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题目材料:

In the context of the passage as a whole, the reference to the effect of colder temperatures serves primarily to
  • Aemphasize the importance of considering birdsong in the context of an entire ecosystem
  • Bcall into question the hypothesis that birdsong activity is contingent primarily on social interactions
  • Csuggest that birdsong activity may vary with seasonal changes
  • Dprovide support for the contention that levels of birdsong activity are related to feeding opportunities
  • Epoint out that temperature tends to play a role in levels of animal

D显示答案

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