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?
选哪个呢?理由。
应该是D,将D取非,Adults contract influenza primarily from children who have influenza
则原文结论no significant public health benefit would result from widespread vaccination of children using the nasal spray。不成立。
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