The center of a black hole is empty.

试卷相关题目

• 1Black holes exist but are difficult to observe.

  A.Right

  B.Wrong

  C.Not mentioned

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• 2Black holes are part of space.

  A.Right

  B.Wrong

  C.Not mentioned

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• 3Her sister __urged__ her to apply for the job.

  A.advised

  B.caused

  C.forced

  D.promised

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• 4Their style of playing football is __utterly__ different.

  A.barely

  B.scarcely

  C.hardly

  D.totally

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• 5I won’t __tolerate__ that kind of behavior.

  A.bear

  B.receive

  C.admit

  D.take

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• 6The attraction of two large stars leads to gravity.

  A.Right

  B.Wrong

  C.Not mentioned

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• 7The sun is the heaviest star in the universe.

  A.Right

  B.Wrong

  C.Not mentioned

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• 8The nearest black holes are hundreds of light years away from us.

  A.Right

  B.Wrong

  C.Not mentioned

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• 9The Hubble Space Telescope helps scientists to understand the nature of the universe.

  A.Right

  B.Wrong

  C.Not mentioned

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• 10According to the passage,which of the following is the most polluting energy resource、

  A.Petroleum.

  B.Coal.

  C.Natural gas

  D.Water.

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