求助一道逻辑题，OG661

herb.yuan

Which of the following most logically completes the argument given?
Asthma, a chronic breathing disorder, is signi cantly more common today among adult competitive swimmers than it is among competitive athletes who specialize in other sports. Although chlorine is now known to be a lung irritant and swimming pool water is generally chlorinated, it would be rash to assume that frequent exposure to chlorine is the explanation of the high incidence of asthma among these swimmers, since __________.
(A) young people who have asthma are no more likely to become competitive athletes than are young people who do not have asthma
(B) competitive athletes who specialize in sports other than swimming are rarely exposed to chlorine
(C) competitive athletes as a group have a signi cantly lower incidence of asthma than do people who do not participate in competitive athletics
(D) until a few years ago, physicians routinely recommended competitive swimming to children with asthma, in the belief that this form of exercise could alleviate asthma symptoms
(E) many people have asthma without knowing they have it and thus are not diagnosed with the condition until they begin engaging in very strenuous activities, such as competitive athletics

D是正确答案，但是E为什么不行呀？

Andy是头小毛驴

E？

Wang.

competitive athletics不仅包含swimming还包含了other sports，E对两个比较主体的影响是一致的，所以不能说明Why asthma is more common among adult competitive swimmers than it is among competitive athletes who specialize in other sports.D直接质疑了结论的正确性，所以对。

herb.yuan

Wang. 发表于 2017-10-22 22:26
competitive athletics不仅包含swimming还包含了other sports，E对两个比较主体的影响是一致的，所以不能 ...

好滴，多谢