A mosquito bite can transmit to a person the parasite that causes malaria, and the use of mosquito nets over children’s beds can significantly reduce the incidence of malarial infection for children in areas where malaria is common. Yet public health officials are reluctant to recommend the use of mosquito nets over children’s beds in such areas.
Which of the following, if true, would provide the strongest grounds for the public health officials’ reluctance?
A. Early exposure to malaria increases the body’s resistance to it and results in a lesser likelihood of severe life-threatening episodes of malaria.
B. Mosquito bites can transmit to people diseases other than malaria.
C. Mosquito nets provide protection from some insect pests other than mosquitoes.
D. Although there are vaccines available for many childhood diseases, no vaccine has been developed that is effective against malaria.
E. The pesticides that are most effective against mosquitoes in regions where malaria is common have significant detrimental effects on human health.[A]
C不是正好排出了它因.说明蚊子防不了,那疟疾也防不了. 这不是加强原文吗?
结论说:不赞成用蚊子网。
问支持。那么正确答案肯定是讲为什么不赞成用蚊子网。
加强有以下几种可能:有其它方式可以避免感染疟疾;用蚊子网起不到避免感染疟疾的作用;补充其它信息等。
A的情况属于补充其它信息以证明不能用蚊子网。
C说这个网还能起到防止其它虫子叮咬的作用;这个应该说是没有说到点上……退一步讲,既然有更多的好处,那应该大力提倡啊,这样不是削弱结论了吗,结论说不能用。 |