FEIFEI-117

mildsevens

117. A certain viral infection is widespread among children, and about 30 percent of children infected with the virus develop middle ear infections. Antibiotics, although effective in treating bacterial infections, have no effect on the virus. Yet when middle ear infections in children infected with the virus are treated with antibiotics, the ear often clear up.

Which one of the following most helps to explain the success of the treatments with antibiotics?

(A) Although some types of antibiotics fail to clear up certain infections, other types of antibiotics might provide effective treatment for those infections.

(B) Children infected with the virus are particularly susceptible to bacterial that infect the middle age（怀疑原文错误，应该是ear）.

(C) Many children who develop middle ear infections are not infected with the virus.

(D) Most viral infections are more difficult to treat than are most bacterial infections.

(E) Among children not infected with the virus, fewer than 30 percent develop middle ear infections.

做的时候很勉强的选C，答案是B，不太明白，请指教！

[此贴子已经被作者于2005-7-3 8:46:55编辑过]

mygoalusa

原文是说ANTIBIOTICS一般能治疗细菌的感染，但对这个VIRUS的治疗并没有作用，但是，对治疗感染中耳炎的儿童却起到了作用，“没有作用”和“有作用”的区别明显在“儿童”身上。答案必是BCE中的一个。B讲的是儿童对引起中耳炎的这种细菌特别敏感，也就是说，能消除这种细菌的药物必然能在儿童身上起到明显左右，所以B对。