What percentage does the fresh water account for? Only _________________________ percent.

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问题 What percentage does the fresh water account for?
Only _________________________ percent.
What percentage does the fresh water account for?

选项

答案three

解析 题目询问淡水资源占多大比例。从关键句“Man can only drink and use the three percent—the fresh water...(人类能饮用水资源仅占3%,即淡水资源……)”可直接得到答案。
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