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        1. 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(kāi)”;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(yǔ)境,故選B。
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