单项选择题

Techniques to employ the energy of the sun are being developed.

A. convert
B. store
C. use
D. receive
<上一题 目录 下一题>
热门 试题

单项选择题
During the past ten years there have been dramatic changes in the international situation.
A. permanent
B. powerful
C. striking
D. practical
单项选择题
The old concerns lose importance and some of them vanish altogether.
A. develop
B. disappear
C. link
D. renew
相关试题