OG-119

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今天检讨了这篇,提供一点想法

1.由题目的写法可知,此题是在考"推论".推论题的特点是,标准答案=原文句子改写.

2.回文章中找寻和modern sanitation有关的句子,发现有二:
  a. modern sanitation was able to delay exposure to polio until adolescece or adulthood,
  b. Thus, the hygiene that helped prevent typhoid epidemics indirectly foster a paralytic polio epidemic.

3.抉择:选B句为考量的对象,Thus, the hygiene that helped prevent typhoid epidemics indirectly foster a paralytic polio epidemic.

hygiene helped prevent typhoid epidemics → a lack of sanitation →  An epidemic of typhoid.

4. D不对，infants无论如何不会病发paralytic polio. (Previously, infection had occurred during infancy, when it typically provided lifelong immunity without paralysis.)