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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

試題分析：句意：我們應該在不用電腦或者電視的時候把他們關掉。A. turn on“打開”；B. turn off“關掉”；   　　　C. turn up“（聲音）調大”；D. turn down“（聲音）調小”。結合語境，故選B。
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