填空题

  • A．than more recent ones
  • B．the killing efficiency for older eruptions
  • C．has remained controversial
  • D．Wignall’s calculations as acceptable
  • E．has been known to us all
  • F．his ideas

The cause of the extinction of dinosaurs ______.

【参考答案】

C
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B
单项选择题
For our bodies to function properly, we should ______.
A．sleep for at least eight hours per night
B．believe that we need less sleep as we age
C．adjust our activities to the new inventions
D．be able to predict the rhythms of our biological clocks
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