Black holes exist but are difficult to observe.

试卷相关题目

• 1Black holes are part of space.

  A.Right

  B.Wrong

  C.Not mentioned

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• 2It is __virtually__ impossible to persuade him to apply for the job.

  A.simply

  B.almost

  C.totally

  D.completely

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• 3This is not __typical__ of English,but is a feature of the Chinese language.

  A.particular

  B.characteristic

  C.remarkable

  D.idiomatic

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• 4The weather is a constant __subject__ of conversation in Britain.

  A.question

  B.problem

  C.title

  D.topic

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• 5Relief workers were __shocked__ by what they saw.

  A.moved

  B.touched

  C.surprised

  D.worried

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• 6The center of a black hole is empty.

  A.Right

  B.Wrong

  C.Not mentioned

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• 7The attraction of two large stars leads to gravity.

  A.Right

  B.Wrong

  C.Not mentioned

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• 8The sun is the heaviest star in the universe.

  A.Right

  B.Wrong

  C.Not mentioned

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• 9The nearest black holes are hundreds of light years away from us.

  A.Right

  B.Wrong

  C.Not mentioned

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• 10The Hubble Space Telescope helps scientists to understand the nature of the universe.

  A.Right

  B.Wrong

  C.Not mentioned

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