--- What should I do before operating the new machine?
--- You’d better read its ______ first carefully.A.explanationsB.instructionsC.descriptionsD.introductions
网友回答
B解析本题考查名词的词义辨析。explanations“解释，说明”；instructions“说明，指南”；descriptions“描绘，描写”；introductions“介绍，前言”。所以，根据句意应选B。
等。k+s-5#u