Q40:
Until mow, only injectable vaccines against influenza have been available.  arents 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?
- Any person who has received the injectable vaccine can safely receive the nasal-spray vaccine as well.
- The new vaccine uses the same mechanism to ward off influenza as jnjectable vaccines do.
- The injectable vaccine is affordable for all adults.
- Adults do not contract influenza primarily from children who have influenza.
- The nasal spray vaccine is mot effective when administered to adults.
我还是觉得选E. 文中说这个喷药对小孩有效,也就是对大人无效.如果对大人有效,就应该推广,因为注射太疼. 既然这个喷药对大人无效,大人还得注射疫苗, 小孩用这个药意义不大,因为小孩不会因为流感得并发症,所以没必要推广
D才是无关。大人接种疫苗就不会被传染,不接种就会被传染。 |