What is the real cause of the potential water crisis? In order to raise the efficiency of the water supply, measures should be

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问题 What is the real cause of the potential water crisis?
In order to raise the efficiency of the water supply, measures should be taken to______.

选项 A、guarantee full protection of the environment
B、centralize the management of water resources
C、increase the sense of responsibility of agencies at all levels
D、encourage local and regional of water resources

答案B

解析 依据为最后一段。
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