【題目】Science is ______ useful subject though it is a little difficult.

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

【答案】B

【解析】

句意:科學(xué)是個有用的科目,盡管它有點(diǎn)難。根據(jù)不定冠詞a/an一個,通常用于泛指,a用于輔音因素開頭的單詞前,an用于元音因素開頭的單詞前;定冠詞the這個,那個,通常用于特指,這里一泛指一門有用的學(xué)科,輔音因素開頭;故選B

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