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Questions 138-139 are based on the following. Roland: The alarming fact is that 90 percent of the people in this country now report that they know someone who is unemployed. Sharon: But a normal, moderate level of unemployment is 5 percent, with 1 out of 20 workers unemployed. So at any given time if a person knows approximately 50 workers, 1 or more will very likely be unemployed. Sharon's argument relies on the assumption that (A) normal levels of unemployment are rarely exceeded (B) unemployment is not normally concentrated in geographically isolated segments of the population (C) the number of people who each know someone who is unemployed is always higher than 90% of the population (D) Roland is not consciously distorting the statistics he presents (E) knowledge that a personal acquaintance is unemployed generates more fear of losing one's job than does knowledge of unemployment statistics B is the best answer. Sharon’s argument assumes that people are generally similar in how likely they are to have among their acquaintances people who are unemployed. Since heavy concentrations of unemployment in geographically isolated segments of the population would produce great differences in this respect, Sharon’s argument assumes few, if any, such concentrations. Choice B is therefore the best answer. 1If normal levels of unemployment were exceeded relatively frequently, and if Roland’s figure of 90 percent were an exaggeration, Sharon’s argument would be unaffected, so choices A and D are incorrect. 2At exceptionally low levels of unemployment, Sharon’s argument suggests that choice C is likely to be false, so C is not assumed. 3The fear of losing one’s job is not part of Sharon’s argument, so choice E is incorrect. 我明白C项错了，但不明百ets关于C项的解释？ | 
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发表于 2003-7-24 22:42:00
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