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托福阅读修辞目的题:the Great Lakes

2015-08-13 16:16:47来源:网络

  【托福阅读题型:the Great Lakes修辞目的题】托福阅读中句子插入题是重要题型之一。根据托福阅读题型不同来进行专项练习,是短期提高托福阅读能力的有效方法。同学们需要多加练习哦!

  查看全部:托福阅读题型分类练习之修辞目的题

  托福阅读修辞目的题:the Great Lakes

  【Paragraph 5】Residence times vary enormously. They range from a few days for small lakes up to several hundred years for large ones; Lake Tahoe, in California, has a residence time of 700 years. The residence times for the Great Lakes of North America, namely, Lakes Superior, Michigan, Huron, Erie, and Ontario, are, respectively, 190,100,22,2.5, and 6 years. Lake Erie’s is the lowest: although its area is larger than Lake Ontario’ s, its volume is less than one-third as great because it is so shallow-less than 20 meters on average.(Lake Water)

  Why does the author discuss the Great Lakes in paragraph 5?

  ○To demonstrate the extent to which residence times vary from lake to lake

  ○To illustrate how residence times are calculated for specific lakes

  ○To argue that the residence time of a lake increases with area

  ○To emphasize that Lake Tahoe' s residence time is unusually long

  答案见下一页:

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