题目内容:
In order to save the energy, we should ________ lights in time if we don’t need them.
A.turn up
B.turn down
C.turn off
D.turn on
参考答案:
答案解析:
In order to save the energy, we should ________ lights in time if we don’t need them.
A.turn up
B.turn down
C.turn off
D.turn on