Although the ratio of physicians ot total population is about the same in US and CANADA, the US has 33% more surgeons per capita. Clearly this is the reason people in US undergo 40% more operations per capti than do Canadians.
The explanation above rests on assumption that A) patients in US do not hae a greater need for surgery than do patients in CANADA
The answer is A), 但是原文是怎么推出的? 原文中的the US has 33% more surgeons per capita到底是原因还是结果?
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发表于 2003-9-22 14:37:00
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