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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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