FEC＝3∠3．八年级上册数学每日一练171．如图，在△ABC中，∠B＝∠C，点D在BC边上，点E在AC上，∠ADE＝∠AED，若∠BAD＝40°，则∠CDE的度数为（）A．10°B．15°C．20°D．25°2．如图，已知△ABC与△ABD关于AB所在的直线对称，延长AD交CB的延长线于点E，若AC+BC＝AE，且∠C＝40°，则∠E的度数为．3．如图，在△ABC中，∠BAC＝105°，MP垂直平分AB，分别交AB、BC于点M、P，NQ垂直平分AC，分别交AC．BC于点N、Q，连接AP、AQ，求∠P AQ的度数．八年级上册数学每日一练181．如图，在△ABC中，AB＝AC，点D为AB边上一点，且AD＝CD＝BC，则∠A的度数为（）A．38°B．36°C．32°D．30°2．如图，在△ABC中，DE垂直平分AC，交AC边于点E，交BC边于点D，若AE＝3，△ABD的周长为14，则△ABC的周长为．3．如图，BD是△ABC的角平分线，DE∥BC，交AB于点E．（1）求证：∠EBD＝∠EDB．（2）当AB＝AC时，请判断CD与ED的大小关系，并说明理由．八年级上册数学每日一练191．如图，∠AOB＝30°，点P是∠AOB内的定点且OP＝4，若点M，N分别是射线OA，OB上异于点O的动点，则△PMN周长的最小值是（）A．B．C．4D．82．若等腰三角形一腰上的中线将它的周长分成了15cm和18cm两部分，则它的腰长为cm．3．如果等腰三角形的一个内角等于40°，则它两底角的平分线所夹的钝角为．4．如图，在△ABC中，边AB的垂直平分线OM与边AC的垂直平分线ON交于点O，这两条垂直平分线分别交BC于点D、E．已知△ADE的周长为13cm．分别连接OA、OB、OC，若△OBC的周长为27cm，则OA的长为cm．5．下列说法正确的个数有（）①有两组边对应相等，一组角对应相等的两个三角形全等；②垂直于同一条直线的两直线平行；③三角形的中线把三角形的面积平分；④等腰三角形高所在的直线是对称轴．A．1个B．2个C．3个D．4个八年级上册数学每日一练201．如图，在△ABC中，边AB，AC的垂直平分线交于点P，连接AP，BP，CP，若∠BAC ＝50°，则∠BPC＝°．2．如图，在Rt△ABC中，∠B＝90°，AC＝60cm，∠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（0＜t≤15）．过点D作DF⊥BC于点F，连接DE，EF．（1）求证：AE＝DF；（2）当t为何值时，△DEF为直角三角形？请说明理由．。
八年级数学上学期每日一题1试题
第1题图 2八年级数学每日一题〔亲爱的同学们，每天练一练，越来越聪明〕班级：姓名：1. (1) 如图1,在正方形ABCD 中,点E ,F 分别在边BC ,CD 上,AE ,BF 交于点O ,∠AOF ＝90°.求证：BE ＝CF .(2) 如图2,在正方形ABCD 中,点E ,H ,F ,G 分别在边AB ,BC ,CD ,DA 上,EF ,GH 交于点O ,∠FOH ＝90°, EF ＝4.求GH 的长.(3) 点E ,H ,F ,G 分别在矩形ABCD 的边AB ,BC ,CD ,DA 上，EF ,GH 交于点O , ∠FOH ＝90°,EF ＝4. 直接写出以下两题之答案：①如图3,矩形ABCD 由2个全等的正方形组成,那么 GH=___________；②如图4,矩形ABCD 由n 个全等的正方形组成,那么 GH=___________；(用n 的代数式表示).第1题图1EDCBAO2.如图，在ABC △中，D 是BC 边上的一点，E 是AD 的中点，过点A 作BC 的平行线交BE 的延长线于F ，且AF DC =，连接CF ．(1)试说明：D 是BC 的中点；(2)假设AB ＝13，BC ＝10，AD=12,试猜想四边形ADCF 的形状，并说明理由．3.〔结果中保存π〕〔1〕操作：如图1，在线段AB 所在的直线上取一点O 〔O 点在线段外〕，将线段AB 绕点O 旋转一周，所得到的图形是个圆环〔如图2〕，此圆环的面积就是线段AB 所扫过的面积，AB=2，OA=1，那么线段AB 扫过的面积为 ．BA FCED〔2〕如图3，在Rt △ABC 中，∠C =90°，∠B=30°，AC=2，假设将△AB C 绕点A 旋转一周，那么边．BC ．．扫过的图形为 ，面积为 ． 〔3〕假设将图3中的Rt △ABC 绕点C 旋转一周，那么边．A ．B ．扫过的图形是什么？面积为多少？4.如图，等腰梯形ABCD 中，AD ∥BC ，AB=CD ，AD=10cm ，BC=30cm ，动点P 从点A 开场沿AD 边向点D 以每秒1cm 的速度运动，同时动点Q 从点C 开场沿CB 边向点B 以每秒3cm 的速度运动，当其中一点到达端点时，另一点也随之停顿运动，设运动时间是为t 秒． 〔1〕t 为何值时，四边形ABQP 是平行四边形？〔2〕四边形ABQP 能成为等腰梯形吗？假如能，求出t 的值；假如不能，请说明理由．图1图2图3B A O30CBA2OF E D CBA5.如图，四边形ABCD 中，AB=CD ，M 、N 分别是AD 、BC 的中点，延长BA 、NM 、CD 分别交于点E 、F 。
人教版2022年八年级物理第十五章电流和电路经典知识题库
(每日一练)人教版2022年八年级物理第十五章电流和电路经典知识题库单选题1、两只规格相同的灯泡按下图方式连接，将开关S1和S2闭合，则（）A．两灯泡是串联的B．电流表A2测灯泡L2的电流C．电流表A1的示数是A2的两倍D．断开S2后，灯泡L1的亮度变大答案：C解析：ABC．由图可知，两个灯泡并联，电流表A2测通过灯泡L1的电流，电流表A1测量干路中的电流，两个灯泡规格相同，通过两个灯泡的电流相等，由并联电路电流的规律可知干路中的电流是支路中的电流的2倍，所以电流表A1的示数是A2的两倍，故C符合题意，AB不符合题意；D．断开S2后，为L1的简单电路，灯泡L1两端的电压等于电源电压，两灯并联时，L1两端的电压也等于电源电压，所以灯泡L1的亮度不变，故D不符合题意。
故选C。
2、疫情期间，各个单位都加强了门卫保安工作｡凡是内部车辆均可通过感应，自动打开门禁系统进入；外来车辆，司机需要经过测温､核查､登记后，由保安人员手动控制，开门进人由此可知，该门禁系统的控制电路可能是A．B．C．D．答案：A解析：小区内部车辆门禁系统可以自动识别将门打开，外部车辆需要门卫人员按动按钮才能将门打开，若将门禁系统看做一个自动开关，按钮看做一个手动开关，则两个开关单独都能打开大门，即两开关并联后再与电动机串联，只有A正确。
故选A。
3、有一款“空调扇”既能送常温风，又能送凉风。
小明了解到其内部有两个电动机，其中电动机M1，驱动扇叶送风，M2驱动机内水循环使所送的风成为“凉风”，此款风扇不会只有水循环而不送风。
小明设计的电路图，符合要求的是()A．B．C．D．答案：C解析：A．开关S1闭合，电动机M1和M2串联同时工作；S1、S2都闭合，电动机M1被短路不能工作，故A不合题意；B．开关S1闭合，电动机M1工作，驱动扇叶送风；S2闭合，电动机M2工作驱动机内水循环，水循环和送风互不影响，故B不合题意；C．开关S1闭合，电动机M1工作，驱动扇叶送风；再闭合开关S2，电动机M2工作，驱动机内水循环，使所送的风成为“凉风”；若S1断开，无论S2是否闭合，电动机M2都不能工作，故C符合题意；D．闭合开关S1，电动机M2工作，驱动机内水循环；再闭合开关S1，电动机M1工作，驱动扇叶送风，故D不合题意。
人教版2022年八年级物理第三章物态变化易错题集锦
(每日一练)人教版2022年八年级物理第三章物态变化易错题集锦单选题1、口罩成为常态防疫“神器”，戴眼镜的人们常因口罩佩戴出现镜片模糊的情况，这是液化现象。
下列实例中与它物态变化相同的是（）A．初春，冰雪消融B．夏天，清晨草叶或树叶上形成露珠C．深秋，屋顶的瓦上结了一层霜D．冬天，室外冰冻的衣服变干了答案：B解析：A．冰雪消融是固态变成液态，是熔化过程，故A不符合题意；B．露珠是空气中的水蒸气遇冷液化而成的，故B符合题意；C．霜是气态变成固态的凝华过程，故C不符合题意；D．冰冻的衣服变干是固态直接变成气态的升华过程，故D不符合题意。
故选B。
2、下列物体中属于晶体的是（）A．橡胶B．沥青C．冰块D．石蜡答案：C解析：晶体由固定的熔点，晶体在熔化过程中吸收热量温度不变，常见的晶体有冰、海波、各种金属；非晶体没有固定的熔点，非晶体在熔化过程中温度升高，常见的非晶体有橡胶、石蜡、沥青、玻璃等。
故选C。
3、下列措施中，能使蒸发变快的是（）A．给盛有水的杯子盖好杯盖B．用电热吹风机吹湿头发C．把蔬菜放入塑料袋内保存D．把水果放入冰箱冷藏室内保存答案：B解析：ACD．给盛有水的杯子盖好杯盖、把蔬菜放入塑料袋内保存、把水果放入冰箱冷藏室内保存等都是减缓水分蒸发的方法，故ACD不符合题意；B．能使蒸发变快的方法有：提高液体温度、增加液体表面的空气流速和增加液体表面积等等，用电热吹风机吹湿头发，能够使水分蒸发加快，故B符合题意。
故选B。
4、一位粗心的护士忘了甩体温计，就给病人测体温，测出示数为 37.8℃，则病人的体温不可能是（）A．37.8℃B．37.5℃C．38.2℃D．36.5℃答案：C解析：由于体温计的特殊构造，即液泡上方有一很细的缩口，在离开人体读数时，体温计液注不会下降，护士忘了甩体温计，就给病人测体温，测出示数为37.8℃，病人的体温可能小于或等于37.8℃，不可能是38.2℃。
故选C。
5、冷链储运中常用一种装有制冷装置的冷藏车，用于运输冷冻食品和疫苗药品等，制冷装置通过液态制冷剂汽化将车的“热”搬运到外面，实现制冷。
初二语文练习题一题一码
初二语文练习题一题一码考察范围：阅读理解阅读下面的短文，根据短文内容回答问题。
1. 小明的家离学校有一里地，每天步行上下学。
一天，他爸爸给他买了一辆新自行车，于是他自行车骑着就去上学了。
他发现，骑自行车只需要9分钟，而步行需要30分钟。
从这个故事可以看出，自行车在上学路上的优势是什么？答案：省时。
2. 小明骑自行车上学需要时间太短，他决定使用多余的时间来为自己提供额外的锻炼。
于是他决定每天早上出门之前在家附近的公园骑行15分钟，这是因为：答案：他希望锻炼身体。
3. 骑自行车需要掌握一些规则，下面哪项规则是正确的？A. 骑自行车时可以不穿头盔。
B. 骑自行车时应该随意变换方向。
C. 骑自行车应遵守交通规则。
答案：C. 骑自行车应遵守交通规则。
4. 自行车的发明对人们的生活产生了积极的影响，下面哪种说法是错误的？A. 自行车可以减少交通拥堵。
B. 自行车可以减少空气污染。
C. 自行车可以缓解城市的工作压力。
答案：C. 自行车可以缓解城市的工作压力。
5. 小红去年暑假骑自行车环游了全国，她觉得这是一次难以忘怀的经历。
以下哪些选择是她可能得到的好处？A. 了解了许多不同的文化和风景。
B. 锻炼了身体，增强了体力。
C. 提高了自己的地理知识。
D. 节约了旅行的费用。
答案：A. 了解了许多不同的文化和风景。
B. 锻炼了身体，增强了体力。
C. 提高了自己的地理知识。
D. 节约了旅行的费用。
6. 骑自行车的好处是什么？答案：省时、锻炼身体、减少交通拥堵、减少空气污染、节约旅行费用、了解不同的文化和风景、提高地理知识。
7. 骑自行车需要遵守的规则是什么？答案：骑自行车应遵守交通规则。
通过以上阅读短文和问题，我们了解到骑自行车的好处以及需要遵守的规则。
骑自行车可以省时，并且锻炼身体，有利于身体健康。
同时，骑自行车还可以减少交通拥堵和空气污染。
自行车的发明对人们的生活产生了积极的影响。
此外，骑自行车还可以节约旅行费用，了解不同的文化和风景，提高地理知识。
(文末附答案)人教版2022年八年级物理第六章质量与密度考点题型与解题方法
(每日一练)(文末附答案)人教版2022年八年级物理第六章质量与密度考点题型与解题方法单选题，则瓶内剩余氧气的密度是（）1、某钢瓶内所装氧气的密度为12kg/m3，若在某天的气焊中用去其质量的34A．12kg/m3B．9kg/m3C．6kg/m3D．3kg/m32、将质量相等的水、盐水和食用油分别装在三个完全相同的容器中，密度关系为ρ盐水>ρ水>ρ食用油，则甲、乙、丙三个容器依次分别装的是（）A．食用油、盐水、水B．盐水、水、食用油C．盐水、食用油、水D．水、盐水、食用油3、下列关于质量的说法中正确的是（）A．水结成冰后质量变大了B．同一本物理书在如东和上海质量是一样的C．1kg的棉花比1kg的铁块质量小D．将铁块压成铁饼，质量减小了4、密封在钢瓶中的氧气，使用一段时间后，关于瓶内氧气的质量、体积、密度的变化下列说法正确的是（）A．质量变小，体积变大，密度变小B．质量变小，体积变小，密度变大C．质量变小，体积变小，密度不变D．质量变小，体积不变，密度变小5、分别由不同物质a、b、c组成的三个实心体，它们的体积和质量的关系如图所示，由图可知下列说法正确的是（）A．a物质的密度最大B．b物质的密度是1.0kg/m3C．c物质的密度是a的4倍D．c的密度与它的质量、体积有关6、质量为3千克的水结成冰，已知冰的密度为0.9×103千克/米3，则（）A．冰的体积小于水的体积B．冰的体积大于水的体积C．冰的质量小于水的质量D．冰的质量大于水的质量7、如图所示，甲、乙为两个均匀实心正方体，它们的质量相等。
若在两个正方体的上部，沿水平方向分别截去相同高度的部分（甲乙都不截完），则甲、乙剩余部分的密度大小ρ甲、ρ乙和质量大小m甲、m乙的关系是（）A．ρ甲>ρ乙，m甲=m乙B．ρ甲<ρ乙，m甲<m乙C．ρ甲>ρ乙，m甲>m乙D．ρ甲<ρ乙，m甲>m乙多选题8、我国研制的“全碳气凝胶”是目前世界上密度最小固态材料，其密度仅为0.16 kg/m3，则（）A．该材料体积越大，密度越大B．1 m3的该材料质量为0.16 kgC．该材料制成的物品带到太空，质量不变D．该材料适合做打桩用的重锤9、下列测量方案中，合理的有（）A．测小铁块密度：用天平测质量后，再用装有适量水的量筒测体积B．测小砖块密度：用天平测质量后，再用装有适量水的量筒测体积C．测正方体小木块密度：用天平测质量后，再用刻度尺测边长并计算体积D．测比赛用铅球密度：用天平测质量后，再用装有适量水的量筒测体积10、小兰同学周末在荆州关公义园游玩时，拾到一块彩色的小石块。
人教版2022年八年级物理第十五章电流和电路解题方法技巧
(每日一练)人教版2022年八年级物理第十五章电流和电路解题方法技巧单选题1、物理课上老师做摩擦起电实验时，发现橡胶棒几乎不能吸引小纸屑，用验电器验电时箔片张开角度也不明显，后来老师戴上橡胶手套重做一次实验，发现用毛皮摩擦过的橡胶棒能吸引很多小纸屑，与验电器接触，验电器的箔片张角也很大，以下相关说法中正确的是（）A．摩擦起电的实质是带正电的质子发生了转移B．橡胶棒与验电器接触瞬间，电流方向为橡胶棒到验电器C．验电器的原理是异种电荷相互吸引D．带上橡胶手套是因为橡胶是绝缘体，可阻止电荷从橡胶棒导入人体答案：D解析：A．摩擦起电不是创造了电，而是电子从一个物体转移到另一个物体，摩擦起电的实质是电子的转移，故A错误；B．正电荷定向移动的方向为电流的方向，电流的方向与负电荷定向移动的方向相反。
橡胶棒带负电，橡胶棒与验电器接触瞬间，电子从橡胶棒流向验电器，电流方向从验电器流向橡胶棒，故B错误；C．验电器的原理是同种电荷相互排斥，两个金属箔片张开，故C错误；D．一开始橡胶棒上的电荷会通过人体转移到大地，老师戴上橡胶手套后，因为橡胶手套是绝缘体，可阻止电荷从橡胶棒导入人体，故D正确。
故选D。
2、有甲、乙、两三个轻质小球，甲球带正电。
将甲与乙、丙靠近时，他们相互作用的情况如图所示。
则下列判断正确的是（）A．乙球可能带负电，丙球一定带正电B．乙球一定不带电，两球可能带负电C．乙球一定带负电，丙球可能带正电D．乙球可能不带电，丙球一定带负电答案：A解析：电荷的相互作用规律：同种电荷相互排斥，异种电荷相互吸引。
甲球带正电，由图可知，与丙球在相互排斥，则丙球一定带正电；甲球与乙球相互吸引，又由于带电体具有吸引轻小物质的性质，则乙球可能带负电或不带电，故BCD错误，A正确。
故选A。
3、如图所示，小明用与丝绸摩擦过的玻璃棒接触不带电的验电器的金属球，观察到验电器的金属箔片张开。
下列说法正确的是（）A．用丝绸摩擦过的玻璃棒得到电子带上负电B．金属箔片张开是由于两金属箔片带正电荷而互相排斥C．金属箔片张开的瞬间，玻璃棒上的正电荷移动到金属箔片上D．金属箔片张开的瞬间，产生的电流方向是从金属箔片流向玻璃棒答案：B解析：A．用丝绸摩擦过的玻璃棒失去电子带正电，故A错误；B．玻璃棒带正电，那么验电器的金属箔片也带正电，同种电荷相互排斥，金属箔片张开，故B正确；CD．用丝绸摩擦过的玻璃棒带正电，接触不带电的验电器上的金属球后，部分电子由金属球转移到玻璃棒上，不是正电荷移动，我们规定正电荷定向移动的方向为电流方向，电子带负电，故瞬间电流的方向是从玻璃棒到验电器，故CD错误。
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1. We need some more____. Can you go and get some, please?
A. potato
B. potatos
C. potatoes
D. potatoe
2. -Would you like___tea?
-No, thanks. I have drunk two____.
A. any, bottles of orange
B. some, bottles of orange
C. many, bottles of oranges
D. few, bottle of oranges
3. My hair is longer than _______.
A. my sister
B. Kate
C. my brother’s
D.Lucys’
4. Who has ______ apples now, Jim, Lily or Lucy?
A. much
B. biggest
C. better
D. the most
5.—Do you like western food?
— No. The food of our country is ______ that of western countries.
A. rather good than
B. much better than
C. more better than
D. not so good as
6. The harder we work, the ______ result we will get.（2005年大连）
A. faster
B. fewer
C. better
D. the cheapest
7. There are two windows in the room. They ____ face south.
A. all
B. both
C. every
D. either
8. He has four brothers. One is in Beijing, but ____ are in Nanjing.
A. another
B. other
C. the other
D. the others
9. He was doing some washing ____.
A. at eight yesterday morning
B. yesterday morning eight
C. yesterday morning at eight
D. by eight yesterday morning
10. Jenny was born .
A. on July 10, 1987
B. in July 10, 1987
C. in 1987, July 10
D. on 1987, July 10
11.It’s ______ now, let’s hurry.
A. half passed six
B. thirty passed six
C. half past six
D. half to seven
12. We won't go to the cinema next Saturday. They won't____.
A. too
B. also
C. neither
D. either
13. He is ___ tired that he can't go any farther.
A. so
B. such
C. very
D. too
14. They have moved away from Beijing. They don't live there____.
A. any longer
B. once more
C. either
D. again
15. That place is not interesting at all, ____of us wants to go there.
A. Neither
B. Both
C. All
D. Some
It was five in the afternoon. A bus 1 a small town. Mrs Morison got off and went in a restaurant by the road, with a small beautiful dog, she was travelling in 2 , she looked for her dog at noon and missed her lunch. So she was 3 now and wanted to have something there.
The waiter received the visitor 4 . But he knew little English and the woman couldn’t speak French. They talked for a while 5 couldn’t understand each other. She had to point to her 6 and then slapped （拍）the dog’s belly （肚子）. The waiter seemed to know 7 she wanted and carried the dog into the kitchen.
About half an hour some dishes were brought to the woman. They were all 8 and she was pleased with them. After she paid for her bill. She didn’t leave she waited for a while and said 9 to the waiter and they began to quarrel （争吵）. Just at that moment the manager came back. He talked with the woman and then with the waiter. At last he understood. The English woman told the waiter to 10 her dog, but he thought she told him to cook it for her!
( )1. A. left B. stopped in C. went out of D. went through
( )2. A. England B. America C. Germany D. France
( )3. A. asleep B. awake C. hungry D. thirsty
( )4. A. warmly B. coldly C. angrily D. quietly
( )5. A. and B. yet C. but D. for
( )6. A. mouth B. nose C. face D. head
( )7. A. how B. when C. where D. what
( )8. A. terrible B. delicious C. bad D. poor
( )9. A. everything B. nothing C. something D. anything
( )10. A. kill B. feed C. hurt D. keep
答案：BDCAC ADBCB。