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题目材料：
Some people deplore the fact that many of the world's major rivers, such as the Yellow River, the Colorado, and the Nile, now run dry before reaching the sea. The primary reason these rivers run dry is that their water is diverted for irrigation of food crops. The world's increasing population requires an increasing food supply. Thus, as a response to this need, at least, the draining of the major rivers is beneficial.
The argument depends on the assumption that
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A.climate change is responsible for the decrease in water in many of the world's major rivers
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B.river water is the single largest source of water for crop irrigation worldwide
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C.none of the water from the rivers is reused after being initially used for irrigation of crops
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D.using the water of the rivers for personal hygiene is less important than using it to increase food supplies
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E.failure of the water to reach the sea does not decrease the production of fisheries at the outlets of the rivers enough to outweigh the increased crop yields
E显示答案
