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    【题目】Penicillin, _______ chemical in mould that was first discovered in 1928, wasn’t purified to be used as a medicine until _______World WarⅡ.

    A. a; theB. /; /

    C. the; theD. a; /

    【答案】D

    【解析】

    考查冠词。句意：青霉素是1928年首次发现的霉菌中的一种化学物质，直到第二次世界大战后才被提纯用作药物。chemical为名词，此处泛指“一种化学物质”，故用不定冠词a；专有名词前通常使用零冠词，故第二空不填。故选D。

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