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【题目】We should _____ the power when our TV or computer is not used.

A. turn on B. turn off

C. turn up D. turn down

【答案】B

【解析】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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