exercises05_an
最新Exercises
ExercisesC omplete the following sentencesPart One1. 除了去公园之外,我的活动范围仅限于邻近地区。
(apart)_____________________________, I limit my movements to my neighbourhood.2. 没有足够的证据很难作出结论。
(evidence)It is difficult to draw a conclusion _________________________________.3. 这些科学的探寻将有助于我们项目的成功。
(contribute)These scientific enquiries _________________________the success of our project.4. 居斯特夫·埃菲尔对他修建铁塔的计划满怀热情,而这座塔使他闻名于世。
(enthusiastic)Gustave Eiffel _____________________his plan to construct the iron tower, which made him world-famous.5. 他常提出些不寻常的计划。
你在加入之前要慎重对待。
(put)He often ____________________________, so be cautious about them before you join in.6. 谁是第一个反对“地心说”的人?(reject)Who _________________________________ the idea that the earth was the centre of the universe?7. 虽然他的写作没什么意思,但弗雷德还是确信自己的作文会得高分。
(sense)Although his writing ________________ , Fred is positive that his composition will score a high mark.8. 大卫·贝克汉姆到达日本时,兴奋的球迷们都赶过去迎接。
exercise的兼类词
exercise的兼类词一、exercise用作名词。
1、作可数名词。
意思是“锻炼、练习题”的意思,往往用它的复数形式,即exercises。
比如:We should do morning exercises every day.我们应该每天做早操。
We should do some exercises this weekend.这个周末我们应该做一些练习题。
在这两句当中,我们知道exercise是用作可数名词的复数。
2、exercise用作不可数名词,泛指“锻炼、运动、练习”等意思。
比如:Let's take exercise.让我们一起来锻炼锻炼吧。
这句话中的exercise是一个不可数名词,不可以加S。
再如Please do another exercise after you finish this one.在完成你的这一道题目之后,请做下一道练习。
这儿的exercise它的意思是不可数名词,泛指“这个练习”。
二、exercise用作动词。
意思是表示“训练、锻炼”。
举例来说。
His brother exercises every day.他的兄弟每天都做锻炼。
这里的exercise是动词,由于它的主语his brother是单数第三人称,所以我们在后面加上s,变成exercises。
三、exercise常见的形式。
1、主语是单三、可数名词的复数形式:用exercises。
2、现在分词:用exercising。
3、过去式、过去分词:用exercised。
EXERCISES FOR NOUNS
EXERCISES FOR NOUNSI.Multiple choice:1.__can get a better view of the gam e than the participant.A.Lookers-onB.Look-onC.Looker-onD.Lookers-ons2.When you are at __end,you should not lose your head.A.wit’sB.deadC.your wit’sD.extreme3.Our teacher gave me___.A.an adviceB.the advicesC.many advicesD.much advices4.Recently, he has lost all his __.A. wage and saving at cardB. wages and saving at cardC.wages and savings at cardsD. wages and saving at card5.___ was wonderful so that it attracted all the students in the class.A. The teachers’ performanceB.That performance of the teachers’C.That performance of the teachersD. The performance of the teachers’6.They bought __ for the living room.A. some new furnitureB.som e new furnituresC.many new furnitureD.much new furnitures7.Although I’m inferior to you, you shouldn’t put on __ with me.A.facesB. airsC.airD. face8.Although the town had been attacked by the storm several times, __ was done.A. a few damagesB. few damagesC.little damageD. a little damages9.Though he was in college, he was still fond of reading ___.A. stories of childrenB.children storiesC.children’s storiesD.childrens’ stories10.Would you like to have a cup of tea and __ with me?A.two piece of toastB. two piece of toastsC. two toastsD. two pieces of toast11.Mr. Wang has a ___ daughter.A.three-years-oldB. three years’ oldC. three-year-oldD.three-year old12.No country can afford to neglect___.A. an educationcationsC. educationD.the education13.He invited all his __ to join in his wedding party.rade-in-armsB. comrade-in-armC. comrades-in-armsD. comrades-ins-arms14.One of the most surprising things is that ___ may com e from petroleum.A.much of tomorrow’s foodB. much of tomorrow foodC. much of the food of tomorrowD. many of tomorrow’s food15.__telephoned this morning.A.My father’s friendB.A friend of my fatherC.A friend of my father’sD.My father friend16.__ is too much for a little boy to carry.A.A bike’s weightB.Bikes’ weightC.The weight of a bikeD.The weights of bikes17.The news of victory __ spreading far and wide.A.have beenB.areC.wereD.is18.The Chinese people __ a great people.A. areB. isC. can beD. has been19.These books, which you can get at any bookshop, will give you ___ you need.A.all the informationB.all of informationC.all the informationsD.all of the info rmations20.That magnificent __ temple was constructed by the Chinese.A. eight-centuries-oldB. old-eight-centuriesC. eight-centurie’s-oldD. eight-century-old21.Could you please tell me the __ for Biology 457 and Chemistry 610?A.room’s numbersB. room numbersC.rooms numbersD.numbers of rooms22.The Niagara Falls __ great fame in the world.A.enjoyB.enjoysC.isD. are23.There was ___ of complete silence.A. an instantB. hoursC.three minutesD.seconds24.As a safety precaution, all city cab drivers carry only enough money to make change for a __ bill.A. ten-dollarB. ten-dollarsC.ten-dollar’sD.ten dollars25.The police incestigated those __ about the accident.A.stander-bysB.standers-bysC.stander-byD.standers-by26.” What does Roger Brown do for a living?”“He’s one of the most successful __ in the city”.A. newspaper reporterB.newspaper’s reporterC.newspaper’s reportersD.newspaper reporters27.Photographic film is made n __ and widths.A. variety is the lengthB.the length is variedC.a variety of lengths C.it has varied lengths28.” What did you buy today, Bruce?”“ I bought __ .”A. two bag of riceB. two sacks of riceC. two dozen riceD. two rices29.He bought __ for his father in a drugstore.A. some medicineB.some medicinesC.many medicineD.enough medicines30.The people present at the meeting are___ .A.mathematic teachersB.mathematic’s teachersC.mathematics teacherD.mathematics teachers31.Many __ prefer to use the word “Ms.” Instead of “Miss” or “Mrs.” before their nam es in business correspondence.A.woman managersB.woman managerC.women managersD.wom en manager32.We’ll go to the sea for ___ .A. a holiday monthB. a holiday of a monthC. a month ho lidayD.a month’s holiday33.The invention of various __ promotes the exploration of outer space.A.spacecraftsB.aircraftsC.spacecraftD.aircraft34.These deer __ small compared with other species of deer.A. areB.doC.isD.does35.He is a dangerous man. You’d better keep him at __ length.A. an elbow’B.arm’sC.greatD.an arm’s36.Please give my best __ to your parents.A.regardsB.regardC.rememberD.remembrance37.They had made ___ for the evening party before I came.A.preparationB.arrangementC.arrangementsD. agreement38.After four years in America, he got ___ .A.a degree of doctorB.a doctor’s degreeC.the degree of a doctorD. a doctor degree39.There are more than four ___ in this university so that some students can play the piano.A.pianoB.pianosC.pianoesD.a pianoII.Error correction1.All the passer-bys were shocked at the sudden accident.A B C D2.The students at colleges or universities are making preparation for the coming New Year.A B C D3.The doctor checked up both Wang’s father’s-in-law and his brother-in-law’s hearts.A B C D4.Cliff’s and Al’s car broke down again, but luckily the knew how to fix it.A B C D5.He has only a two-weeks vacation during the year despite the fact that other workers get more time off.A B C D6.Jim was late for two classes this morning.He said that he forgot both of the room’s numbers.A B C7.Following the holiday weekend, the director discovered to his shock that a large part of the laboratoryA B C costly new equipments had been removed.D8.Since World War II, the pace of medical discoverer has quickened, spurred by billions of dollars inA B C Dfederal aid.9.With the development of production, the price of cabbage , butter and sausage are gradually goingA B C Ddown.10.Electronics are his most difficult subject and he is worried that he won’t pass the exam.A B C D11.Among those present are neighbors: the Hendersons, the Weiss and the Harlowes.A B C D12.On a summer evening, a birthday celebration is going on at Dr. Stockton.A B C D13.The article deals with the natural phenomenon which are most interesting to everyone.A B C D14.Even though the average women possesses less physical strength than the average man, she isA B C Dbelieved to have greater stumina.15.When he found his bike had been stolen, she hurried to a police for help.A B C D16.If you want to return this pair of slippers to the shop you can ask sale manager for help.A B C D17.The news of the losses suffered by our troops were much worse than expected.A B C D18.All the woman doctors were shocked at the unexpected accident.A B C D19.Such is the general purport of this legendary superstition, which has inspired many a wild stories inA B C D that region.20.We might say that the earliest tools were a means of extending the human being own bodily powers.A B C DKey:I1-5 ACDCB 6-10 ABCCD 11-15 CCCAC 16-20 CDAAD 21-25 BAAAD26-30 DCBAD 31-35 CDCAB 36-39 ACBBII1.B passers-by2.C preparations3.C father-in-law’s4. A Cliff and Al’s5.A two-week6.D the room numbers7.D equipment8.B discovery9.B the prices 10.A is 11.C the Weisses 12.D the Dr. Stockton’s13.B phenomena 14.B woman 15.C police 16.D sales17.B was 18.A women doctors 19.C story 20.C the human being’s。
上海交通大学英语讲义Exercise Five听力答案及原文
Exercise Fivepound DictationI believe in toughness,steeliness and even meanness.I learned these(1)traits from my father.Toughness came first.I am the first-born and the son he never had.I’m the one he took to the gym,the one who could run faster than the boys,the one who played all day with a broken collarbone(锁骨).I’m the one who thought my daddy was the toughest man around—and I wanted to be just like him.He never missed a day of school,worked as a dishwasher to pay his college(2)tuition,and toiled as an accountant by day and attended law school at night.My dad also taught me steeliness,an unwillingness to(3)surrender.Steeliness kept me from being raped once.I fought my attacker.I left an imprint of my phone on his face.I(4)memorized details of his face and clothing.Determined to keep other women from being violated,I identified him,testified against him and made sure he went to jail.Sometimes even toughness and steeliness aren’t enough.I also believe in meanness.I am not a large woman;petite,in fact.I cannot command respect with my presence and stature. As a(5)community college English instructor in a tough town,I teach people who aren’t always eager to learn.I’m the mean teacher.I like to push students harder than they want to be pushed. Some of them don’t like me at the time,but they usually end up(6)appreciating me later on.“Hate me now,love me later”is my motto.I’m even mean with myself.Sometimes it’s meanness that gets me out of bed in the morning,like after a night of drinking too much.I’m not nice to myself—I don’t give myself(7)permission to stay home.Some of my best teaching days have been the result of my refusal to make others suffer for my poor(8)self-discipline.Meanness with myself keeps me accountable.That tough and steely will my father gave me helps me bear the loss of him.(9)I watched him die of cancer,but he never gave up on wanting to live.(Please pause here for30’’-40’’)Perhaps it would have been easier on both him and the family had he given in to death,had he not fought to the absolute last breath.(10)Although I do not have him in my life anymore,I got to see him as himself to the very end of his.(Please pause here for30’’-40’’)I understand the poet Dylan Thomas,who pleads with his own father to“rage,rage against the dying of the light.”Women are usually encouraged to be gentle.But when life has tested me the most,(11)I believe it’s my toughness,my steeliness and even my meanness that get me through.(Please pause here for30’’-40’’)Section2.Note-taking1)successful movie actress(for many years starting)2)star of a very popular radio program3)radio performer4)I love Lucy/TV show5)housewife6)to be in show business7)soft and pretty8)mean9)Cuba immigrant10)a bandleader(in a New York nightclub)Section3.Short Answering Questions.We might not be alone in the universe.Actually,it may be confirmed as a very crowded place by new computer models developed to help identify habitable planets.Estimates of places that can sustain life have been based on the likelihood of them having surface water.But software recently developed by the Aberdeen University allows researchers to identify planets with underground water kept liquid by planetary heat.Water is fundamental for life and planets too close to the sun lose water to the atmosphere through evaporation.On the other hand,planets located in distant reaches from their star have their surface water locked away as ice.Sean McMahon,who is carrying out the work,explained:“Traditionally people have said that if a planet is in this Goldilocks zone–not too hot and not too cold-then it can have liquid water on its surface and be habitable.”But this perception might change when considering that planets can receive two sources of heat-heat direct from the star and heat generated deep inside the planet.It is easy to observe it in our own planet.As you descend through the crust of the Earth,the temperature gets higher and higher.Even when the surface is frozen,water can exist below ground. There could be5.immense quantities of water in fact-teeming with primitive life.Professor John Parnell,also from Aberdeen University said:“There is a significant habitat for5. microorganisms below the surface of the Earth,extending down several kilometres.”“And some believe that the bulk of life on Earth could even reside in this deep biosphere.”So the Aberdeen team are developing models to predict which far-flung planets might harbour underground reservoirs of liquid water with the possibility of alien life.Section4.Listening and Translation1.As the human population has grown and become wealthier,the demand for high-quality animal protein has skyrocketed.For example,from1990to2005,Asia alone added roughly one billion humans,but10billion chickens,according to UN figures.Farmers are raising more animals in smaller spaces than in the past and in places that have not been used this way before.例如,根据联合国的统计数字,从1990年到2005,仅亚洲大约增加了10亿人口,但鸡却增加了100亿只。
05网英语课课练答案
05网英语课课练答案Unit 1: Internet and Social MediaExercise 11. A2. C3. A4.They can connect with friends and family, share photos and videos, and discover new content.5.True6.False7.posting updates, sharing photos and videos, commenting on other people’s posts, liking or reacting to posts8.Social media can also be used for professional purposes, such as promoting businesses, networking with industry professionals, and sharing industry-related news and insights.Exercise 21.social media2.Internetworking4.personal information5.virtual6.online7.sharing8.privacyUnit 2: Technology and GadgetsExercise 11. B2. A3. C4. A smartphone is a mobile device that combines the functions of a phone, a computer, and other multimedia features, while a laptop is a portable computer with a built-in keyboard and monitor.5.True6.False7.touchscreens, internet connectivity, built-in cameras, social media applications, mobile gaming8.personal and professional communication, entertainment, productivity, navigation, photography, gamingExercise 21.smartphoneptop3.tablet4.smartwatch5.headphones6.gaming console7.camera8.fitness trackerUnit 3: Online LearningExercise 11. B2. C3. A4.Online learning allows students to access educational resources and materials from anywhere and at any time, offers flexibility in scheduling, promotes self-paced learning, and provides opportunities for interaction and collaboration with teachers and peers.5.True6.False7.video lectures, online quizzes and assignments, discussion forums, live virtual classes, virtual labs8.continued education and lifelong learning, access to a wide range of courses and instructors, opportunities for self-improvement, cost-effective alternative to traditional educationExercise 21.online learningcational resources3.flexibility4.self-paced5.interaction6.collaboration7.video lectures8.discussion forumsUnit 4: CybersecurityExercise 11. A2. B3. C4.Cybersecurity is the practice of protecting computers, servers, mobile devices, electronic systems, networks, and data from unauthorized access, attacks, and damage.5.True6.False7.strong and unique passwords, two-factor authentication, regular software updates, antivirus and firewall protection, safe browsing habits8.Protecting personal and sensitive information, preventing identity theft and financial fraud, safeguarding business and customer data, maintaining the integrity and availability of systems and networksExercise 21.cybersecurity2.unauthorized access3.attacks4.data5.passwords6.authentication7.software updates8.antivirusUnit 5: Online ShoppingExercise 11. B2. C3. B4.Online shopping allows customers to conveniently browse and purchase products and services from their homes or any location with an internet connection, offers a wide selection of products, provides competitive prices and discounts, and allows for easy price comparison.5.True6.False7.online marketplaces, e-commerce websites, search engines, customer reviews and ratings, secure payment options8.Convenience, wider product selection, competitive prices, easy pricecomparison, access to customer reviews and ratings, secure payment options Exercise 21.online shopping2.browse3.purchase4.internet connection5.selectionpetitive prices7.price comparison8.customer reviewsConclusionThis document provides the answers to the practice exercises in Unit 1 to Unit 5 of the online English course。
Exercises For Unit5
Exercises For Unit5一.汉译(一)短语 1.做运动_______ _________ 2.打篮球________ _____________3.踢足球_______ ________ 4.打网球________ ___________ 5.打排球_________ ____________6.打电子游戏______ _____________ ________7.一个有趣的游戏_______ ____________ _________ 8.一些足球________ _______ ______ 9.很多体育俱乐部_______ __________ __________ 10.两个网球拍______ _________ _________ 11.三个乒乓球拍_______ ___________ _________ 12.四个棒球拍_____ ______ ________ 13.五块手表______ ____________ 14.六本词典_______ _____________ 15.七张画片________ ____________ 16.八个女孩________ __________ 17.一项令人放松的运动_____ _________ _____________18.每天________ ________ 19.每天上午________ __________ 20.每天下午_________ ______________ 21.每天晚上_________ ____________ 22.看电视_________ _________ 23.在电视上看体育运动________ __________ ______ _______24.加入篮球俱乐部______ ______ _____________ ________25.有许多体育收藏______ ______ ________ ________ ______________26.上课______ _________27.成为好朋友______ ________ ______________28.带它到学校来________ ______ _____ ___________29.把它们带到你姐姐那里去________ ________ _____ ________ __________30 带这些手表给他们_______ ________ _________ _____ ________ 31. 我的全家福照片______ ___________ __________= a ________ _______ my _________32.谢谢你的全家照__________ ______ your _________ __________33.一套钥匙_____ _______ ______ _________34.打8260358找Jim_______ Jim ______ 8260358 35.一个闹钟______ ________ __________(二)句子:1.我有两个足球I________ two________ __________.2.他有三个棒球He________ three_____________.3.我们有许多朋友We_______ _______ ___________.4.他们有一些图片They_________ __________ _______________.5.吉姆有两个网球拍Jim _______ two___________ _____________.6.你有一个电子游戏吗_________ you ________ a _____ ___________?7.我没有一个排球I________ ________ a _____________.8.她有篮球吗?________ she_______ a ____________?不,她没有,但她有排球No._______ _________, but she_________ a _____________9.他能打篮球He________ __________ ______________.10.他们有一些漂亮的手表They_________ __________ nice____________.11.让我们一起做运动吧___________ ___________ ____________.12.那听起来不错_________ ________ __________.13.我们有许多运动俱乐部We__________ _________ __________ ________14.我想参加足球俱乐部I_________ ______ __________ the_________ ___________.15.早上我们上四节课We_________ four__________ ______ the__________.16.我们在七年级三班We________ ________ _________3, Grade7.17.这是一个有趣的游戏This is____ ______________ __________.18.英语很有趣,但它也很难English is___________,but it’s ____________.19.看电视很无聊____________ _______ is___________.20.他有大量的运动收藏品He_______ a ________ __________ _____________.21.让我们在电视上看这个乒乓球赛吧_________ ___________ the____________ ____________ _______ TV. 22.他每天都做运动He_________ _________ _________ day.23.他不打排球,他只打篮球He_____ __________ ___________,he________ ______ _____.24.我喜欢篮球和足球,但我不喜欢棒球和网球I ________ _____________ and ______________, ________ I _________ __________ _____________ _______ __________.25.你们有数学书吗?有______ you_______ a ________ _________? Yes,_______ _______.26.你的阿姨有网球拍吗?_______ your ant_________a ___________ _____________? 不,她没有,但是她有棒球拍No,_______ ___________.But she_______ a ___________ _____. 27我的同学没有闹钟,他只有手表My classmate_________ __________ ________ alarm clock. He only________ a watch.28. 我们来踢足球吧,那很有趣________ _________ soccer. That_________ ___________.29.很多人都不做运动。
Exercises
EXERCISESI. Match the following items and the text. They refer to preparing and sending the paper.1. Choice of the journal ………………………….2. Guidelines …………………………3. Length of the paper …………………………4 . Cover letter ………………………….5. Declaration ………………………….6. Confirmation of receipt ………………………….7. Review process ………………………….a) The usual length of a paper is about 6,000 to 9,000 words, i.e., about 6 to 9 pages (however, mathematics papers can be longer). Do not exceed this figure because some journals may return the paper for shortening. One journal page = 1,000 words.b) The journal´s editor will confirm that the contribution has been received and will forward it to a reviewer who will then judge the quality of the paper and often also your English.c) Almost all journals now appear also in electronic form. Your supervisor will know which journal in your field is the most suitable for you. You can also find one when searching for papers by keywords. However, not all the papers you find in this way give the name of the journal.d) All journals inform about their publication policy on their web pages. They give detailed information to authors on how to prepare a paper for submission and even offer a form/template for electronic submission.e) Some journals will publish a paper only if a statement is attached saying that the paper presents an original contribution to the researched problem and that the facts have not been published elsewhere. (See Exercise XXXIV.)f) To submit the paper, check if the journal accepts papers only in electronic form (which is becoming prevailing practice) or if a hard copy is to be sent as well. It is polite to accompany the paper with a short cover letter (sometimes a blank space is left on the submission form). (See also Guidelines for Academic Writing: How to write a formal letter).g) After the paper has been peer-reviewed, you will most probably be asked to revise some sections or parts and to work on your English, i.e. correct language errors, change some formulations or even the style, as required by the journal. When you have done that, send the paper back and wait for the announcement that it has been accepted for publication. TitleII. What errors can you find in the following titles?1. Water-Cooled Nuclear Power Plants Aren´t the Solution.2. The Burn-up Calculations of the Dukovany and Temelín Nuclear Power Plant Fuel for the Independent State Monitoring System in the Czech Republic.3. Why Are The Wavelength And Delivery Systems The Most Important Factors In using A Dental Hard-Tissue Laser?Ad 1. ……………………………………………………………………………………………………………………………………. Ad 2. …………………………………………………………………………………………………………………………………….. AD 3. …………………………………………………………………………………………………………………………………… Author´s /Authors´ names and AffiliationsIII. Choose a topic from your present research on which you would like to write a paper. Think about what you would like to call it and whom you would like to have as co-authors/a co-author. Following the advice given above, give the title of your paper, authors´ names and affiliations, and contact address.AbstractIV. Fill in verbs in the tense and voice (active/passive) appropriate in the given context.1. Dynamic Behavior of the Doubly Fed Induction Generatorduring Three-Phase Voltage DipsThe use of doubly fed induction generators (DFIGs) in large wind turbines …………………………………….. (become) quite common over the last few years. These machines ………………………………. (provide) variable speed and …………………………………. (drive) with a power converter which is sized for a small percentage of the turbine-rated power. A drawback of the DFIG …………………………….. (be) that it ………………………………. (be) very sensitive to grid disturbances, especially to voltage dips. However, the operation of this machine in these situations ………………………………… only ………………………….. (study) in the literature by means of simulations. This paper ……………………………….. (develop) a theoretical analysis of the dynamic behavior of the induction machine during three-phase voltage dips. The proposed analysis …………………………………….. (contribute) to understanding the causes of the problem and …………………………………….. (represent) a very useful tool to improve the existing solutions and propose new alternatives. Experimental results ………………………………….. (be) in good agreement with those obtained theoretically and …………………………………. (validate) the proposed analysis.(From IEEE Transactions on Energy Conversion, vol. 22, no. 3, Sept. 2007, p. 709)2. Phthalocynanine Layers for Humidity DetectionThis study ………………………………… (deal) with research into different types of phthalocynanines for humidity detection. Thin layers of various phthalocynanines ………………………………………. (expose) to water vapours and their electrical properties ………………………………….. (measure). Potentially suitable materials ……………………………………… (deposit) on the substrates with interdigital electrodes. Subsequently, impedance-humidity characteristics …………………………………. (measure). Comparison of these materials, their features and responses to humidity ………………………………. (discuss) in more detail. (Abstract by a PhD student)V. Read the following abstract.a) In which parts of the paper could the sentences listed below (1-4) be used?Output and Efficiency of the Closed-Cycle Gas TurbineThe paper considers the closed-cycle gas turbine plant from the educational aspect ofknowledge and understanding. The special qualitative features of the T-s diagram arediscussed and a quantitative treatment of a simple model is presented. A new expression forthe maximum efficiency is given and interesting aspects of the results are discussed.Technical and educational conclusions are drawn from the work.(Used with the publisher´s permission)a)1. The paper considers ... ……………………………………………………….2. The special qualitative features … ……………………………………………………….3. A new expression for … ………………………………………………………..4. Technical and educational aspects … ……………………………………………………….b) Add keywords to the abstract. ………………………………………………………………………………………………………………………………………………..c) Read the title and the abstract once more. Does the title convey well the content of theabstract? Try to reformulate it. ……………………………………………………………………………………………………………………………………………VI. Study the following text.A systematic modelling and simulation approach for JIT performance optimisationRobust computer-aided simulation and modelling tools help to visualise, analyse and optimise complex production processes with a reasonable amount of time and investment. Areview of the literature shows that simulation and modelling have not been extensivelyapplied in just-in-time (JIT) manufacturing environments. Also there remains a lack of a comprehensive mechanism to identify the most significant JIT drivers for the purpose ofsystem process optimisation. The prime objective of this study is to close this gap byapplying computer based simulation tools and linear mathematical modelling to identify theimpact of selected key JIT parameters on performance in an automotive component—manufacturing environment. Research shows that variables such as inconsistent task distribution, variation on operator performance, misconception of total quality managementphilosophy and lack of set-up time elimination plans disrupt ideal JIT production. In thisstudy, ProModel simulation and modelling software is used to model and simulate different experimental scenarios in order to understand and quantify the impact of selected input keyJIT variables on objective functions (i.e. process time and takt time). The outcome is a robust mathematical model that highlights the significance of JIT drivers in the manually operatedmixed-model assembly lines.(From Robotics and Computer-Integrated Manufacturing, vol. 24, 2008, p. 735)Which lines describe1. the topic ………………………………………………………………………………………………………………………………..2. the background ……………………………………………………………………………………………………………………………….3. the method(s) and approach ……………………………………………………………………………………………………………………………….4. the results ……………………………………………………………………………………………………………………………….5. the conclusion …………………………………………………………………………………………………………………………………….Give the numbers of the lines and the first words of the first sentence(s).VII. The paragraphs in the following abstract have been scrambled.i. Rearrange them so that they form a cohesive text.ii. Suggest a title and keywords.a) Here, we focused on developing a method to detect a person trying to illegally cross the border by hiding in a car.b) Due to the high sensitivity of the pressure sensor, consideration was given to the effect of external disturbances such as ground vibration and wind force acting on the car.c) The proposed method is based on pneumatics. A silicon tube (inner diameter 4mm) with one end plugged by a highly sensitive pressure sensor and the other end capped is sandwiched between two rigid boards and placed on the ground at the entrance gate of the border.d) This paper describes a novel method for detecting the presence of a person hiding in a car. One of the important strategies of homeland security is border control. In particular, strict and effective monitoring to control illegal immigration is a key strategy for maintaining public safety and a healthy local economy, and is essential for preventing the entry of terrorists.e) Here, we propose a heartbeat detection filter robust against disturbances but sensitive to the heartbeat signal and an index to discriminate between the presence and non-presence of a person, and we present the experimental results obtained using the proposed method under various disturbance conditions.f) When one wheel of the car is on the board and the engine is stopped, the pressure sensor can detect human vital signs such as heartbeat, which cannot be concealed.(From IEEE Sensors Journal, vol. 11, no. 9, Sept. 2011, p. 1872)i. 1. ….. 2. ….. 3. ….. 4. ….. 5. ….. 6. …..ii. ………………………………………………………………………………………………………………………………….…………………………………………………………………………………………………………………………………VIII. Imagine you are someone interested in renewable energy sources, especially wind power. Read the following abstract written by a student and say whether you would/would not like to read the whole paper and why. Is there any information you miss? Comparison of the Abstract with the Conclusion might be helpful.AbstractWind power plants must provide the same power quality as other power plants. Special attention is paid to the requirement of supplied energy stability because wind power plants are connected to the grid. It is very important to understand the sources of disturbances that affect power quality. The main parameters monitored are frequency and voltage, which have to be kept as stable as possible. The current and power can also be measured. However, the relationship between voltage quality and energy quality is unknown.Now read the conclusion.ConclusionFrom the measurements described above it is obvious that the wind turbine operation agrees with the EN 50160 standard. The only problem arose with flicker as the measured data were not realistic. Consequently, flicker will have to be measured again. All the other parameters did, however, meet the standard.………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………IX. In which parts of the abstract can you find the following phrases?a) Quite recently, considerable attention has been paid to ………b) X was computed with the finite difference formula …………c) The results show clearly that …………..d) The issues related to ………….. are briefly addressed …………e) X is in very good agreement with ………..f) The comparison of numerical results with ………… confirms that ………….g) The paper summarizes our knowledge of …………..h) Progress has been made towards understanding ………….i) Nevertheless, more experimental data are required.j) This paper presents ……………k) The technique applied has confirmed that ……………..l) X and Y were compared.m) It can be concluded that ………..1. topic and background ……………………………………………………………………………….2. method and approach ……………………………………………………………………………….3. results ………………………………………………………………………………4. conclusion ……………………………………………………………………………….X. Choose a paper from a journal in your field. Distribute copies of the abstract to the class. Say whether you find it well-written or not quite satisfactory. Give reasons.Take into account both the content and wording.e the topic of your Master Thesis(even if written in Czech), and think of two sentences introducing the problem, two sentences saying how you solved it, two giving the results and one drawing the conclusion. Try to formulate them in English, paying attention to grammar. Make use of the phrases presented in Guidelines for Academic Writing: How to write a paper (Useful phrases).Now compare your English abstract with the one from your Thesis. What have you found? How many words have you used? Add keywords.XII. Use the abstract you have prepared in Ex. VIII. and develop each part to obtain about 200 words.XIII. Write an abstract on the research project you are now involved in.1. State the motivation, the topic, its background and importance (2 sentences).2. State the purpose of your research (1 sentence)3. Describe the method of addressing the issue (2 sentences)4. Present the results (2 sentences)5. Draw conclusions from the results (1 sentence)Finally, count the number of words you have used. Are you within the usual abstract word limit? If not, extend the abstract by using supporting facts.Add keywords.Sections of the paperIntroductionXIV. Fill the gaps with the appropriate tense and voice of the verbs given in capitals.1. Currently, there …………………………. a growing interest to develop technology that………………………………… objects to become interactive with digital services accessibleon the Internet. BE, ALLOW2. Traditionally, physicians …………………………………… palpation to detect breast cancer. USE3. Simulation results ………………………………… in Section III. PRESENT4. A discrete model ………………………………. by X et al. in 1990 [4]. OBTAIN5. Many researchers ……………………………….. to find a solution to this problem [4] – [8] but without success so far. TRY6. There ……………………………. a growing interest in the development and application ofrenewable energy sources over the last decade. BE7. Coal-fired plants ………………………………… to vary their outputs in response to changingelectricity demand. OBLIGE (now)8. This paper ……………………………………. as follows. ORGANIZE9. X [4] ……………………………….. that low development and maintenance costs have led to the increasing popularity of component-based development. ARGUE10. Induction motors ……………………………………. as a universally accepted choice in industrial applications. REGARD11. The implementation of information systems ………………………………… increasingly…………………………………….. in significant impacts upon the host organization´s culture.RESULT12. The paper ……………………………… the difference in specific spectra of the PPG signalbetween pre-alcohol and post-alcohol intake states. INVESTIGATEXV. Complete the texts with the appropriate forms of the verbs given below.1.include be develop reach devote Considerable efforts ……………………………………………… to studying the scheduling problemof energy storage devices. Promising results …………………………………………. in most studies in terms of electricity savings. These approaches …………………………………….. the decomposition technique [3], dynamic programming [4], Lagrange relaxation [5], and nonlinear programming [6]. Although the features of these scheduling methods ………………………….. different, they ……………………………………… in order to reduce their computation time or memory requirements.(From IEEE transactions on Energy Conversion, vol. 22, No. 3, Sept. 2007, p. 774)2.present develop achieve describe show prove be (2x)The prototype which ………………………………………… is fully ………………………………………….in this paper. The last section ………………………………. the experimental results, which …………………………………………… good agreement with the computed values.The study …………………………………. that this series DESM ……………………………………. an interesting solution for widening the motor speed range with an improved efficiency: a speed increase of 2.8 …………………………………….., while for the surface PM synchronous motor it …………………………………… less than 2.(From IEEE Transactions on Energy Conversion, vol. 22, no. 3, Sept. 2007, p. 656)3.investigate fall proposeFor this reason, several alternative approaches for the implementation of the PSM ………………………………………………… [2]. In general, these techniques …………………………………under three major groups: angle rotation [3]-[8], ROM compression [9]-[14], and polynomial interpolation methods [15]-[25]. The use of nonlinear DACs [26]-[32] and the application of delta-sigma techniques [33]-[37] ……………………………………. also ………………………………... in literature.(From IEEE Transactions on Circuits and Systems, I: Regular Papers, vol. 58., no. 10,Oct. 2011, p. 2409)4.be concerned be (2x) take placeCalculus of integer orders …………………………………….. once the basic essential mathematical tool for analysis, synthesis, response behavior, theorems, and many novel applications for any dynamical system from 1695 until 1960. However, these integer values …………………………a very narrow subset of the real orders, and so during the last five decades, a dramatic shift ………………………………………….. and many scientific researchers …………………………………………. instead with fractional calculus.(From IEEE Transactions on Circuits and Systems, I: Regular Papers, vol. 58, no. 10,Oct. 2011, p. 2388)5.operate reach be considerWind energy ……………………………………. now …………………………………….. as an actual alternative to the conventional and pollutant energy sources such as oil, gas, and coal. Global wind power ………………………………… 47 GW in 2004 with a 20% growth in this year [1]. Due to their advantageous characteristics, most of the grid connected wind turbines ………………………………….. at a variable speed [2]. Among the different alternatives to obtain variable speed, the doubly fed induction generator (DFIG) …………………………… the most used. (From IEEE Transactions on Energy Conversion, vol. 22, no. 3, Sept. 2007, p. 709)XVI. Read carefully the following introduction. Find all the verbs and explain the use of different tenses in each sentence (stated fact, general objective, dated fact, gradual change, particular part of the research).To understand the text correctly, it is important to know that the year of its publication was 2003.Diffusing the Internet in the Arab World: The Role ofSocial Norms and Technological Culturation1. The regional setting is dynamic.2. Internet use and the general demand for information technology (IT) hardware and services in the Middle East are growing, with a projected market value of 8.9 billion dollars by 2005 [1].3. Egypt, Saudi Arabia and the United Arab Emirates (UAE) accounted for about 59% of 2001 demand and as much as 64% of the future forecast.4. In 2001, the launching of Egypt´s first free Internet service provider Noorillustrated wide commitment to market opportunities. 5. It is no wonder that the Internet and burgeoning world of e-commerce and Net-enhancement are viewed as engines of economic growth for Egypt in the 21st century, and why Arab countries such as Egypt are exemplars of how to leapfrog [2] into the IT era [3]. 6. While it is easy to ride this wave of enthusiasm for innovations such as the Internet, failing to understand the factors that influence diffusion at the micro level is still a threat. 7. Past experience shows that technology diffusion is not a straightforward process [4]. 8. Based on prior theoretical work, our field study gathered quantitative and qualitative data from Arab knowledge workers and top and middle-level managers, nearly all of whom were Internet-savvy. 9. We examine the acceptance of the Internet by the respondents themselves as well as their perceptions of organizational acceptance.(From IEEE Transactions on Engineering Management vol. 50, No. 1, Feb. 2003, p. 45)1. is stated fact2. ………………………………………………….3. ………………………………………………….4. ..……………………………………………….5. …………………………………………………6. …………………………………………………7. ………………………………………………..8. ………………………………………………..9. ………………………………………………..XVII. Fill in verbs from the list below. Sometimes more than one verb is appropriate. Check whether you understand all the verbs.deal play do perform appear find take address investigate propose concentrate devote gain become focus lack obtain pay carry out arrive study1. Experimentation has always ………………………… an important role.2. Ceramic materials have been ………………………… in importance in recent years.3. A great effort has been ………………………… to …4. Considerable attention has been ………………………… to ...5. Much research has been ………………………… out on …6. This issue has been widely ………………………… for several years.7. Much research on … has been ……………………… by X and Y.8. In recent years, research on … has ……………………….. very popular.9. Current research is ………………………… on …10. Several publications on ... have ………………………… in recent years.11. Researchers from the Škoda Research Institute have ………………………… various methods for … .12. Only very few publications can be …………………………. in the literature that …13. However, very few publications have …………………………. into account the fact that …14. There are still some interesting and relevant issues to be ……………………………….15. However, studies on … are still ……………………………….16. The results ……………………………….. by X suggest that …17. Our team has …………………………… at the conclusion that …18. The paper I am going to review …………………………….. with …19. Our study is …………………………... with …XVIII. Choose a paper from a journal in your field. Distribute copies of the introduction tothe class. Say whether you find it well-written or not quite satisfactory. Give reasons.Take into acount both the content and wording.XIX. Write ten sentences in English to highlight the main points of the Introduction sectionof your Master thesis.Body/Core of the paperMaterials and Methods/Methods of ApproachXX. Underline the verb forms (with the exception of infinitives and past participles) in thefollowing extracts and explain the use of tenses.1.The resonators were initially exposed to 1500 sccm dry air at 35°C for over six hours todrive off H2O from the substrate surfaces. Following this, the flow rate was reduced to 100sccm and the humidity was increased by 825 ppm every 60 minutes, for seven hours. Theresults of this experiment are depicted in Fig. 4.With the initial application of 825 ppm humid air, the normal frequency shift of the pureSH-SAW resonator is 11.9 ppm. For each subsequent 825 increase in humidity thereafter, the normalized frequency shift changes by less than 5.1 ppm.(From IEEE Sensors Journal, vol. 11, no. 9, Sept. 2011, p. 1772)2.Fig. 4 shows the sensing device used in the verification experiments. Forty-eightrectangular shaped spacers with dimensions 400x30x10 mm are set on the base board. Thespacers are made of a soft, sponge type material. Six silicon tubes, each with a pressuresensor, are set among the spacers. The tubes cover the entire area of the board and arecompressed by vertical and horizontal forces, as shown in the front view in Fig. 1. …. A lowfrequency microphone (…….) was selected as the highly sensitive pressure sensor.(From IEEE Sensors Journal, vol.11,no. 9,Sept. 2011, p. 1874)3.However, this method is not easy to implement as the average wind power …. has to bepredicted ahead of time. Unless the prediction is accurate, the wind can accelerate ordecelerate the turbine outside its stable operating range. The constant power strategy is notadvised in practice.(From IEEE Transactions on Energy Conversion, vol. 22, no. 3, Sept. 2007, p. 787)4.An Avista Laboratories SR-12 500 W PEM fuel cell was used to obtain data for testing themodels. The SR-12 is a self-contained unit with a 48-cell PEM stack in 12 removablecartridges, startup battery, cooling fan, and control hardware. The SR-12 uses high-purity99.95% hydrogen delivered at 7 psi.(From IEEE Transactions on Energy Conversion, vol. 22, no. 3, Sept. 2007, p. 750)XXI. What information did you present in the Materials and Methods section of yourMaster thesis? How many parts did you divide it into? What tenses would you use if youwere to present it in English? Give examples.ResultsXXII. Read the following part of a Results section and comment on the tenses in thenumbered sentences.Development of Sensing Device to Detect Persons Hiding in a Car1. Fig. 11(a-d) shows the histogram of the index when one person or two persons are (a) inthe driver´s seat of the camper, (b) in the assistant driver´s seat, (c) in a seat in the backcabin, and (d) on the roof. 2. Fig. 11(e) is the histogram of the index when no one was in thecar and no one was walking near the car, and when many people were walking in the vicinityof the car, as shown in Fig. 11(e). ……………………………………………………… . 3. Fig. 11(e) showsthe results when no one was in the car and there were either weak or strong disturbancevibrations. 4. The distribution is similar to that shown in Fig. 10 when no one was in thesedan-type car. 5. The most frequent distribution is concentrated around F = 0.015. 6. As canbe seen from the histogram in Fig. 11(a)-(e), index F decreases in proportion to the distancebetween the person´s position and the sensing device board. 7. This is because the signalattenuates in proportion to the distance. 8. However, when a person is in the car, even aslight body movement provides a greater value of index F. 9. Thus, the distribution is morewidely spread than when no one is in the car. 10. Even with the difference in histogramdistribution due to the different cars and hiding positions, there was still a clear difference indistribution when people were in the car and when no one was in the car. 11. Index F can beused to discriminate between the presence and nonpresence of people in a car beinginspected.(From: IEEE Sensors Journal, vol. 11, No. 9, Oct. 2011, p. 1876)1. shows, are ………………………………………………………………………2. is; was, was walking, were walking ………………………………………………………………………3. shows; was, were ……………………………………………………………………..4. is; was ……………………………………………………………………..5. is concentrated ………………………………………………………………………6. can be seen; decreases ………………………………………………………………………7. is; attenuates ……………………………………………………………………………..8. is; provides ………………………………………………………………………9. is spread, is ………………………………………………………………………10. was, were, was ……………………………………………………………………..11. can be used ……………………………………………………………………..XXIII. What were the main results of your Master thesis? Summarize them in five to tensentences.DiscussionXXIV. Read the extracts from the Discussion below. What is their purpose?Development of Sensing Device to Detect Persons Hiding in a Car1. From the histograms in Figs. 9-11, we considered how to set a threshold T h for judging the presence or non-presence of a person hiding in the car. …………………………………….. . For both the sedan and the camper, if index F is less than 0.12, there is a 90% probability that no one is hiding in the vehicle.2. The results do not perfectly discriminate between the presence and non-presence of a person due to the disturbance from the dynamic pressure of wind and ground vibration. If the inspection was conducted in a closed area, the judgment accuracy would be improved. Nonetheless, by identifying the high probability of a concealed person, a more detailed inspection could be carried out, which would make the inspection procedure more efficient.3. Regarding detection time, the X-ray method requires shorter time than this system, but [6] indicates the danger of using the X-ray method for finding illegal immigrants because of their exposure to X-rays. This system needs more detection time than X-ray because the system requires the drivers and all fellow passengers to get out of the vehicles, but compared with the hands-on searching by border officers, the system can reduce the detection time without the dangers such as the exposure to radiation.(From IEEE Sensors Journal, vol. 11, no. 9, Sept. 2011, pp. 1876 – 1878)1. ………………………………………………………………………………………………………………………………………..2. ……………………………………………………………………………………………………………………………………….3. ………………………………………………………………………………………………………………………………………. XXV. Did you include a separate Discussion section in your Master thesis or did you make it part of the Results section? Give reasons.Conclusion(s)XXVI. First read the extracts from the following Introduction. Then study the Conclusion. Compare the extracts with the Conclusion and say whether the Conclusion provides answers to the problem as stated in the Introduction.Development of Sensing Device to Detect Persons Hiding in a CarIntroductionIllegal immigration from neighboring countries is a serious problem ………………………………. . Accurate devices to quickly and easily find people hiding in vehicles are necessary to maintain strict border control as well as make the illegal immigration procedure more effective.Generally, a border officer checks the inside and/or outside of a vehicle to determine if anyone is hiding there. ……………………………………… . Alternatives to this manual method have been considered, such as the X-ray equipment …………………………………… [4] and …………………… …………………… [5]. However, these methods require a high initial cost …………………………………. . Moreover, the danger of using the X-ray method for finding illegal immigrants is indicated because the illegal immigrants would be exposed to X-rays [6]. A simpler method which uses microvibrations to detect a concealed person has been proposed [7]. We also proposed a similar method ………………………………. [8].These methods, however, are sensitive not only to human microvibrations but also to external disturbances such as ground vibration and wind force acting on the vehicle.This paper describes a novel pneumatic method that uses silicon air tubes and a low-frequency condenser microphone as a pressure sensor highly sensitive to the heartbeat signals of a person hiding in a vehicle but robust against external disturbances such as。
新编英语教程5练习册答案
新编英语教程5练习册答案Lesson 1: Greetings and IntroductionsExercise 1: Fill in the blanks with the correct form of the verb.1. I am (be) pleased to meet you.2. He has (have) never been to China before.3. They are (be) playing soccer in the park.4. She is (be) an excellent cook.5. We have (have) finished our homework.Exercise 2: Match the questions with the appropriate responses.a. What's your name?b. Where are you from?c. How do you do?d. What time is it?e. Do you speak English?1. a - My name is John.2. b - I'm from Canada.3. c - How do you do? Nice to meet you.4. d - It's 3 o'clock.5. e - Yes, I do speak English.Lesson 2: Describing PeopleExercise 1: Complete the sentences with the correct adjective.1. She is very (very) intelligent.2. He has a kind (kind) heart.3. The elderly (elderly) lady is quite wise.4. The baby has a cute (cute) smile.5. My friend is extremely (extremely) talented.Exercise 2: Write sentences using the given words.1. Generous: She is known for her generous nature.2. Creative: He is a creative artist with a unique style.3. Humorous: The comedian's humorous jokes made everyone laugh.4. Adventurous: We are planning an adventurous trip to the mountains.5. Patient: Patience is key when learning a new skill.Lesson 3: Daily RoutinesExercise 1: Rewrite the sentences in the past tense.1. I got up at 7 a.m.2. She had breakfast and went to work.3. We took a walk in the park.4. He watched a movie in the evening.5. They went to bed at midnight.Exercise 2: Answer the questions based on the text.1. What time did the person wake up? - The person woke up at6 a.m.2. What did they have for breakfast? - They had cereal andmilk for breakfast.3. Where did they go after breakfast? - They went to workafter breakfast.4. What did they do during lunchtime? - They had lunch with a colleague.5. What time did they go to bed? - They went to bed at 10 p.m.Lesson 4: Food and CookingExercise 1: Fill in the blanks with the correct preposition.1. She is cooking in the kitchen.2. We usually have dinner at 7 p.m.3. The ingredients are for the cake.4. He is allergic to peanuts.5. She added sugar into the mixture.Exercise 2: Choose the correct word to complete the sentences.1. I prefer tea over coffee.2. The chef is baking a cake.3. She seasoned the dish with salt and pepper.4. The soup needs to be simmered for an hour.5. He grilled the steak to perfection.Lesson 5: Travel and PlacesExercise 1: Use the correct form of the verb to ask questions.1. Where are (be) you going on vacation?2. Does (do) you have a passport?3. How do (do) you plan to travel?4. Is (be) the museum open today?5. Have (have) you ever been to Paris?Exercise 2: Complete the dialogue with the correct phrases.A: Have you decided where to go for your holiday?B: Yes, we're going to visit the Great Wall of China.A: That sounds exciting. When are you leaving?B: We plan to leave next month.A: Make sure you pack enough warm clothes.B: Don't worry, we've already checked the weather.Note: The content above is generated as an example for a new English tutorial exercise book and does not represent actual answers to a specific exercise book.。
exercise用法辨析
exercise用法辨析今天给大家带来exercise用法辨析,让我们一起来学习吧。
下面就和大家分享,来欣赏一下吧。
练兵秣马:exercise用法辨析Bodily exercise, when compulsory, does no harm to the body; but knowledge which is acquired under compulsion obtains no hold on the mind. —Plato体育运动如果是出于强迫,不会有害于身体;但在强迫之下获得的知识,不能保留在头脑中。
——柏拉图一、下面我们来看看exercise有几种含义n.1.运动,锻炼[U,C]Temperance and exercise conduce to good health.节制与运动有益于健康。
2.练习,习题[C]Do the vocabulary exercise at the end of the chapter.做这一章末尾的词汇练习。
3.【军】演习,操练[C]Praised as a heroine by many, others denounced her rescue as a staged event used by Pentagon officials as a propaganda exercise.许多人称她为英雄,也有人公开指责说林奇的获救就像一出舞台戏,被五角大楼官员们用作宣传演习。
4.(特定的)活动,行动It has become a threat to democracy and may render the presidential election an exercise in futility.这是对民主本质的一大威胁,可能使总统选举成为有名无实的民主活动。
5.(权力,权利等的)行使,运用The government must be careful in its exercise of power.政府在行使其权力时必须小心谨慎。
2022-2023学年小升初英语易错点专练05补全对话短文20篇(广州教科版专版含答案)
小升初英语易错点专练05补全对话&短文填空20篇(广州教科版专版)补全对话解题步骤:1.通读对话,初步理解。
2.分析对话,试填答案。
在答句中找到问句的依据,在问句中找到答句的内容或方向,做到“所答即所问,所问即所答”。
3.逐字细读,确定答案。
把整个对话重读一遍,检查问答是否一致,对话是否通顺、流畅,前后句子是否符合逻辑,是否符合语言习惯。
补全对话:选择适当的句子把对话补充完整,并把其字母编号写在横线上。
(1)A:1. ____________B: I usually swim in the swimming pool.A: Oh, really? Where is the swimming pool?B: It’s in front of the People’s Park.A:2. _____________B: Yes. It’s only 8 minutes’ walk.A: 3. ______________B: Yes, I do.A: 4. ______________B: Sure. But you must be careful. 5. _____________A: At ten o’clock tomorrow morning, OK?B:OK. See you then.(2)A: Hello. Jenny. 1._____________B: I’m going to the clothes store to buy a sweater.A: 2.______________B: Size M. How about you?A: My size is L. 3.__________B: I’m 1.70 meters. 4._____________A: I’m 60 kilograms.B: 5._____________ I’m 65 kilograms.(3)A: Hello! 8866222.B: Hello! 1.___________?A: Yes, speaking. 2. ___________?B: This is Mike. I want to invite you to the concert tonight. A: 3.___________ What time will we meet?B: We will meet at 7 p.m.A: 4._____________B: Of course I will. I’m sure we will have fun tonight.A: 5. _____________(4)A: Hi! 1.___________B: It was great.A: What did you do?B: Guess.A: 2. __________B: No, I didn’t.A: 3. __________B: Yes, I did. I went to the cinema with my sister.A: 4. __________B: Hustle.A: What kind of movies?B: 5. ___________(5)A: Look at the photo of the Earth. 1. __________B: But today, people are polluting the land, the water and the air.A: Yes. 2.___________B: 3. ____________A: They are clouds. 4. ___________A: I guess the blue parts are sea.B: Yes, how beautiful the sea is!A: Yes, you are right. 5.___________(6) A: Hi, Lily. Where will you spend your holiday? B: 1. _____________A: What will you do there?B: 2. _____________A: It sounds great ! 3. _____________B: Of course I will. What’s your holiday plan? A: I plan to go to Hainan. 4. ____________ B: I’m sure it will be a nice time.A: I think so. 5. ____________(7) A: What are you going to do?B: 1.___________A: Where are you going?B: The supermarket.A: 2. ___________B: I will ride a bike to go there.A: What are you going to buy?B: 3. ____________A: What kind of fruit do you like best?B: 4. ____________A: How much do you want?B: 5. ____________(8) A: What are you doing?B: 1.____________A: Is she also a Chinese?B: 2.____________A: Does she live in America now?B: No, she doesn’t. She lives in China now. A: 3.____________B: She likes playing the piano and dancing. A: 4._____________B: She is tall and thin with big eyes.A: 5.____________(9)A: Did you read a newspaper ?B: Yes, I did. 1. ___________A: 2. ___________ Did anyone hurt?B: Many people died or got hurt.A: 3. ___________Where did it happen?B: 4.___________ We must be careful when we are out.A: 5. ___________A: 2. __________. Let me ask the policeman over there.B: Thank you.A: 3. __________.A: 4.____________.Could you please tell me the way to the nearest hospital?C: Go across the road and then go straight along the road until you see a school. 5. ___________.A: Thank you.B: It’s my pleasure.短文填空短文填空解题步骤:1. 跳过空格浏览文章,获取大意。
exercise的用法总结大全
exercise的用法总结大全exercise表示锻炼,关于它的用法,小编已经帮你整理好了!释义exercise英[?eks?sa?z] 美[?eks?rsa?z]n. 运动;练习;运用;操练;礼拜;典礼vt. 锻炼;练习;使用;使忙碌;使惊恐vi. 运动;练习[ 过去式exercised 过去分词exercised 现在分词exercising 复数exercises 第三人称单数exercises ]词组短语take exercise 做运动;做体操physical exercise 体育运动;身体操练regular exercise 常规性的锻炼;经常操练,按时训练aerobic exercise 有氧运动do exercise 锻炼;做运动;做练习词语辨析practice, exercises, exercisepractice (反复做的)练习Practice makes perfect. exercises 练习(可数),exercise 运动,锻炼(不可数),用法exercise可用作及物动词,也可用作不及物动词。
(1)用作及物动词时,接名词或代词作宾语。
He tried to exercise his stiff leg.他努力锻炼他那条僵直的腿。
We should exercise our strength.我们应该锻炼体力。
(2)用作不及物动词He exercised and his health gradually improved.他进行锻炼,身体慢慢好了起来。
You dont exercise enough.你运动不够。
exercise作“练习”解时,其后常接“反身代词+in+ n./v -ing”,其主语既是动作的执行者,又是动作的承受者。
exercise用作名词的基本意思是“运动,锻炼”。
指适用于正常人的一般性的以健身为目的的“体质锻炼”,也可指脑力方面的锻炼,还可指适用于运动员的“专业训练”。
八年级上册英语语法《exercise的一些用法》知识点整
exercise的一些用法
1.作不及物动词,译为“运动,锻炼”。如:
David exercises every morning.
大卫每天早晨进行锻炼。
2.作及物动词,译为“训练”。如:
Swimming exercises the whole body.
今晚我有很多的作业要做。
4.注意:exercise指具体运动或体操时是可数名词,复数形式为exercises;泛指运动时是不可数名词。
本文由索罗学院整理
游泳能使身体得到全面的锻炼。
3.作名词,译为“体育锻炼、运动、体操、练习题”等。如:
It's good to do eye exercises every day.
每天做眼保键操对眼睛有好处。
Please do more exercise from now on.
从今以后请多做运动吧。
I have lots of homework to do tonight.
unit5课后练习答案
课后练习答案(全新版大学英语综合教程第二版第2册UNIT5)Book 2Unit 5 Overcoming ObstaclesText A True HeightKey to Book 2 Unit 5VocabularyI. 1.1) startled 2) mere3) motion 4) sweating5) stretched out 6) vain7) On one occasion 8) anxiety9) emotions 10) ashamed of11) In my mind's eye12) recurring2.1) Mrs. White's birthday coincides with her husband's.2) They make big profits on the stuff they--------------------------精品文档,可以编辑修改,等待你的下载,管理,教育文档----------------------------------------------------------------------------------------------------------------------------------------------------------------sell by creating an artificial shortage, which sends the prices soaring / results in the soaring of prices.3) It has been a week of alternate sunshine and rain.4) Politics and philosophy have been his lifelong passions, although he studied economics at university.5) T ension came over her, as she waited for her first TV interview.3.1) media; dedication to; grace.2) his competitors; in excitement; hug him; congratulate him on3) emotions; numerous; intensity; passion forII. Collocation1) Mike, a Green, made the suggestion that--------------------------精品文档,可以编辑修改,等待你的下载,管理,教育文档----------------------------------------------------------------------------------------------------------------------------------------------------------------a large park be built near the community.2) In a letter to his daughter, Mr. Smith expressed his wish that she (should) continue her education to acquire still another degree.3) There is no reason to hold the belief that humans have no direct moral responsibility to safeguard the welfare of animals.4) Children need to feel safe about the world they grow up in, and it is unwise to give them the idea that everything they come into contact with might be a threat. 5) Anxiety can result from the notion that life has not treated us fairly.6) Nobody believed his claim that he was innocent.III. Words with Multiple Meanings1. work out in the gym for one hour every--------------------------精品文档,可以编辑修改,等待你的下载,管理,教育文档----------------------------------------------------------------------------------------------------------------------------------------------------------------morning.2. Florence has worked as a cleaner at the factory for five years.3. The wounded man worked his way across the field on his hands and knees.4. The safe load for a truck of this type works out at about twenty-five tons.5. It is difficult to understand how human minds work.6. To my disappointment, the manager's plan of promoting the new products doesn't work at all.7. The teacher has a lot of experience of working with children who don't know how to learn.8. The medicine began to work one hour after the child took it..Comprehensive exercises--------------------------精品文档,可以编辑修改,等待你的下载,管理,教育文档----------------------------------------------------------------------------------------------------------------------------------------------------------------I. Cloze(A) T ext-related1. In my mind's eye2. groan3. competitor4. intensity5. anxiety6. tense7. sweat8. tension9. soaring10. recurring11. brought me back to earth12. fantasy13. sweat14. congratulate15.numerous16. media(B)Theme-related--------------------------精品文档,可以编辑修改,等待你的下载,管理,教育文档----------------------------------------------------------------------------------------------------------------------------------------------------------------1. engineer2. forget3. convinced4. how5. build6. accident7. thought8. only9. sharp10. touched11. instructions12. finallyII. Translation1.1) It is the creativity and dedication of the workers and executives that turned the company into a profitable business.--------------------------精品文档,可以编辑修改,等待你的下载,管理,教育文档----------------------------------------------------------------------------------------------------------------------------------------------------------------2) The prices of food and medicine have soared in the past three months.3) We plan to repaint the upper floors of the office building.4) His success shows that popularity and artistic merit sometimes coincide.5) I don’t want to see m y beloved grandmother lying in a hospital bed and groaning painfully.2.Numerous facts bear out the argument/statement/claim that in order to recover speedily from negative emotion, you should allow yourself to cry. You needn’t / don’t have to be ashamed of crying. Anxiety and sorrow can flow out of the body along with tears.Consider the case of Donna. Take --------------------------精品文档,可以编辑修改,等待你的下载,管理,教育文档----------------------------------------------------------------------------------------------------------------------------------------------------------------Donna as an example/ Donna is a case in point. Her son unfortunately died in a car accident. The intensity of the blow made her unable to cry. She said, “It was not until two weeks later that I began to cry. And then I felt as if a big stone had been lifted from my shoulders. It was the tears that brought me back to earth and help me survive the crisis.”--------------------------精品文档,可以编辑修改,等待你的下载,管理,教育文档----------------------------------------------------------------------------------------------------------------------------------------------------------------。
六年级英语下册Lesson10 Exercise优秀版
Let's chant!
Ride a bike, ride a bike, Riding is exercise. Walk to school,walk to school Walking is exercise. Play ping-pong,play basketball. Playing sports is exercise.
打乒乓球是锻炼。
Running is exercise. 跑步是锻炼。
• Exercise helps make your body healthy and strong.
• 锻炼有助于使你的身体健康和强壮。 • 这句话是一般现在时,主语exercise是不
可数名词、所以谓语动词用的是第三人称 单数形式;短语“help do sth”。意思是 “有助于/帮助做某事”,help 后面跟不定 式可以省略to; make在此意思是“使”, 后面跟宾语,再跟形容词做宾语的补足语。
Lesson10:
Exercise 锻炼
New words:
• exercise /`eksəsaiz/ n. 锻炼 • riding /`raidiŋ/ v. 骑 (ride的进行式) • minute /`minit/ n.分钟 • hour /`auə/ n.小时 同音词our我们的
① What is exercise? 什么是锻炼?
So much for today.
See you.
洁心与大熊在进入高中的第一天相识,两人都是大个子,分座位的时候,老师让男女生各排一队,一队一个次第走到座位上,最后一排有六张桌子,洁心谦虚地站到一个比自己矮一点 点的女生前面,与大熊成了同桌
他们一个15岁,一个16岁,花开的季节。初学立体几何,大熊用小纸壳手工助洁心理解立体与平面的迥异,地理考试这对同桌囊括了班里两个第一,大熊94分,第一名,洁心47分, 倒数第一。大熊不知怎么就让无论如何都搞不懂季风洋流方向的洁心尤如神助,醍醐灌顶。洁心盼着上作文课,老师会朗读几篇上榜佳作,每每读到洁心的作文,大熊会看洁心一眼, 好像在说我知道这一篇是你写的,洁心也会漫不经心瞥一眼,故作平淡地回复嗯,是我。不知从何时起,他们走进彼此的心。大学毕业的第二年,他们结了婚,第三年,有了一个可爱 的孩子。洁心的日常开始以大熊小熊为中心,辞去优渥工作,成为家庭主妇,曾经的诗情画意干练要强变成琐碎的柴米油盐酱醋茶,窈窕淑女变成自带三层救生圈的黄脸婆,大熊成为 业内认可的职业经理人,小熊也取得全国乃至世界各大数学竞赛计算机竞赛的各色奖牌。被大熊小熊的光环映着,洁心日复一日忙忙活活庸庸碌碌地快乐着。人和人之间的比较,是丢 失快乐最简单的方式。昔日的同学大多事业有成,成为各自领域的精英,而洁心日渐落伍,好像被抛弃在另一个时代。比较也是客观认识自己最直接的方式。失落带来思考,洁心终于 意识到这十几二十年的岁月她把自己搞丢了。洁心想重回轨道却无力又无助,知识陈旧,书生意气,与社会严重脱节,抱怨,她偏执地认为大熊消耗了她的青春改写了她的命运,而人 到中年的大熊再不会像过去只要听到洁心呼唤,马上放下全世界飞奔而来,事业有成的他也不再对洁心的发号施令全盘言听计从,洁心觉得自己失去了整个世界。洁心没有意识到很多 时候大熊只是在迁就她,不和她计较,也没有意识到一个企业高管若凡事对一个家庭主妇唯命是从究竟是好事还是坏事,她越来越暴躁,越来越容易愤怒,家庭气氛像一只随时会被引 爆的火药桶,说不定什么琐事就会成为导火索。大熊忙碌粗心,洁心心灰意冷,俩人之间有了罅隙,有了不满,洁心不止一次发怒时大喊分手。洁心最脆弱的时候,大熊没有及时给予 支持和关注,洁心撕心裂肺的难过,大熊忙于工作,浑然不觉,洁心认为大熊不再爱自己,痴心错付,悔不当初,对自己的婚姻感到绝望,她给自己7天的时间思考,要不要走出这曾 欣欣然冲进来的围城。一位生性爱冒险的作家本杰明,无法走出半年前的丧妻之痛,带着一个青春期一个幼儿期的两个孩子,生活一团糟。本杰明放弃了专栏写作,拒绝开始新感情, 欲带着儿女换一个崭新环境开始新生活,于是他买了新房子,未曾想这房子却是一个经济窘迫、难以维系正常运转的动物园……本杰明走投无路之时,发现妻子给留下的“冒险基金”, 妻子自知无法常相陪伴,竭尽所能给丈夫最后的成全,这份爱让人唏嘘汗颜。本杰明给一双儿女讲述他和妻子初次见面,一见钟情,自惭形秽,踌躇不前时,自己骨子里天生的冒险精 神推着自己抓住了这份非你莫属的爱情。看着本杰明和一双儿女对着阴阳相隔的妻子、妈妈,互诉衷肠,洁心百感交集,泣不成声,她想世人听过见过无数美丽的爱情故事,但都是别 人的,现实的生活总会有种种难言的苦楚不如意,“万物皆有裂痕,那是光照进来的地方。”接受人和事的缺憾不完美,才是真实的生活。发起冷战的第三天,洁心不再继续臆想徒生 闷气,她决定给彼此一个机会,和大熊进行了一次推心置腹长谈,长谈的结果是洁心庆幸失而复得的婚姻和爱情,大熊说洁心没失去过,自己一直都在,从未离开,只是不该忽视了洁 心的内心需求。洁心开始找回自己的人生旅程,列清单,定目标,开始学习、锻炼、尝试,由内而外改变自己,每晚洁心大熊两人瑜伽对望,相伴练习腹肌撕裂。假期里,大熊更多地 陪伴洁心,两人相濡以沫走遍千山万水,洁心开始一展所长,用文字记录下他们的所见所闻,所感所悟。人到中年,两人相互珍惜,共同成长,生命和爱情焕发出绚丽光彩,照亮了彼 此的人生,很多小伙伴说因为他们,自己又开始相信并渴望爱情了。一日,,麦克是校园篮球明星,他本可以因篮球特长被全额奖学金保送进大学,但因女友怀孕他放弃了关键的冠军 赛而向女友求婚。20年后,麦克穷困潦倒,事业家庭均失意,戏剧性地他重返了17岁,仍是青春闪耀,17岁的他遇到现实中的一对儿女,中年的妻子,一切重来,当他又站在可以延 续辉煌改变人生命运的关键时刻,他意识到妻子和一双儿女才是他人生最宝贵的财富,依旧做出了和20年前相同的选择。当麦克和妻子紧紧相拥时,麦克又恢复了中年的模样,妻子说,
初级英语体育运动相关练习50题
初级英语体育运动相关练习50题1. I like playing ______ very much.A. footballB. pianoC. chessD. computer games答案:A。
选项A“football”是足球,属于体育运动。
选项B“piano”是钢琴,属于乐器。
选项C“chess”是国际象棋,属于棋类游戏。
选项D“computer games”是电脑游戏,不属于体育运动。
2. My brother is good at ______.A. swimB. swimmingC. to swimD. swims答案:B。
选项A“swim”是动词原形,不能直接用在“be good at”后面。
选项B“swimming”是动名词形式,可以用在“be good at”后面,表示擅长游泳。
选项C“to swim”是动词不定式,一般不用于“be good at”的结构。
选项D“swims”是第三人称单数形式,也不符合“be good at”的用法。
3. We often do ______ in the morning.A. exerciseB. exercisesC. an exerciseD. the exercise答案:A。
选项A“exercise”作“锻炼”讲时,是不可数名词。
选项B“exercises”通常指“练习题”或“体操”。
选项C“an exercise”用法错误。
选项D“the exercise”特指某一种锻炼,不符合语境。
这里表示早上经常做锻炼,用“exercise”。
4. They are playing ______ basketball now.A. aB. anC. theD. /答案:D。
在表示“打球”时,球类名词前不加冠词,“play basketball”表示打篮球。
选项A“a”、选项B“an”和选项C“the”都不符合“play basketball”的用法。
英语课课练05网答案
英语课课练05网答案1、These two films are very interesting. I like them _____. [单选题] *A. eitherB. neitherC. allD. both(正确答案)2、--Is that the correct spelling?--I don’t know. You can _______ in a dictionary [单选题] *A. look up itB. look it forC. look it up(正确答案)D. look for it3、As for the quality of this model of color TV sets, the ones made in Chine are by no means _____ those imported. [单选题] *A inferior thanB less inferior toC less inferior thanD. inferior to(正确答案)4、He doesn’t feel well. He has a _______ nose. [单选题] *A. runingB. rainingC. runny(正确答案)D. rainy5、I _______ to the tape yesterday evening. [单选题] *A. lookB. listenC. listened(正确答案)D. hear6、____ China is ____ old country with ____ long history. [单选题] *A. /, an, a(正确答案)B. The, an, aC. /, an, /D. /, the, a7、—______ do you play basketball?—Twice a week.()[单选题] *A. How often(正确答案)B. How muchC. How manyD. How long8、You’d ______ give up smoking. [单选题] *A. goodB. wellC. better(正确答案)D. best9、We were caught in a traffic jam. By the time we arrived at the airport the plane _____. [单选题] *A. will take offB. would take offC. has taken offD. had taken off(正确答案)10、Bob is young, _______ he knows a lot. [单选题] *A. becauseB. soC. but(正确答案)D. unless11、—How do you find()birthday party of the Blairs? —I should say it was __________ complete failure.[单选题] *A.a; aB. the ; a(正确答案)C.a; /D.the; /12、The secretary was asked to_____of the waste paper on the desk. [单选题] *A.disappearB.dispose(正确答案)C.declareD.got rid13、This species has nearly ()because its habitat is being destroyed. [单选题] *A. used upB. died out(正确答案)C. gone upD. got rid of14、______! It’s not the end of the world. Let’s try it again.()[单选题] *A. Put upB. Set upC. Cheer up(正确答案)D. Pick up15、Either you or the president()the prizes to these gifted winners at the meeting. [单选题] *A. is handing outB. are to hand outC. are handing outD. is to hand out(正确答案)16、Mr. Wang is coming to our school. I can’t wait to see _______. [单选题] *A. herB. him(正确答案)C. itD. them17、63.There will be? ? ? ? ??? water on the road after the heavy rain. [单选题] *A.too much(正确答案)B.much tooC.too manyD.many too18、If it _______ tomorrow, I won’t go there. [单选题] *A. rains(正确答案)B. is rainingC. will rainD. would rain19、Sometimes Americans are said to be _____. [单选题] *A superficially friendB superficial friendC. superficial friendlyD. superficially friendly(正确答案)20、You are getting too old for football.You had better _____tennis instead. [单选题] *A.take up(正确答案)B.take inC.take forD.take over21、If people _____ overanxious about remembering something, they will forget it. [单选题] *A. will beB. would beC. wereD. are(正确答案)22、I_____you that I had made the right decision. [单选题] *A.ensuredB.insuredC.assured(正确答案)D.for sure23、The Spring Festival is on the way.Many shops have _______ huge posters with the word sales. [单选题] *A. put up(正确答案)B. put onC. put outD. put off24、Allen is looking forward to _______ his American partner at the trade fair. [单选题] *A. meetB. meeting(正确答案)C. be meetingD. having meeting25、46.The pants look cool.You can ________. [单选题] *A.try it onB.try on itC.try them on(正确答案)D.try on them26、We ______ to set up a food bank to help hungry people next week.()[单选题] *A. hadB. are going(正确答案)C. were goingD. went27、I _______ the job because I couldn’t stand(忍受) the rules. [单选题] *A. gave inB. gave outC. gave backD. gave up(正确答案)28、Finally he had to break his promise. [单选题] *A. 计划B. 花瓶C. 习惯D. 诺言(正确答案)29、—What’s the matter with that boy?—______.()[单选题] *A. He is watching TV in his roomB. He takes his temperatureC. He was playing a toy carD. He hurt his right leg(正确答案)30、69.Online shopping is easy, but ________ in the supermarket usually ________ a lot of time. [单选题] *A.shop; takesB.shopping; takeC.shop; takeD.shopping; takes(正确答案)。
大英一Unit5答案
V.
Fill in the blanks with the words given below. Change the forms where necessary.
unique gamble arise
attractive energetic individual compromise tradition afterwards content unfortunately spin
2. The beach was very pleasant and I had been lying in _________ there _______ the sun for hours.
VII. Fill in the blanks with words given below together with some suitable prepositions. Change the forms where necessary.
gamble 5. The operation was something of a _________, but without it it was just a matter of time before the cancer killed her. spun 6. The policeman ________ his car round and sped after the fleeing criminals.
VI. Replace the underlined parts in the following sentences with words or expressions from the text that best keep the original meaning.
专业英语(计算机)司爱侠练习版,专业英语(计算机)司爱侠练习版.docx
专业英语(计算机)司爱侠练习版,专业英语(计算机)司爱侠练习版.docx资源描述.第⼀章(1)_______:informationput into a communications system for transmission or into acomputersystem for processing.(2)______:An integrated circuit that contains the entire central processing unit of a computer ona signal chip.(3) _______: An instruction sequence in programmed instruction.(4)_______:A parallel circuit that connects the major components of a computer, allowing thetransfer of electric impulses from one connected component to any other.(5)______:A computer and the associated physical equipment directly involved in theperformance of data -processing or communications functions.(6)______:A unit of a computer that preserves data for retrieval.(7)______:The information produced by a computer from a specific input.(8)______:A basic unit of storage in a computer memory that can hold one unit of information,Such as a character or word.(9)_______:A part of the central processing unit where groups of binary digits are stored as thecomputer is processing them.(10)_______:A number used in information storage or retrieval that is assigned to a specificmemory location.Ex.3】把下列句⼦翻译为中⽂(1)He went to town with the purpose of buying a new computer.(2)Most online services have their own browsers.(3) Floppy disk may be double -density or high -density.(4) The formula then includes the addresses of the cells.(5)C might best be described as a” medium level language”.(6) Every browser has the built -in ability to understand HTML.(7)C is one of the most popular computer languages in the world.(8)Java technology is both a programming language and a platform.(9)In fact, a window manager can be thought of as a GUI for a CLI OS.(10) A database management system handles user requests for database action.Ex4〗选择适当的答案填空 (真题再现 ,程序员专业英语试题 )(1)A ___B___ is a functional unit that interprets and carries out instructions A. memoryB. processor..C. storageD. network(2)A _A_____consists of the symbols, characters, and usage rules that permit people tocommunicate with computer.A. programming languageB. networkC. keyboardD. display(3) ___A____ software, also called end -user program, includes database programs, word processors,spreadsheets etc A. Application B. SystemC. CompilerD. Utility(4)In __D_____, the only element that can be deleted or removed is the one that was inserted mostrecentlA. a lineB. a queueC. an arrayD. a stack(5)Most ___A____ measures involve data encryption and passwordA. securityB. hardwareC. displayD. program第⼆章Ex.2〗根据下⾯的英⽂解释,写出相应的英⽂词汇(1) _____:The phosphorescent surface on which an image is displayed, as on a television, computer monitor, or radar receiver(2)______:A program that observes, supervises, or controls the activities of other programs(3)______:The smallest image -forming unit of a video display(4)_______: A negatively charged electrode, as of an electrolytic cell, a storage battery, or anelectron tube.(5)_______:The glass front of a cathode -ray tube upon which the image is displayed(6)________: Electromotive force or potential difference, usually expressed in volts(7)_______:To move back and forth alternatel(8)________:Uninterrupted in time, sequence, substance, or extent.(9)________:The fineness of detail that can be distinguished in an image, as on a video displayterminal.(10)________:One of a set of symbols, such as letters or numbers, that are arranged to expres..information〖Ex.3 把下列句⼦翻译为中⽂(1) The operating system is the program that manages a computers resources 2)Computer databases typically contain aggregations of data records or files(3)Compressed files have to be extracted using a utility such as PK Zip or WinZip(4)Calling cells by just their column and row labels is called relative referencing(5) Floppies do not hold too much data, but most computers are capable of reading them(6) The World Wide Web refers to all the publically accessible documents on the Internet(7)A database management system allows control of security and data integrity requirements.Isoivob(8)Functions can be a more efficient way of performing mathematical operations than formulas(9)On larger networks, the trip from one switch point to another in the network is called a hop(10)A uniform resource locator is basically just an address for a file that can be given to a browser 〖Ex.4〗选择适当的答案填空 (真题再现 ,程序员专业英语试题 )(1)Insufficient___D__can cause a processor to work at 50% or even more below its performance potential.A. memoryB. I/0C. documentD. mouse(2)The___B___in E-mail messages has affected almost every computer around the world and has caused the damage of up to US$I billion in North AmericaA. illnessB. virusC. weaknessD. attachment(3)One of the basic rules of computer security is to change your___D____regularlyA. nameB. computerC. deviceD. password(4)One of the greatest features of a home__C____is the ability to share one Internet connectionsimultaneously over two or more computersputerB.deviceworkD.work(5)The usual address for a Web site is the page address, although you can enter___C____A. homeB. mainC. hostD. house第三章..〖Ex.2〗根据下⾯的英⽂解释,写出相应的英⽂词汇。
研究生英语综合教程(上)Unit 5课后答案
Reading Focus – Global Understanding
How to practice yoga yoga teacher or physical therapist A. Learn from _____________________________________; B. Can be strenuous; breath and heart C. Stretch and align the body while the ____________________ rate are kept slow and steady ___________________________________________________; D. Need a __________________________________, flat floor surface to stretch out on a mat or towel; E. Need concentration and ____________________________. awareness of breathing
Reading Focus – Global Understanding
Benefits of practicing yoga A. Increase _______________________________________; general health and stamina B. Reduce stress; strength, flexibility and sense of C. Increase a person’s ___________________________________ well-being _____________.
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武汉大学计算机学院《离散数学》第五次练习S 5.1.1下列二元关系中,哪些是函数?函数的值域是什么?(1)R 1 N ¢N ,R 1 t x x,y y §§x N y N x y ¤101u ;解:不是函数,因为x 0,0y R 1 x 0,1y R 1,即一对多.(2)R 2 R ¢R ,R 2 t x x,y y §§x R y R y x 2u ;解:是函数,其值域为t x §§x R x ¥0u .(3)R 3 R ¢R ,R 2 t x x,y y §§x R y R x y 2u ;解:不是是函数,因为x 1,1y R 3 x 1,¡1y R 3,即一对多.l S 5.1.2设f :N ÝÑN ,f p x q 4x ¡10,若x ¡100;f p f p x 1qq ,若x ¤100.证明(McCarthy 91function,见/wiki/McCarthy_91_function ):(1)f p 99q 91;证明:d n,90¤n 101有f p n q f p f p n 11qqf p n 11¡10q p 7n ¥906n 11¥101qf p n 1qf p 100 1q 101¡10 91(2)d n N ,0¤n ¤100,有f p n q 91.证明:用归纳法.设对任意的a ,有如果a ¤n a 11 n ¤100,则f p n q 91.这样当a ¡11¤n a n ¤100时有f p n q f p f p n 11qqf p 91q p 7a ¤n 11 a 11q由(1)有a 90时归纳基础成立,即90¤n 101时f p n q 91,由上述归纳假设,可推得89¤n 90,f p n q 91178¤n 89,f p n q 91¤¤¤¤¤¤2¤n 12,f p x q 910¤n 2,f p x q 91即0¤n 101有f p n q 91.lS 5.1.3下列函数中,哪些是单射、满射或双射?并证明你的判断:(1)f :R ÝÑR ,f p x q x 3 1:双射;(2)f :N ÝÑN ,f p x q x 1:单射;(3)f :N ÝÑN ,f p x q x mod 3:非单,亦非满;(4)f :N ÝÑt 0,1u ,f p x q 40,if x 是奇数;1,if not .:满射,非单射;(5)f :N ¢N ÝÑN ,f p m,n q m n :满射,非单射.l S 5.1.4设A 为任意集合.证明:存在从A 到P p A q 的单射.证明:定义函数f :A ÝÑP p A q ,x ÝÑt x u .设f p x q f p y q ,则t x u t y u ,即x y .故f 是单射.l S 5.1.5设f :X ÝÑY,X I X,Y I Y ,下列各式中哪些成立?哪些不成立?试证明你的判断.(1)f ¡1p Y ¡Y I q X ¡f ¡1p Y I q ;证明:f ¡1p Y ¡Y I qf ¡1p Y Y I qf ¡1p Y q f ¡1p Y I q p 由习题$5.1.6q X t x §§f p x q Y I u X t x §§f p x q Y I u X t x §§x f ¡1p Y I q uX f ¡1p Y I qX ¡f ¡1p Y I q 2(2)f p X I f¡1p Y I qq f p X I q Y I;证明:y f p X I f¡1p Y I qqðñh x X I f¡1p Y I q f p x q yðñh x X I f p x q Y I f p x q yðñy f p X I q y Y Iðñy f p X I q Y I(3)f p f¡1p Y I qq Y I;答:不成立,如X Y t a,b u,f p a q f p b q a,则t a uf p f¡1p Y qq Y t a,b u.(4)f¡1p f p X I qq X I.答:不成立,如X Y t a,b u,f p a q f p b q a,则t a,b uf¡1p f pt a uqq t a u.l S5.1.6设f:XÝÑY,A Y,B Y,证明:f¡1p A B q f¡1p A q f¡1p B q:证明:x f¡1p A B qðñf p x q A B by逆象的定义ðñf p x q A f p x q B by交集的定义ðñx f¡1p A q x f¡1p B q by逆象的定义ðñx f¡1p A q f¡1p B q by交集的定义l S5.1.7设f:XÝÑY,定义g:YÝÑP p X q,yÝÑf¡1pt y uq,证明:若f是满射,则g是单射:证明:1○f是满射,6d B Y,f p f¡1p B qq B;2○设g p y q g p y I q,则f¡1pt y uq f¡1pt y I uq;3○6f p f¡1pt y uqq f p f¡1pt y I uqq;4○由1○有:t y u t y I u;35○即:y y I .lS 5.1.10设A 和B 是非空有限集,且|A | m ,|B | n .(1)从A 到B 的不同的单射共有多少个?解:A 到B 有单射的条件是m ¤n .A 的m 元素与给定B 的m 个元素一一对应个数为m 的排列数m !.从B 中选取n 个元素的选法有组合数¢n m .这样单射的总数为m !¢n m.(2)从A 到B 的不同的满射共有多少个?解:A 到B 有满射的条件是m ¥n .首先考虑A 的m 元素放在n 个不同的桶中,且每个桶至少有一个元素有多少不同的放置方法;或者说m 个元素有多少秩为n 的划分.该数记为S p m,n q ,称为Stirling number(见http://en./wiki/Stirling_numbers_of_the_second_kind ):S p m,n q 1n !n ¸j 1p¡1q j ¢n jp n ¡j q m对每个划分按B 中m 个元素进行编号共有m !个不同的编号,这样满射共有m !S p m,n q 个.如A t 0,1,2u ,Bt a,b u .对划分t t 0u ,t 1,2u u 有2! 2个不同的函数:f 1p 0q a ,f 1p 1q f 1p 2q b ;f 2p 0q b ,f 2p 1q f 2p 2q a .而集合t 0,1,2u 的秩为2的划分有t t 0u ,t 1,2u u ,t t 1u ,t 0,2u u和t t 2u ,t 0,1u u 共3个( S p 3,2q ).故满射的总数为2!¢3 6.(3)从A 到B 的不同的双射共有多少个?解:双射的条件是m n ,双射总数为m !.lS 5.1.12证明:在任意选择的n 1个整数中,存在着两个数,它们的差能被n 整除.证明:将任意的n 1个整数组成的集合记为A t a 0,a 1,...,a n u ,定义函数f :A ÝÑt 0,1,...,n ¡1u ,x ÝÑx mod n ,而|A | n 1¡n |t 0,1,...,n ¡1u|,因此f 不可能是单射,即存在a i ,a j A a i $a j f p a i q f p a j q .这样a i mod n a j mod n ,6p a i ¡a j q mod n 0.即a i ¡a j 能被n 整除.l S 5.1.13证明:在任意的整数n ,均存在着S n 满足:S n 是n 的倍数且只含有数字0和7.4证明:考虑由n 1个元素组成的集合t7,77,777,...,777¤¤¤7looomooonn 1个u,则存在两个形如77¤¤¤7的数其差记为S n能被n整除(由题$5.1.12).而两个形如77¤¤¤7的数的差只可能由数字0和7组成.l S5.2.2设f:AÝÑA,存在正整数n使得f n 1A.证明:f是双射.证明:利用双射的充分必要条件为存在函数g:AÝÑA,使得g¥f f¥g 1A.如果n 1,则f 1A,恒等映射,即为双射.如果n¥2,则根据函数合成的结合律有f n¡1¥f f¥f n¡11A,即f为双射.l S5.2.4设n Z ,f:AÝÑA.证明:f是单射(满射、双射),则f n也是单射(满射、双射).证明:利用单射的充分必要条件为存在函数g:AÝÑA,使得g¥f 1A.利用满射的充分必要条件为存在函数g:AÝÑA,使得f¥g 1A.设f单射,则存在g:AÝÑA.g¥f 1A.这样n¥2时g n¥f n g n¡1¥p g¥f q¥f n¡1g n¡1¥1A¥f n¡1g n¡1¥f n¡1¤¤¤g¥f 1A故f n也是单射,同理可证明满射和双射时结论成立.lS5.2.5设ℎ A A,证明:d f d g p f,g A A f¥ℎ g¥ℎÑf g q当且仅当ℎ是满射:证明:ðùℎ是满射,iff,hℎI A A ℎ¥ℎI 1A;这样:if f¥ℎ g¥ℎ,then p f¥ℎq¥ℎI p g¥ℎq¥ℎI;6f¥pℎ¥ℎI q g¥pℎ¥ℎI q,即f¥1A g¥1A;6f g.ùñ反证法:设ℎ不是满射,ℎp A q A,这样存在a A a ℎp A q.设b ℎp A q,定义函数f p x q 4x if x ℎp A q;a if x ℎp A q. 5和函数g p x q 4x if x ℎp A q ;b if x ℎp A q .则f $g .但是d x A ,ℎp x q ℎp A q .这样f p ℎp x qq ℎp x qg p ℎp x qq ,即f ¥ℎ g ¥ℎ.但f $ℎ.矛盾.lS 5.2.6设ℎ A A ,证明:d f d g p f,g A A ℎ¥f ℎ¥g Ñf g q 当且仅当ℎ是单射:证明:ðùℎ是单射,iff ,h ℎI A A ℎI ¥ℎ 1A ;这样:if ℎ¥f ℎ¥g ,then ℎI ¥p ℎ¥f q ℎI ¥p ℎ¥g q ;6p ℎI ¥ℎq ¥f p ℎI ¥ℎq ¥g ,即1A ¥f 1A ¥g ;6f g ;ùñ设ℎp a q ℎp b q ,定义常数函数f :A ÝÑA,x ÝÑa,g :A ÝÑA,y ÝÑb则ℎ¥f p x q ℎp a q ℎ¥g p x q ℎp b q ,6ℎ¥f ℎ¥g ;由条件得f g ,即a b ,所以ℎ是单射.lS 5.2.7设集合A $r ,f,g A A ,若 g ¥f 是函数,则f 和g 均是单射吗?为什么?1○f 是单射:设f p x q f p y q ,则g ¥f p x q g ¥f p y q ;6 g ¥f ¥p g ¥f qp x q g ¥f ¥p g ¥f qp y q ;而 g ¥f ¥p g ¥f q 1A ,6x y ,即f 是单射;2○g 不一定是单射:设f :N ÝÑN ,x ÝÑ2x ,g :N ÝÑN ,x ÝÑ4x {2,if x 是偶数;0,if not .则g ¥f 1N ,6 g ¥f 1N 是函数,但是g 不是单射.lS 5.2.8设f :X ÝÑY ,g :Y ÝÑX ,A t x |x X f p x q g p x q u ,且i B :A ÝÑX,x ÝÑx (嵌入函数),证明:(1)f ¥i A g ¥i ;证明:d x A ,则f ¥i A p x q f p x q g p x q g ¥i A p x q ;(2)又设B X ,i B :B ÝÑX,x ÝÑx ,if f ¥i B g ¥i B ,thenB A :6证明:d x B,f¥i B p x q g¥i B p x q,then f p x q g p x q;6x A,So B A.l S5.3.2设A t1,2,3,4u:(1)试构造函数f:AÝÑA,使得f$1A f f¡1:解:f:1ÝÑ2,2ÝÑ1,3ÝÑ3,4ÝÑ4.(2)试构造函数g:AÝÑA,使得g$1A g2 g:解:g:xÝÑ2.l S5.3.3设有N到N的函数如下:f p x q 3x,g p x q 3x 1,ℎp x q 3x 2.(1)试求f,g和ℎ的一个共同的左逆元;解:定义函数k:NÝÑN,xÝÑt x{3u(下取整).则k是上述三函数的共同左逆元.(2)试构造函数g:AÝÑA,使得g$1A g2 g:解:定义函数k:NÝÑN,xÝÑt p x 1q{3u.则k是f和g的左逆元.k pℎp x qq t p3x 3q{3u x 1$x.l S5.3.4设f:XÝÑY,g:YÝÑX,若g¥f是左可逆的,则f和g一定是左可逆的吗?为什么?证明:1○g是左可逆的(满射):设ℎ:XÝÑX是g¥f的左逆元,则p g¥f q¥ℎ 1X;7f¥ℎp X q Y,6g p f¥ℎp X qq g p Y q;But g p f¥ℎp X qqp g¥f q¥ℎqp X q 1X p X q X.6g p f¥ℎp X qq X G p Y q X,即g p Y q X,所以g是满射.2○f不一定是满射:反例同练习S5.2.7.l S5.3.5设f:XÝÑY,|X|¥2,若f是可逆的,则f和g当且仅当f有唯一的左逆函数.证明:ðù根据定理双射函数的逆函数是唯一的即可证明.7ùñ反证法:设g 是f 的左逆函数,即g ¥f 1X ,则f 是单射.设f 不是满射,则存在b Y ¡f p X q $r .设g p b q a ,由于|X |¥2,则存在a I X a I $a .定义函数g I :Y ÝÑX :g I p y q 4g p y q ,若y $b ;a I ,若y b.这样g $g I ,且d x X,p g I ¥f qp x q g I p f p x qq g p f p x qq x ,即g I ¥f 1A .这样f 有两个不同的左逆函数,矛盾.ùñ反证法:设g 是f 的右逆函数,即f ¥g 1Y ,则f 是满射.设f 不是单射,则存在a,a I X a $a I f p a q f p a I q .定义函数g I :Y ÝÑX :g I p y q 4g p y q ,若y $f p a q ;a I ,若y f p a q .这样g $g I ,且d y Y ,如果y $f p a q ,则p f ¥g qp x q f p g I p y qq f p g p x qq x ,而p f ¥g I qp f p a qq f p g I p f p a qq f p a I q f p a q ,故g I ¥f 1A .这样f 有两个不同的右逆函数,矛盾.l8。