— What should I do before operating the new machine?
— You’d better read its ______ first carefully.
A．explanationsB．instructionsC．descriptionsD．introductions
B
本題考查名詞的詞義辨析。explanations“解釋，說明”；instructions“說明，指南”；descriptions“描繪，描寫”；introductions“介紹，前言”。所以，根據(jù)句意應選B。
等。 
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