北京航空航天大学博士研究生入学考试试题一参考答案及详解

2015北京航空航天大学工程力学考博（航空科学与工程学院）参考书、历年真题、报录比、研究生招生专业目录、复试分数线一、学院介绍航空科学与工程学院（以下简称航空学院）是北航最具航空航天特色的学院之一，主要从事大气层内各类航空器（飞机、直升机、飞艇等）、临近空间飞行器、微小型飞行器等的总体、气动、结构、强度、飞行力学与飞行安全、人机环境控制、动力学与控制等方面的基础性、前瞻性、工程性以及新概念、新理论、新方法研究与人才培养工作。

航空学院前身是清华大学航空系，是1952年北航成立时最早的两个系之一，当时称飞机系（设飞机设计和飞机工艺专业），1958年更名为航空工程力学系，1970年更名为五大队，1972年更名为五系，1989年定名为飞行器设计与应用力学系，2003年成立航空科学与工程学院。

早期的航空学院荟萃了一批当时国内著名的航空领域的专家，如屠守锷、王德荣、陆士嘉、沈元、王俊奎、吴礼义、张桂联、徐鑫福、徐华舫、何庆芝、伍荣林、史超礼、叶逢培等教授，屠守锷院士（两弹一星元勋）是首任系主任，他们为本院发展奠定了坚实基础。

在北航发展史上，航空学院不断输出专业和人才，先后参与组建七系、三系、十四系、宇航学院、飞行学院、无人机所、土木工程系、交通学院等院系。

自建校以来60多年，学院已培养本科毕业生万余人，硕士毕业生两千余人，博士毕业生近千人。

毕业生中涌现出王永志、戚发韧、崔尔杰、乐嘉陵、王德臣、张福泽、王浚、钟群鹏、陶宝祺、郭孔辉、赵煦、唐西生、郭孔辉、唐长红等14位两院院士，改革开放后毕业生中也涌现出了“航空报国英模”/原沈飞董事长罗阳、中国商飞董事长金壮龙、第十一届“中国十大杰出青年”/原“神舟”飞船总指挥袁家军、歼15等飞机型号总师孙聪、C919大型客机总师吴光辉以及李玉海、耿汝光、姜志刚、屠恒章、孙聪、方玉峰、王永庆、孙兵、曲景文、李东、余后满、傅惠民、秦福光、陈元先、宋水云、吴宗琼、陈敏、高云峰等一批航空航天院所的年轻总师、总指挥、省市及部门负责人、民营企业家，为我国航空航天、国防事业及国家发展做出突出贡献。

2022年考研考博-考博英语-北京航空航天大学考试全真模拟易错、难点剖析AB卷（带答案）一.综合题(共15题)1.单选题The（）colonialists managed to wipe out the entire population.问题1选项A.aboriginalB.originalrgeD.regional【答案】A【解析】形容词辨析。

句意：（）殖民主义者们设法消灭全部人口。

aboriginal原始的，土著的；original 最早的，最初的；large大量的；regional地区的。

因此，A项aboriginal符合句意。

2.单选题The medicine（）his pain but did not cure his illness.问题1选项A.activatedB.alleviatedC.deterioratedD.mediated 【答案】B【解析】句意：这种药（）他的疼痛，但不能治愈他的疾病。

A选项activated触发；B选项alleviated 减轻，缓解；C选项deteriorated使恶化；D选项mediated调解。

选项B符合句意。

3.单选题They stood gazing at the happy（）of children playing in the park.问题1选项A.perspectiveB.viewndscapeD.scene【答案】D【解析】名词近义词辨析。

句意：他们站在那儿，凝视着在公园里玩耍的孩子们的快乐场景。

perspective 远景，透视图；view视野，风景；landscape风景，风景画；scene特定地点的景色，场景。

D项在表示场景时，场景中通常包括了其中的人物及其活动，所以本题选D。

4.单选题The reception was attended by（）members of the local community.问题1选项A.excellentB.conspicuousC.prominentD.noticeable【答案】C【解析】C选项prominent意为“突出的；著名的”。

北京航空航天大学博士研究生入学考试英语模拟试题一PART 1 Listening Comprehension (20 points) (略)PART II Reading Comprehension(30 points)Directions:There are four passages in the part. Each passage is followed by some questions or unfinished statements. For each of them, there are 4 choices marked A, B, C and D. Read the passages carefully and decide on the best choice. Then mark the corresponding letter on the ANSWER SHEET with a single line through the center.Passage 1Unless we spend money to spot and prevent asteroids(小行星) now, one might crash into Earth and destroy life as we know it, say some scientists.Asteroids are bigger versions of the meteoroids(流星) that race across the night sky. Most orbit the sun far from Earth and don't threaten us. But there are also thousands whose orbits put them on a collision course with Earth.Buy $ 40 million worth of new telescopes right now. Then spend $ 10 million a year for the next 25 years to locate most of the space rocks. By the time we spot a fatal one, the scientists say, we'll have a way to change its course.Some scientists favor pushing asteroids off course with nuclear weapons. But the cost wouldn't be cheap.Is it worth it? Two things experts consider when judging any risk are: 1) How likely the event is; and 2) How bad the consequences if the event occurs. Experts think an asteroid big enough to destroy lots of life might strike Earth once every 400, 000 years. Sounds pretty rare-but if one did fall, it would be the end of the world. "If we don't take care of these big asteroids, they'll take care of us," says one scientist. "It's that simple."The cure, though, might be worse than the disease. Do we really want fleets of nuclear weapons sitting around on Earth? "The world has less to fear from doomsday (毁灭性的) rocks than from a great nuclear fleet set against them," said a New Y ork Times article.21. What does the passage say about asteroids and meteoroids?A. They are heavenly bodies different in composition.B. They are heavenly bodies similar in nature.C. There are more asteroids than meteoroids.D. Asteroids are more mysterious than meteoroids.22. What do scientists say about the collision of an asteroid with Earth?A. It is very unlikely but the danger exists.B. Such a collision might occur once every 25 years.C. Collisions of smaller asteroids with Earth occur more often than expected.D. It's still too early to say whether such a collision might occur.23. What do people think of the suggestion of using nuclear weapons to alter the course of asteroids?A. It sounds practical but it may not solve the problem.B. It may create more problems than it might solve.C. It is a waste of money because a collision of asteroids with Earth is very unlikely.D. Further research should be done before it is proved applicable.24. We can conclude from the passage that _.A. while pushing asteroids off course nuclear weapons would destroy the worldB. asteroids racing across the night sky are likely to hit Earth in the near futureC. the worry about asteroids can be left to future generations since it is unlikely to happen in our lifetimeD. workable solutions still have to be found to prevent a collision of asteroids with Earth.25. Which of the following best describes the author's tone in this pass age?A. Optimistic.B. Critical.C. Objective.D. Arbitrary.Passage 2Believe it or not,optical illusion (错觉) can cut highway crashes.Japan is a case in point. It has reduced automobile crashes on some roads by nearly 75 percent using a simple optical illusion. Bent stripes, called chevrons (人字形)painted on the roads make drivers think that they are driving faster than they really are, and thus drivers slow down.Now the American Association Foundation for Traffic Safety in Washington D. C. is planning to repeat Japan's success. Starting next year, the foundation will paint chevrons and other patterns of stripes on selected roads around the country to test how well the patterns reduce highway crashes.Excessive speed plays a major role in as much as one fifth of all fatal traffic accidents, according to the foundation. To help reduce those accidents, the foundation will conduct its tests in areas where speed-related hazards are the greatest-curves, exit slopes, traffic circles, and bridges. Some studies suggest that straight, horizontal bars painted across roads can initially cut the average speed of drivers in half. However, traffic often returns to full speed within months as drivers become used to seeing the painted bar.Chevrons, scientists say，not only give drivers the impress ion that they are driving faster than they really are but also make a lane appear to be narrower. The result is a longer lasting reduction in highway speed and the number of traffic accidents.26. The passage mainly discusses .A. a new way of highway speed controlB. a new pattern for painting highwaysC. a new approach to training driversD. a new type of optical illusion27. On roads painted with chevrons drivers tend to feel that .A. they should avoid speed-related hazardsB. they are driving in the wrong laneC. they should slow down their speedD. they are approaching the speed limit28. The advantage of chevrons over straight, horizontal bars is that the former .A. can keep drivers awakeB. can cut road accidents in halfC. will have a longer effect on driversD. will look more attractive29. The American Association Foundation for Traffic Safety plans to .A. try out the Japanese method in certain areasB. change the road signs across the countryC. replace straight horizontal bars with chevronsD. repeat the Japanese road patterns30. What does the author say about straight, horizontal bars painted across roads?A. They are falling out of use in the United States.B. They tend to be ignored by drivers in a short period of time.C. They are applicable only on broad roads.D. They cannot be applied successfully to traffic circles.Passage 3There are a number of formats for reporting research, such as articles to appear in journals, reports addressed to funding agencies, theses or dissertations as part of the requirements for university degrees, and papers to be presented at conferences. These formats differ from one another mostly in their purposes and the audiences whom they address. We will now briefly describe them.The journal article is a way of reporting research for professional journals or edited collections. The research is reporting in a brief, yet informative way, focusing mostly on the main features of the research such as the purpose, review of the literature ( often referred to as "background" ), procedures used for carrying out the research accompanied by tables, charts, and graphs, and interpretations of the results ( often referred to as discussion).The content and emphasis of the journal article will vary according to the intended readers (research or practitioners) and it is important for the researcher to be aware of the background and interest of the readers of the journal. Articles intended to be read by practitioners will emphasize the practical implications and recommendations of the research, while articles intended to be read by researchers will describe in detail the method used to collect data, the construction of data collection procedures, and the techniques used for analyzing the data. It is important for the novice researcher to be aware of the fact that articles submitted to journals go through a process of evaluation by experts who make a judgment and recommend whether they should be published or not.The thesis or dissertation is a format for reporting research which graduate students write as part of fulfilling the requirements for an advanced academic degree. The student is expected to describe in great detail all the phases of the research so it can be examined and evaluated carefully by the reader. Thus the thesis or dissertation includes the purpose and significance of the study, the rationale, a thorough review of the literature, detailed information as to the research tools and the procedures involved in their development, a description of data analysis and the results, and an interpretation of the results in the form of conclusions, implications, and recommendation. Thisdetailed description of the process of the research is needed to provide the professors with an indication of the student's ability to carry out research.The conference paper is a way of reporting research at conferences, seminars and colloquia. At such meetings research papers are usually presented orally. They are similar to the research 'article since research is reported in a concise, yet informative way, focusing on the most essential elements of the research. Handouts and transparencies can also accompany the presentations. As with the research article, here too, the content and emphasis of the oral report will depend to a large extent on the type of audience present at the meeting .and whether they are researchers or practitioners.31. The best title for this passage could beA. Types of Research ReportsB. Types of Journal ArticlesC. Writing of research ReportsD. Writing of Different Artic les32. The common aspect for the journal articles, theses and conference papers lies in thatA. they are all for the practitionersB. they are all to be read by researchersC. they are all for being publishedD. they are all forms of reporting research33. We can distinguish those research reports from each other mainly throughA. their writing style and lengthB. their aims and possible audiencesC. their presented places and timeD. their content and purposes34. Which of the following statements is NOT mentioned in this passage?A. Both journal articles and conference papers are reported in a brief and informative way.B. All the theses or dissertations and conference papers are reported in spoken languages.C. Both the journal articles and conference papers are influenced greatly by the intended receivers.D. The various formats of research reports may be presented in different ways.35. How can a professor evaluate a student's capability of implementing the research?A. By concentrating on the main factors like the purpose, background, procedures and discussion.B. By emphasizing the practical implications and recommendations of the research.C. By focusing on the detailed description of the process of the research such as the tools, procedures, the process of data analysis, the results, conclusions, etc.D. By noticing the detailed method used to collect the data, the construction of the data collection procedures, the techniques for analyzing the date and results, etc.Passage 4In recent years, many Americans of both sexes and various ages have become interested in improving their bodies. They have become devoted to physical fitness. The need to exercise has almost become compulsive with many persons who have a strong desire to be more physically fit.By nature, Americans are enthusiastic and energetic about their hobbies and pastimes. They apply this enthusiasm, and energy to jogging/running. As a result, there are running clubs to join andmany books and magazines to read about running.The desire to be physically fit is explained by a "passion" for good health. The high rate of heart attacks in the 1960s caused an increase on the part of the public in improving the human body.Middle-aged men especially suffer from heart attacks. Thus, they are one group strongly interested in more physical exercise. In fact, many doctors encourage their patients to become more physically active, especially those who have sedentary jobs. It is interesting to note that the rate of heart attacks began to decrease in the 1970s and it is still decreasing.Physical fitness currently enjoys a favored role in the United States. It is a new "love" that many Americans have cherished. Will it last long? Only time will tell or until another "new passion" comes along.36. In recent years, many Americans have become interested in improving their bodies becauseA. they are enthusiastic about their hobbies and pastimesB. they have a strong desire to be more physically fitC. there are many running clubs to joinD. there are many books and magazines to read about running37. The passage implies that is a great favorite of many Americans, men and women, old and young.A. jogging/runningB. joining running clubsC. reading books and magazines about runningD. going in for all kinds of sports38. Middle-aged men suffering from heart attacksA. are compulsive joggersB. are encouraged by their doctors to go in for jogging/runningC. are interested in taking more physical exerciseD. are enthusiastic and energetic about hobbies and pastimes39. In the sentence "In fact, many doctors encourage their patients to become more physically active, especially those who have sedentary jobs", the word "sedentary" meansA. involving physical workB. needing much sittingC. energy-consumingD. sleep-producing40. According to the passage, will the love for physical exercise last long for Americans?A. Y es.B. No.C. Somebody can tell.D. It is hard to tell.PART III Vocabulary (10 points)Directions: In this part, there are 20 sentences with four choices below each sentence. Choose the best one from the 4 choices. Then mark the corresponding letter oil the ANSWER SHEET witha single line through the center.41. Not until the game had begun __ at the sports ground.A. should he have arrivedB. had he arrivedC. did he arriveD. would he had arrived42. Neither at this meeting nor at the previous one _ the proposal.A. they did not discussB. did they discussC. do they discussD. would they discuss43. The molecules of gases move more freely than __A. do liquids and solidsB. liquids and solids doC. do those of liquids and solidsD. those do of liquids and solids44. The taller the container, _________ at the bottom.A. the greater will the water pressure beB. the water pressure will be greaterC. the greater will be the water pressureD. greater the water pressure will be45. from the tenth floor when the policeman pointed his pistol at him.A. Jumped down the burglarB. Down the burglar jumpedC. The burglar jumped downD. Down jumped the burglar46. To the north of the city __ a small island.A. lainB. liesC. was thereD. there lays47. she first heard of the man referred to as a specialist.A. That was from StephenB. It was Stephen whomC. It was from Stephen thatD. It was Stephen that48. Was it __ the professor regarded with such contempt?A. them whoB. them whomC. he whoD. those49. __ the Europeans began to learn how to use the compass on their ships.A. It was not until the 12th century whenB. Hardly it was the 12th century thanC. No sooner it was the 12th century whenD. It was not until the 12th century that50. When I try to understand _ _ that prevents so many Americans from being as happy as one might expect, it seems to me that there are two causes.A. why it doesB. what it doesC. what it isD. why it is51. More often it is the President, and not the members of his cabinet, __ the populace.A. who appeal toB. to whom appeal toC. whom appeals toD. who appeals to52. On the large board in the main hall of the airport .you can easily find the different Destinations __which airlines can take you.A. inB. ofC. toD. by53. Not until actually faced with water scarcity __ appreciate the value of water to a region.A. one canB. one can notC. can oneD. can not one54. Most people don't think of a stamp as a receipt, but that is __ it really is a proof of just how much money you have paid in advance for mail delivery.A. whatB. whyC. howD. who55. Without water from the Nile River, Egypt __ a farming country and become a desert.A. will cease to beB. would cease to beC. will cease beingD. would cease being56. Although he refused to act on my suggestion, he had to admit that what I said.A. it was something inB. there was something asC. it was something asD. there was something in57. There is little, __, farming in that area and all you can see is miles of wild countryside.A. if soB. if suchC. if notD. if any58. In his lecture, the education expert emphasized the fact that nowadays children are exposed to many influences that of their families.A. rather thanB. other thanC. except forD. but for59. The singer on the stage has a young __ face and a voice of an __A. boy...angelB. boy's…angelC. boy…ang el'sD. boy's…angel's60. A new material __, we have good reason to be optimistic.A. developedB. being developedC. was being developedD. was developed PART IV Cloze (10 points)Directions: In this part, there are incomplete sentences in the following passage. For each sentence there arefour choices marked A, B, C and D. Choose the one that best completes the sentence. Then mark the corresponding letter on the Answer Sheet with a single line through the center.What attracts customers? Obviously the quality of a product does, but visual images 61a great deal. It is not only the image provided by the packaging that 62 but the whole corporate63 of the company. There are now many products and services on the market which are similar in content 64 produced by different companies. It is vital, therefore, for a company to 65 itself from its competitors by having a strong company image which is immediately 66 Logos are part of this image. They are 67 which often include a name or initials to identify a company. The logo establishes a 68 identity for the company, just as different groups of young people express their identity through hairstyles and clothes. All groups from all cultures and 69 the ages have used colors and symbols to show their identity. In different cultures, different colors 70 different meanings. Some colors may be connected with coldness in one culture and with 71 in another:some colors represent 72 in one culture but death in another. International companies have, 73 , to make sure that their logos will not be misunderstood or misinterpreted in different countries.Many companies have, over the years, 74 their logos to fit in with contemporary design and to present more powerful images. Company logos can be emotive and can 75 loyalty by 76 the instinct. Some logos 77 an idea of the product, and a case in point is the steering wheel in the Mercedes logo. Logos are used on letterheads, packaging and 78 as well as on the product itself. They may also appear in newspapers or on television as part of an advertising 79 .Companies need to have a strong corporate identity. The logo helps to promote this image andto fix it in the minds of the 80 . Logos, therefore, need to be original and to have impact and style.61. A. attribute B. contribute C. devote D. attract62. A. concerns B. involves C. counts D. means63. A. features B. quality C. identity D. status64. A. instead B. and C. though D. as65. A. exist B. isolate C. hold D. distinguish66. A. observable B. differentiable C. recognizable D. accountable67. A. symbols B. signs C. signals D. indications68. A. visible B. visual C. brief D. explicit69. A. in B. throughout C. for D. between70. A. contain B. carry C. predominate D. convey71. A. mildness B. consolation C. affection D. warmth72. A. life B. love C. live D. alive73. A. otherwise B. still C. therefore D. additionally74. A. continued B. kept C. changed D. refreshed75. A. promote B. inspire C. prompt D. stir76. A. regarding B. impressing C. influencing D. effecting77. A. combine B. collaborate C. incorporate D. blend78. A. covers B. brochures C. contents D. volumes79. A. movement B. plan C. campaign D. function80. A. consumers B. employers C. reporters D. manufacturersPART V T ranslation (15 points)Directions:Read the following passage carefully and then translate it into Chinese. Write your translation on the ANSWER SHEET (2).The fact known to us is that war, different from what many people believe it to be, is not completely an outcome of" humanity". Otherwise，war and violence among people would exist in all the human history or ahnost all societies. However, this is not the truth. Archaeologists' investigation results seem to suggest that men lived quite a peaceful life long ago. For example, among ancient French cave drawings which were earlier than 10, 000 B. C., there were no pictures describing people fighting with each other. This indicates that, in that early period of mankind, fight among people was comparatively rare.In a certain way, this discovery is not surprising at all:in the world of animals, it's rare for one to prey on another of its own species. They do kill other kinds of animals, but not their own. Like most animals, the proportion of inner violence among early human beings was relatively small. Therefore, war is not the inherent outcome of humanity but that of certain social and cultural conditions.PART VI Writing(15 points)Directions:A. Study the following graph carefully and write an essay in 200 words.B. Your essay should meet the requirements below.Outline:1. Interpret the graph.2. Suggest counter-measures.3. Give advice for jobseekers.参考答案及解析21．B 依据文章第二段第1行可以判断出两者性质相似只是体积不同，排除A项；文中并无两者数量上的比较，排除C项；也没有涉及D项的内容。

北京航空航天大学考博英语阅读真题及其解析Education is an absolute imperative in the emerging globalknowledge society,so new ways of providing access to education fora much higher percentage of the population are now being devised.The most dramatic examples of access to education are found inthe11distance-education mega-universities found around the world.In"distance education,"the student is separated in time or spacefrom the teacher or professor.The largest of these high enrollmentuniversities is in China,the China Central Radio and TelevisionUniversity,with more than3million students.The English-speakingworld has the British Open University,with215,000students,and theUniversity of South Africa,with120,000students.In addition to themega-universities,dozens of other national and regional systems areproviding education at all levels to students.The base delivery system for the distance-education Geng duo yuanxiao wan zheng kao bo ying yu zhen ti ji qi jie xi qing lian xi quanguo mian fei zi xun dian hua:si ling ling liu liu ba liu jiu qi ba,huojia zi xun qq:qi qi er liu qi ba wu san qi mega-universities istelevision,supplemented by other technologies or even some onsiteinstruction in more-developed countries.Some distance-educationsystems use two-way interactive video connections to particularlocations where students gather;others supplement with the Internet,and still others deliver only by Internet.Withvideo-and-audio-streaming now available,the Internet appears to bethe technology of choice for systems where students have access to computers.Of course,these technologies merely add to the radio--delivered courses that have been offered for years in many countries around the world.The programs and courses offered vary from basic literacy courses to the highest graduate-level programming.Hundreds of university degrees are now available through distance education,where90%or more of the required credits are given at a distance,as are dozens of master's degrees and a small number of accredited doctoral degrees. One estimate suggests that50,000university-level courses are now available through distance-education delivery systems.There will be two main types of educational institutions:those that add value in coursework and those that are certifying agencies. The certifying colleges and universities are those that act as educational bankers for students.Students will earn credits from many places and have the credits or certifications of completion sent to the certifying university,then that certifying university will award the degree when enough credits of the right type have been accumulated.Regent's College of the University of the State of New York and Thomas Edison College of New Jersey are public certifying institutions that give accredited degrees.One vision for some of the remaining residential colleges in the United States,now serving mainly the18-to-23-year-old population, is that many will become certifying colleges.Students will come tothe colleges for their social,artistic,athletic,and spiritual programs.The basic commodity these colleges will sell is membership in the college community.Students will access their courses from colleges and universities around the world,transfer the credits to the college,then gain a degree.Faculty members will serve as tutors and advisers and may provide some courses live.(479words)51.What is the passage mainly about?[A]The emerging global knowledge society[B]Distance-education mega-universities[C]The largest of these high enrollment universities[D]Two main types of educational institutions52.It may be inferred that the Internet could be the technology of choice in_______.[A]the China Central Radio and TelevisionUniversity[B]the University of South Africa[C]the British Open University[D]the English-speaking world53.We learn from the passage that the distance-education programs may offer all the following EXCEPT______.[A]virtually all the basic literacy courses and the highest graduate-level programming[B]nearly90%of the required credits[C]courses for master's degrees and accredited doctoral degrees[D]50,000university-level courses54.The residential colleges in the United States______.[A]serve only the18-to-23-year-old population[B]provide students with social,artistic,athletic,and spiritual programs[C]provide courses from colleges and universities around the world[D]may provide a lot of faculty members to conduct courses lively55.Judging from the context we know that a mega-universityis_______.[A]the largest of these high enrollment universities[B]the China Central Radio and TelevisionUniversity[C]the British Open University[D]a university with very large number of studentsText1151. B.远程教育的百万人大学。

北京航天航空大学考博英语模拟试卷1(题后含答案及解析)题型有：1. Reading Comprehension 2. Structure and V ocabulary 3. Cloze 4. English-Chinese Translation 5. WritingReading ComprehensionThere are a great many careers in which the increasing emphasis is on specialization. You find these careers in engineering, in production, in statistical work, and in teaching. But there is an increasing demand for people who are able to take in great area at a glance, people who perhaps do not know too much about any one field. There is, in other words, a demand for people who are capable of seeing the forest rather than the trees, of making general judgments. We can call these people “generalists. “And these “generalists”are particularly needed for positions in administration, where it is their job to see that other people do the work, where they have to plan for other people, to organize other people’s work, to begin it and judge it. The specialist understands one field; his concern is with technique and tools. He is a “trained” man; and his educational background is properly technical or professional. The generalist —and especially the administrator —deals with people; his concern is with leadership, with planning, and with direction giving. He is an “educated” man; and the humanities are his strongest foundation. Very rarely is a specialist capable of being an administrator. And very rarely is a good generalist also a good specialist in particular field. Any organization needs both kinds of people, though different organizations need them in different proportions. It is your task to find out, during your training period, into which of the two kinds of jobs you fit, and to plan your career accordingly. Your first job may turn out to be the right job for you —but this is pure accident. Certainly you should not change jobs constantly or people will become suspicious of your ability to hold any job. At the same time you must not look upon the first job as the final job; it is primarily a training job, an opportunity to understand yourself and your fitness for being an employee.1．There is an increasing demand for______.A．all round people in their own fieldsB．people whose job is to organize other people’s workC．generalists whose educational background is either technical or professional D．specialists whose chief concern is to provide administrative guidance to others正确答案：B解析：第一段第三、四句指出，对“一眼即能看到很大范围，可能对任一领域都知之不多；能够看到森林而不是树木，能够做出总体判断”的人的需求在日益增加。

一（15分）计算 (1) 已知A 可逆，求10d Ate t ⎰（用矩阵A 或其逆矩阵表示）； （2）设1234(,,,)Ta a a a =α是给定的常向量，42)(⨯=ij x X 是矩阵变量，求Td()d X αX ；（3）设3阶方阵A 的特征多项式为2(6)I A λλλ-=-，且A 可对角化，求kk A A ⎪⎪⎭⎫⎝⎛∞→)(lim ρ。

二（15分）设微分方程组d d (0)xAx t x x ⎧=⎪⎪⎨⎪⎪=⎩，508316203A ⎛⎫ ⎪= ⎪ ⎪--⎝⎭，0111x ⎛⎫ ⎪= ⎪ ⎪⎝⎭（1）求A 的最小多项式)(λA m ； （3）求Ate ； （3）求该方程组的解。

三（15分）对下面矛盾方程组b Ax =312312111x x x x x x =⎧⎪++=⎨⎪+=⎩ （1）求A 的满秩分解FG A =； （2）由满秩分解计算+A ；（3）求该方程组的最小2－范数最小二乘解LS x 。

四（10分）设1113A ⎫=⎪⎭求矩阵A 的QR 分解（要求R 的对角元全为正数，方法不限）。

五（10分） 设(0,,2)TnA R n αβαβ=≠∈≥ （1）证明A 的最小多项式是2()tr()m A λλλ=-；（2）求A 的Jordan 形（需要讨论）。

六（10分）设m n r A R ⨯∈，（1）证明rank()n I A A n r +-=-；（2）0Ax =的通解是(),n n x I A A y y R +=-∀∈。

七（10分）证明矩阵2121212311122222224333333644421(1)(1)n n n n n n n n n n ---⎛⎫ ⎪⎪ ⎪ ⎪⎪= ⎪ ⎪⎪ ⎪ ⎪ ⎪+++⎝⎭A （1）能与对角矩阵相似；（2）特征值全为实数。

八（15分） 设A 是可逆矩阵，11,B A Aαβ-=-=（这里矩阵范数都是算子范数）， 如果βα<，证明（1）B 是可逆矩阵；（2）11B αβ-≤-；（3）11()B A βααβ---≤-。

北京航空航天大学2008年博士研究生入学考试试题题单号：101英语考生注意：所有答题务必写在考场提供的答题纸上，写在本试题单上的答题一律无效（本题单不参与阅卷）。

Parts Ⅰ Listening Comprehension（20points）Section A（10%）Directions：In this section, you will hear 10 short conversations. At the end of each conversation a question will be asked about what was said. Both the conversation and the question will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A, B, C andD and decide which is the best answer. Then mark the corresponding letter on ANSWER SHEET1.1. A. Mary lost the photo album。

B. It’s difficult to take photographs indoors.C. The photo album is in the living room.D. Mary is a good photographer.2. A. The job’s short hours make it impossible for her to refuse.B. She’s looking forward to meeting her new colleagues.C. She refused the position because of the low salary.D. The job is turning into an excellent opportunity for her.3. A. Take the man to the station.B. Find out when the next bus leaves.C. Show the man the way to the station.D. Look after the man’s things.4. A. He has to do what is necessary in order to learn.B. He doesn’t have to memorize all the vocabulary.C. There’s not much he can learn by memorizing.D. He knows the whole vocabulary list already.5. A. He hasn’t had time to try it on yet.B. It doesn’t fit him very well.C. He needs a long-sleeved shirt.D. He’s not sure he likes the pattern.6. A. She doesn’t think it will snow.B. The location of session has been changed.C. The session might be canceled.D. She’ll probably be too tired to walk to the session.7. A. Use bleach on his socks.B. Buy new white socks.C. Wash his red T-shirt again.D. Throw away his pink socks.8. A. He hasn’t talked to his brother since he transferred.B. He doesn’t think his brother should transfer.C. His brother doesn’t want to transfer.D. He hadn’t heard the news about his brother.9. A. Which seminar the woman wants to sign up for.B. If the woman keeps money at the bank.C. Where the woman learned about the seminar.D. If the woman has taken other classes on personal finances.10. A. He’s used to cold weather.B. He expected the weather to be warmer over the weekend.C. He has never liked the weather in October.D. He didn’t see the forecast for the weekend.Section B (10%)Directions: In this section you will hear 2 passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear one question, you must choose the best answer from the four choices marked A, B , C and D. Then mark the corresponding letter on ANSWER SHEET 1.11.A. The unemployment rate was the lowest in modern times.B. Inflation was the lowest in 50 years.C. Home ownership was the highest in the country’s history.D. A budget surplus was achieved.12. A. On the day he was born.B. When he was four years old.C. When he was in high school.D. When he was in Georgetown University.13. A. A professional musician.B. A professor.C. An actor.D. A lawyer.14. A. George Washington.B. Abraham Lincoln.C. Franklin Roosevelt.D. John Kennedy.15. A. Positive.B. Negative.C. Neutral.D. Hostile.16. A. 40,000.B. 14,000.C. 400,000.D. 140,000.17. A. On October 18, 1955.B. On October 28, 1955.C. On October 18, 1958.D. On October 28, 1958.18. A. In 1973.B. In 1974.C. In his junior year.D. In his senior year.19. A. His dream of making more profit.B. His mother’s advice.C. A belief the computer would be a valuable tool on every office desktop and in everyhome.D. The suggestion of his friends.20. A. Eight weeks.B. Seven weeks.C. Six weeks.D. Five weeks.Part Ⅱ Reading Comprehension (30 points)Directions:There are four passages in this part. Each passage is followed by some questions or unfinished statements. For each of them, there are 4 choices marked A, B, C, D. Read the passages carefully and decide on the best choice. Then mark the corresponding letter on ANSWER SHEET 1.Passage 1There has been a lot of hand-writing over the death of Elizabeth Steinberg. Withoutblaming anyone in particular, neighbors, friends, social workers, the police and newspapereditors have struggled to define the community’s responsibility to Elizabeth and to otherbattered children. As the collective soul-searching continues, there is a pervading sense that thesystem failed her.The fact is, in New York State the system couldn’t have saved her. It is almost impossible to protect a child from violent parents, especially if they are white, middle-class, well-educated and represented by counsel.Why does the state permit violence against children? There are a number of reasons. First, parental privilege is a rationalization. In the past, the law was giving its approval to the biblical injunction against sparing the rod.Second, while everyone agrees that the state must act to remove children from their homes when there is danger of serious physical or emotional harm, many child advocates believe that state intervention in the absence of serious injury is more harmful than helpful.Third, courts and legislatures tread carefully when their actions intrude or threaten to intrude on a relationship protected by the Constitution. In 1923, the Supreme Court recognized the “liberty of parent and guardian to direct the upbringing and education of children under their control.” More recently, in 1977, it upheld the teacher’s privilege to use corporal punishment against schoolchildren. Read together, these decisions give the constitutional imprimatur to parental use of physical force.Under the best conditions, small children depend utterly on their parents for survival. Under the worst, their dependency dooms them. While it is questionable whether anyone or anything could have saved Elizabeth Steinberg, it is plain that the law provided no protection.To the contrary, by justifying the use of physical force against children as an acceptable method of education and control, the law lent a measure of plausibility and legitimacy to her parents’ conduct.More than 80 years ago, in the teeth of parental resistance and Supreme Court doctrine, the New York State Legislature acted to eliminate child labor law. Now, the state must act to eliminate child abuse by banning corporal punishment. To break the vicious cycle of violence, nothing less will answer. If there isa lesson to be drawn from the death of Elizabeth Steinberg, it is this: Spare the rod and spare the child.21. The New York State law seems to provide least protection of a child from violent parentsof .A. a family on welfareB. a poor uneducated familyC. an educated black familyD. a middle-class white family22. “Sparing the rod” (黑体部分)means .A.childrenspoilingB. punishing childrenC. not caring about childrenD. not beating children23. Corporal punishment against schoolchildren is .A. taken as illegal in the New York StateB. considered being in the teacher’s provinceC. officially approved by lawD. disapproved by school teachers24. From the article we can infer that Elizabeth Steinberg is probably the victim of .A. teachers’ corporal punishmentB. misjudgment of the courtC. parents’ ill-treatmentviolencestreetD.25. The writer of this article thinks that banning corporal punishment will in the long run .A. prevent violence of adultsB. save more childrenC. protect children from ill-treatmentD. better the systemPassage 2For laymen ethnology is the most interesting of the biological sciences for the very reason that it concerns animals in their normal activities and therefore, if we wish, we can assess the possible danger and advantages in our own behavioral roots. Ethnology also is interesting methodologically because it combines in new ways very scrupulous field observations with experimentation in laboratories.The field workers have had some handicaps in winning respect for themselves. For a long time they were considered as little better than amateur animal-watchers—certainly not scientists, since their facts were not gained by experimental procedures: they could not conform to the hard-and-fast rule that a problem set up and solved by one scientist must be tested by other scientists, under identical conditions and reaching identical results. Of course many situations in the lives of animals simply cannot be rehearsed and controlled in this way. The fall flocking of wild free birds can’t be, or the roving animals over long distances, or even details of spontaneous family relationships. Since these never can be reproduced in a laboratory, they are then not worth knowing about?The ethnologists who choose field work have got themselves out of this impasse by greatly refining the techniques of observing. At the start of a project all the animals to be studied are live-trapped, marked individually, and released. Motion pictures, often in color, provide permanent records of their subsequent activities. Recording of the animals’ voices by electrical sound equipment is considered essential, and the most meticulous notes are kept of all that occurs. With this material other biologists, far from the scene, later can verify the reports. Moreover, two field observers often go out together, checking each other’s observations right there in the field.Ethnology, the word, is derived from the Greek ethos, meaning the characteristic traits or featureswhich distinguish a group-any particular group of people or, in biology, a group of animals such as a species. Ethnologists have the intention of studying “the whole sequence of acts which constitute an animal’s behavior.” In abridged dictionaries, ethnology is sometimes defined simply as “the objective study of animal behavior,” and ethnologists do emphasize their wish to eliminate myths.26. In the first sentence, the word “laymen” means .A. people who stand asideB. people who are not trained as biologistsC. people who are amateur biologistsD. people who love animals27. According to the passage, ethnology is .A. a new branch of biologyB. an old Greek sciencescienceforamateurspseudo-science D.aC.a28.“The field workers have handicaps in winning respect for themselves.” This sentence means .A. ethnologists when working in the field are handicappedB. ethnologists have problems in winning recognition as scientistsC. ethnologists are looked down upon when they work in the fieldD. ethnologists meet with lots of difficulties when doing field work29. According to the explanation of the scientific rule of experiment in the passage, “hand-and-fast” means experiment procedures .A. are difficult and quick to followB. must be carried out in a strict and quick wayC. must be followed strictly to avoid false and loose resultsD. hard and unreasonable for scientist to observe30. The meaning of the underlined words in “the details of spontaneous family relationships” can be expressed as .A. natural family relationshipsoccurringfamily relationshipsquicklyB.C. animals acting like a natural familyD. animal family behavior that cannot be preplanned or controlledPassage 3Since the dawn of human ingenuity, people have devised ever more cunning tools to cope with work that is dangerous, boring, burdensome, or just plain nasty. That compulsion has resulted in robotics- the science of conferring various human capabilities on machines. And if scientists have yet to create the mechanical version of science fiction, they have begun to come close.As a result, the modern world is increasingly populated by intelligent gizmos whose presence we barely notice but whose universal existence has removed much human labor. Our factories hum to the rhythm of robot assembly arms. Our banking is done at automated teller terminals that thank us with mechanical politeness for the transaction. Our subway trains are controlled by tireless robot-drivers. And thanks to the continual miniaturization of electronics and micro-mechanics, there are already robot systems that can perform some kinds of brain and bone surgery with sub-millimeter accuracy—far greater precision than highly skilled physicians can achieve with their hands alone.But if robots are to reach the next stage of laborsaving utility, they will have to operate with less human supervision and be able to make at least a few decisions for themselves—goals that pose a real challenge. ”While we know how to tell a robot to handle a specific error,” says Dave Lavery, manager of a robotics program at NASA,“We can’t yet give a robot enough ‘common sense’ to reliably interact with adynamic world.”Indeed the quest for true artificial intelligence has produced very mixed results. Despite a spell of initial optimism in the 1960s and 1970s when it appeared that transistor circuits and microprocessors might be able to copy the action of human brain by the year 2010, researchers lately have begun to extend that forecast by decades if not centuries.What they found, in attempting to model thought, is that the human brain’s roughly one hundred billion nerve cells are much more talented-and human perception far more complicated—than previously imaged. They have built robots that can recognize the error of a machine panel by a fraction of a millimeter in a controlled factory environment. But the human mind can glimpse a rapidly changing scene and immediately disregard the 98 percent that is irrelevant, instantaneously focusing on the monkey ate the side of a forest road or the single suspicious face in big crowd. The most advanced computer systems on Earth can’t approach that kind of ability, and neuroscientists still don’t know quite how we do it.31. Human ingenuity was initially demonstrated in .A. the use of machines to produce science fictionB. the wide use of machines in manufacturing industryC. the invention of tools for difficult and dangerous workD. the elite’s cunning tackling of dangerous and boring work32. The word “gizmos” (line 1, paragraph 2) most probably means .programsA.expertsB.devicesC.creaturesD.33. According to the text, what is beyond man’s ability now is to design a robot that can .A. fulfill delicate tasks like performing brain surgeryB. interact with human beings verballyC. have a little common senseD. respond independently to a changing world34. Besides reducing human labor, robots can also .A. make a few decisions for themselvesB. deal with some errors with human interventionC. improve factory environmentsD. cultivate human creativity35. The author uses the example of a monkey to argue that robots are .A. expected to copy human brain in internal structureB. able to perceive abnormalities immediatelyC. far less able than human brain in focusing on relevant informationD. best used in a controlled environmentPassage 4When it comes to the slowing economy, Ellen Spero isn’t biting her nails just yet. But the 47-year-old manicurist isn’t cutting, filling or polishing as many nails as she’d like to either. Most of her clients spend $12 to $50 weekly, but last month two longtime customers suddenly stopped showing up. Spero blames the softening economy. “I’m a good economic indicator,” she says. “I provide a service that people can do without when they’re concerned about saving some dollars.” So Spero is downscaling, shopping at middle-brow Dillard’s department store near her suburban Cleveland home, instead of Neiman Marcus. “Idon’t know if other clients are going to abandon me, too” she says.Even before Alan Greenspan’s admission that America’s red-hot economy is cooling, lots of working folks had already seen signs of the slowdown themselves. From car dealerships to Gap outlets, sales have been lagging for months as shoppers temper their spending. For retailers, who last year took in 24 percent of their revenue between Thanksgiving and Christmas, the cautious approach is coming at a crucial time. Already, experts say, holiday sales are off 7 percent from last year’s pace. But don’t sound any alarms just yet. Consumers seem only concerned, not panicked, and many say they remain optimistic about the economy’s long-term prospects, even as they do some modest belt-tightening.Consumers say they’re not in despair because, despite the dreadful headlines, their own fortunes still feel pretty good. Home prices are holding steady in most regions. In Manhattan, “there’s a new gold rush happening in the $4 million to $10 million range, predominantly fed by Wall Street bonuses,” says broker Barbara Corcoran. In San Francisco, prices are still rising even as frenzied overbidding quiets. “Instead of 20 to 30 offers, now maybe you only get two or three,” says john Deadly, a Bay Area real-estate broker. And most folks still feel pretty comfortable about their ability to find and keep a job.Many folks see silver lining to this slowdown. Potential home buyers would cheer for lower interest rates. Employers wouldn’t mind a little fewer bubbles in the job market. Many consumers seem to have been influenced by stock-market swing, which investors now view as a necessary ingredient to a sustained boom. Diners might see an upside, too. Getting a table at Manhattan’s hot new Alain Ducasse restaurant need to be impossible. Not anymore. For that, Greenspan & Co.may still be worth toasting.36. By “Ellen Spero isn’t biting her nails just yet” (Line 1, Paragraph 1), the author means .A. Spero can hardly maintain her businessB. Spero is too much engaged in her workC. Spero has grown out of her bad habitD. Spero is not in a desperate situation37. How do the pubic feel about the current economic situation?ConfusedA.B.OptimisticPanickedCarefree D.C.38. When mentioning “the $4 million to $10 million range”(Lines 3-4, Paragraph 3) the author is talking about .A. gold marketB. real estateC. stock exchangeD. venture investment39. Why can many people see “silver linings” to the economic slowdown?A. They would benefit in certain ways.B. The stock market shows signs of recovery.C. Such a slowdown usually precedes a boom.D. The purchasing power would be enhanced.40. To which of the following idea is the author likely to agree?A. A now boom, around the corner.B. Tighten the belt, the single remedy.C. Caution all right, panic not.D. The more ventures, the more chances.Part Ⅲ Vocabulary (10 points)Directions:In this part, there are 20 sentences with four choices below each sentence. Choose the best one from the 4 choices. Then mark the corresponding letter on ANSWER SHEET 1.41. The statement was an allusion to recent troubles with the agency’s computers.A. an explanationB. a contradictionC. a referenceD. a rejection42. A judge who is lenient will not punish people severely.loosemerciful B.A.sincere D.lunaticC.43. A balmy breeze came in and made us all feel refreshed.B.stronggentleA.D.fairywarmC.44. There is controversy even among doctors as to whether this disease is contagious or not.A. incisiveB. infertileC. allergicD. communicable45. The poem admirably expresses complicated nuance of feeling.innocenceB.annoyanceA.C. slight differenceD. great nuisance46. They believed that the merchants had conspired to undermine the nation’s economic independence.minimizeuphold B.A.C. weakenD. postpone47. Miss Black, an heir to a large fortune, is serving a life term.A. sentenceB. convictionofficeduty D.C.48. When doing business with an Arab, you have to endure hours of small talk, waiting for the topic of commerce to be broached.brokenA.B.raisedconcludedD.C.solved49. The ink had faded with time and so parts of the letter were illegible.illegitimateilliterate B.A.indecipherableD.C.inscrutable50. The process of respiration consists of two independent actions: inhaling and exhaling.recitingspeaking B.A.smelling D.breathingC.51. A briefcase full of counterfeit money was found on the counter.currencyB.A.forgedD.cashsubstitutedC.52. I hate to see the repulsive sights in commercials about cold remedies.A. soothingB. hypocriticaldeceitfulD.loathsomeC.53. Every of a motion picture is the responsibility of the director.A. sectionB. facetC. characterD. footage54. The criminal past a guard and managed to escape.stoleA. stormedB. sneezedC.sneaked D.55. Future scientific discoveries will make possible the further prolongation of the human life .pursuit D.spanC.well-beingcondition B.A.56. The sport of wrestling tests , strength, and stamina.A. agilityB. coordinationC. tacticsD. courage57. The travelers were into silence by the sight of a distant mountain.A. enlivenedB. awedC. forcedD. frightened58. What is missing from TV news would fill a book.A. coverageB. disseminationC. declarationD. consultation59. English in idioms, and so does Chinese.A. catersB. existsC. remainsD. abounds60. The university has sought to a special fund for physically disabled students.A. administerB. complimentC. performD. institutePart Ⅳ Cloze(10 points)Directions: In this part, there are 20 blanks in the following passage. For each blank there are four choices marked A, B, C and D. Choose the one that best completes the blank. Then mark the corresponding letter on ANSWER SHEET 1.An Ohio State University study has linked behavior in young children 61 the type of job their mother has. Mothers with complex occupations that are self-directed and require working with other people 62 to have offspring with relatively low levels of behavior problems. The opposite held 63 when the jobs were routine, closely supervised, and dealt with things, rather than people.“A job that challenges and interests a mother and gives her an opportunity to exercise judgment and solve problems clearly has 64 consequences for her children’s behavior,” indicates 65 professor of sociology Elizabeth Mengaghan. Occupations with more positive conditions include management, sales, and teaching positions. Jobs that may be related to increased child behavior problems include book keeping, food service, and 66 line positions.Women who are supervised closely at work and made to 67 strict orders may be more likely to use this same style in 68 their kids. They may emphasize obedience to parental authority and the potential for 69 punishment. “We believe that the choice of such a parenting style may increase the 70 of behavior problems in children.” On the 71 hand, mothers whose jobs are less controlled by supervisors and 72 must work closely with other people probably rely less on physical punishment, 73 encouraging children to think about consequences of their actions and 74 responsibility for their behavior. 75 an approach encourages youngsters to follow parental demands 76 they aren’t being supervised because they have accepted parental values as their own. Moreover, mothers whose jobs don’t 77 constant supervision “ 78 problem-solving skills that they can bring to other parts of their life”.The research also found that those who have 79 challenging and interesting jobs provide better home environments for their children. The mothers give their offspring more intellectual stimulation and emotional support, and this, 80 turn, is linked to fewer behavior problem.with C.B.in D.onof61.A.D.tendedrelatedC.62.likely B.A.linkedD.thesamewrong63.A.true B.false C.64. A. negative B. positive C. affirmative D. denialC.associate D.juniorvice B.deputy65.A.gatherD.C.gatheringassembledA.66.assembly B.listenD.heargive C.followB.67.A.68. A. growing B. bringing C. feeding D. raising69. A. mental B. psychological C. physical D. bodyD.depth70.C.extentA.frequency B.degreeanother D.othersC.A.other71.one B.C.thosewhosewho D.B.whom72.A.73. A. instead B. rather than C. rather D. instead ofget C.makehave D.take B.74.A.Thus D.WhatSo C.Such B.A.75.76. A. even B. even then C. even when D. even so77. A. involve B. relate C. revolve D. relate78. A. invent B. develop C. developing D. inventingleast79.most D.C.A.less B.moreby D.withto C.in B.A.80.Part Ⅴ Translation (15 points)Directions:Read the following passage carefully and translate the underlined sentences into Chinese. Write your translation on ANSWER SHEET 2.81. By now it’s hardly news that as education has risen to the top of the national agenda, a great wave of school reform has focused on two related objectives: more-stringent academic standards and increasingly rigorous accountability for both student and schools.82. In state after state, legislatures, governors, and state boards, supported by business leaders, have imposed tougher requirements in math, English, science, and other fields, together with new tests by which the performance of both students and schools is to be judged. In some places students have already been denied diplomas or held back in grade if they failed these tests. 83. In some states funding for individual schools and for teachers’ and principals’ salaries----and in some, such as Virginia, the accreditation of schools---will depend on how well students do on tests. More than half the states now require tests for student promotion or graduation.But a backlash has begun.84. In Virginia this spring parents, teachers, and school administrators opposed to the state’s Standard of Learning assessments, established in 1998, inspired a flurry of bills in the legislature that called for revising the test of their status as unavoidable hurdles for promotion and graduation. One bill would also have required that each new member of the sate board of education “take the eighth grade Standard of Learning assessments in English, mathematics, science, and social sciences” and that “the results of such assessments… be publicly reported.” 85. None of the bills passed, but there’s little doubt that if the system isn’t revised and the state’s high failure rates don’t decrease by 2004, when the first Virginia senior may be denied diplomas, the political pressure will intensify. Meanwhile, some parents are talking about Massachusetts-style boycotts.Part Ⅵ Writing(15 points)Directions:Write a composition of no less than 200 words about you opinions on academic plagiarism—the dishonest act in academic communication. Write your answer on ANSWER SHEET 2.。

北京航空航天大学考博英语真题2013年(总分80, 做题时间90分钟)Part Ⅰ Listening Comprehension略Part Ⅱ Reading ComprehensionDirections:There are four passages in this part Each passage is followed by some questions or unfinished statements. For each of them, there are 4 choices marked A, B, C and D. Read the passages carefully and decide on the best choice. Then mark the corresponding letter on the ANSWER SHEET with a single line through the center. Passage 1Printmaking is the generic term for a number of processes, of which woodcut and engraving are two prime examples. Prints are made by pressing a sheet of paper (or other material) against an image-bearing surface to which ink has been applied. When the paper is removed, the image adheres to it, but in reverse.The woodcut had been used in China from the fifth century A.D. for applying patterns to textiles. The process was not introduced into Europe until the fourteenth century, first for textile decoration and then for printing on paper. Woodcuts are created by a relief process; first, the artist takes a block of wood, which has been sawedparallel to the grain, covers it with a white ground, and then draws the image in ink. The background is carved away, leaving the design area slightly raised. The woodblock is inked, and the ink adheres to the raised image. It is then transferred to damp paper either by hand or with a printing press.Engraving, which grew out of the goldsmith"s art, originated in Germany and northern Italy in the middle of the fifteenth century. It is an intaglio process (from Italian intagliare, "to carve"). The image is incised into a highly polished metal plate, usually copper, with a cutting instrument, or burin. The artist inks the plate and wipes it clean so that some ink remains in the incised grooves. An impression is made on damp paper in a printing press, with sufficient pressure-being applied so that the paper picks up the ink.Both woodcut and engraving have distinctive characteristics. Engraving lends itself to subtle modeling and shading through the use of fine lines. Hatching and cross-hatching determine the degree of light and shade in a print. Woodcuts tend to be more linear, with sharper contrasts between light and dark. Printmaking is well suited to the production of multiple images. A set of multiples is called an edition. Both methods can yield several hundred good-quality prints before the original block or plate begins to show signs of wear. Massproduction of prints in the sixteenth century made images available, at a lower cost, to a much broader public than before.SSS_SINGLE_SEL1.What does the passage mainly discuss?A The origins of textile decorationB The characteristics of good-quality printsC Two types\of printmakingD Types of paper used in printmaking该题您未回答:х该问题分值: 1.5答案:C[解析] 本题为主旨题。