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 问题问“人类能使用的水在地球上总的水量中占百分之几?”选项中都是百分数的形式,因此注意文章中包含百分数的句子。于是在第一段找到答案相关句,确认答案为D(小于3%)。
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