gmat逻辑题Although the ratio of physicians to total population is about the same in the United States and Canada,the United States has 33 percent more surgeons per capita.Clearly,this the reason people in the United States undergo 40 percent more

Question

gmat逻辑题
Although the ratio of physicians to total population is about the same in the United States and Canada,the United States has 33 percent more surgeons per capita.Clearly,this the reason people in the United States undergo 40 percent more operations per capita than do Canadian.
The explanation given above rests on an assumption that
(a)patients in the United States do not have a greater need forr surgery than do patients in Canada.
(b)the population of the United States is not larger than that of Canada.
其它选项就不说了.

Answer 1

physicians-泛指一般医师,也指内科医生
surgeons -外科医师
operations=surgery手术
这是假设题.
A翻译：美国病人不比加拿大病人需要更多的外科手术.（这个是排除外因影响.外因是——因为美国人需要更多的外科手术——所以需要更多的外科医生.）
题目：条件1,美国和加拿大的内科医生比例相同,（话说回来,这里我觉得physician翻译成医师还是内科医师都没有影响）条件2,美国人均比加拿大要多33%的外科医生.现象：这一季,美国人经历比加拿大多40%的外科手术.（因为外科医生多,所以有更多的手术,想说明这个问题.）
B选项对我来说是无关选项,整个题目都在问比例,人口总的具体数量多少已经不重要了.（==当然做题的时候不能这样想就不看选项了.）翻译：美国的人口不比加拿大多.
(C)United States patients sometimes travel to Canada for certain kinds of surgery.
美国的病人有时候去加拿大做外科手术——这个时候,加拿大的外科手术比率比美国多的,这里推翻结论.
(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.
D是无关选项.是说实习医生的事情.
(E) there are no unnecessary surgical operations performed in Canada.
E加拿大不需要更多的外科手术,这是一个干扰项,如果加拿大不需要手术了话,那么美国人经历的外科手术应该会比加拿大多140%……
额,以上,我是这样想的,我不知道想法有没有错,你最好去看看别人的答案.