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Among the question of design, construction, and operation remaining to be solved before co

mmercial airliners travel faster than sound is the difficult problem of sonic boom (声震) , the explosive sound generated when an object moves through the air at supersonic speed(超音速).

A sound is a pressure disturbance: a sonic boom, like other explosive sounds, is the result of an abrupt change in pressure. An airplane in subsonic flight produces weak changed in pressure, but because these disturbances travel at the speed of sound, they move faster than the airplane and stay in front of it. In effect, these disturbances warn the air to get out of the way, and the an does just jet, however, gets ahead of its own pressure disturbances. Consequently a wave of suddenly com pressed air--a shock wave--builds up and is thrown off like the wave ;hat spreads from the bow of a speedboat.

Can sonic booms be eliminated? The answer is a categorical negative--they are an innerent(内在的) part of supersonic flight--but the sonic boom probably can be reduced; government and private research is now under way to improve understanding of the sonic boom. If and when the booms can be reduced to tolerable levels, commercial supersonic transports can come rata service.

Before commercial airliners travel faster than sound, problems must 0e solved regarding ______.

A.design

B.Construction

C.operation

D.all of the above

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更多“Among the question of design, …”相关的问题
第1题
Questions 26 to 30 are based on the following passage. The question of whether war is inev
itable is one which has concerned many of the world’s great writers. Before considering this question, it will useful to introduce some related concepts. Conflict, defined as opposition among social entities directed against one another is distinguished from competition, defined as opposition among social entities independently striving for some thing which is in inadequate supply. Competitors may not be aware of one another, while the parties to a conflict are. Conflict and vice of one another.

Opposition is thus contrasted with cooperation, the process by which social entities function in the service of one another. These definitions are necessary because it is important to emphasize that competition between individuals or groups is inevitable in a world of limited resources, but conflict is not. Conflict, nevertheless, is very likely to occur, and is probably an essential and desirable element of human societies.

Many authors have argued for the inevitability of war from the premise that in the struggle for existence among animal species, only the fittest survive. In general, however this struggle in nature’s competition, not conflict. Social animals, such as monkeys and cattle, fight to win or maintain leadership of the group. The struggle for existence occurs not in such fights but in the competition for limited feeding areas and for the occupancy of areas free from meet-eating animals. Those who fail in competition starve to death or become victims to other species. This struggle for existence does not resemble human war, but rather the competition of individuals for jobs, markets, and materials. The essence of the struggle is the competition for the necessities of life that are insufficient to satisfy all.

Among nations there is competition in developing resources trades, skills, and a satisfactory way of life. The successful nations grow and prosper; the unsuccessful decline. While it is true that this competition may induce efforts to expand territory at the expense of others, and thus lead to conflict, it cannot be said that war-like conflict among nations is inevitable, although competition is.

第26题:In the first paragraph, the author gives the definitions of some term in order to ________.

A) argue for the similarities between and human societies

B) smooth out the conflicts in human societies

C) distinguish between two kinds of opposition

D) summarize the that characteristic features of opposition and cooperation

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第2题
Can we discuss the question of commodity inspection?

A.O

B.The inspection of goods is particularly important.

C.We would prefer to re-inspect goods at the unloading port.

D.But there might be some dispute over the results of inspection.

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第3题
We all know that the normal human daily cycle of activity is of some 7-8 hours' sleep alte
rnating with some 16-17 hours' wakefulness and that, broadly s peaking, the sleep normally coincides with the hours of darkness. Our present concern is with how easily and to what extent this cycle can he modified.

The question is no mere academic one. The ease, for example, with which people can change from working in the day to winking at night is a question of growing importance in industry where automation calls for round-the-clock working of machines. It normally takes from five days to one week for a person to adapt to a reversed routine of sleep end wakefulness, sleeping during the day end working at night. Unfortunately, it is often the case in industry that shifts are changed every week; a person may work from 12 midnight to 8 a.m. one week, 8 a.m. to 4 p.m. the next, and 4 p. m. to 12 midnight the third and so on. This means that no sooner bas he got used to one routine than he has to change to another, so that much of his time is spent neither working nor sleeping very efficiently.

The only real solution appears to be to hand over the night shift to a number of permanent night workers. An interesting study of the domestic life and health of night-shift workers was carried out by Brown in 1957. She found a high incidence of disturbed sleep and other disorders among those on alternating day and night shifts, but no abnormal occurrence of these phenomena among those on permanent night work.

This latter system then appears to be the best long-term policy, but meanwhile something may be done to relieve the strains of alternate day and night work by selecting those people who can adapt most quickly to the changes of routine. One way of' knowing when a person has adapted is by measuring his body temperature. People engaged in normal daytime work will have a high temperature during the hours of wakefulness and a low one at night; when they change to night work the pattern will only gradually go back to match the new routine and the speed with which it does so parallels, broadly speaking, the adaptation of the body as a whole, particularly in terms of performance. There from, by taking body temperature at intervals of two hours throughout the period of wakefulness it can be seen how quickly a person can adapt to a reversed routine, and this could be used as a basis for selection. So far, however, such a form. of selection does not seem to have been applied in practice.

Why is the question of "how easily people can get used to working at night?" not a mere academic question?

A.Because few people like to reverse the cycle of sleep aud wakefulness.

B.Because sleep normally coincides with the hours of darkness.

C.Because people are required to work at night in some fields of industry.

D.Because shift work in industry requires people to change their sleeping habits.

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第4题
If it were only necessary to decide whether to teach elementary science to everyone on a m
ass basis or to find the gifted few and take them as far as they can go, our task would be fairly simple. The public school system, however, has no such choice, for the jobs must be carried on at the same time. Because we depend so heavily upon science and technology for our progress, we must produce specialists in many fields. Because we live in a democratic nation, whose citizens make the policies for the nation, large numbers of us must be educated to understand, to support, and when necessary, to judge the work of experts. The public school must educate both producers and users of scientific services.

In education, there should be a good balance among the branches of knowledge that contribute to effective thinking and wise judgment. Such balance is defeated by too much emphasis on any one field. This question of balance involves not only the relation of the natural sciences, the social sciences, and the arts but also relative emphases among the natural sciences themselves.

Similarly, we must have a balance between current and classical knowledge. The attention of the public is continually drawn to new possibilities in scientific fields and the discovery of new knowledge; these should not be allowed to mm our attention away from the sound, established materials that form. the basis of courses for beginners.

According to the first paragraph, the task of education is fairly complicated because ______.

A.the current public school system is too complicated to be understood

B.the public school system has no choice of what to teach

C.it is difficult to decide whether elementary science should be taught in public schools

D.the educators have to take care of both ordinary and gifted students

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第5题
IV. Reading Comprehension (60 points) Directions: There are five reading passages in

IV. Reading Comprehension (60 points)

Directions: There are five reading passages in this part. Each passage is followed by four questions. For each question there are four suggested answers marked A, B, C and D. Choose one best answer and blacken the corresponding letter on the Answer Sheet.

Passage One

Wild and farm birds often get a flu virus. Yet they usually are able to carry the virus without getting sick.

In 1997 six people in Hong Kong died of a different kind of bird flu virus. It is called the h-five-n-one virus. The Hong Kong government quickly ordered the killing of all farm birds there. That stopped the spread of h-five-n-one to people in Hong Kong.

Yet the virus bad already spread to other parts of Asia. It was found in 16 countries between 2003 and 2006.

The h-five-n-one virus first appeared in Africa. This raised many concerns about the spread of the disease. Scientists do not know exactly how bird flu came to Africa. At first, they thought wild birds were to blame. Now, officials with the U. N. Food and Agriculture Organization believe the main cause is trade in farm birds.

The bird flu virus is found in the waste and liquids of infected birds. The virus spreads when healthy birds or people touch sick birds or nay infected (被感染了的) part of sick birds. Right now, the virus is not spreading among person to person. But the virus could change and start spreading among people. Health officials believe that it is even more possible now that bird flu has spread in Africa, and that is why international organizations are working so hard to stop its spread.

The best way to stop the spread of bird flu is to kill all the chickens in an area where bird flu has been discovered. More than 145 000 chickens have been killed in Nigeria since bird fin was first found one year ago.

36. The passage focuses on ______.

A. wild and farm birds

B. a fin virus

C. bird flu

D. infected birds

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第6题
Imagine being asked to spend twelve or so years of your life in a society which consisted
only of members of your own sex. How would you (1)_____? Unless there was (2)_____ definitely wrong with you, you wouldn't be too happy about it, to (3)_____ the least. It is all the (4)_____ surprising therefore that so many parents in the world choose to impose such (5)_____ conditions (6)_____ their children—conditions which they themselves wouldn't put up with for one minute!

Any discussion of this topic is (7)_____ to question the aims of education. Stuffing children's heads full of knowledge is (8)_____ being foremost among them. One of the chief aims of education is to (9)_____ future citizens with all they require to (10)_____ their place in adult society. Now adult society is made up of men and women, so how can a segregated school (11)_____ offer the right kind of preparation for it? Anyone entering adult society after years of segregation can only be in for a (12)_____.

A co-educational school offers children nothing (13)_____ a true (14)_____ of society in miniature. Boys and girls are given the (15)_____ to get to know each other, to learn to live together from their earliest years. They are put in a position where they can compare them selves with each other (16)_____ academic ability, athletic achievement and many of the extracurricular activities which are (17)_____ of school life. What a (18)_____ advantage it is (to give just an example) to be able to put on a school play in which the male parts will be taken by boys and the female parts by girls! What (19)_____ co-education makes of the argument that boys are cleverer than girls or vice-versa. When segregated, boys and girls are made to feel that they are a race apart. (20)_____ between the sexes is fostered. In a co-educational school, everything falls into its proper place.

A.recruit

B.react

C.reckon

D.retain

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第7题
Traditionally, the study of history has had fixed boundaries and focal points—periods, cou
ntries, dramatic events, and great leaders. It also has had clear and firm notions of scholar procedure: how one inquires into a historical problem, how one presents and documents one's findings, what constitutes admissible and adequate proof.

Anyone who has followed recent historical literature can testify to the revolution that is taking place in historical studies. The currently fashionable subjects come directly from the sociology catalog: childhood, work, leisure. The new subjects are accompanied by new methods. Where history once was primarily narrative, it is now entirely analytic. The old questions "What happened?" and "How did it happen?" have given way to the question "Why did it happen? Prominent among the methods used to answer the question "Why" is psychoanalysis, and its use has given rise to psychohistory.

Psychohistory does not merely use psychological explanations in historical contexts. Historians have always used such explanations when they were appropriate and when there was sufficient evidence for them. But this pragmatic use of psychology is not what psychohistorians intend. They are committed, not just to psychology in general, but to Freudian psychoanalysis. This commitment precludes a commitment to history as historians have always understood it. Psychohistory derives its "facts" not from history, the detailed records of events and their consequences, but from psychoanalysis of the individuals who made history, and deduces its theories not from this or that instance in their lives, but from a view of human nature that transcends history. It denies the basic criterion of historical evidence: that evidence be publicly accessible to, and therefore assessable by, all historians. And it violates the basic tenet of historical method: that historians be alert to the negative instances that would refute their theses. Psychohistorians, convinced of the absolute rightness of their own theories, are also convinced that theirs is the "deepest" explanation of any event that other explanations fall short of the truth.

Psychohistory is not content to violate the discipline of history (in the sense of the proper mode of studying and writing about the past); it also violates the past itself. It denies to the past an integrity and will of its own, in which people acted out of a variety of motives and in which events had a multiplicity of causes and effects. It imposes upon the present, thus robbing people and events of their individuality and of their complexity. Instead of respecting the particularity of the past, it assimilates all events, past and present, into single deterministic schema that is presumed to be true at all times and in all circumstances.

Which of the following best states the main point of the passage?______

A.The approach of psychohistorians to historical study is currently in vogue even though it lacks the rigor and verifiability of traditional historical method

B.Traditional historians can benefit from studying the techniques and findings ofpsychohistorians

C.Areas of sociological study such as childhood and work are of little interest to traditionalhistorians

D.History is composed of unique and nonrepeating events that must be individually analyzed on the basis of publicly verifiable evidence

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第8题
A. Hold the line B. flight number C. ask a questionD. To New York E. May I have your nameF

A. Hold the line B. flight number

C. ask a question D. To New York

E. May I have your name F. reconfirm my seat

G. please check in______ H. On May II______

Reservations clerk: Northwind Airlines. Can I help you?

Daniel Adams: Hello. I'd like to【56】, please.

Reservations clerk: May I have your name and【57】, please?

Daniel Adams: My name is Daniel Adams and my flight number is 374.

Reservations clerk: When are you leaving?

Daniel Adams:【58】.

Reservations clerk: And your destination?

Daniel Adams: Buenos Aires.

Reservations clerk:【59】, please. (...) All right. Your seat is confirmed, Mr. Adams. You'll be arriving in Buenos Aires at 4 o' clock p. m. local time.

Daniel Adams: Thank you. Can I pick up my ticket when I check in? Reservations clerk: Yes, but【60】at least one hour before departure time.

(57)

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第9题
Whether to teach young children a second language is disputed among teachers, researchers
and pushy parents. On the one hand, acquiring a new tongue is said to be far easier when young. On the other, teachers complain that children whose parents speak a language at home that is different from the one used in the classroom sometimes struggle in their lessons and are slower to reach linguistic milestones. Would a 15-month-old child, they wonder, not be better off going to music classes?

A study just published in the Proceedings of the National Academy of Sciences may help resolve this question by getting to the point of what is going on in a bilingual child’s brain, how a second language affects the way he thinks, and thus in what circumstances being bilingual may be helpful. Agnes Kovacs and Jacques Mehler at the International School for Advanced Studies in Trieste say that some aspects of the cognitive development of infants raised in a bilingual household must be undergoing acceleration in order to manage which of the two languages they are dealing with.

The aspect of cognition in question is part of what is termed the brain’s “executive function”. This allows people to organise, plan, prioritise activity, shift their attention from one thing to another and suppress habitual responses. Bilingualism is common in Trieste which, though Italian, is almost surrounded by Slovenia. So Dr. Kovacs and Dr. Mehler looked at 40 “preverbal” seven-month-olds, half raised in monolingual and half in bilingual households, and compared their performances in a task that needs control of executive function.

First, the babies were trained to expect the appearance of a puppet on a screen after they had heard a set of meaningless words invented by the researchers. Then the words, and the location of the puppet, were changed. When this was done, the babies who speak only one language had difficulty overcoming their learnt response, even when the researchers gave them further clues that a switch had taken place. The bilingual babies, however, found it far easier to switch their attention — counteracting the previously learnt, but no longer useful response.

Monitoring languages and .keeping them separate is part of the brain’s executive function, so these findings suggest that even before a child can speak, a bilingual environment may speed up that function’s development. Before rushing your offspring into bilingual kindergartens, though, there are a few cautions. For one thing, these extraordinary cognitive benefits have been demonstrated so far only in “crib” bilinguals — those living in households where two languages are spoken routinely. The researchers speculate that it might be the fact of having to learn two languages in the same setting that requires greater use of executive function. So whether those benefits apply to children who learn one language at home, and one at school, remains unclear.

Who are probably pushing young children to study a new language?

A.Parents.

B.Teachers.

C.Researchers.

D.Children themselves.

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第10题
?Read the article below about corporate culture on the opposite page. ?For each question 1

?Read the article below about corporate culture on the opposite page.

?For each question 13-18, mark one letter (A, B, C or D) on your Answer Sheet for the answer you choose.

The term corporate culture refers to an organization's value system. Managerial philosophies, workplace practices, and organizational network are included in the concept of corporate culture. Tyson Food's corporate culture is reflected in the fact that everyone—even CEO Don Tyson wears clothes of a yellowish brown color on the job.

The leaders who developed the company and the corporate culture typically shape the corporate culture.One generation of employees passes on a corporate culture to newer employees. Sometimes this is part of formal training. New managers who attend McDonald's Hamburger University may learn skills in management,but they also pick up the basics of the organization's corporate culture. Employees can absorb corporate culture through informal contacts as well, by talking with other workers and through their experiences on the job.

Corporate culture has a major impact on the success of an organization. In organizations with strong cultures,everyone knows and supports the organizations' objectives. In those with weak cultures, no clear sense of purpose exists. In fact, the authors of the classic book In Search of Excellence concluded the presence of a strong corporate culture was the single common thread among many diverse but highly successful companies such as General Electric and McDonald's.

As you can imagine, changing a company's corporate culture can be very difficult. But some managers try to do just that when they feel the current culture is weak, or when the organization's objectives change and the old culture no longer fits. Sometimes the competitive situation of a company changes.For instance, electric utilities, which once had their profits guaranteed by public regulation, now face more competition than ever. Firms that were comfortable competing against other American companies now find themselves fighting competitors from overseas, too.

Management expert Peter Duckers feels that, rather than trying to change culture, managers should focus on changing employees and corporate practices, as follows.

?Define what results are needed. Specify in measurable terms what the organization or department,or office) needs to achieve.

?Determine where these results are already being achieved within the current organization. Analyze the departments that are already effective and find out what they are doing differently from the rest.

?Determine what top management can do to encourage these good results. Duckers suggests that executives openly ask what they can do to help, and then do it.

?Change the reward system—or develop a new one—to recognize these effective practices. When employees realize that the organization really does reward the new approach, they will adopt it much more quickly. Whether one wants to change an organization culture or not, it is important to choose managers and employees whose personal styles fit the organization's goals.

According to the passage, corporate culture

A.means the cultural atmosphere in a company.

B.is established by top leaders and can't be changed.

C.involves the core values of a company.

D.has little influence on the performance of a company.

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