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