A major cause of the increase in the greenhouse gases is

试卷相关题目

• 1Without the greenhouse gases, the earth would

  A.become warmer.

  B.be much colder.

  C.move more slowly.

  D.move quickly.

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• 2According 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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• 3The writer's attitude towards laughter is

  A.critical.

  B.doubtful.

  C.positive.

  D.negativ

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• 4In 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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• 5Which of the following statements is NOT true of laughter, according to the passage、

  A.It reduces pain,

  B.It exercises the body.

  C.it improves the body's immune system.

  D.It can cure cancer.

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• 6According to the passage, chlorofluorocarbon gases differ from carbon dioxide in that

  A.they are more useful.

  B.they are much heavier.

  C.they are more efficient in making the' world colder.

  D.they are more effective in catching the heat from the sun.

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• 7A 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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