— What should I do before operating the new machine?— You’d better read its first careful

— What should I do before operating the new machine?
— You’d better read its first carefully.
A. explanations
B. instructions
C. descriptions
D. introductions

A. explanations(答案→)B. instructionsC. descriptionsD. introductions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

正好我需要