Saudi Arabia’s attempts to grow wheat in desert areas have seen the pumping of huge quantities of irrigation（灌溉） water from underground reserves . Because there is no rainfall in these areas ,such reserves can only decrease, and it is believed that fifty years of pumping will see them run dry.

　　72. From the first two paragraphs we learn that

　　A. much of the world’s water is available for use

　　B. people in high rainfall countries feel lucky

　　C. the costs of water redistribution should be considered

　　D. water can be easily carried through pipes across the world

　　73. Which of the following is true?

　　A. The water stores in Texas have been reduced by 75%.

　　B. Most industries in the world suffer from water shortages.

　　C. The underground water in Saudi Arabia might run out in 20 years.

　　D. Good management of water use resulted from the project in the Central Valley.

　　74. What is most likely to be discussed in the paragraph that follows?

　　A. Steps to improving water use management.

　　B. Ways to reduce the costs of building dams.

　　C. Measures to deal with worldwide water shortages.

　　D. Approaches to handling the pressure on water supply.

　　75. The text is mainly about

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