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  3. The phrase "the world" in the first line of the passage refers to What percentage of the earth’s water can man actually use at

The phrase "the world" in the first line of the passage refers to What percentage of the earth’s water can man actually use at

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问题 The phrase "the world" in the first line of the passage refers to
What percentage of the earth’s water can man actually use at present?
选项 A、Nearly 75 per cent.
B、About 97 per cent.
C、Exactly 3 per cent.
D、Less than 3 per cent.
答案D
解析
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