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题库 / Prep2007E1-CR-58
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, one or more will very likely be unemployed.
Sharon's argument relies on the assumption that
normal levels of unemployment are rarely exceeded
unemployment is not normally concentrated in geographically isolated segments of the population
the number of people who each know someone who is unemployed is always higher than 90 percent of the population
Roland is not consciously distorting the statistics he presents
knowledge that a personal acquaintance is unemployed generates more fear of losing one's job than does knowledge of unemployment statistics
A，unemploement rate很少超过5%，也就是说一般都低于5%，那很有可能无法退出sharon的结论。 weaken
B，negation，失业集中在某一地区的话，若该地区失业率超过5%，其他地区低于5%，无法推出普遍使用的结论，weaken，所以这个是assumption