SAT词汇题!Given the exponential growth of scientific knowledge medicine is far less ___ unsubstantiated fads than it used to be; its record of folly,however,remains an undeniable ___ .答案是vulnerable to,embarrassment,为什么不能填成depen

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SAT词汇题!
Given the exponential growth of scientific knowledge medicine is far less ___ unsubstantiated fads than it used to be; its record of folly,however,remains an undeniable ___ .答案是vulnerable to,embarrassment,为什么不能填成dependent on,impossibility?

原句的意思如下:
鉴于科学知识爆炸性增长,医疗(medicine)已经不像过去一样容易受到未经证实的潮流(空穴来风)的影响.但是,有关医学方面愚蠢行为屡屡发生,还是令人感到尴尬,这一点不可否认.
解析:
医疗不会依赖于(dependent on)未经证实的潮流(unsubstantiated fads),故不能填dependent on.
impossibility 意为“不可能”
exponential growth “爆炸性增长”
record of folly “愚蠢行为的记录”,即荒唐的事屡屡发生
an undeniable embarrassment “不可否认的尴尬”,即这种令人尴尬的事不可否认
medicine 意为“医药”,但译为“医疗”内涵宽泛一点.