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
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(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。