单选

Insomnia can be traced to many different reasons, but what is_____(23)to many sufferers is their inability to relax fully and "switch the mind_____(24)".

  • A.on
  • B.off
  • C.up
  • D.down
参考答案
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Once this has been_____(30)by the brain

  • A.remembered
  • B.pulled
  • C.changed
  • D.printed

moving from one_____(26)to the next

  • A.image
  • B.dream
  • C.concept
  • D.thought
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