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______.

  • A.But where can you find it?
  • B.This makes them feel tired.
  • C.In the summer they fly back to have babies.
  • D.We are learning more and more about them.
  • E.Biological clocks can be adjusted.
  • F.Other rhythms are based on months, seasons or years.
试题出自试卷《自考英语二(00015)2014年4月真题试卷及答案》
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