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【题目】—Have you heard about the event of vaccine(疫苗)?

—Yes. It has caused a(n) _________ influence on medicine safety.

A. active B. common

C. medical D. unexpected

【答案】D

【解析】

试题分析:句意:你听说疫苗事件了吗?——是的,它对医药安全产生了不可预期的影响。A. active 积极的;B. common 普通的;C. medical 医学的;D. unexpected意外的,想不到的。结合句意可知,答案为D。

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