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What causes the central problem that so much water is wasted mainly by farmers？A．Because f

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What causes the central problem that so much water is wasted mainly by farmers？

A．Because farmers can use water for agriculture free.

B．Because agriculture uses 75% of the world"s water.

C．Because most farmers are not aware of water shortage.

D．Because too many thirsty crops are grown in dry countries.

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  • 正确答案：A
    事实细节题。根据题干关键词centralproblems和mainlybyfarmers定位到原文第四段。由第三句Becausewaterisusuallyfree．．．可知，因为水一般免费，所以造成了农民用水浪费，因此选[A]项。[B]项和[D]项都是农业大量用水的表象，并非其原因。[C]项不正确。