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SAT阅读模拟题之epidemics

2013-01-17 00:00:00来源:互联网

  下面为大家整理的是一篇关于epidemics 的SAT阅读模拟题,后面附有相关题目和正确答案。SAT阅读考试中的文章阅读在题目的设置上非常有特点,大家一起来看看详细内容吧,看看有哪些题目是特别的。

  Although genetic mutations in bacteria and viruses

  can lead to epidemics, some epidemics are caused by

  bacteria and viruses that have undergone no significant

  genetic change. In analyzing the latter, scientists have

  (5) discovered the importance of social and ecological fac-

  tors to epidemics. 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

  (10) which time polio infection produced paralysis. Previ-

  ously, 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. Another

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