小女子请教一道题

小尧0126

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

The explanation given above rests on an assumption that

(A)patients in the United States do not have a greater need for surgery than do patients in Canada.

(B)the population of the United States is not larger than that of Canada.

(C)United States patients sometimes travel to Canada for certain kinds of surgery.

(D)general practitioners in the United States 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.

小尧0126

我觉得这五个中D比其他的合适，但也不是最合适的。我也不知道答案是什么，所以请教高手指点。

爱维的天

可不可以请MM注明题目来源，下面贴子参考一下..
http://forum.chasedream.com/dispbbs.asp?boardID=24&ID=74827&page=1

xonlen

A, 取非可为一个原因---导致手术量上升。

小尧0126

这个也不是什么题库的题啦，就是我DOWN的一篇讲逻辑的文章里的例题。

小尧0126

我明白为什么选A了。谢了。