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