It’s said that this kind of plant only gives off this strange perfume on ________ conditions which the scientists are trying to figure out now.
A．outstandingB．certainC．obvious D．ordinary
B

試題分析：A. outstanding杰出的，B. certain當(dāng)然的，C. obvious 顯而易見(jiàn)的，D. ordinary普通的，句意：據(jù)說(shuō)這種植物只在一定的條件下散發(fā)出奇怪的香味，科學(xué)家現(xiàn)在正在想方法弄明白。所以選B。
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