填空题

  • A. fall asleep again.
  • B. become more energetic the following day
  • C. sleep less than 7 hours
  • D. confirm those serious consequences
  • E. suffer sleep problems
  • F. sleep more than 8 hours

To get a good night’s rest, people may not need to ______.

【参考答案】

F
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As discovered by expedition scientists, Antarctica has not always been so cold as it is today, so has the Arctic.
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