According to the passage, a greenhouse is built to

试卷相关题目

• 1The writer's attitude towards laughter is

  A.critical.

  B.doubtful.

  C.positive.

  D.negativ

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• 2In 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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• 3Which 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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• 4Doctors have found that laughter

  A.keeps down blood pressure.

  B.has similar effects to physical exercise.

  C.decreases the heart rate.

  D.increases stress.

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• 5We learn from the first paragraph that laughter

  A.is good for one's health.

  B.is related to some illness.

  C.has been investigated long since.

  D.has no effect on the body.

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• 6Without the greenhouse gases, the earth would

  A.become warmer.

  B.be much colder.

  C.move more slowly.

  D.move quickly.

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• 7A 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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• 8According 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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• 9A 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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