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Recently people have made great progress in using ______ power of nature to produce ______ electricity.
A.a; theB./ ; /C.the; /D.a; an
C.
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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