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We should _____ the power when our TV or computer is not used.
A.turn onB.turn off   
C.turn up   D.turn down
B

试题分析:句意:我们应该在不用电脑或者电视的时候把他们关掉。A. turn on“打开”;B. turn off“关掉”;      C. turn up“(声音)调大”;D. turn down“(声音)调小”。结合语境,故选B。
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