She is _____ newcomer to _____chemistry but she has already made some important discoveries.
A．the; theB．the; /C．a(chǎn); /D．a(chǎn); the
C

試題分析：考查冠詞：第一空是泛指：一個(gè)新來(lái)的人，第二空不填，因?yàn)閏hemistry是學(xué)科，前面不加冠詞。句意：她是剛剛學(xué)習(xí)化學(xué)的，但她已經(jīng)有一些重要發(fā)現(xiàn)了。選Ｃ。
點(diǎn)評(píng)：對(duì)于冠詞，要注意不定冠詞表示泛指，定冠詞表示特指。還有不加冠詞的時(shí)候。
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