请教一道题多谢

绿水清心 · 发表于 2010-7-27 16:19:11

Although the ratio of phusicians to total population is about the same in the United States and Canada, the United States has 33% more surgeons per capita. Clearly, this is the reason people in the United States undergo 40% more operations per capita than do Canadians.

The explanation given above rests on an assumption that

A. patients in the US do not have a greater need for surgery than do patients in Canada.

B. the population of US is not larger than that of Canada.

C. US patients sometimes travel to Canada for certain kinds of surgery.

D. general practitioners in US do not as a rule examine a patient who is a candidate for surgery before sending the patient to a surgeon.

E. there are no unnecessary surgical operations performed in Canada.

答案是A, 哪位指点一下，为什么呀？？？？？

spz316 · 发表于 2010-7-27 17:49:46

这是一个B-A结构题，就是先叙述了一个结果，然后解释原因。
对于题干只告诉我们了一句话：是多出的33%的人均医生数，导致了多出了40%的手术。
问假设。
假设的做法就是将选项取非，构成削弱即为假设。
一般思路就是他因削弱，找到一个其他原因来解释多出的40%的手术数量
A给出了他因，将A取非后得到美国人的对手术的需求更多。也就是说，是需求多——手术多
驳斥原文：医生数多——手术多，他因驳斥
希望LZ明白

绿水清心 · 发表于 2010-7-27 18:10:35

啊哈明白啦多谢楼上指点

请教一道题多谢

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请教一道题多谢