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题目材料:

The primary purpose of the passage is to
  • Acompare the different types of cost involved for certain birds in singing
  • Bquestion a hypothesis regarding the energy costs of singing for certain birds
  • Cpresent evidence suggesting that singing has an important energy cost for certain birds
  • Ddiscuss the benefits provided to an organism by a behavior that is costly in energy
  • Edescribe an experiment that supports an alternative model of how birdsong functions

C显示答案

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