On March 23 many people took part in “ Lights” activity to help save energy. A. Turn offB

问题补充：

On March 23, many people took part in “ Lights” activity to help save energy.

A. Turn off

B. Show off

C. Take off

D. Put off

答案：

(答案→)A. Turn off

B. Show off

C. Take off

D. Put off

解析：Turn off 关掉；Show off 炫耀；Take off起飞，脱下； Put off推迟，扔掉。句意：在三月二十三日，许多人参加“熄灯活动”，来节约能源。结合语境可知选Ａ。