What does “clear-air turbulence” probably mean、 (Paragraph 1)

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• 1Which of the following statements is NOT true, according to the passage、

  A.One third of the world’s population drinks coffee.

  B.Coffee is native to Colombia.

  C.Coffee can keep one awake.

  D.Coffee drinks were first made by Arabs.

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• 2Which country is the largest coffee producer、

  A.Brazil.

  B.Colombia.

  C.Ethiopia.

  D.Egypt.

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• 3Thousands of Irish people starved during the “Potato Famine” because

  A.they were so dependent on potatoes that they refused to eat anything else.

  B.they were forced to leave their homeland and move to america.

  C.the weather conditions in ireland were not suitable for growing potatoes.

  D.the potato harvest was bad.

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• 4“Some” in the last sentence of the first paragraph refers to

  A.some cocoa trees.

  B.some chocolate drinks.

  C.some shops.

  D.some south american indians.

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• 5According to the passage, which of the following has changed the most in the last 500 years、

  A.Food

  B.Clothing

  C.Ideology.

  D.Languag

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• 6In December 1997, a United Airlines flight hit unexpected rough air,

  A.causing a lot of damage to the plane.

  B.throwing its passengers out of the cabin.

  C.resulting in heavy casualties.

  D.forcing the pilot to make an emergency landing.

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• 7The turbulence detector can tell the severity of the turbulence by measuring

  A.the speed of the plane.

  B.the speed of the light.

  C.the number of particles in the air.

  D.the changes of the particles’ speed.

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• 8We can infer from the fifth paragraph that

  A.the lidar detector can successfully forecast turbulence.

  B.researchers are not sure about the effectiveness of the lidar detector.

  C.passenger planes will be used in further experiments.

  D.no more test flights are needed.

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• 9The last paragraph tells us, among other things, that

  A.the lidar detector needs improvement.

  B.many airlines are interested in the system.

  C.passengers often forget to fasten their seatbelts.

  D.the lidar detector can be used in a wide range of areas.

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• 10Which of the following statements about Flowers and Yeo is true、

  A.They are students at Sussex University.

  B.They are rice breeders.

  C.They are husband and wife

  D.They are colleagues at an institution of higher learning.

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