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

One survey showed that people who habitually ______ each night have a higher risk of dying.

【参考答案】

C
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单项选择题
Do scientists know how many cryptic species exist
A．Not yet.
B．Yes, they do.
C．They will know the answer in another one or two years.
D．They will never know the answer.
填空题
A
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