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It’s a good habit to turn off the unnecessary lights, it can help save       .
A.spaceB.energyC.timeD.food
B

试题分析:句意:关掉不需要的灯是一个好习惯,它能助于节约能源。A. space 空间;B. energy能量,能源;C. time 时间;D. food食物。故选B。
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