We learn from the third paragraph that________.

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• 1The word "specters" in the second paragraph is closest in meaning to________.

  A.pollution.

  B.carbon dioxide

  C.aerosols

  D.ghosts

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• 2The author's main purpose in writing the article is to warn of________.

  A.warm weather

  B.hot weather

  C.a new ice age

  D.a new iceberg

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• 3The computer performed better than people in the study because________.

  A.the computer worked harder

  B.the computer was not busy

  C.people tended to be biased

  D.people were not good at statistics

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• 4During the experiment, the subjects were asked________.

  A.to control the sensors and the camera

  B.to rate the degrees to which they could be interrupted

  C.to compare their behaviors with others'

  D.to analyze all the indicators of interruption

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• 5Scientists at Carnegie Menon University tried to find out________.

  A.why office doors were often left open

  B.when it was a good time to turn off the computer

  C.what questions office workers were bothered with

  D.which behaviors could tell whether a person was busy

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• 6What will happen if the dust aerosol layer develops、

  A.The Earth will get extremely hot.

  B.The balance between the amount of heat absorbed from the Sun and the amount　lost could hardly be maintained.

  C.The light of the Sun could no longer reach the surface of the Earth.

  D.C.The light of the Sun could no longer reach the surface of the Earth.D.Infrared radiation could no longer be transmitted from the Earth to outer spac

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• 7The only way to stop the spread of aerosols in the atmosphere, according to Dr. Rasool and Dr. Schneider, is to use________.

  A.fossil fuels

  B.electric power

  C.nuclear energy

  D.coal power

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