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SAT阅读模拟题之epidemics

2013-01-17 00:00:00来源:互联网

  (15) example is Lyme disease, which is caused by bacteria

  that are transmitted by deer ticks. It occurred only spo-

  radically during the late nineteenth century but has

  recently become prevalent in parts of the United States,

  largely due to an increase in the deer population that

  (20) occurred simultaneously with the growth of the suburbs

  and increased outdoor recreational activities in the

  deer’s habitat. Similarly, an outbreak of dengue hemor-

  rhagic fever became an epidemic in Asia in the 1950’s

  because of ecological changes that caused Aedes aegypti,

  (25)the mosquito that transmits the dengue virus, to proliferate

  The stage is now set in the United States for a

  dengue epidemic because of the inadvertent introduction

  and wide dissemination of another mosquito, Aedes

  albopictus.

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