Science is really _______ useful sucject although it is very difficult.

A. an B. a C. the D. /

 

B

【解析】

試題分析：句意：雖然科學(xué)有點(diǎn)難，但它確實(shí)是一門有用的學(xué)科。根據(jù)句意“一門有用的學(xué)科”是泛指，所以要用不定冠詞，useful開頭字母雖然是元音字母u，但開頭發(fā)音是輔音，所以用不定冠詞a，故選B。

考點(diǎn)：考查冠詞的用法

 

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