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托福阅读词汇题:derive

2015-08-25 18:06:38来源:网络

  【托福阅读题型:derive词汇题】托福阅读中词汇题是重要题型之一。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词汇题

  托福阅读词汇题:derive

  【Paragraph 4】Given that predators can make it costly to beg for food, what benefit do begging nestlings derive from their communications? One possibility is that a noisy baby bird provides accurate signals of its real hunger and good health,  making it worthwhile for the listening parent to give it food in a nest where several other offspring are usually available to be fed. If this hypothesis is true, then it follows that nestlings should adjust the intensity of their signals in relation to the signals produced by their nestmates, who are competing for parental attention. When experimentally deprived baby robins are  placed in a nest with normally fed siblings, the hungry nestlings beg more loudly than usual—but so do their better-fed  siblings, though not as loudly as the hungrier birds.(Begging by Nestlings)

  The word “derive” in the passage is closest in meaning to

  ○ require

  ○ gain

  ○ use

  ○ produce

  答案见下一页:

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