What is the real cause of the potential water crisis? The author says that in some hot and dry areas it is advisable to ______.

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问题 What is the real cause of the potential water crisis?
The author says that in some hot and dry areas it is advisable to ______.

选项 A、build big lakes to store water
B、construct big pumping stations
C、channel water from nearby rivers to cropland
D、build small and cheap irrigation systems

答案C

解析 依据为第四段第二行起相关内容。
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