The sun is the heaviest star in the universe.

试卷相关题目

• 1The attraction of two large stars leads to gravity.

  A.Right

  B.Wrong

  C.Not mentioned

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• 2The center of a black hole is empty.

  A.Right

  B.Wrong

  C.Not mentioned

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• 3Black holes exist but are difficult to observe.

  A.Right

  B.Wrong

  C.Not mentioned

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• 4Black holes are part of space.

  A.Right

  B.Wrong

  C.Not mentioned

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• 5Her sister __urged__ her to apply for the job.

  A.advised

  B.caused

  C.forced

  D.promised

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• 6The nearest black holes are hundreds of light years away from us.

  A.Right

  B.Wrong

  C.Not mentioned

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• 7The Hubble Space Telescope helps scientists to understand the nature of the universe.

  A.Right

  B.Wrong

  C.Not mentioned

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• 8According 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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• 9China’s Three Gorges Dam

  A.is the first hydroelectric dam in the world.

  B.is of the same size as the US’s Hoover Dam.

  C.can generate around 3% of world electricity.

  D.is the largest hydroelectric dam in the world.

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• 10Which country took the lead in making use of tidal currents to produce power in 2003、

  A.The UK.

  B.China.

  C.Norway.

  D.The US.

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