Passage ThreeQuestions 17 to 20 are based on the following passage:

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• 1Passage TwoQuestions 14 to 16 are based on the following passage:

  A.To estimate the extreme weather.

  B.To develop the satellite technology. 

  C.To improve agricultural output. 

  D.To learn how to change information to maps more efficiently. 

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• 2Passage OneQuestions 11 to 13 are based on the following passage:

  A.Soil.

  B.Human population.

  C.Forest.

  D.Water. 

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• 3What is this passage mainly about、

  A.Demonstrating the serious weather condition around Lake Chad. 

  B.Introducing people's activity around Lake Chad.

  C.Analyzing of the factors that cause water decreases in Lake Cha

  D.D.Introducing scientists' work about water condition in Lake Chad.

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• 4What did people do to solve the problem of rain lack around Chad Lake、

  A.They moved out of this area.

  B.They drew water from Lake Chad.

  C.They carried water from other areas.

  D.They utilize seawater near this area.

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• 5Which of the following is true according to this passage、

  A.Chad Lake located in the middle of Chad in northern Africa.

  B.The water from Chad water can now only be used for irrigation.

  C.The area around Chad Lake has suffered from heavy rain lack many decades.

  D.Population around the Chad Lake now begins to decrease due to water lack.

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• 6Why computer data become imprecise in 1980s、 

  A.The related programs on the computer were out of date. 

  B.More and more people drew water directly from the lake for drink. 

  C.A heavy rain happened around 1980. 

  D.The irrigation from the source water increases.

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• 7What is scientists' attitude towards the future of Chad Lake、

  A.Pessimism.

  B.Hopeful. 

  C.Indifferent.

  D.Doubtful.

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