Human beings have already made use of ______ . ______ can be used to turn salt water into fresh water.

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问题 Human beings have already made use of ______ .
______ can be used to turn salt water into fresh water.

选项 A、Nuclear power
B、Electric power
C、New kinds of power
D、Chemicals and minerals taken from the sea

答案A

解析 本题题干问“什么能源可以把咸水变成淡水”。原文第3句话指出使用核能可以把咸水变成淡水。因此选项A. Nuclear power是正确答案。
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