"The world... is also thirsty for water." This means that ______. We may face a severe worldwide water shortage in the future

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问题 "The world...  is also thirsty for water." This means that ______.
We may face a severe worldwide water shortage in the future because ______.

选项 A、some of it has been polluted
B、the small amount of fresh water is constantly being replaced by rainfall
C、our need for fresh water is increasing rapidly

答案C

解析 第二段的第三行提示了答案应该选c。
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