GMAT申友逻辑CR题库-Until now, only injectable vaccines against influenza have been available. Parents are reluctant to subject children to the pain-GWD

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Until now, only injectable vaccines against influenza have been available.

Parents are reluctant to subject children to the pain of injections, but adults, who are at risk of serious complications from influenza, are commonly vaccinated. A new influenza vaccine, administered painlessly in a nasal spray, is effective for children. However, since children seldom develop serious complications from influenza, no significant public health benefit would result from widespread vaccination of children using the nasal spray.

Which of the following is an assumption on which the argument depends?

A. Any person who has received the injectable vaccine can safely receive the nasal-spray vaccine as well.

B. The new vaccine uses the same mechanism to ward off influenza as jnjectable vaccines do.

C. The injectable vaccine is affordable for all adults.

D. Adults do not contract influenza primarily from children who have influenza.

E. The nasal spray vaccine is most effective when administered to adults.

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答案：

思路：家

长不给孩子打疫苗的理由里，忽略了另一点。如果得了感冒的孩子，把感冒传染给大人，就会给大人带来麻烦。孩子得感冒不是问题，因为不会有并发症，大人则刚好相反，会因为被传染了感冒而引发并发症。所以，带孩子去打疫苗，就变成了是出于大人利益的考虑，而非出于孩子自身的需要。以此为出发点，大人就会积极地带孩子用nasal spray的方式去打疫苗。这样一来，公共健康机构就能够通过nasal spray给孩子打疫苗赚到很多钱。那么，原文的结论就被削弱。
选项D恰好是排除了这个理由的可能性（大人不会从患有流感的孩子那里染上流感），从而支持了结论。