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B

解析试题分析:A. outstanding杰出的,B. certain当然的,C. obvious 显而易见的,D. ordinary普通的,句意:据说这种植物只在一定的条件下散发出奇怪的香味,科学家现在正在想方法弄明白。所以选B。
考点:考查形容词辨析

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