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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 injectable 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 not effective when administered to adults.
答案是D。
题目不难理解，但我就一个问题，它原文里已经说了adults都是普遍接种过疫苗了，那D选项哪怕小孩能把这个病传染给大人，那也不会有事情啊。取非之后原文结果还是成立的啊。
我做的时候看下来觉得没一个答案是对的，反而还觉得B选项比D好一点。
望NN赐教！！
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发表于 2017-9-8 04:41:20
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发表于 2017-9-8 16:27:14
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