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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• 3It is __virtually__ impossible to persuade him to apply for the job.

  A.simply

  B.almost

  C.totally

  D.completely

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• 4This 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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• 5The weather is a constant __subject__ of conversation in Britain.

  A.question

  B.problem

  C.title

  D.topic

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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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• 10To reduce car crash rate,many scientists are working hard to

  A.design fully automatic cars.

  B.develop faster electric vehicles.

  C.analyze road deaths occurring worldwide each year.

  D.improve the safety of cars and develop new fuels.

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