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34．Scientists think that the continents always where they today.A．aren’t,are B．aren’t,were C．weren’t,are D．weren’t,were 【查看更多】

 

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Millions of youngsters across Europe could suffer ____ hearing loss after five years if they listen to MP3 players at too high a volume for more than five hours a week, EU scientists warned


  1. A.
    temporary
  2. B.
    permanent
  3. C.
    frequent
  4. D.
    extraordinary

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Scientists are convinced _____ the positive effect of laughter _____ physical and mental health．


  1. A.
    of; on
  2. B.
    by; in
  3. C.
    of; at
  4. D.
    on; at

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Scientists generally agree that the earth's climate will warm up over the next 50 to 100 years ________ it has warmed in the 20 000 years since Ice Age.


  1. A.
    so long as
  2. B.
    as much as
  3. C.
    as long as
  4. D.
    as well as

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Scientists photographed for the first time ever _____ wild gorillas used a stick to test the depth of a pool before getting into it, according to a recent study.


  1. A.
    which
  2. B.
    what
  3. C.
    that
  4. D.
    when

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Scientists say it may be five or six years ________ it is possible to test this medicine on human patients．


  1. A.
    since
  2. B.
    after
  3. C.
    before
  4. D.
    when

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