She is ______ new comer to _______ chemistry but she hasalready made some important discoveries.

A. the; the B. the; 不填

C. a; 不填 D. a; the

C

【解析】考查定冠詞。一個(gè)表示泛指，學(xué)科前零冠詞。A new comer新人；句意：她在化學(xué)方面是一個(gè)很有潛力的人，而且她已經(jīng)有了一些重要的發(fā)現(xiàn)。故選C。

考點(diǎn)：考查定冠詞。

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