单选题:How can people shift pigeons' biological clocks?

  • 题目分类:高中英语
  • 题目类型:单选题
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题目内容:
How can people shift pigeons' biological clocks? A.By training them when they are young.
B.By minor and harmless operations.
C.By taking them really far away from home.
D.By keeping them in artificial days.

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答案解析:

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