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最近事儿多~~~不多说~~放题！！！
[精练]
1. According to the theory of continental drift, in
prehistoric times, many of today’s separate
continents were part of a single huge landmass. As
the plates on which this landmass rested began to
move, the mass broke apart, and ocean water filled
the newly created chasms. It is hypothesized, for
example, that South America was once joined on its
east coast with what is now the west coast of Africa.
Which one of the following discoveries, if it were
made, would most support the above hypothesis
about South America and Africa?
(A) A large band of ancient rock of a rare type
along the east coast of South America is of
the same type as a band on the west coast of
Africa.
(B) Many people today living in Brazil are
genetically quite similar to many western
Africans.
(C) The climates of western Africa and of the east
coast of South America resemble each other.
(D) Some of the oldest tribes of people living in
eastern South America speak languages
linguistically similar to various languages
spoken by certain western African peoples.
(E) Several species of plants found in western
Africa closely resemble plants growing in
South America.
【逻辑链】
21. (28114-!-item-!-188;#058&003832)
Film Director: It is true that certain characters and plot twists in my newly released film The Big Heist are strikingly similar to characters and plot twists in Thieves, a movie that came out last year. Based on these similarities, the film studio that produced Thieves is now accusing me of taking ideas from that film. The accusation is clearly without merit. All production work on The Big Heist was actually completed months before Thieves was released.
Which of the following, if true, provides the strongest support for the director's rejection of the accusation?
(A) Before Thieves began production, its script had been circulating for several years among various film studios, including the studio that produced The Big Heist.
(B) The characters and plot twists that are most similar in the two films have close parallels in many earlier films of the same genre.
(C) The film studio that produced Thieves seldom produces films in this genre.
(D) The director of Thieves worked with the director of The Big Heist on several earlier projects.
(E) The time it took to produce The Big Heist was considerably shorter than the time it took to produce Thieves.
22. (28162-!-item-!-188;#058&003858)
Herbicides allow cereal crops to be grown very efficiently, with virtually no competition from weeds. In Britain, partridge populations have been steadily decreasing since herbicide use became widespread. Some environmentalists claim that these birds, which live in and around cereal crop fields, are being poisoned by the herbicides. However, tests show no more than trace quantities of herbicides in partridges on herbicide-treated land. Therefore, something other than herbicide use must be responsible for the population decrease.
Which of the following, if true about Britain, most seriously weakens the argument?
(A) The elimination of certain weeds from cereal crop fields has reduced the population of the small insects that live on those weeds and that form a major part of partridge chicks' diet.
(B) Since partridges are valued as game birds, records of their population are more carefully kept than those for many other birds.
(C) Some of the weeds that are eliminated from cereal crop fields by herbicides are much smaller than the crop plants themselves and would have no negative effect on crop yield if they were allowed to grow.
(D) Birds other than partridges that live in or around cereal crop fields have also been suffering population declines.
(E) The toxins contained in herbicides typically used on cereal crops can be readily identified in the tissues of animals that have ingested them.
23. (28303-!-item-!-188;#058&003943)
A product that represents a clear technological advance over competing products can generally command a high price. Because technological advances tend to be quickly surpassed and companies want to make large profits while they still can, many companies charge the maximum possible price for such a product. But large profits on the new product will give competitors a strong incentive to quickly match the new product's capabilities. Consequently, the strategy to maximize overall profit from a new product is to charge less than the greatest possible price.
In the argument above, the two portions in boldface play which of the following roles?
(A) The first is a consideration that has been raised to argue that a certain strategy is counterproductive; the second presents that strategy.
(B) The first is a consideration raised to support the strategy that the argument recommends; the second presents that strategy.
(C) The first is a consideration raised to explain the appeal of a certain strategy; the second presents that strategy.
(D) The first is an assumption, rejected by the argument, that has been used to justify a course of action; the second presents that course of action.
(E) The first is a consideration that has been used to justify pursuing a goal that the argument rejects; the second presents a course of action that has been adopted in pursuit of that goal.
24. (28903-!-item-!-188;#058&004064)
Although exposure to asbestos is the primary cause of mesothelioma, a slow-developing cancer, researchers believe that infection by the SV40 virus is a contributing cause, since in the United States 60 percent of tissue samples from mesotheliomas, but none from healthy tissue, contain SV40. SV40 is a monkey virus; however, in 1960 some polio vaccine was contaminated with the virus. Researchers hypothesize that this vaccine was the source of the virus found in mesotheliomas decades later.
Which of the following, if true, most strongly supports the researchers' hypothesis?
(A) SV40 is widely used as a research tool in cancer laboratories.
(B) Changes in the technique of manufacturing the vaccine now prevent contamination with SV40.
(C) Recently discovered samples of the vaccine dating from 1960 still show traces of the virus.
(D) In a small percentage of cases of mesothelioma, there is no history of exposure to asbestos.
(E) In Finland, where the polio vaccine was never contaminated, samples from mesotheliomas do not contain SV40. |
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发表于 2011-12-13 09:37:20
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