The attraction of two large stars leads to gravity.

试卷相关题目

• 1The center of a black hole is empty.

  A.Right

  B.Wrong

  C.Not mentioned

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• 2Black holes exist but are difficult to observe.

  A.Right

  B.Wrong

  C.Not mentioned

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• 3Black holes are part of space.

  A.Right

  B.Wrong

  C.Not mentioned

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• 4It is __virtually__ impossible to persuade him to apply for the job.

  A.simply

  B.almost

  C.totally

  D.completely

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• 5This 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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• 6The sun is the heaviest star in the universe.

  A.Right

  B.Wrong

  C.Not mentioned

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• 7The nearest black holes are hundreds of light years away from us.

  A.Right

  B.Wrong

  C.Not mentioned

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• 8The Hubble Space Telescope helps scientists to understand the nature of the universe.

  A.Right

  B.Wrong

  C.Not mentioned

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• 9To 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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• 10According to the second paragraph,most road accidents happen due to

  A.heavy traffic.

  B.human mistakes.

  C.B.human mistakes.C.engine failure.

  D.bad weather.

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