练习题答案
练习题D答案
练习四一、填空题（每空1分）1、氨在血液中的主要运输形式是（谷氨酰胺）和（丙氨酸）。
2、可以编码相同氨基酸的密码子称为（同义）密码子。
3、参与DNA切除修复的酶有（DNA聚合酶Ⅰ）、（DNA聚合酶Ⅱ）、（DNA连接酶）。
4、遗传密码的特点有连续性、（方向性）、（简并性）、（变偶性）、（通用性）以及有起始密码和终止密码。
5、酪氨酸tRNA反密码子是5'－GUA－3'，它能辨认mRNA上的相应密码子是（5'－UAC －3' ）。
6、假尿嘧啶核苷的糖苷键是（C-C ）连接。
7、mRNA分子5'末端的帽子结构是（m7Gp5'ppN ）。
8、终止密码子一共有三个，它们分别是（UAA ）、（UGA ）、（UAG ）。
9、在尿素循环中，能穿出线粒体进入细胞质继续反应的代谢物是（瓜氨酸）。
10、肽链延伸包括进位、（转肽）、（移位）三个步骤重复进行。
11、蛋白质生物合成的新生肽链是从（N ）端开始，在mRNA上阅读时，密码子是从（5' ）端到（3' ）端。
12、RNA聚合酶复合物中σ因子的作用是（识别启动基因）。
13、可被转录的DNA链，它的顺序同转录合成的RNA链是（反向互补的）。
14、一段线性双螺旋DNA，在经过连续五次增殖后，最初的DNA占总DNA的比例为（1/32 ）。
15、E.coli中某蛋白质是由250个氨基酸残基构成的单链蛋白，该蛋白质的基因长度是（255 ）nm，合成该蛋白质总共需要（1000 ）分子ATP。
16、DNA聚合酶Ⅰ是多功能酶，若用蛋白酶将其有限水解得到两个片段，其中小片段具有（5'→3' 核酸外切酶）活性。
17、一种氨基酸与专一的tRNA结合是由（氨酰-tRNA合成酶）决定的。
18、以RNA 为模板合成DNA 的酶叫做（逆转录酶）。
19、嘌呤核苷酸分解代谢的最终产物是（尿酸）,若生成过多则出现（痛风）症。
六年级上册语文练习题及答案3篇
【导语】要想学习好，死记硬背是远远不够的，多做试题是难免的，这样才能够掌握各种试题类型的解题思路，在考试中应⽤⾃如。
为⼤家准备了《六年级上册语⽂练习题及答案3篇》，供⼤家参考阅读。
1.六年级上册语⽂练习题及答案：《跟祖⽗学诗》 ⼀、查字典 “闻”⽤⾳序查字法先查___，再查_____（声调可不标）；⽤部⾸查字法先查___部，再查____画。
“闻”在字典中的解释有：A、听见；B、听见的事情，消息；C、出名，有名望；D、⽤⿐⼦嗅⽓味。
请你给下⾯的“闻”选择合适的解释。
1.你闻闻这是什么⽓味?（ ） 2.奶奶家⽣出的⼩⽜居然只有三条腿，成了这⼀带的`奇闻。
（ ） 3.处处闻啼鸟。
（ ） ⼆、看拼⾳写词语 jǐnɡɡào yáo tái bái lù shuāi lǎo tí jiào （ ）（ ）（ ）（ ）（ ） 三、辨字组词 唬（ ） 瑶（ ） 沥（ ） 衰（ ） 琥（ ） 摇（ ） 厉（ ） 衷（ ） 四、课⽂内容我知道。
1.本课选⾃________的回忆体⼩说《呼兰河传》，作者以⼀个单纯幼稚的⼩姑娘之⼝讲述了_______________________的故事。
2.联系上下⽂，说说“房盖被你抬⾛了”是什么意思，表达了祖⽗怎样的情感？ 参考答案 ⼀、W wen 门 6 1.D 2.B 3.A ⼆、警告瑶台⽩鹭衰⽼啼叫 三、吓唬瑶台淅沥衰⽼ 琥珀摇摆厉害热衷 四、1.萧红童年跟祖⽗学诗 2.“房盖被你抬⾛了”意思是说作者念诗声⾳很⼤，似乎要掀翻屋顶，是⼀种夸张的写法。
表达了祖⽗对作者的关⼼与疼爱之情。
2.六年级上册语⽂练习题及答案：《青⼭不⽼》 ⼀、在括号⾥填上合适的词语。
（ ）的⼤树 （ ）的波光 （ ）的狂风 （ ）的环境 （ ）的设想 （ ）的波浪 ⼆、指出破折号的不同⽤法（填序号）。
A.表解释说明B.表语意转换C.表声⾳断续 1．他⽤林业收⼊资助每户买了⼀台电视机——他还有宏伟设想，还要栽树，直到⾃⼰爬不起为⽌。
练习题及参考答案
练习题及参考答案一、选择题1、假设欧元利率为5%，美元利率为3%，根据利率平价理论，欧元对美元的远期汇率应A、升水B、贴水C、上浮D、下浮2、按外汇管制程度不同，可将汇率划分为A、金融汇率和贸易汇率B、官方汇率与市场汇率C、名义汇率和实际汇率D、基本汇率和套算汇率3、以两国货币的铸币平价为汇率确定基础的是A、金币本位制B、金块本位制C、金汇兑本位制D、纸币流通制4、一国货币升值对其进出口贸易的影响是A、出口增加，进口减少B、出口减少，进口增加C、出口增加，进口增加D、出口减少，进口减少5、在直接标价法下，如果需要比原来更少的本币来兑换一定数量的外国货币则表明A、本币币值上升，外币币值下降，通常称为外汇汇率上升B、本币币值下降，外币币值上升，通常称为外汇汇率上升C、本币币值上升，外币币值下降，通常称为外汇汇率下降D、本币币值下降，外币币值上升，通常称为外汇汇率下降6、国际金本位制的特点是黄金可以A、自由买卖、自由铸造、自由兑换B、自由铸造、自由兑换、自由输出入C、自由买卖、自由铸造、自由输出入D、自由流通、自由兑换、自由输出入7、为使国际收支平衡表的借方总额和贷方总额相等而人为设置的项目是A、经常项目B、资本与金融项目C、错误与遗漏D、官方储备8、国际收支平衡表中记录一国的商品出口与进口的项目是A、货物B、服务C、收益D、经常转移9、以下国际收支调节政策中，能使国际收支迅速得到改善的是A、财政政策B、准备金比率政策C、贴现政策D、直接管制10、采用间接标价法的国家或地区有A、美国和英国B、美国和香港C、英国和日本D、中国和日本11、若汇率采用的是直接标价法，即A、外币数额固定B、本币数额固定C、买入价在前，卖出价在后D、买入价在后，卖出价在前E、大多数国家采用12、理论上调节国际收支的手段主要包括A、汇率政策B、货币政策C、信贷政策D、直接管制措施E、财政政策13、根据《我国外汇管理条例》的定义，外汇包括以下内容A、外国货币B、外币支付凭证C、外币有价证券D、普通提款权E、其他外汇资产14、在间接标价下标价数字变大说明A、外国货币汇率上涨B、本国货币汇率上涨C、外国货币下跌D、本国货币下跌E、本币升值15、以下哪些因素会导致本币汇率上升A、国内通货膨胀B、贸易顺差C、资本流入增加D、提高进口关税E、本国利率上升二、计算题1、计算分析题（第四版格式）假设，某国某年发生以下对外经济交易（单位：亿美元）商品出口 101.11商品进口－99.36劳务收入 25.14劳务支出－34.53经常转移－l.10直接投资－2.66证券投资 1.75其他长期投资－5.70其他短期投资 5.84错误与遗漏 x外汇储备变化 7.13根据以上资料进行分析，并回答下列问题：（1）求贸易收支差额、经常账户收支差额、资本与金融账户差额和总差额（2）求错误与遗漏的数额。
练习题+答案
练习题+答案第二章练习题一、单项选择题1、根据借贷记账法的原理，记录在账户贷方的是（）。
AA.费用的增加B.收入的增加C.负债的减少D.所有者权益的减少资产和费用的增加记借，减少记贷；收入、负债和所有者权益增加记贷，减少记借。
2、我国《企业会计准则》将会计要素分为六类，《企业会计制度》将的会计科目分为（）。
BA.六类B.五类C.七类D.三类资产、负债、权益、成本、损益五大类3、借贷记帐法中资产类帐户的余额一般在（）。
BA.无余额B.借方C.贷方D.借方或贷方4、资产类账户期末余额的计算公式是（）。
AA.期末余额 = 期初借方余额 + 本期借方发生额–本期贷方发生额B.期末余额 = 期初贷方余额 + 本期贷方发生额–本期借方发生额C.期末余额 = 期初借方余额 + 本期借方发生额D.期末余额 = 期初贷方余额 + 本期贷方发生额5、下列错误能够通过试算平衡查找的是（）。
DA.重记经济业务B.借贷方向相反C.漏记经济业务D.借贷金额不等试算平衡的具体内容就是检查会计分录的借贷金额是否平衡。
6、“待摊费用”账户本期期初余额3500元，借方本期发生额1500元，本期摊销500元，则该账户期末余额为（）。
B A．借方4500元 B.贷方4500元C．借方3500元 D.贷方1000元待摊费用属于资产类，按照资产类账户计算期末余额。
7、对账户记录进行试算平衡是根据（）的基本原理。
CA.账户结构B.会计要素划分的类别C.会计等式D.所发生的经济业务的内容8、复式记账法是指对每一笔业务都要以相等的金额在相互联系的（）中进行登记的记账方法。
DA.一个账户B.两个账户C.三个账户D.两个或两个以上的账户9、借贷记账法的记账规则是（）。
DA.同增、同减、有增、有减B.同收、同付、有收、有付C.有增必有减，增减必相等D.有借必有贷，借贷必相等 D10、会计账户的开设依据是（）。
CA．会计对象 B．会计要素C．会计科目 D．会计方法11、收到某单位的预付购货款存入银行，所引起的会计要素变动是（） BA一项资产增加，一项资产得减少B一项资产增加，一项负债得增加C一项资产增加，一项负债得减少D一项负债增加，一项负债得减少借：银行存款（资产）贷：预收账款（负债）12、对于每一个账户来说，期末余额（）。
Be动词专项练习题及答案
Be动词专项练习题及答案1. I ___ a teacher. (am / is / are) 答案：am2. He ___ tall. (am / is / are) 答案：is3. They ___ students. (am / is / are) 答案：are4. We ___ in the classroom. (am / is / are) 答案：are5. You ___ my friend. (am / is / are) 答案：are6. It ___ a dog. (am / is / are) 答案：is7. She ___ beautiful. (am / is / are) 答案：is8. This ___ a book. (am / is / are) 答案：is9. Those ___ pens. (am / is / are) 答案：are10. The cat ___ on the chair. (am / is / are) 答案：is11. My mother ___ at home. (am / is / are) 答案：is12. Your father ___ happy. (am / is / are) 答案：is13. I ___ ten years old. (am / is / are) 答案：am14. He ___ a doctor. (am / is / are) 答案：is15. They ___ playing football. (am / is / are) 答案：are16. We ___ good friends. (am / is / are) 答案：are17. You ___ clever. (am / is / are) 答案：are18. It ___ my dog. (am / is / are) 答案：is19. She ___ in the park. (am / is / are) 答案：is20. This ___ my pen. (am / is / are) 答案：is21. Those ___ flowers. (am / is / are) 答案：are22. The bird ___ in the tree. (am / is / are) 答案：is23. My sister ___ nice. (am / is / are) 答案：is24. Your brother ___ tall. (am / is / are) 答案：is25. I ___ happy today. (am / is / are) 答案：am26. He ___ at school. (am / is / are) 答案：is27. They ___ watching TV. (am / is / are) 答案：are28. We ___ in the library. (am / is / are) 答案：are29. You ___ right. (am / is / are) 答案：are30. It ___ a car. (am / is / are) 答案：is31. She ___ singing. (am / is / are) 答案：is32. This ___ my house. (am / is / are) 答案：is33. Those ___ books. (am / is / are) 答案：are34. The ball ___ under the table. (am / is / are) 答案：is35. My uncle ___ kind. (am / is / are) 答案：is36. Your aunt ___ beautiful. (am / is / are) 答案：is37. I ___ a girl. (am / is / are) 答案：am38. He ___ playing the piano. (am / is / are) 答案：is39. They ___ running. (am / is / are) 答案：are40. We ___ in the park. (am / is / are) 答案：are41. You ___ tired. (am / is / are) 答案：are42. It ___ a bird. (am / is / are) 答案：is43. She ___ dancing. (am / is / are) 答案：is44. This ___ my computer. (am / is / are) 答案：is45. Those ___ oranges. (am / is / are) 答案：are46. The dog ___ on the floor. (am / is / are) 答案：is47. My cousin ___ smart. (am / is / are) 答案：is48. Your friend ___ happy. (am / is / are) 答案：is49. I ___ at home. (am / is / are) 答案：am50. He ___ reading a book. (am / is / are) 答案：is。
练习题及参考答案
1第一章1-1. 晶体与非晶体的本质区别是什么？单晶体为何有各向异性而实际金属表现为各向同性？（1）晶体中的质点在空间作有规则的排列，而非晶体内部的质点排列不规则 （2）因为不同的晶面及晶向上，原子的排列情况不同，所以晶体表现为各向异性，而实际金属是由很多方向各异的单晶体杂乱排列而成，所以整体表现为各向同性。
1-4. 铜和铁室温下的晶格常数分别为0.286n m 和0.3607n m ，求1c m 3铁和铜中的原子数。
1n m (n a n o m e t e r )=10--99m =10A (a n g s t r o n g ) 铜的晶格常数＝0.286 x 10--77c m 铁的晶格常数＝0.3607 x 10--77c m1c m 3铜的原子数＝3)710286.0(31cm x cm - x 4 ＝ 1.71x 10231c m 3 铁的原子数＝3)7103607.0(31cm x cm -x 2 = 4.26x 102221-5. 常见的金属晶体典型结构有哪几种？α－F e , γ－F e , C u , A l , N i , P b , C r , V , M o , M g , Z n , W 各属于何种晶体结构？面心立方结构、体心立方结构、密排六方结构 γ－F e , C u , A l , N i , P b - 面心立方结构 α－F e , C r , V , M o , W - 体心立方结构 M g , Z n - 密排六方结构1 作图表示立方晶系（211）、（112）、（210）、（321）、（223）、（236）晶面与[111]、[111]、[021]、[112]、[211]、[123]晶向。
解：如图所示。
（211）、（112）、（210）、（321）、（223）、（236）晶面：（211） （112） （210）1.2★作图表示立方晶系（211）、（112）、（210）、（321）、（223）、（236）晶面与[111]、[111]、[021]、[112]、[211]、[123]晶向。
非谓语动词专项练习100题（含答案）
非谓语动词专项练习100题（含答案）1.The great hall was crowded with many people, __many children __on their parents’ laps.A.including; seated B.including; seating C.included; sat D.included; sitting 2.It’s said that the Olympic Games __ in Beijing in 2008 will cover more events than any other Olympics did. A.holding B.to be held C.held D.to be holding 3.____for a long time, most of the crops in this area died from lacking water. A.Being no rain B.There was no rain C.To be no rain D.There being no rain 4.A street-beggar bought a lottery ticket purposelessly,__him a millionaire overnight. A.making B.makes C.to make D.made 5.In the face of the big fire in October in California, many people in the fire-stricken areas moved out _____. A.to escape burning B.to escape being burned C.escaping burned D.escaping from burning 6.Taking this medicine, if _____, will of course do good to his health. A.continued B.to continue C.continues D.continuing 7.The little boy still needs the _____20 dollars to do with some things _____. A.remaining; remained to be settled B.remaining; remaining to be settled C.remained; remained to settle D.remained; remaining to settle 8._____ his age, the little boy read quite well. A.Considering B.Considered C.Consider D.Having considered 9.___from the appearance,it is very peaceful;but in fact,a war will break out soon. A.Judged B.Judging C.Having judged D .To judge D.To judge 10. —Tom enjoys ___ basketball on Sunday afternoons, doesn’t he?— Yes, he does. But what his sister enjoys _____. A.to play; dancing B.playing; to dance C.to play; to dance D.playing; is to dance 11.His letter, _____ to the wrong number, reached me late. A.having been addressed B.to have addressed C.to have been addressed D.being addressed 12. The Space Shuttle Columbia broke into pieces over Texas as it returned to the earth on February 1, 2003, _____ all sev astronauts aboard. A.having killed B.killing C.being killed D.killed 13. There are lots of places of interest _____ in our city. A.needs repairing B.needing repaired C.needed repairing D.needing to be repaired 14. — What caused the party to be put off? What caused the party to be put off? —— _____ the invitations. A.Tom delayed sending B.Tom’s delaying sendingC.Tom delaying to send D.Tom delayed to send 15. I was afraid _____ to my customers because I was afraid _____ them. A.of talking back; to lose B.of talking back; of losing C.to talk back; to lose D.to talk back; of losing 16.Standing on the top of the hill, I would not do anything but _____ the flowing of the smog around me. A.enjoy B.enjoying C.enjoyed D.to enjoy 17.17.—— Is Tom a good talker? — No, he never speaks to me other than _____ something? A.ask for B.to ask for C.asked for D.asking for 18.I can’t get my car __ on cold mornings, so I have to try __ the radiator with some hot water.A.run; to fill B.running; filling C.running; to fill D.ran; filling 19.The drunken husband knocked against the table and sent the bowls _____ in all directions before he was sent _____ by h wife. A. flying; to sleep B. flying; sleeping C. to fly; to sleeping D. to fly; to sleep 20. When we got back from the cinema,we found the lamp ___but the door ___. A. being on; shut A. being on; shut B. burning; shutting B. burning; shutting B. burning; shutting C. burning; shut C. burning; shut D. on; shutting 21.We found the students seated at tables and had their eyes ____on the scene of the launch of Shenzhou V spaceship. A. fixed B. fix C. fixing D. to fix 22.A doctor can expect _____ at any hour of the day or night. A. calling B. to call C. being called D. to be called 23.The boy often gives a satisfactory answer to the teacher’s question, ____ just a minute. So he’s usually the teacher’s pet. A. thought B. having thought C. and to think D. thinking 24.The policeman came up to the lonely house with the door ____, ___there for a while and then entered it. A. open; to stand B. opening; stood C. open; stood D. opened; standing 25._____ along the quiet road at forty miles an hour, and then an old man suddenly started to cross the road in front of me. A. Driving B. I was driving C. Having driven D. When I was driving 26.Mr. Smith was much surprised to find the watch he had had ___was nowhere to be seen. A. repairing B. it repaired C. repaired D. to be repaired 27.What did the librarian _____ out of the library? A. permit to take B. forbid to be taken C. allow to take D. insist being taken 28. — Mum, why do you give me so much popcorn? — _____ the boring time. A. Kill B. Killing C. To kill D. Having killed 29.What Yang wanted to do when he got out of the spaceship was __the joy with all the Chinese. A. share B. shared C. having shared D. about to share 30.When she was alone at home, Mary needed a friend _____. A.playing with B.having played with C.with whom to play with D.with whom to play 31._____ the big snake, the little girl stood under the tree _____ out of life. A.Seeing; frightened B.Seeing; frightening C.Seen; frightened D.To see; frightening D.To see; frightening 32.The competitor never dreamed of __ for him to win the first prize in the 100-meter race. A.there was a chance B.there being a chance C.it being a chance D.it was a chance 33._____ everything to go wrong in advance, and you won’t feel quite so bad when it doe s. A. Having expected B. Expect C. To expect D. Expecting 34.34.—— You _____ part in the party on time. — Sorry, I was delayed by the accident. A.are to take B.have supposed to take C.were to have taken D.supposed to take 35._____ with the size of the whole earth, the highest mountain doesn’t seem high at all.A. When compared B.To compare C. While comparing D. It compared 36._____ in her best suit, the girl tried to make herself _____ at the party. A.Dressed; noticed B.Dressing; noticing C.Dressed; noticing D .Dressing; noticed D.Dressing; noticed 37.The matter _____ your study surely requires _____ carefully. A. relating to; dealing with B. related to; dealt with C. related to; being dealt with D. relating to; having dealt with 38._____ made her parents worried a lot. A. Her not to come back B. Not her to come back C. Her not coming back D. Not her coming back 39.Everything ___into consideration, they believed themselves more and returned to their positions. A.to take B.taken C.to be taken D.taking 40.He moved away from his parents and missed them ____enjoy the exciting life in New York. A. much so as to B. very much to C. too much to D. enough to 41.41.—— What do you think of the plan? — It’s easier said than _____. than _____. A. carried out B. carrying out C. carry out D. to carry out 42.Many businessmen attended the Boao Forum because they knew what __ from the forum. A. to get B. to be got C. got D. getting 43.There was a famous person at the party whom everyone would like _____to themselves. A. to introduce B. to be introduced C. introducing D. being introduced 44.44.—— Were you at home last Sunday? — Yeah! I devoted the whole day to _____ the English grammar. A. review B. reviewing C. be reviewed D. being reviewed 45.Once _____ at the shop, you will be dismissed immediately. A. caught stealing B. caught to steal C. catching stealing D. to catch to steal 46. Prices of daily goods____through a computer can be lower than store prices. A. are bought B. bought C. been bought D. buying 47._____, John returned to school from his hometown. A. The summer vacation being over B. The summer vacation is over C. Because the summer vacation over D. After the summer vacation being over 48._____ she can’t come, who will do the work?A. Supposed B. Supposing C. Having supposed D. Being supposed 49.49.—— Is there anything you want from town? — No, thank you. But I would like to get ___. A.those letters mailed B.mailed letters B.mailed letters C.to mail those letters D.those letters mail 50.After the guests left, she spent as much time as she could _____ the rooms. A. tidy up B. to clear away C. clear away D. tidying up 51._____ it or not, his discovery has shocked everyone in scientific circles. A. Believe B. To believe C. Believing D. Believed 52.To tell you the truth, I’d rather read than watch television; the programs seem __all the time.A.to get worse B.to be getting worse C.to have got worse D.getting worse 53.After the Arab states won independence, great em phasis was laid on education, with girls as well as boys _____ to go to school. A. to be encouraged B. encouraging C. encouraged D. be encouraged 54.Everyone had an application form in his hand, but no one knew which office _____. A. to send it to B. to send it C. to be sent to D. to have it sent 55.___that it was going to snow, the climbers decided to put off their attempt on the highest mountain. A. Having told B. Having been told C. Tell D. Telling 56.As is known to us all, traveling is __, but we often feel __ when we are back from travels. A.interesting; tired B.interested; tiring C.interesting; tiring D.interested; tired 57.The foreign tourists have visited many scenic spots in Shanghai,____as interpreter. A. the guide acts B. the guide acting C. acting D. acted 58.Linda is thought to___ in Africa, but I really don’t know what country she’s working in.A. have worked B. work C. be working D. be worked 59._____ 59._____ time time time and and and labor, labor, labor, cartoonists cartoonists cartoonists generally generally generally draw draw draw the the the hands hands hands of of of their characters their characters with with only only only 3 3 3 fingers fingers fingers and and and a a a thumb. thumb. A.To save B.Saved C.Saving D.Having saved 60.I am busy ____ for the entrance examination, so I can’t help ____housework at home.A.preparing; doing B.preparing; to do C.to prepare; doing D.to prepare; to do 61.In order to protect our planet, _____. A.all kinds of pollution should be reduced B.we should reduce all kinds of pollution C.the environment should be protected first D.it’s important to protect our environment62.Hoping he would not be seen, Bob stole in, ___his schoolbag and rushed out. A. picking up B. picked up C. to pick up D. having picked up 63.____money 63.____money if if if you you you can can can and and and many many many poor poor poor children children children in in in the the the poor poor poor mountainous mountainous mountainous areas areas areas will will will be be be able able able to to to go go go back back back to to to school. school. A.Having given B.Given C.To give D.Give 64.Whatever trouble Mr. White had ___with the case, he would stick to his own opinion. A.deal B.to deal C.dealt D.dealing 65.While listening to pop music, _____. A.she felt asleep B.the light went out C.someone knocked at the door D.and she couldn’t help laughing66.___ the distance was too long and the time was short, we decided not to drive to Florida. A. Discovering B. To discover C. To have discovered D. Discovered 67._____, J.K. Rowling is considered to be the best fiction writer A.Having sold millions of copies of her books B.Because millions of copies of her books are sold C.Sold millions of copies of her books D.Selling millions of copies of her books 68.What surprised me most was that there appeared a ____ look on her face on hearing the unexpected news. A.worrying B.worried C.worry D.worries 69._____ one of the most important inventions of the time, the computer helps people living in different countries to do a lot 69._____ one of the most important inventions of the time, the computer helps people living in different countries to do a lot things. A.Knowing to be B.It was known C.Known as D.Which was known to be 70.70.—— Did you enjoy yourself last night? — It’s very nice of you. I appreciated _____ to the party.A. to be invited B.to have invited C.being invited D.having been invited 71.If you go to the West Lake in Hangzhou, you will find it more attractive than commonly__. A. supposing B. to suppose C. supposed D. being supposed 72.72.—— Haven’t you seen the sign,_____ “NO PHOTOS”? — I’m really sorry I didn’tA. reads B. to read C. read D. reading 73.73.—— Do you feel like _____ out? — No. I’d rather we _____ a taxi.A. to drive; take B. to drive; took C. driving; take D. driving; took 74.74.—— Kate shouldn’t have done that sort of thing.— Whatever she did was reasonable, ____to what you had done. Besides, it’s none of your business. Get down to _____ you work. A. comparing; doing B. comparing; do C. compared; doing D. compared; do 75._____ nice and delicious, the fried chicken was soon sold out. A. Tasted B. Being tasted C. Tasting D. To taste 76.76.—The plan is heard ____ so well that we don’t have to make any changes. —The plan is heard ____ so well that we don’t have to make any changes. — It is indeed. A. to design B. designing C. designed D. design 77.W 77.While we’re developing agriculture and industry, we must prevent the earth___.hile we’re developing agriculture and industry, we must prevent the earth___. A. from polluting B. polluted C. polluting D. being polluted 78.The woman found it no good _____ her daughter too much money. A. giving B. being given C. given D. gave 79.He felt it a great honor _____ to visit me when I was in his city. A. to have been taken B. to have taken C. having taken D. being taken 80.Will you please tell me why you had no pen _____ in class, Kate? A.to have written B.to be written with C.to have been written D.to write with 81.Her dress has become loose. She appears _____ weight. A. to lose B. being lost C. losing D. to have lost 82.The building ____ will be completed in a month. It will be our lab building. A. to paint B. being painted C. to have painted D. painting 83.I find these problems are easy _____. A.to be worked out B.to work them out C.to work out D. to be worked them out 84.84.——What do you think of last night’s lecture? — _____ speaking, I thought it was rather boring. A. Real B. General C. Fair D. Honestly 85.Nancy let me repeat her instruction _____ sure that I understood what was _____ after she was away on business. A.to make; to be done B.making; doing C.to make; to do D.making; to do 86.The purpose of new drugs used on patients is to make them less painful, __ them more terrible. A.not make B.not to make C.not making D.do not make 87.As the stone was too heavy to move, I left it _____on the ground. A. laying B. lay C. lying D. lain 88.88.—— I would like to buy an expensive camera. — Well. We have several models __. A. to choose from B. of choice C. to be chosen D. for choosing st night I saw Yang Weiwei lying in bed, _____in deep thought. A. lost B. losing C. to lose D. being lost 90.Tigers _____ meat-eating animals _____ meat. A. belonged to; fed on B. belonging to; feed on C. were belonged to; feed on D. belonging to; feeding on 91.91.—— Is it _____ the bad smell that is difficult ? — Of course. A. how getting rid of B. got rid of C. to get rid of D. being got rid of 92.92.—— Have you made up your mind _____ the chance to go to France? — No. I’m practicing _____ the French language.A.to give up; to learn B.to give up; learning C.giving up; to learn D.giving up; learning 93.Never _____ off your coat; it’s rather cold outside.A. take B. taking C. to take D. taken 94.A big factory has been set up in this area ___ such goods for people all over the country. A. to produce B. producing C. produced D. being produced 95.The _____ look in her face suggested that she _____ it before. A. surprising; wouldn’t know B. surprised; hadn’t knownC. surprising; hadn’t known D. surprised; shouldn’t know96.You have no business _____ to me the way you did yesterday. A. about talking B. talking C. talked D. on talking 97.___ what he can do. He might get a job tomorrow. He might stay out of work for weeks. A.We didn’t know B .He doesn’t knowB.He doesn’t know C.There is no knowing D.It was known that 98.John’s bad habit is _____ without thorough understandingA.read B.being read C.to be read D.reading 99.She reached the top of the hill and stopped _____on a big rock by the side of the path A.to have rested B.resting C.to rest D.rest 100.We must treasure every minute because _____ time is _____ forever. A.lost; losing B.lost; lost C.losing; losing D.losing; lost 非谓语动词专项练习答案及部分解析：非谓语动词专项练习答案及部分解析：1.A 。
《空气有质量吗》练习题及答案
《空气有质量吗》练习一、填空题1、空气很轻，但是，空气还是质量的。
（选填：有、没有）2、书包、书本、桌子、椅子、人等周围所有看得见的物质，都质量。
（选填：有、没有）3、多充气20下的皮球和多充气10下的皮球质量是，因为多充气20下,皮球里的空气就要比多充气10下皮球里的空气，因此要大一些，由此我们可以得出结论:充气越多,皮球和空气的总质量 ,说明空气是。
4、放气后的皮球，与之平衡的绿豆数目。
二、判断题1、书本有质量。
（）2、空气没有质量。
( )3、和相同体积的水、石头相比，空气的质量最小。
（）4、物质的质量是一成不变的。
( )5、在实验过程中，可以大声喧哗，来回跑动。
（）6、在使用天平过程中，需要先检查天平是否平衡。
（）三、选择题1、有一种物质，它能占据空间、能流动，没有固定的形状，易压缩，重量较轻，它会是( )A.水B.空气C.石头2、在两个同样大小的塑料袋里分别装满水和空气，称量比较准确的结果是( )。
A.装满水的塑料袋重B.装满空气的塑料袋重C.两个塑料袋-样重3、下列不能证明空气有质量的是（）。
A.皮球充气前后在电子天平上的示数不一样B.在平衡尺一端挂上空气球，另一端挂上相同的充气气球，平衡尺不平衡C.将气球充满气后，放在水面上，气球能浮在水面上。
4、空气总是在( )运动的。
A.向上B.向下C.循环四、解答题1、请你结合课堂所学知识，说说哪些物质具有质量？_____________________________________________________________________ _____________________________________________________________________ 2、请你结合课堂所学知识，说说物质的质量在生活中，有哪些应用?_____________________________________________________________________ _____________________________________________________________________五、实验分析题1、设计一个探究“空气是否有质量”的实验:【1】实验名称:探究“空气是否有质量”【2】我的假设:空气_________质量。
100道练习题,带答案大全
100道练习题,带答案大全1.23.4.5.6.7.8.9.10.11.12.13.14.15.16. 将下面左图进行折叠后，得到的图形是17.18.19.20.21.22.23.24.25.26.字形练习纠纠武夫A 1．下列词语中，没有错别字的一组是A．涣散机 B．涉密瘴 C．陨命石 D．遴选端倪斑驳陆离肄业得鱼忘筌僭越振聋发聩纽扣摄像白内绊脚金刚钻B白内瘴--白内障；C陨命--殒命；D 纠纠武夫-- 赳赳武夫筌:捕鱼用的竹器。
捕到了鱼,忘掉了筌。
比喻事情成功以后就忘了本来依靠的东西。
2．下列各组词语中字形都正确的一组是倦”“鞍马劳神”。
指长途跋涉A．屹立妥贴亲和力或战斗中备尝困乏。
瓦釜雷鸣涵咏优游B．嬉戏坐镇迫击炮趾高气扬浅尝辄止C．肤浅蜇居座右铭攻艰挫锐置之不理D．遐想犄角嘉奖令两全齐美鞍马劳顿:骑马赶路过久，劳累疲困。
形容旅途或战斗的劳累。
同“鞍马劳B试题分析：A．妥帖涵泳优游指从容求索，深入体会。
C．蛰居攻坚挫锐D．两全其美。
3．下列词语中，没有错别字的一组是 A．煤炭姆指笑咪咪大快朵颐B．埋单搭档泊来品有错别字的一组是锄强扶弱A．演绎恻隐编纂C．赋予委屈 ?摊血见微知著D．付梓经典雷震雨惩前毙后CA项，拇指，笑眯眯；B项，舶来品；D项，雷阵雨，惩前毖后。
选C。
4．下列词语中，没再接再厉 B．敲榨暗淡集思广益 C．曼妙蛊惑闲情逸志 D．险衅狼藉斑驳陆离A试题分析：B项，敲诈 C缭绕衍生篇副项，闲情逸致D项，篇幅。
错别字的一组是要准确辨识汉字，就应从形、音、A．讳疾忌医微言大义义三者关系入手，应做到字不离词，以义正字，以义辨形；这种方法特别适用于同音字。
例如”筹”和”愁”音同而形异，”筹”有”计策、办法”的意思，”愁”是”忧愁”之义，”一筹莫展”“愁肠百结”自然就分清了。
5．下列词语中，没有万事具备，只欠东风 B．磐竹难书两全其美一言既出，驷马难追 C．掷地有声曲意逢迎桃李不言，下自成蹊 D．至高无上原型必露失之东隅，收之桑榆 C试题分析：“万事俱备” “俱”是“全”“都”的意思，而“具锐不可当B．蜇居副作用指备”是“有”的意思，A项排除；手画脚屈指可数 C．凑合哈密瓜眼花缭乱“竹难书” “罄”，是“罄尽，完”意思，而“磬“是古代石制的一种打击乐器，B项排除；“原形毕露”．下列词语中，没有错别字的是A．妥帖亲和力披沙拣金膏梁子弟D．犄角嘉奖令两全齐美仗义执言A试题分析：可根据常见的容易混淆的词语知识的积累，结合着词语意思判断。
英语练习题习题及答案
Ⅰ. 单选题1. Eyes play an important role in body balance and it is important to ____ as much information from the environment as possible.A. absorbB. involveC. inventD. conquer2. Whatever one has planned to do is ____ to be altered in the process.A. prohibitedB. eagerC. embarrassedD. bound3. If your children are spending too much time on computer games, think carefully about how you are going to ____ the situation. A. accomplish B. arrange C. handle D. decrease4. She fell asleep at last, but in no time at all the pain in her back ____ her again, sharp and insistent.A. conqueredB. wakenedC. absorbedD. retired5. Early in the morning, I was ____ out of bed to repair a minor fault on the car.A. distractedB. draggedC. wakenedD. assigned6. You should make sure you know where the parents can be ________,and that they have given you all the information you are likely to need about the child.A. connectedB. communicatedC. committedD. contacted7. On one _______, they locked her in a car when they went to a call and wound up the window to prevent her overhearing (偷听).A. occasionB. campusC. voyageD. basis8. If you wish, we can ______ for your luggage (行李) to be sent on ahead to each of the overnight stops.A. memorizeB. contractC. arrangeD. commit9. The boy ______ turned the TV off as the clock struck ten, time for him to go to bed.A. reluctantlyB. disappointedlyC. fortunatelyD. undoubtedly10. I started to read newspapers and magazines more, and, for just about the firsttime in my life, I began to take an interest in _______ affairs.A. personalB. currentC. ancientD. social11. I’d like to ________ that students should be allowed more time for independent study.A. proposeB. commandC. arrangeD. steer12. On a ________ day, our professor works in the lab from 9 A.M. to 11 P.M..A. followingB. typicalC. previousD. diligent13. He might as well have picked a family ________ out of the telephone book and stayed with them.A. at randomB. at a timeC. after allD. in detail.14. The books are beautifully ____ with drawings and photographs.A. illustratedB. designedC. writtenD. covered15. A sign at our local church is in wood, with gold lettering, but the ____ is already fading after three years.A. productB. latterC. laterD. medal16. The ____ table (写字台)takes up too much space in my small office.A. to writeB. writingC. writtenD. write17. They failed to convince her of his ____.A. honestyB. honestC. dishonestlyD. honestly18. He suggested that the novel ____ into a film.A. makeB. madeC. makingD. be made19. His report on the Olympic Games was really ____.A. exciteB. excitingC. excitementD. excited20. Mary picked ____ a book from the floor and began to read.A. onB. inC. outD. up21. She is young and ____, but she is good at learning.A. experienceB. inexperienceC. experiencedD. inexperienced22. His classmates tried to persuade him ____ swimming across the river, but he did not listen.A. fromB. inC. onD. to23. Nowadays we rely more and more ____ computers to help us in doing everything.A. inB. fromC. onD. to24. Ann has a wheelchair that was ____ designed for her.A. especiallyB. especialC. specialD. specially25. You are ____ to fail the exam if you don’t do any revision.A. boundB. bunchC. relyD.pick答案：1.A 2.D 3.C 4.B 5.B 6.D 7.A 8.C 9.A 10.B 11.A 12.B 13.A 14.A 15.B 16.B 17.A 18.D 19.B 20.D 21.B 22.A 23.C 24.D 25.A1. Large-scale studies are needed to____ the encouraging results we have obtained so farA. conductB. confirmC. contractD. commit2. W hoever disobeys the company’s safety regulations shall be＿＿on the spotA. dismissedB. switchedC. interruptedD. revealed3. All the questions the police asked____ what she had been doing on the night of the robberyA. brought upB. revolved aroundC. built onD. singled out4. If schoolchildren are allowed to work at their own____, their performance will generally improveA. versionB. paceC. evolutionD. system5. To attract foreign investors, you have to____ them that their investment will have profitable returnsA. confirmB. stimulateC. grabD. convince6. The conference was an attempt to____ discussion of the problem of widening gaps between the rich and the poorA. stimulateB. conductC. intendD. uncover7. The clerk held my passport four inches from his face and____ to read itA. affectedB. flippedC. strainedD. giggled8. If these problems are not____ early in their training, they can be a real danger to themselves and to their instructorsA. skippedB. contractedC. spottedD. responded9. Tourism authorities ____ quickly to reports of the attack, claming that it was accidental and that crime against tourists was quite rare in the scenic areasA. addedB. fastenedC. skippedD. responded10. To ____ for the position, applicants would need to have a PhDdegree and 3 year’s working experienceA. strainB. qualifyC. registerD. campaign11. ____his age, he can not finish this task all by himself.A. GivenB. GiveC. GaveD. Giving12. The travelers were about to cross the river____ a storm broke.A. thenB. atC. thereD. when13. You are meant____ before you come in.A. payB. payingC. to payD. paid14. I don’t teach____ I think I know the answer.A. thatB. whyC. whenD. because15. He entered the office____ by the way she had spoken to him.A. annoyedB. annoyingC. annoyD. annoys16. The road gradually widened until we found____ in a large valley.A. meB. usC. ourD. ourselves17. He will help you to prepare____ you need to say in the meeting next week.A. thatB. whatC. whichD. when18. Little____ guess that in a few year s’ time the young man who used to live next door to them would become a superstar.A. does theyB. they doesC. did theyD. they did19. He ran as____ as he could in the hope of breaking his record for the five miles.A. harderB. hardlyC. hardestD. hard20. ____ the whole country rose up to drive the aggressors from their homeland.A. It is long before thatB. It wasn’t long before thatC. It isn’t long before thatD. It wasn’t long before that21. ---“Ben looks pale, what’s happened to him “---“Nothing serious, just____ he was a bit upset about losing the game.”A. thatB. whenC. whyD. as22. I would rather____ early, and get home before it gets dark.A. to goB. goingC. goneD. go23. Needless to say, we place our hope on____ young.A. aB. manyC. theD. an24. All research is built____ work completed by previous researchers.A. onB. atC. inD. out25. This show will no doubt add____ his reputation.A. onB. atC. inD. to答案：Part II. ClozeMany of you are studying English and you may be wondering why it is so difficult to learn． It is actually not that difficult to learn _1_ you know some basic facts _2_ the language and the culture that it reflects (反映)．Perhaps the first thing you need _3_ English is that it is _4_ up of several other languages such _5_ French, German ,Latin ,Greek Anglo-Saxon． _6_ addition ,there are words from Spanish in English and many American Indian words and names; _7_ some Chinese and Japanese words have found their way _8_ the English language． This borrowing of words from _9_ languages is one of the key reasons for some of the difficulties that people meet with _10_ they are learning English．1．A. so B. and C. but D. if2．A. with B. about C. at D. in 3．A. know B. knowing C. to know D. known 4．A. make B. making C. maked D. made5．A. as B. for C. that D. was 6．A. also B. in C. but D. yet 7．A. even B. in C. from D. to8．A. even B. into C. from D. to9．A. a B. an C. any D. other10．A. while B. that C. which D. since 答案：1.D 2.B 3.C 4.D 5.A 6.B 7.A 8.B 9.D 10.A阅读理解Passage oneI was born in the city of York, in England, in the year 1632. My father was a man of some wealth, able to give me a good home and send me to school. It was his wish that I should be a lawyer buy my head began to be filled very early with thoughts of rambling, and I would be satisfied with nothing but going to sea. My father gave me strong and earnest counsel against it, but with little effect. One day, being at Hull, I met a school-fellow who was about to sail for London in his father's ship, and he prompted me to go with him, and in an evil hour, without asking God's blessing or my father's,I went on board.On the way to London, a storm arose, the ship was wrecked, and we barely escaped with our lives. I went on foot to London, where I met with the master of a vessel which traded to the coast of Africa. He took a fancy to me, and offered me a chance to go with him on his voyages, which I gladly accepted.A great storm came up, and the ship was tossed about for many days, until we did not know where we were. Suddenly we struck a bank of sand, and the sea broke over the ship in such a way that we could not hope to have her hold many moments without breaking into pieces. In this distress we launched a boat. After we had been driven four or five miles, a raging wave struck us so furiously that it overset the boat at once. Though I swam well the waves were so strong that I was dashed against a rock with such force that it left me senseless. But I recovered a little before the waves returned, and, running forward, got to the mainland safely.1. What did the author want to do when he was youngA. To visit AfricaB. To sail the seasC. To practice lawD. To make a tour of London2. Why did the author go on foot to LondonA. The ship he took was destroyed in a storm.B. His father did not supply the fare for the journey.C. He went against his father’s strong device not to do so.D. His school-fellow invited him to go together.3. Why did they launch a boatA. They know they were near a shore.B. The big waves were about to overturn the ship.C. Their ship had been knocked about for may days on the sea.D. Their ship had struck sand and was about to break into pieces.4. When the author got to the mainland, he ____.A. searched everywhere for his lost companions.B. fell down on the ground senseless.C. was safe and sound.D. ran forward to escape being washed back into the sea.5. When the author finally arrived on land, he most probably ____.A. knew he was in Africa.B. did not know where he was.C. was not aware he was back in England.D. got in touch with his family and asked for help.Passage twoSome people have it easy. When their kids ask them what they do at work, th ey can give a simp1e direct answer: “I put out fires” or” “I fix sick peop1e” or” “I teach primary schoo1”. As a theoretica1 physicist, I never had this 1uck . Society has come toexpect many things from the physicist. 1t used to be that me on1y bad to discover the basic 1aws of the wor1d and supp1y the techniques that wou1d power the next of things we think we know how to do. What makes us uncomfortab1e-and what makes it hard for us to te11 our kids what we’ re up to-is that in this century we have become, though unwi11ing1y, gurus on questions such as “what is the nature of Rea1ity (现实) ”We now deal with a whole new c1ass of prod1ems .We ask how the wor1d began and what is the nature4 of matter. The answers we are coming up with are just not easy to comprehend for the average person.So, when physicists get out of their cars in the morning, have a cup of coffee and sit down in front of their computers, they 1eave a fami1iar wor1d and enter a p1ace where things act in of strange ways that are impossid1e for ordinary peop1e to understand.6.According to the passage, in a way physicists areA. intel1igentB. comfortad1eC. strangeD.un1ucky7. Judging from the context, the word: “gurus” in the first paragraph most probab1y means a person.A.who acts as a teacher and answers big questionsB.who gives wrong answers to big questionsC.who does not 1ike to answer big questionsD.who is eager to supp1y answers to big questions8. Which of the fo11owing is true according to what the author says about physicistsA.physicists do not 1ike their job.B.Physicists 1ive in two different wor1ds.C.Physicists are coming up with new answers to o1d questions.D.Physicists don’t have to te11 peop1e what they are doing.9. Which of the fo11owing statement is trueA.Theoretica1 physicists on1y have to answer the basic questionsabout the wor1d.B.Theoretica1 physicists contributed do the new industry onSi1icon Va11ey.C. Theoretoca1 physicists have disappointed the expectations ofmany peop1e.D.Theoretica1 physicists have found it hard to friends withordinary peop1e.10. Which of the fo11owing is true shout the job of physicistsA.It is getting more and more difficu1t.B.It is beyond the comprehension of ordinary peop1e.C. A person with average inte11igence can not do it.D. Both A and B.答案：1.B 2.A 3.D 4.C 5.B 6.D 7.A 8.B 9.B 10.BPassage oneA couple of years ago I spent the day at an elementary school in New Jersey. It was a nice average school, a square and solid building, full of reasonably well-behaved kids from middle-class families. I handled three classes, and by the time I staggered out the door I wanted to lie down for the rest of the day. Teaching’s the toughest job there is. In his new memoir, “Teacher Man,” Frank McCourt recalls telling his students, “Teaching is harder than working on docks and warehouses. ” Not to mention writing a column. I can stare off into the middle distance with my chin (下巴) in my hand any time. But you go mentally south for five minutes in front of a class of fifth graders, and you are sunk.The average new teacher today makes just under $30,000 a year, which may not look too bad for a twenty-something with no mortgage (抵押贷款) and no kids. But soon enough the new teachers realize that they can make more money and not work anywhere near as hard elsewhere. After a lifetime of hearing the old legends about cushy (舒适安逸(de)) hours and summer vacations, they figure out that early mornings are for students who need extra help, evenings are for test corrections and lesson plans, and weekends and summers are for second and even third jobs to try to pay the bills.According to the Department of Education, one in every five teachers leaves after the first year, and almost twice as many leave within three. If any business had that rate of turnover, someone would do something smart an d strategic to fix it. This isn’t any business. It’s the most important business around, the gardeners of the landscape of the human race.Unfortunately, the current way of dealing with problems in education is taken directly from business practice, and it’s a terrible fit. Instead of simply acknowledging that starting salaries are woefully low and committing to increasing them and finding the money for reasonable recurring raises, politicians have wasted decades talking about something called merit pay (奖励工资). It’s a concept that works fine if yo u're making toys, but kids aren’t toys, and good teaching isn’t an assembly line.1. What can we infer from the first paragraph about teachersA. They have to teach three classes at a time.B. They have a very rewarding job.C. They prefer to teach children from middle-class families.D. They have a very hard job to do.2. Why does the author say teaching is tougher than writing a columnA. Teaching is like working on docks and warehouses.B. Teaching demands full attention.C. Teachers have to work with children.D. Teachers have no chance to go traveling.3. What do new teachers find out after some practiceA. Their starting salary is lower than offered by other occupations.B. They have to work during vacations to make ends meet.C. They have to plan their time well to get everything done.D. They can take a second or even a third job besides teaching.4. We can infer from the fourth paragraph that the author thinks __________.A. measures should be taken to keep teachers in their jobsB. the rate of turnover in teaching is low compared to other occupationsC. it’s natural for a number of teachers to quit in three to five yearsD. it’s fair to call teachers the gardeners of the landscape of the human race5. What does the author think of merit payA. It will make up for teachers’ low starting salaries.B. It will bring down the turnover rate of teachers.C. It is a good fix for current educational problems.D. It is not suitable for the teaching profession.Passage twoI’m coming off this plane, and landing at London airport. I’m looking around for a middle-aged woman, my Aunt Penn, who I’ve seen in pictures. The photographs are out of date, but she looked like the type who would wear a big necklace (项链) and flat shoes, and maybe some kind of narrow dress in black or gray. But I'm just guessing since the pictures only showed her face.Anyway, I’m l ooking and looking and everyone’s leaving and there’s no signal on my phone and I'm thinking, “Oh great, I'm going to be abandoned at the airport so that's two countries they don't want me in,” when I notice everyone’s gone except this kid who comes up to me and says, “You must be Daisy.” And when I look relieved he does too and says. “I’m Edmond.”“Hello Edmond,”I say, “nice to meet you.” I look at him hard to try to get a feel for what my new life with my cousins might be like.Now let me tell you what he looks like before I forget because it's not exactly what you'd expect from your average fourteen-year-old what with the cigarette and hair that looked like he cut it himself with a knife in the dead of night, but aside from that he's exactly like some kind of mutt, you know the ones you seeat the dog shelter who are kind of hopeful and sweet and put their nose straight into your hand when they meet you with a certain kind of dignity and you know from that second that you're going to take him home Well that’s him.Only he took me home.I’ll take your b ag, he said, and even though he’s about half a mile shorter than me and has arms about as thick as a dog leg, he grabs my b ag, and I grab it back and say “Where's your mom, is she in the car ”And he smiles and takes a drag on his cigarette, which, even though I know smoking kills and all that, I think is a little bit cool, but maybe all the kids in England smoke cigarettes I don’t say anything in case it’s a well-known fact that the smoking age in England is something like twelve and by making a big thing about it I’ll end up looking like an idiot when I’ve barely been here five minutes. Anyway, he says. “Mum couldn't come to the airport because she's working, and everyone else seemed to be somewhere else, so I drove here myself.”6. Daisy flew to London to ________.A. see EnglandB. live with her auntC. meet EdmondD. visit a friend7. Before Edmond greeted her, Daisy felt ________.A. anxiousB. curiousC. relievedD. excited8. Edmond waited till everyone was gone before greeting Daisy because _______.A. he did not want to talk to a girl before othersB. he did not get Daisy’s phone callC. he had never seen Daisy beforeD. he was looking for a middle-aged woman9. What did Edmond look like in Daisy’s eyesA. An average 14-year-old.B. A lost dog.C. An old friend.D. A man with dignity.10. Daisy did not make any comment about Edmond smoking because _______.A. she knew all children in England smoke cigarettesB. she thought smoking did harm to one's healthC. the smoking age in England is about twelveD. she did not want to make a fool of herselfPassage threeToday people can use the phone to talk with others almost anywhere on the earth. But when you use the phone, you don’t see the person you are talking with. That may change in the near future.Today some people are using a kind of telephone called the picture phone or vision phone. With it, two people who are talking can see each other.Picture phones can be useful when you have something to show the person you’re calling. They may have other uses in the future. One day you may be able to ring up a library and ask to see a book.Then you’ll be able to read the book right over your picture phone. Or you may be able to go shopping through your picture phone. If you see something in the newspaper that you think you want to buy, you’ll go to your phone a nd call the shop. People at the shop will show you the thing you’re interested in right over the phone. You’ll be able to shop all over town and never even leave your room11. Today people can use the phone to talk with others _______.A. in all the townsB. in some places in the worldC. only in big citiesD. almostanywhere on the earth12. The word “it” in the text means ________.A. the picture phoneB. any phoneC. the useD. the change13. We can _________ through the picture phone accordingto （根据）the text .A. write a bookB. do shoppingC. play gamesD. have classesPassage Four“It’s over Thank goodness ”School was over and I was tired . I sat at the front of theschool bus.Janie , the driver , tries to break the uncomfortable atmosphere（气氛）by striking the match of talks . I try to listen politely,but usually I am too busy thinking about my day. On this day , however ,her talk was worth （值得）listening to .“My father’s ill , ”she said to no one in particular （特别地）. I could see worry in her eyes . I had never seen her likethis before. She always meets students with a smile.With a sudden change of interest, I asked, “What’s wrongwith him ”With her eyes wet and her voice unusual, she answered,“Heart trouble.”Her eyes lowered as she continued. “I’ve already lost my mum, so I don’t think I can stand losing him.”I couldn’t answer. My heart ached for her.I sat on the seat thinking of the great pain （痛苦）my own mother was thrown into when her father died . I saw how hard it was, and still is, for her. I wouldn’t want anyone to go through that.Suddenly I realized （意识到）Janie wasn’t only a bus driver , that was just her job . She had a whole world of family and cares too.I suddenly felt very selfish. I paid no attention to Janie because she was a bus driver. I had judged her by her job and brushed her off as unimportant.I shouldn’t have been so selfish and self-centered.Understanding people is an art.14. When the students get on the school bus , Janie usually ________.A. listens to musicB. talks about her own worryC. sits on her seat without wordsD. meets them with a smile15. In this passage the writer tries to tell us that ______.A. losing parents makes people sad and helplessB. understanding the people around us takes timeC. we should try to look deeper into the people around usD. it’s not right to judge the people a round us by their clothes答案12345678910D B B A D B A C B D 1112131415D A B D C根据下列句子及所给汉语注释．在答题卡相应(de)位置上写出空缺处各单词(de)正确形式.(每空只写一词)(10分)1. The job calls for_________ (耐心) and carefulness,please bear it in mind.2. John told Lucy not to go with us. _________ (很明显) she was disappointed.3. It is vital that we should have a good _________ (知识) of English.4. A new_________ (语言) lab is being built near our teaching building.5. I didn't break the vase on_________ (目(de)),so please forgive me.6. He ate too much, and later he had a_________ (肚子疼).7. There are _________ (千) of factories in this city, among whichare some car factories.8. The next morning, he found his car_________ (被偷).9. _________ (公民) have the rights to vote , nobody can take awaythe rights without good reasons.10. John didn't know the correct______________ (发音) of this word,so he asked me for help.答案： 1.patience 2.Obviously 3. knowledge 4. language5. purpose6. stomachache7. thousands8. stolen9. Citizens 10. pronunciation1. The disease __________（传播）by mosquitoes.2.Are you sitting _______________（舒适）3.They found 46 victims ,including women and children ,all of whomhad _________(冻死) to death.4.He tapped me on my_______________ (肩膀).5.The garden city _____________ (吸引) many tourists.6.Our neighborhood police are very____________ (友善).7.The two buildings are ___________ (相似)on the whole.8.Your face seems ______________ (熟悉(de)).9.He ___________ (提供) me a glass of wine.10.You will be____________（比赛） against the best athletes in theworld .答案：1.spreaded 2. comfortably 3.frozen 4. shoulder 5. attracts6. friendly7. similar8. familiar9. offered 10. competing翻译题1. The teacher says he _____________________(擅长)listening and speaking.(be)2. Li Ming is a funny boy because he loves____________________(讲笑话).(tell)3. The sports shows_______________________(将推迟)because of the rain.(put)4. Now you _______________________(已长大),you should act like a man.(grow)5. We have ______________________（更多(de)空余时间）for our hobbies now.6.You’d better______________________（不戴太阳镜）in the room.7. Mr. Wu is patient enough to spend lots of time ___________________________（为我们讲解）8. Look Some kids are __________ __________（放风筝）on the beach.9. Mrs. Brown is always __________ ___________（对……严格要求）her child in the study.10.Nowadays ,more and more people like going to work _____________________（步行）答案：1. is good at 2. to tell / telling / jokes 3. will be put off 4. have grown up5.more spare time6.not wear sunglass7.explaining things to us8.flying kites9.strict with 10.on foot1.Let’s remember our friendship and keep our dreams alive__________ __________ （永远）2.On National Day,___________ ____________（成千上万）people go to Tian’anmen Square and watch the national flag go up.3. 他家(de)日常开支占总收入(de)30%.The everyday expense ___________ ___________ 30% of the total income of his family .4. 当我到达时,我发现很多人正躺在沙滩上.I found that many people ___________ ___________ on the beach when I arrived there .5. 优质产品总是畅销(de).Products of good quality always ___________ ___________.6. 学生应该独立完成作业.Students should finish their homework ___________ ___________.7. 我不知道我们国家过去是否举办过世博会.I don’t know whether EXPO ___________ ___________ in our country in the past .8. ---What are you going to be _________________（你长大了）---I’m going to be a basketball player . (when)9. Ann is only five years old . She is ______________________（太小而不能上学）.(too)10. I _________________(数学学得好) this term than I did last term . (do)答案：1.for ever2.thousands of3.makes up4.were lying5.sell well6.by themselves7.was held8.when you grow up9.too young to go to school. 10.do better in math作文Is failure a bad thing1. 失败是常有(de)事2. 人们对失败有各种不同(de)态度3. 我对失败(de)态度Private Cars1. 私家车在中国受到了越来越(de)人(de)推崇,越来越多(de)人开始拥有了私家车.2.对于这一现象,有些人持肯定(de)态度,也有些人却反对.3. 你(de)看法.。
非谓语练习题含答案(精华版)
非谓语动词练习1. When he was a boy, he used to go there and watch _____.A. to repair bicyclesB. bicycles to be repairedC. bicycles being repairedD. repairing bicycles2. --- Have you considered _____ your job as a teacher? --- Yes. I like the job because a teacher is often considered _____ a gardener.A. to change; to beB. to change; beingC. changing; beingD. changing; to be3. The dog, _____, will be made a good watchdog.A. to train properlyB. being trained properlyC. properly to trainD. trained properly4. _____ the diamond, he had to look for a place to hide it.A. Having stolenB. Having been stolenC. StolenD. Stealing5. _____ the front door _____, he had to enter the room through the back door.A. Seen; paintedB. Seeing; paintedC. Being seen; being paintedD. Seeing; being painted6. And there, almost _____ in the big chair, sat her little brother, who never had to be told to keep quiet.A. having lostB. losingC. to be lostD. lost7. He looked around and caught a man _____ his hand into the pocket of a passenger.A. putB. to be puttingC. to putD. putting8. To answer correctly is more important than _____.A. that you finish quicklyB. finishing quicklyC. to finish quicklyD. finish quickly9. The old farmer, _____ the badly injured and burnt soldier, came out of the burning farmhouse, calling continuously for help.A. supportingB. having supportedC. being supported byD. being supported10. In January , 2004, the United States successfully launched “Spirit”, a Mars Exploration Rover, _____ a new milestone in the history of mankind.A. it markedB. markingC. markedD. to mark11. It was getting dark; I found a car _____ in a pool by the side of the road.A. to be stuckB. stuckC. stickingD. stick12. You can’t imagine what great trouble they have _____ the problem _____.A. to solve; being talked aboutB. solving; discussingC. to solve; to talk aboutD. solving; being discussed13. The monument was built in honor of the explorer who was believed _____ the river.A. to have discoveredB. to have been discoveredC. to discoverD. having been discovered14. The thief fell to the ground, his left foot _____ and blood _____ down from his mouth.A. breaking; runningB. broken; runningC. breaking; runD. broken; run15. The program was so exciting that the children kept their eyes _____ on the screen.A. to fixB. to be fixedC. fixedD. fixing16. As I will be away for at least a year, I’d appreciate _____ from you now and then so that I can know how everyone is getting along.A. having heardB. to hearC. hearingD. being heard17. _____, the subject was always in my mind.A. Walking or sleepingB. Walking or sleptC. Having walked or sleptD. To walk and sleep18. --- Did you get a dictionary?--- No, I _____, but there were not any _____.A. tried; to be leftB. had tried to; leavingC. tried to; leftD. had tried; have left19. When he came to, he found himself _____ on a chair, with his hands _____ back.A. to sit; tyingB. sitting; tyingC. seating; tiedD. seated; tied20.Nearly every great building in Beijing was built______ south.A.to faceB.facingC.to have facedD.being facing21.With his son _______ , the old man felt unhappy.A.to be disappointedB.disappointingC.being disappointedD.to disappoint22. Henry can’t attend the party _____ at Tom’s house at present because he is preparing the speech at the party _____ at Marie’s house tomorrow.A. held; being heldB. to be held; to be heldC. to be held; heldD. being held; to be held23. Seeing the soldiers well _____ for the flood-fight, the general nodded with satisfaction.A. prepareB. preparingC. preparedD. having prepared24. Don’t worry. I’ll have it _____ and get someone _____ it to you tomorrow.A. typed; sendB. to type; to sendC. type; sendD. typed; to send25. The sun was shining brightly, _____ everything there _____ more beautiful.A. making; lookB. to make; lookedC. and made; lookingD. and making; be looked26. How could he get the plan _____ without any one to support him?A. to carry outB. carry outC. carrying outD. carried out27. New ideas sometimes have to wait for years before _____.A. being fully acceptingB. fully acceptingC. having fully acceptedD. fully accepted28. Having passed all the tests, she felt a great weight _____ off her mind.A. takingB. takenC. takeD. to be taken29. I’m examining the article he has just finished _____ the possible mistakes in it.A. being correctedB. to correctC. correctedD. having corrected30. _____ full preparations, we decided to put off the meeting till next week.A. We did not makeB. Having not madeC. We had not madeD. Not having made31. We should prevent such a silly mistake _____ again.A. occurringB. to occurC. to be occurredD. from being occurred32. I regret _____ hard at school, or I would have succeeded in passing the exam.A. not to workB. having not workedC. to have not workedD. not having worked33. They looked forward with hope _____ a chance to receive further education.A. for gettingB. of gettingC. to getD. to getting34. “Well, I’ll tell you a secret ...” said the boy, with his mouth almost _____ my ear.A. touchedB. touchingC. touchD. to touch35. Towards evening, the patient opened his mouth as if _____ something to his son.A. saidB. sayC. to sayD. to have said36.________ , your composition is full of mistakes.A.Writing carelesslyB.Written carelesslyC.Having written carelesslyD.Being written carelessly37. The beach is so beautiful that it is worthwhile, I think, _____ for a short holiday.A. of goingB. to be goingC. your goingD. you to go38. The teacher asked more _____ to prevent the students’ eyes from being injured.A. to doB. doneC. to be doneD. being done39. Some of the schools in Shanghai have moved one step closer to _____ with the global education community.A. being connectedB. connectC. having connectedD. be connected40. The performance of the host, ___ to please the audience and draw their attention, was greeted with a cold silence, however.A. had intendedB. intendedC. being intendedD. to intend41. _____ and out of breath, we reached the top of the mountain and stopped _____ the beautiful scenery.A. Tiring; to admireB. Being tired; admiringC. Tired; to admireD. Tired; admiring42. The 18-storeyed building, when _____, will shut out the sun _____ up the rooms in my house.A. completed; lightedB. completing; lightingC. completing; lightedD. completed; lighting43. --- I hear Warren _____ in a middle school.--- What? I can’t imagine him _____ as a teacher.A. teaches; workingB. teaches; workC. teach; to workD. teach; working44. _____ he’s only been learning English for a year, he speaks it very well.A. ConsideredB. ConsideringC. Having consideredD. To consider45. It was _____ computer games that cost the boy a lot of time that he ought to have spent on his lessons.A. to have playedB. playingC. playedD. having played46. At no time does the salesgirl get up late in the morning, for she is always too busy _____ a good rest.A. to takeB. takingC. tookD. taken47. _____ as the most excellent student in her university, as most classmates had expected, made her parents very happy.A. Mary was chosenB. Mary chosenC. Mary being chosenD. Mary’s being chosen48. _____ the big snake, the little girl stood under the tree _____ to death.A. Seeing; frightenedB. Seeing; frighteningC. Seen; frightenD. To see; frightening49. You will see this product made in this factory _____ wherever you go.A. to be advertisedB. advertisedC. advertiseD. advertising50. Mr. Green is said _____ an experiment to prove the new method of solving the problem when young.A. to doB. to have doneC. to be doingD. to have been doing答案及部分解析：1-5 CDDAD 6-10 DDCAB 11-15 BDABC 16-20 CACDB 21-25 BDCDA26-30 DDBBD 31-35 ADDBC 36-40 BCCAB 41-45 CDABB 46-50 ADABB1. 用-ing形式一般式的被动语态作宾语补足语，强调自行车被修理的过程。
部编版五年级下册语文第九课《古诗三首》练习题及答案
【导语】要想学习好，死记硬背是远远不够的，多做试题是难免的，这样才能够掌握各种试题类型的解题思路，在考试中应⽤⾃如。
以下是⽆忧考为⼤家精⼼整理的内容，欢迎⼤家阅读。
【篇⼀】部编版五年级下册语⽂第九课《古诗三⾸》练习题及答案 1.看拼⾳写词语。
mán yuàn lí bā wǔ yuè yí hàn mó tiān dà shà （ ） （ ） （ ） （ ） （ ） 2.解释下列加粗词语的意思。
（1）⼀⽚孤城万仞⼭（ ） （2）渭城朝⾬浥轻尘（ ） （3）秋夜将晓出篱门迎凉有感（ ） （4）五千仞岳上摩天（ ） （5）南望王师⼜⼀年（ ） 3.借助注释，说说下⾯诗句的意思，体会它们在表达上的特点。
（1）黄河远上⽩云间，⼀⽚孤城万仞⼭。
______________________________________________________________________ （2）三万⾥河东⼊海，五千仞岳上摩天。
______________________________________________________________________ 4.填空。
（1）《凉州词》的作者是_____代的____________。
诗句“____________________，____________________”写出了戍守边关⼠兵的思乡之情。
（2）《送元⼆使安西》的作者是_____代的____________。
诗句“____________________，____________________”表达了作者对友⼈的依依惜别之情。
（3）《秋夜将晓出篱门迎凉有感》的作者是_____代的____________。
诗句“____________________，____________________”写出了作者对“遗民”的同情以及对南宋朝廷的失望。
勾股定理练习题(含答案)
勾股定理练习题一、基础达标:1. 下列说法正确的是（ ）A.若 a、b、c是△ABC的三边，则a2＋b2＝c2；B.若 a、b、c是Rt△ABC22＝c2；C.若 a、b、c是Rt△ABC a2＋b2＝c2；D.若 a、b、c是Rt△ABC a2＋b2＝c2．2. Rt△ABC3． 如果Rt△的两直角边长分别为k2－1，2k（k >1），那么它的斜边长是（）A、2kB、k+1C、k2－1D、k2+14. 已知a，b，c为△ABC三边，且满足(a2－b2)(a2+b2－c2)＝0，则它的形状为（ ）A.直角三角形B.等腰三角形C.等腰直角三角形D.等腰三角形或直角三角形5． 直角三角形中一直角边的长为9，另两边为连续自然数，则直角三角形的周长为（ ）A．121 B．120 C．90D．不能确定6． △ABC中，AB＝15，AC＝13，高AD＝12，则△ABC的周长为（ ）A．42 B．32 C．42 或 32 D．37 或 3378、在平面直角坐标系中，已知点P的坐标是(3,4)，则OP的长为（ ）A：39．若△ABC中，AB=25cm，AC=26cm高AD=24,则BC的长为（ ）10．已知a、b、c三角形的形状是（ ）A：底与边不相等的等腰三角形 B：等边三角形C：钝角三角形 D：直角三角形11的直角三角形的面积是 ．12. 等腰三角形的腰长为13，底边长为10，则顶角的平分线为＿＿. 13. 一个直角三角形的三边长的平方和为200，则斜边长为14，则按角分类它是 三角形．15. 一个三角形的三边之比为5∶12∶13，它的周长为60，则它的面积是＿＿＿. 16. 在Rt△ABC 中，斜边AB=4，则AB 2＋BC 2＋AC 2=_____．17．则这个三角形三个角度数分别是 ，另外一边的平方是 ．18半圆的面积是 ．19那么它的一条对角线长是 ．二、综合发展:1木条的长．2、有一个直角三角形纸片，两直角边AC=6cm,BC=8cm,现将直角边AC 沿∠CAB 的角平分线AD 折叠，使它落在斜边AB 上，且与AE 重合，你能求出CD的长吗？AC B3高是多少？4．如图，要修建一个育苗棚，棚高h=3m，棚宽a=4m，棚的长为12m，现要在棚顶上覆盖塑料薄膜，试求需要多少平方米塑料薄膜？5．如图，有一只小鸟在一棵高13m的大树树梢上捉虫子，它的伙伴在离该树12m，高8m的一棵小树树梢上发出友好的叫声，它立刻以2m/s的速度飞向小树树梢，它最短要飞多远？这只小鸟至少几秒才可能到达小树和伙伴在一起？15．“中华人民共和国道路交通管理条例”规定：小汽车在城街路上行驶速度处，过了2s后，测得小汽车与车答案:一、基础达标1. 解析:利用勾股定理正确书写三角形三边关系的关键是看清谁是直角．答案: D.2. 解析：本题考察三角形的三边关系和勾股定理.答案：B.3． 解析：设另一条直角边为x，则斜边为（x+1）利用勾股定理可得方程，可以求出x．然后再求它的周长.答案：C．4．解析：解决本题关键是要画出图形来，作图时应注意高AD是在三角形的内部还是在三角形的外部，有两种情况，分别求解.答案：C.5． 解析: 勾股15，所答案6． 解析：本题目主要是强调直角三角形中直角对的边是最长边,反过来也是成立．答案7． 解析:本题由可知满足勾股定理，即是直角三角形．答案：直角．断定是直角三角形．答案：9． 所以以直角．答案：π．10． 解析×宽，即12长×所以一条对角线长为5．答案11． 解析：木条长的平方=门高长的平方+门宽长的平方．答案12解析：所由直角三角形面积关∴答案：12cm13．解析：透阳光最大面积是塑料薄膜的面积，需要求出它的另一边的长是多少，可以借助勾股定理求出.答案：在直角三角形中，由勾股定理可得：直角三角形的斜边长为5m,所以矩形塑料薄膜的面积是：5×20=100(m2) ．14．解析：本题的关键是构造直角三角形，利用勾股定理求斜边的值是13m，也就是两树树梢之间的距离是13m，两再利用时间关系式求解.答案：6.5s．15．解析：本题和14题相似，可以求出BC的值，再利用速度等于路程除以时间后比较.BC=40米，时间是2s，可得速度是20m/s=72km/h答案：这辆小汽车超速了．勾股定理练习题一、填空题（每空3分，共24分）1、若直角三角形两直角边分别为6和8，则斜边为___________；2、已知两条线的长为5cm和4cm，当第三条线段的长为_________时，这三条线段能组成一个直角三角形；3、能够成为直角三角形三条边长的正整数，称为勾股数。
第四章习题答案
一、填空题1.几何公差的形状公差有6项,它们的名称和代号分别是（直线度）、（平面度）、（圆度）、（圆柱度）、（线轮廓度）和（面轮廓度）。
2.几何量公差的跳动公差有2项,它们的名称和代号分别为（圆跳动）和（全跳动）。
3．端面对轴线的垂直度（小）于端面圆跳动。
4．某轴尺寸为Φ10-0.018-0.028 mm ，轴线对基准A 的垂直度公差为Φ0.01 mm ，被测要素给定的尺寸公差和几何公差采用最大实体要求，则垂直度公差是被测要素在（最大实体状态）时给定的。
当轴实际尺寸为（Φ9.972）mm 时，允许的垂直度误差达最大，可达（0.02）mm 。
5.独立原则是指图样上给定的（尺寸）公差与（几何）公差各自独立，分别满足要求的公差原则。
6．包容要求采用（最大实体）边界，最大实体要求采用（最大实体实效）边界。
7．某孔尺寸为Φ40+0.119 +0.030○E mm ，实测得其尺寸为Φ40.09mm ，则其允许的几何误差数值是（Φ0.06）mm ，当孔的尺寸是（Φ40.119）mm 时，允许达到的几何误差数值为最大。
8．某孔尺寸为Φ40+0.119+0.030mm ，轴线直线度公差为 Φ0.005 mm ，实测得其局部实际尺寸为Φ40.09mm ，轴线直线度误差为Φ0.003mm ，则孔的最大实体尺寸是（Φ40.030）mm ，最小实体尺寸是（Φ40.119）mm ，体外作用尺寸是（Φ40.087）mm 。
9．若某轴标注为则该零件的MMS 为（φ30mm ），又称为该零件的（最大）极限尺寸；其LMS 为（φ29.979mm ），又称为该零件的（最小）极限尺寸；零件采用的公差要求为（最大实体要求），若加工后测得某孔的实际尺寸为φ29.98mm ，直线度误差为0.015mm ，则该零件（是）（是、否）合格。
10．若某孔的尺寸标注为，则该零件采用的公差原则为（最大实体要求），其MMS 为（Φ20mm ），此时的几何公差值为（Φ0.02）mm ；其LMS 为（Φ20.05mm ）mm ，此时的形位公差值为（Φ0.07）mm ；其MMVS 为（Φ19．98）mm 。
基础化学练习题(有答案)
复习思考题一一、 填空题1．5.0g ·L -1的硼酸（H 3BO 3）溶液，其物质的量浓度为0.081 mol ·L -1。
2．不同基本单元的高锰酸钾溶液，其浓度关系为c （KMnO 4）= 0.2 c （51KMnO 4）。
4．产生渗透现象的两个必要条件是 有半透膜 和 存在浓度差 。
5．25℃时，已知难溶电解质MX 2的溶度积为K sp ，溶解度为S ，其K sp 与S 的关系为 （Ksp / 4）^（1/3） 。
6．在水溶液中有Ac -、HCO 3-、H 2O 、NO 2-、HS -、CO 32-、H 2S 、H 2PO 4-、PO 43-、HCN ，根据质子理论，能作酸不能作碱的有 H2S 、 HCN；能作碱不能作酸的有 Ac- 、NO2-、CO32-、 PO43 ；既能作酸又可作碱的有 HCO3- 、H 2O 、 HS-、H2PO4- 。
7．在HAc 溶液中加入NaAc ，HAc 的解离度将会 减小 ，这种现象称为 盐 效应。
8. 已知HAc 、H 2PO 4-和NH 4+的p K a 分别为4.76、7.21和9.25。
若欲配制与正常人血浆pH 相同的缓冲溶液，应选用的缓冲系为 H2PO4- 、HPO42- ，其中抗酸成分是 HPO42- 。
9．用一级标准物质Na 2B 4O 7·10H 2O 标定HCl 溶液的浓度时，滴定反应式 为_ Na2B4O7(aq)+_HCl （aq ）+5 H2O （l ）===4H3BO3+2NaCl （aq ）_______，化学计量点时计算[H +]的公式为 -0.5log(Ka* C) ，可以选择 甲基红 为指示剂。
10．下列数据：0.00841、1.24×10-5、0.0020、1000和pH=10.50的有效数字位数分别是 3 、 3 、 2 、 4 和 2 。
11.用Na 2C 2O 4作一级标准物质标定KMnO 4溶液,标定是时要添加__硫酸___ 以维持溶液的酸性，不能用盐酸，因 高锰酸根会氧化氯离子 ；也不能用硝酸，因硝酸会氧化草酸根。
收入练习题及答案
收入杨慧辉一、单项选择题1、企业销售多余原材料和包装物的收入，应通过（）账户核算。
A、主营业务收入B、其他业务收入C、营业外收入D、投资收益2、企业下列活动形成的经济利益的总流入中，不属于收入的是( )。
A、工业企业对外出售不需用的原材料B、商业企业对外进行权益性投资(取得现金股利或利润)C、商业企业处置无形资产D、咨询公司对外进行债权性投资(取得利息)3、企业发生的违约金支出应计入（）账户核算。
A、其他业务支出B、管理费用C、财务费用D、营业外支出4、( )的特征将收入与利得区别开来。
A、收入会导致企业所有者权益的增加B、收入与所有者投入资本无关C、收入会导致企业资产的增加或负债的减少D、收入形成于企业日常活动5、结转已销售产品的成本，应借记“主营业务成本”账户，贷记（）账户。
A、生产成本B、制造费用C、库存商品D、应付账款6、销货方为了尽快回笼货款而给予购货方的债务扣除称为（）。
A、现金折扣B、商业折扣C、销售回扣D、销售折让7、销售商品应由销货方承担的销售税金，应借记（）账户。
A、应交税费B、应收账款C、管理费用D、营业税金及附加9、某企业销售商品一批，不含税售价20000元，商品已发出，付款条件为：2/10，1/20，n/30，购货单位40天后支付货款，可享受的现金折扣为（）元。
A、0B、200C、400D、60013、企业生产经营期间因银行存款而产生的利息收入应贷记( )科目。
A、财务费用B、营业外收入C、在建工程D、长期待摊费用14、某企业取得的下列各项收入中，不属于让渡资产使用权所取得的收入的是( )。
A、债券利息收入B、出租土地使用权而取得的租金收入C、出租厂房而取得的租金收入D、出售无形资产而取得的价款二、多项选择题1、企业下列各项活动不会形成企业收入的有( )。
A、受托方代收代交的消费税B、因销售商品而向客户收取的增值税销项税额C、处置无形资产D、因其他企业违约收取罚款2、企业确认商品销售收入必须同时符合（）条件。
综合练习题及答案
综合练习题及答案综合练习题二一、单选题1、在物流领域采取的，直达运输、联合运输、看板、实行按专门路线配送（货运专线运输）等管理和技术，是__________目标的体现。
A、范围经济B、规模经济C、速度经济D、客户满意2、物流系统通过准点供货以满足生产企业“_____________”生产的要求。
A、速度经济B、产量增加C、零库存D、产量增加3、我国常用的流通加工主要形式有：剪板加工、集中开木下料、燃料掺配加工、冷冻加工和_________等。
A、产品加工B、精制加工C、配额加工D、库存加工4、一个完整的物流实体网络至少要包括__________和物流结点。
A、物流企业B、物流线路C、物流网络D、物流信息5、销售物流的起点，一般情况下是生产企业的__________________。
A、生产车间B、运输车辆C、原材料仓库D、产成品仓库6、对供应链管理的运作进行高效管理，可以确保围绕着企业的________目标，将所有的工作职能优化，并为客户创造价值。
A、战略B、战术C、长远D、利润7、全球物流活动中大量的贸易合同和文书涉及运输、报关、___________结算等方面。
A、保险B、登记C、装卸D、信息8、许多物流企业把自己的智能和资源集中在自己的核心竞争优势的活动上，而把非核心领域___________给其他专业企业。
A、内包B、外包C、归口D、并购9、ISO中央秘书处及欧洲各国已基本认定的物流基础模数尺寸为___________。
A、600×1500（毫米）B、600×400（毫米）C、1200×1000（毫米）D、1200×800（毫米）10、以下项目中不是物流中心功能的是________________。
A、运输功能B、包装功能C、出售功能D、流通加工功能二、多选题1、物流作为涉及多部门、多功能活动的集成，具有的特性有__________。
A、系统性与客观性B、大跨度性与动态性C、中间层次性与复杂性D、效益背反与网络经济性2、由_______和_______形成的区域性物流网络形成地区发展的“点…轴”开发效应。
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（练习3）解：（1）设抛物线为y=a（x-4）^2-1，
∵抛物线经过点A（0，3），
∴3=a（0-4）^2-1，a=1/4；
∴抛物线为y=1/4(x-4)^2-1=1/4x^2-2x+3
（2）相交．
证明：连接CE，则CE⊥BD，
当1/4(x-4)^2-1=0时，x1=2，x2=6．
A（0，3），B（2，0），C（6，0），
对称轴x=4，
∴OB=2，AB=√(2^2+3^2)= √13
BC=4，
∵AB⊥BD，
∴∠OAB+∠OBA=90°，∠OBA+∠EBC=90°，
∴△AOB∽△BCE，
∴AB/BC=OB/CE ，即√13/4=2/CE ，解得CE= 8√13/13，
∵8√13/13＞2，
∴抛物线的对称轴l与⊙C相交
（3）如图，过点P作平行于y轴的直线交AC于点Q；
可求出AC的解析式为y=1/2x+3
设P点的坐标为（m，1/4m^2-2m+3）
则Q点的坐标为（m，-1/2m+3）
∴PQ=-1/2m+3-（1/4m^2-2m+3）=-1/4m^2+3/2m．
∵S△PAC=S△PAQ+S△PCQ=1/2×（-1/4m^2+3/2m）×6
=-3/4（m-3）^2+27/4；
∴当m=3时，△PAC的面积最大为27/4；
此时，P点的坐标为（3，-3/4）
,(练习2) （1）∵点B(-2,m)在直线y=-2x-1上，
∴m=-2×(-2)-1=3.
∴B(-2,3)
∵抛物线经过原点O和点A，对称轴为x=2，
∴点A的坐标为(4,0) .
设所求的抛物线对应函数关系式为y=a(x-0)(x-4).
将点B(-2,3)代入上式，得3=a(-2-0)(-2-4)，∴.
∴所求的抛物线对应的函数关系式为，即 .
（2）①直线y=-2x-1与y轴、直线x=2的交点坐标分别为D(0,-1) E(2,-5). 过点B作BG‖x轴，与y轴交于F、直线x=2交于G，
则BG⊥直线x=2，BG=4.
在Rt△BGC中，BC= .
∵CE=5，
∴CB=CE=5.
②过点E作EH‖x轴，交y轴于H，
则点H的坐标为H(0,-5).
又点F、D的坐标为F(0,3)、D(0,-1)，
∴FD=DH=4，BF=EH=2，∠BFD=∠EHD=90°.
∴△DFB≌△DHE （SAS），
∴BD=DE.
即D是BE的中点. …………………
（3）存在.
由于PB=PE，∴点P在直线CD上，∴符合条件的点P是直线CD与该抛物线的交点.
设直线CD对应的函数关系式为y=kx+b.
将D(0,-1) C(2,0)代入，得 . 解得.
∴直线CD对应的函数关系式为y= x-1. ∵动点P的坐标为(x，)，
∴x-1= .
解得， . ∴， .
∴ 符合条件的点P的坐标为( ， )或( ， ).。