2017年華中科技大學(xué)學(xué)博士英語(yǔ)真題(共12頁(yè))

1、精選優(yōu)質(zhì)文檔-傾情為你奉上 Passage 4 (4/63)The fossil remains of the first flying vertebrates, the pterosaurs, have intrigued paleontologists for more than two centuries. How such large creatures, which weighed in some cases as much as a piloted hang-glider and had wingspans from 8 to 12 meters, solved the probl

2、ems of powered flight, and exactly what these creatures werereptiles or birdsare among the questions scientists have puzzled over.Perhaps the least controversial assertion about the pterosaurs is that they were reptiles. Their skulls, pelvises, and hind feet are reptilian. The anatomy of their wings

3、 suggests that they did not evolve into the class of birds. In pterosaurs a greatly elongated fourth finger of each forelimb supported a wing-like membrane. The other fingers were short and reptilian, with sharp claws. In birds the second finger is the principal strut of the wing, which consists pri

4、marily of feathers. If the pterosaurs walked on all fours, the three short fingers may have been employed for grasping. When a pterosaur walked or remained stationary, the fourth finger, and with it the wing, could only turn upward in an extended inverted V-shape along each side of the animals body.

5、The pterosaurs resembled both birds and bats in their overall structure and proportions. This is not surprising because the design of any flying vertebrate is subject to aerodynamic constraints. Both the pterosaurs and the birds have hollow bones, a feature that represents a savings in weight. In th

6、e birds, however, these bones are reinforced more massively by internal struts.Although scales typically cover reptiles, the pterosaurs probably had hairy coats. T. H. Huxley reasoned that flying vertebrates must have been warm-blooded because flying implies a high rate of metabolism, which in turn

7、implies a high internal temperature. Huxley speculated that a coat of hair would insulate against loss of body heat and might streamline the body to reduce drag in flight. The recent discovery of a pterosaur specimen covered in long, dense, and relatively thick hairlike fossil material was the first

8、 clear evidence that his reasoning was correct.Efforts to explain how the pterosaurs became airborne have led to suggestions that they launched themselves by jumping from cliffs, by dropping from trees, or even by rising into light winds from the crests of waves. Each hypothesis has its difficulties

9、. The first wrongly assumes that the pterosaurs hind feet resembled a bats and could serve as hooks by which the animal could hang in preparation for flight. The second hypothesis seems unlikely because large pterosaurs could not have landed in trees without damaging their wings. The third calls for

10、 high waves to channel updrafts. The wind that made such waves however, might have been too strong for the pterosaurs to control their flight once airborne.It can be inferred from the passage that scientists now generally agree that the(A) enormous wingspan of the pterosaurs enabled them to fly grea

11、t distances(B) structure of the skeleton of the pterosaurs suggests a close evolutionary relationship to bats(C) fossil remains of the pterosaurs reveal how they solved the problem of powered flight(D) pterosaurs were reptiles(E) pterosaurs walked on all fours2.The author views the idea that the pte

12、rosaurs became airborne by rising into light winds created by waves as(A) revolutionary(B) unlikely(C) unassailable(D) probable(E) outdated3.According to the passage, the skeleton of a pterosaur can be distinguished from that of a bird by the(A) size of its wingspan(B) presence of hollow spaces in i

13、ts bones(C) anatomic origin of its wing strut(D) presence of hooklike projections on its hind feet(E) location of the shoulder joint joining the wing to its body4.The ideas attributed to T. H. Huxley in the passage suggest that he would most likely agree with which of the following statements?(A) An

14、 animals brain size has little bearing on its ability to master complex behaviors.(B) An animals appearance is often influenced by environmental requirements and physical capabilities.(C) Animals within a given family group are unlikely to change their appearance dramatically over a period of time.(

15、D) The origin of flight in vertebrates was an accidental development rather than the outcome of specialization or adaptation.(E) The pterosaurs should be classified as birds, not reptiles.Which of the following best describes the organization of the last paragraph of the passage?(A) New evidence is

16、introduced to support a traditional point of view.(B) Three explanations for a phenomenon are presented, and each is disputed by means of specific information.(C) Three hypotheses are outlined, and evidence supporting each is given.(D) Recent discoveries are described, and their implications for fut

17、ure study are projected.LSAT第27套 SECTION IMost office workers assume that the messages they send to each other via electronic mail are as private as a telephone call or a face-to-face meeting. That assumption is wrong. Although it is illegal in many areas for an employer to eavesdrop on private conv

18、ersations or telephone callseven if they take place on a company-owned telephonethere are no clear rules governing electronic mail. In fact, the question of how private electronic mail transmissions should be has emerged as one of the more complicated legal issues of the electronic age.Peoples opini

19、ons about the degree of privacy that electronic mail should have vary depending on whose electronic mail system is being used and who is reading the messages. Does a government office, for example, have the right to destroy electronic messages created in the course of running the government, thereby

20、 denying public access to such documents? Some hold that government offices should issue guidelines that allow their staff to delete such electronic records, and defend this practice by claiming that the messages thus deleted already exist in paper versions whose destruction is forbidden. Opponents

21、of such practices argue that the paper versions often omit such information as who received the messages and when they received them, information commonly carried on electronic mail systems. Government officials, opponents maintain, are civil servants; the public should thus have the right to review

22、 any documents created during the conducting of government business.Questions about electronic mail privacy have also arisen in the private sector. Recently, two employees of an automotive company were discovered to have been communicating disparaging information about their supervisor via electroni

23、c mail. The supervisor, who had been monitoring the communication, threatened to fire the employees. When the employees filed a grievance complaining that their privacy had been violated, they were let go. Later, their court case for unlawful termination was dismissed; the companys lawyers successfu

24、lly argued that because the company owned the computer system, its supervisors had the right to read anything created on it.In some areas, laws prohibit outside interception of electronic mail by a third party without proper authorization such as a search warrant. However, these laws do not cover “i

25、nside” interception such as occurred at the automotive company. In the past, courts have ruled that interoffice communications may be considered private only if employees have a “reasonable expectation” of privacy when they send the messages. The fact is that no absolute guarantee of privacy exists

26、in any computer system. The only solution may be for users to scramble their own messages with encryption codes; unfortunately, such complex codes are likely to undermine the principal virtue of electronic mail: its convenience.1.Which one of the following statements most accurately summarizes the m

27、ain point of the passage?(A) Until the legal questions surrounding the privacy of electronic mail in both the public and private sectors have been resolved, office workers will need to scramble their electronic mail messages with encryption codes.(B) The legal questions surrounding the privacy of el

28、ectronic mail in the work place can best be resolved by treating such communications as if they were as private as telephone conversations or face-to-face meetings.(C) Any attempt to resolve the legal questions surrounding the privacy of electronic mail in the workplace must take into account the es

29、sential difference between public-sector and private sector business.(D) At present, in both the public and private sectors, there seem to be no clear general answers to the legal questions surrounding the privacy of electronic mail in the workplace.(E) The legal questions surrounding the privacy of

30、 electronic mail in the workplace of electronic mail in the workplace can best be resolved by allowing supervisors in public-sector but not private-sector offices to monitor their employees communications.2.According to the passage, which one of the following best expresses the reason some people us

31、e to oppose the deletion of electronic mail records at government offices?(A) Such deletion reveals the extent of governments unhealthy obsession with secrecy.(B) Such deletion runs counter to the notion of governments accountability to its constituency.(C) Such deletion clearly violates the legal r

32、equirement that government offices keep duplicate copies of all their transactions.(D) Such deletion violates the governments own guidelines against destruction of electronic records.(E) Such deletion harms relations between government employees and their supervisors.3.Which one of the following mos

33、t accurately states the organization of the passage?(A) A problem is introduced, followed by specific examples illustrating the problem: a possible solution is suggested, followed by an acknowledgment of its shortcomings.(B) A problem is introduced, followed by explications of two possible solutions

34、 to the problem: the first solution is preferred to the second, and reasons are given for why it is the better alternative.(C) A problem is introduced, followed by analysis of the historical circumstances that helped bring the problem about a possible solution is offered and rejected as being only a

35、 partial remedy.(D) A problem is introduced, followed by enumeration of various questions that need to be answered before a solution can be found: one possible solution is proposed and argued for.(E) A problem is introduced, followed by descriptions of two contrasting approaches to thinking about th

36、e problem: the second approach is preferred to the first, and reasons are given for why it is more likely to yield a successful solution.4.Based on the passage, the authors attitude towards interception of electronic mail can most accurately be described as:(A) outright disapproval of the practice(B

37、) support for employers who engage in it(C) support for employees who lose their jobs because of it(D) intellectual interest in its legal issues(E) cynicism about the motives behind the practice5.It can be inferred from the passage that the author would most likely hold which one of the following op

38、inions about an encryption system that could encodes and decode electronic mail messages with a single keystroke?(A) It would be an unreasonable burden on a companys ability to monitor electronic mail created by its employees.(B) It would significantly reduce the difficulty of attempting to safeguar

39、d the privacy of electronic mail.(C) It would create substantial legal complications for companies trying to prevent employees from revealing trade secrets to competitors.(D) It would guarantee only a minimal level of employee privacy, and so would not be worth the cost involved in installing such a

40、 system.(E) It would require a change in the legal definition of “reasonable expectation of privacy” as it applies to employer-employee relations.SECTION BSome recent historians have argued that life in the British colonies in America from approximately 1763 to 1789 was marked by internal conflicts

41、among colonists. Inheritors of some of the viewpoints of early twentieth-century Progressive historians such as Beard and Becker, these recent historians have put forward arguments that deserve evaluation.The kind of conflict most emphasized by these historians is class conflict. Yet with the Revolu

42、tionary War dominating these years, how does one distinguish class conflict within that larger conflict? Certainly not by the side a person supported. Although many of these historians have accepted the earlier assumption that Loyalists represented an upper class, new evidence indicates that Loyalis

43、ts, like rebels, were drawn from all socioeconomic classes. (It is nonetheless probably true that a larger percentage of the well-to-do joined the Loyalists than joined the rebels.) Looking at the rebel side, we find little evidence for the contention that lower-class rebels were in conflict with up

44、per-class rebels. Indeed, the war effort against Britain tended to suppress class conflicts. Where it did not, the disputing rebels of one or another class usually became Loyalists. Loyalism thus operated as a safety valve to remove socioeconomic discontent that existed among the rebels. Disputes oc

45、curred, of course, among those who remained on the rebel side, but the extraordinary social mobility of eighteenth-century American society (with the obvious exception of slaves) usually prevented such disputes from hardening along class lines. Social structure was in fact so fluidthough recent stat

46、istics suggest a narrowing of economic opportunity as the latter half of the century progressedthat to talk about social classes at all requires the use of loose economic categories such as rich, poor, and middle class, or eighteenth-century designations like “the better sort.” Despite these vague c

47、ategories, one should not claim unequivocally that hostility between recognizable classes cannot be legitimately observed. Outside of New York, however, there were very few instances of openly expressed class antagonism.Having said this, however, one must add that there is much evidence to support t

48、he further claim of recent historians that sectional conflicts were common between 1763 and 1789. The “Paxton Boys” incident and the Regulator movement are representative examples of the widespread, and justified, discontent of western settlers against colonial or state governments dominated by east

49、ern interests. Although undertones of class conflict existed beneath such hostility, the opposition was primarily geographical. Sectional conflictwhich also existed between North and Southdeserves further investigation.In summary, historians must be careful about the kind of conflict they emphasize

50、in eighteenth-century America. Yet those who stress the achievement of a general consensus among the colonists cannot fully understand that consensus without understanding the conflicts that had to be overcome or repressed in order to reach it.17.The author considers the contentions made by the rece

51、nt historians discussed in the passage to be(A) potentially verifiable(B) partially justified(C) logically contradictory(D) ingenious but flawed(E) capricious and unsupported19.According to the passage, Loyalism during the American Revolutionary War served the function of(A) eliminating the disputes

52、 that existed among those colonists who supported the rebel cause(B) drawing upper, as opposed to lower, socioeconomic classes away from the rebel cause(C) tolerating the kinds of socioeconomic discontent that were not allowed to exist on the rebel side(D) channeling conflict that existed within a s

53、ocioeconomic class into the war effort against the rebel cause（E）(E) absorbing members of socioeconomic groups on the rebel side who felt themselves in contention with members of other socioeconomic groupsThe passage suggests that the author would be likely to agree with which of the following state

54、ments about the social structure of eighteenth-century American society?I.It allowed greater economic opportunity than it did social mobility.II.It permitted greater economic opportunity prior to 1750 than after 1750.III.It did not contain rigidly defined socioeconomic divisions.IV.It prevented econ

55、omic disputes from arising among members of the society.(A) I and IV only(B) II and III only(C) III and IV only(D) I, II, and III only(E) I, II, III, and IV21.It can be inferred from the passage that the author would be most likely to agree with which of the following statements regarding socioecono

56、mic class and support for the rebel and Loyalist causes during the American Revolutionary War?(A) Identifying a persons socioeconomic class is the least accurate method of ascertaining which side that person supported.(B) Identifying a person as a member of the rebel or of the Loyalist side does not

57、 necessarily reveal that persons particular socioeconomic class.(C) Both the rebel and the Loyalist sides contained members of all socioeconomic classes, although there were fewer disputes among socioeconomic classes on the Loyalist side.(D) Both the rebel and the Loyalist sides contained members of

58、 all socioeconomic classes, although the Loyalist side was made up primarily of members of the upper classes.According to the passage, which of the following is a true statement about sectional conflicts in America between 1763 and 1789?(A) These conflicts were instigated by eastern interests agains

59、t western settlers.(B) These conflicts were the most serious kind of conflict in America.(C) The conflicts eventually led to openly expressed class antagonism.(D) These conflicts contained an element of class hostility.(E) These conflicts were motivated by class conflicts.The recent, apparently successful, prediction by