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

试卷相关题目

• 1The sun is the heaviest star in the universe.

  A.Right

  B.Wrong

  C.Not mentioned

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• 2The attraction of two large stars leads to gravity.

  A.Right

  B.Wrong

  C.Not mentioned

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• 3The center of a black hole is empty.

  A.Right

  B.Wrong

  C.Not mentioned

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• 4Black holes exist but are difficult to observe.

  A.Right

  B.Wrong

  C.Not mentioned

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• 5Black holes are part of space.

  A.Right

  B.Wrong

  C.Not mentioned

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• 6The Hubble Space Telescope helps scientists to understand the nature of the universe.

  A.Right

  B.Wrong

  C.Not mentioned

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• 7To 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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• 8According 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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• 9Which of the following safety developments is NOT mentioned in the passage、

  A.Windscreens that can help drivers to improve their vision.

  B.Radars that can help drivers to see obstacles in fog.

  C.Devices that can help drivers to see through big vehicles.

  D.Improvements in seat belts,pedal controls and tyres.

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• 10Satellite tracking and remote communication systems cna be used to

  A.reduce oil consumption.

  B.remove the obstacles on the road.

  C.call for help when one’s car crashes.

  D.help drivers get out of a traffic jam.

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