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.
答案是A。可我的疑惑在C选项,我觉得更直接。因为文中说蚊帐能减少疟疾的感染,一般会认为潜在的逻辑是能阻挡蚊子的叮咬,可是原文并没这么说,所以我觉得我们只能由原文得出这样两条逻辑链——1. 蚊子的叮咬会传染疟疾; 2. 蚊帐能减少疟疾的感染率。然后,原文问为什么官员不愿意推荐用蚊帐。我觉得最直接的理由应该是C,因为蚊帐不能阻止蚊子(虽然听上去很没道理,可是原文确实并没有给我们这个逻辑链)。
而A虽然也可以解释官员为什么不推荐用蚊帐,可毕竟是谈及了原文未谈论到的范围——疟疾能引发身体产生免疫。我觉得这个解释也有点荒唐,万一小孩因为得疟疾而死亡呢?
所以,总的来说,我认为C更直接。请大家指教。 |