大学英语大学英语大学英语六级(CET6)大学英语六级模拟题17

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• 51After the children put up Christmas decorations, the classroom ______a holiday appearance.

  A.took up

  B.took on

  C.took off

  D.took down

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• 52A scientific hypothesis can only be ______ by indisputable facts ,i.e. , by evidence derived from actual observation and experiment.

  A.claimed

  B.exposed

  C.continued

  D.confirmed

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