OG2018-661

阿尔的阳光

Which of the following most logically completes the argument given?

Asthma, a chronic breathing disorder, is significantly 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 significantly 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
  
  
  
  
  楼主的疑问在d和e选项上，
  按照d的解题思路，表示既然physicians推荐游泳去缓解 asthma symptoms，即表示frequent exposure to chlorine和asthma没有因果关系，同理
  e选项，因为很多人的asthma病是成为运动前就有的，而在之后才发现，这不是就表示和游泳这项运动本身没有关系么？
  
  
  大侠们快来啊！！
  
  
  
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FYYHHLL

从原文逻辑链来看，有用运动员患者重病是因为游泳时水里的氯，要推翻这个结论必须和水利的氯有关。D 儿童患病的还被推荐去游泳，说明氯并不是这个病的原因。E,和逻辑链无关，属于过度联想。而且这个选项没有按照原文去探讨得病的原因。

阿尔的阳光

谢谢回复，
仔细品味一下，好像有一点区别了，
医生推荐代表游泳池没有危害，做运动员前有病，不足以证明游泳池没有危害

愤怒的小河马

E没有说明为什么练游泳的比练其他运动员得哮喘的比例更高。
D是相关因果中的 因果倒置