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monica

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

The explanaiton 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 travrel to Canada for certain kinds of surgery
(D) General practitioners in the United States do not as a rule examinea who is a canadidate fo rsurgery before sending the patient to a surgeon.
(E) There are no unnecessary surgical operations performed in Canada.

anyone can tell me why the answers is A ?

Thanks.

monica

I got it.
Thanks.

范进

明白了。另外，我认为换成33%，也是成立的。

Kilroy

在这里40%是个迷惑数字？如果换成33%也成立吗？
另外，我平常很难把have a greater need for...理解成主动要求

zyh79

结论：是因为外科医生多33%，所以人均动手术也多了40%。
假设：美国病人和加国病人相比，不会额外要求做手术。换句话说，人均动手术多不是自己主动要求的，而确实客观的有这么多手术要做，也确实对应这么多医生。

范进

是不是问题出在：undergo 和 greater need 这两个词的理解上？
俺不会解释。