91年2月gre考試閱讀真題解析(B)

來源：育路教育網(wǎng)發(fā)布時(shí)間：2011-08-11

　　- 6、 血漿膠體滲透壓的大小主要取決于

　　A.清蛋白濃度

　　B.球蛋白濃度

　　C.葡萄糖濃度

　　D.脂類的含量

　　E.Na+，Cl-等無機(jī)離子含量

　　標(biāo)準(zhǔn)答案： a

　　7、 治療貧血的關(guān)鍵是促進(jìn)血紅素的合成，下面的物質(zhì)中影響血紅素合成的物質(zhì)是

　　A.鐵離子

　　B.鈣離子

　　C.氨基酸

　　D.葡萄糖

　　E.鉛

　　標(biāo)準(zhǔn)答案： e

　　8、 血漿中的非蛋白氮的檢測可以用于輔助診斷，下列物質(zhì)中不屬于非蛋白氮的是

　　A.尿素

　　B.肌酐

　　C.肌酸

　　D.尿酸

　　E.尿卟啉原

　　標(biāo)準(zhǔn)答案： e

　　9、 將血漿蛋白置于pH值為8.6的緩沖液中進(jìn)行醋酸纖維薄膜電泳，泳動(dòng)最快的是

　　A.γ-球蛋白

　　B.清蛋白

　　C.α1-球蛋白

　　D.α2-球蛋白

　　E.p-球蛋白

　　標(biāo)準(zhǔn)答案： b

　　10、 血漿蛋白質(zhì)中不包括：

　　A.清蛋白

　　B.球蛋白

　　C.膽紅素

　　D.纖維蛋白原

　　E.某些功能酶

　　標(biāo)準(zhǔn)答案： c

e 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 upper-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 occurred， 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 fluid—though recent statistics suggest a narrowing of economic opportunity as the latter half of the century progressed—that 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 categories， 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 the 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 eastern interests. Although undertones of class conflict existed beneath such hostility， the opposition was primarily geographical. Sectional conflict—which also existed between North and South—deserves further investigation.

    In summary， historians must be careful about the kind of conflict they emphasize 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 recent historians discussed in the passage to be

    （A） potentially verifiable

    （B） partially justified

    （C） logically contradictory

    （D） ingenious but flawed

    （E） capricious and unsupported

    18. The author most likely refers to “historians such as Beard and Becker” （lines 5-6） in order to

    （A） isolate the two historians whose work is most representative of the viewpoints of Progressive historians

    （B） emphasize the need to find connections between recent historical writing and the work of earlier historians

    （C） make a case for the importance of the views of the Progressive historians concerning eighteenth-century American life

    （D） suggest that Progressive historians were the first to discover the particular internal conflicts in eighteenth-century American life mentioned in the passage

    （E） point out historians whose views of history anticipated some of the views of the recent historians mentioned in the passage

    19. According to the passage， Loyalism during the American Revolutionary War served the function of

    （A） eliminating the disputes 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 socioeconomic class into the war effort against the rebel cause

    （E） absorbing members of socioeconomic groups on the rebel side who felt themselves in contention with members of other socioeconomic groups

    20. The passage suggests that the author would be likely to agree with which of the following statements 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 economic 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 IV

    21. It can be inferred from the passage that the author would be most likely to agree with which of the following statements regarding socioeconomic class and support for the rebel and Loyalist causes during the American Revolutionary War？

    （A） Identifying a person‘s 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 necessarily reveal that person‘s 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 all socioeconomic classes， although the Loyalist side was made up primarily of members of the upper classes.

    （E） Both the rebel and the Loyalist sides contained members of all socioeconomic classes， although many upper-class rebels eventually joined the Loyalists.

    22. The author suggests which of the following about the representativeness of colonial or state governments in America from 1763 to 1789？

    （A） The governments inadequately represented the interests of people in western regions.

    （B） The governments more often represented class interests than sectional interests.

    （C） The governments were less representative than they had been before 1763.

    （D） The governments were dominated by the interests of people of an upper socioeconomic class.

    （E） The governments of the northern colonies were less representative than were the governments of the southern colonies.

    23. 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 against 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.

    Since 1953， many experimental attempts to synthesize the chemical constituents of life under “primitive Earth conditions” have been performed， but none of these experiments has produced anything approaching the complexity of the simplest organism. They have demonstrated， however， that a variety of （a variety of： adj.多種的） the complex molecules currently making up living organisms could have been present in the early ocean and atmosphere， with only one limitation： such molecules are synthesized far less readily when oxygen-containing compounds dominate the atmosphere. Therefore some scientists postulate （to assume or claim as true， existent， or necessary： depend upon or start from the postulate of） that the Earth‘s earliest atmosphere， unlike that of today， was dominated by hydrogen， methane， and ammonia.

    From these studies， scientists have concluded that the surface of the primitive Earth was covered with oceans containing the molecules fundamental to life. Although， at present， scientists cannot explain how these relatively small molecules combined to produce larger， more complex molecules， some scientists have precipitously ventured hypotheses that attempt to explain the development， from lager molecules， of the earliest self-duplicating organisms.

    24. According to the passage， which of the following can be inferred about the process by which the chemical constituents of life were synthesized under primitive Earth conditions？

    （A） The synthesis is unlikely to occur under current atmospheric conditions.

    （B） The synthesis is common in modern laboratories.

    （C） The synthesis occurs more readily in the atmosphere than in the ocean.

    （D） The synthesis easily produces the most complex organic molecules.

    （E） The synthesis is accelerated by the presence of oxygen-containing compounds.

    25. The primary purpose of the passage is to

    （A） point out that theories about how life developed on Earth have changed little since 1953

    （B） warn of increasing levels of hydrogen， methane， and ammonia in the Earth‘s atmosphere

    （C） describe the development since 1953 of some scientists‘ understanding of how life began on Earth

    （D） demonstrate that the synthesis of life in the laboratory is too difficult for modern technology

    （E） describe how primitive atmospheric conditions produced the complex molecules of living organisms

    26. It can be inferred from the passage that “some scientists” assume which of the following concerning “larger， more complex molecules” （line 20）？

    （A） The earliest atmosphere was formed primarily of these molecules.

    （B） Chemical processes involving these molecules proceeded much more slowly under primitive Earth conditions.

    （C） The presence of these molecules would necessarily precede the existence of simple organisms.

    （D） Experimental techniques will never be sufficiently sophisticated to produce in the laboratory simple organisms from these chemical constituents.

    （E） Explanations could easily be developed to explain how simple molecules combined to form these more complex ones.

    27. The author‘s reaction to the attempts that have been made to explain the development of the first self-duplication organisms can best be described as one of

    （A） enthusiasm

    （B） expectation

    （C） dismay

    （D） skepticism

    （E） antipathy

    答案：17-27：BEEBBADACCD

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