Which of the following best describes the author’s tone in this passage、

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• 1We can conclude from the passage that ________.

  A.while pushing asteroids off course nuclear weapons would destroy the world

  B.asteroids racing across the night sky are likely to hit Earth in the near future

  C.the worry about asteroids can be left to future generations since it is unlikely to happen in our lifetime

  D.workable solutions still have to be found to prevent a collision of asteroids with Earth

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• 2What do people think of the suggestion of using nuclear weapons to alter the courses of asteroids、

  A.It sounds practical but it may not solve the problem.

  B.It may create more problems than it might solve.

  C.It is a waste of money because a collision of asteroids with Earth is very unlikely.

  D.Further research should be done before it is proved applicabl

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• 3What do scientists say about the collision of an asteroid with Earth、

  A.It is very unlikely but the danger exists.

  B.Such a collision might occur once every 25 years.

  C.Collisions of smaller asteroids with Earth occur more often than expecte

  D.D.It’s still too early to say whether such a collision might occur.

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• 4What does the passage say about asteroids and meteoroids、

  A.They are heavenly bodies different in composition.

  B.They are heavenly bodies similar in nature.

  C.There are more asteroids than meteoroids.

  D.Asteroids are more mysterious than meteoroids.

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• 5                                    Passage ThreeQuestions 18 to 20 are based on the passage you have just heard.

  A.The threat of poisonous desert animals and plants.

  B.The exhaustion of energy resources.

  C.The destruction of oil wells.

  D.The spread of the black powder from the fires.

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• 6The passage mainly discusses ________.

  A.a new way of highway speed control

  B.a new pattern for painting highways

  C.a new approach to training drivers

  D.a new type of optical illusion

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• 7On roads painted with chevrons, drivers tend to feel that ________.

  A.they should avoid speed-related hazards

  B.they are driving in the wrong lane

  C.they should slow down their speed

  D.they are approaching the speed limit

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• 8The advantage of chevrons over straight, horizontal bars is that the former ________.

  A.can keep drivers awake

  B.can cut road accidents in half

  C.will have a longer effect on drivers

  D.will look more attractive

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• 9The American Automobile Association Foundation for Traffic Safety plans to ________.

  A.try out the Japanese method in certain areas

  B.change the road signs across the country

  C.replace straight, horizontal bars with chevrons

  D.repeat the Japanese road patterns

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• 10What does the author say about straight, horizontal bars painted across roads、

  A.They are falling out of use in the United States.

  B.They tend to be ignored by drivers in a short period of time.

  C.They are applicable only on broad roads.

  D.They cannot be applied successfully to traffic circles.

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