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

A. expressions B. instructions

C. prescriptions D. introductions

【答案】B

【解析】

考查名詞辨析。句意：沒有人類的指令，計算機無法工作。A. expressions表達；B. instructions命令，指示；C. Prescriptions處方；D. introductions介紹。instructions“命令，指示”符合句意。故B選項正確。

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