According to the passage, chlorofluorocarbon gases differ from carbon dioxide in that

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• 1A major cause of the increase in the greenhouse gases is

  A.the burning of trees and crops.

  B.the building of many greenhouses.

  C.the burning of large quantities Of coal and oil.

  D.the flooding of large areas of the world.

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• 2Without the greenhouse gases, the earth would

  A.become warmer.

  B.be much colder.

  C.move more slowly.

  D.move quickly.

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• 3According to the passage, a greenhouse is built to

  A.keep the plants warm.

  B.prevent air pollution.

  C.stop the greenhouse effect.

  D.produce useful gases.

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• 4The writer's attitude towards laughter is

  A.critical.

  B.doubtful.

  C.positive.

  D.negativ

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• 5In a laughter clinic, doctors

  A.laugh at their patients.

  B.encourage their patients to laugh.

  C.smile when they don't feel like laughing.

  D.never stop laughing.

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• 6A small increase in the earth's temperature may bring about

  A.a decline in agriculture.

  B.a drop of the sea level.

  C.the death of all animals.

  D.a delay in the greenhouse effect.

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