Roland:
The alarming fact is that 90 percent of the people in this country now report that they know someone who is unemployed.
LACE w:st="on">SharonLACE>:
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.
LACE w:st="on">SharonLACE>'s argument relies on the assumption that
(B) unemployment is not normally concentrated in geographically isolated segments of the population
Sharon’s argument assumes that people are generally similar in how likely they are to have among their acquaintances people who are unemployed.
以上ＯＧ解释的这句话不是很理解，请那位牛牛帮我翻译一下，谢谢！
Since heavy concentrations of unemployment in geographically isolated segments of the population would produce great differences in this respect, LACE w:st="on">SharonLACE>’s argument assumes few, if any, such concentrations. Choice B is therefore the best answer.
这段解释是对Ｂ取非，但它怎么反对Sharon的论点呢？完全看不懂，请大牛帮忙！
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