The doctor informed his patient that the drug was very ______and can have unpleasant side-effects.

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问题 The doctor informed his patient that the drug was very ______and can have unpleasant side-effects.

选项 A、potent
B、efficient
C、intricate
D、fragile

答案A

解析形容词词义辨析。potent“强有力的”；efficient“高效的”；intricate“复杂的，难懂的”；fragile“容易碎的”。根据句中unpleasant side—effects判定，应是the drug的药劲很大。故答案为A。

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