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    【题目】Computers cannot work without ______ from human beings.

    A. expressions B. instructions

    C. prescriptions D. introductions

    【答案】B

    【解析】

    考查名词辨析。句意：没有人类的指令，计算机无法工作。A. expressions表达；B. instructions命令，指示；C. Prescriptions处方；D. introductions介绍。instructions“命令，指示”符合句意。故B选项正确。

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