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(yīng)該在不用電腦或者電視的時(shí)候把他們關(guān)掉。A. turn on“打開”；B. turn off“關(guān)掉”；   　　　C. turn up“（聲音）調(diào)大”；D. turn down“（聲音）調(diào)小”。結(jié)合語境，故選B。
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