求牛牛们帮忙解一题

merryrq0209

Poliomyelitis, for example, emerged
as an epidemic in the United States in the twentieth
century; by then, modern sanitation was able to delay
exposure to polio until adolescence or adulthood, at
which time polio infection produced paralysis. Previously,
infection had occurred during infancy, when it
typically provided lifelong immunity without paralysis.
Thus, the hygiene that helped prevent typhoid epidemics
indirectly fostered a paralytic polio epidemic.

先求这段话的翻译。。。请求牛牛们帮忙

再求一题解法：

119. The passage suggests that a lack of modern sanitation would make which of the following most likely to occur?

(A) An outbreak of Lyme disease

(B) An outbreak of dengue hemorrhagic fever

(C) An epidemic of typhoid

(D) An epidemic of paralytic polio among infants

(E) An epidemic of paralytic polio among adolescents and adults

我再怎么也不可能选到C，我很郁闷啊。要是不知道sanitation和hygiene的意思，这道题岂不是再怎么也不可能做出来？？？

我觉得应该选D或者E中的一个啊！！！

LR85

你想选D or E 是因为第一句吧。但它并没有说epidemic 是发生在infant or adult。所以只选D or E 答案不完整。

我的理解是重点在最后一句：

Thus, the hygiene that helped prevent %typhoid% epidemics
indirectly fostered a paralytic polio epidemic.

1. hygiene refers to modern sanitation
2. so a lack of modern sanitation would NOT prevent typhoid epidemics
3. therefore C which is the only possible answer that contains the word TYPHOID.

Hope this made sense.