【題目】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】

考查冠詞。句意：青霉素是1928年首次發(fā)現(xiàn)的霉菌中的一種化學(xué)物質(zhì)，直到第二次世界大戰(zhàn)后才被提純用作藥物。chemical為名詞，此處泛指“一種化學(xué)物質(zhì)”，故用不定冠詞a；專有名詞前通常使用零冠詞，故第二空不填。故選D。

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