Always read the on the bottle carefully and take the right amount of medicine.A. descript

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A. descriptions
(答案→)B. instructions
C. introductions
D. Explanations
解析：考查词义辨析。descriptions 描述，instructions 说明书，introductions 介绍，explanations 解释，句意：总是要认真读瓶子上的说明书吃适量的药。所以选B。