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Recently people have made great progress in using ______ power of nature to produce ______ electricity.

A. a; the           B. / ;  /             C. the;  /              D. a; an

C.


解析:

解析:考查冠词。第一个空特指自然界的power,所以用定冠词;第二个空后的electricity是不可数名词,所以不用冠词。

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