【題目】There is _________ escalator in the centre of the building.

A.theB.anC.aD.\

【答案】B

【解析】

句意：那棟建筑物的中央有一個自動電梯。

考查冠詞的用法。A. the表示特指，意為“這，那，這個，那個，這些，那些”。 B. an表示泛指，意為“一”，用于以元音音素開頭的詞前。C. a表示泛指，意為“一”，用于以輔音音素開頭的詞前。D項表示零冠詞（即不使用冠詞）。一般來說，在復(fù)數(shù)可數(shù)名詞、不可數(shù)名詞或?qū)Ｓ忻~前不使用冠詞，escalator是單數(shù)可數(shù)名詞，所以可排除D項。再由句意可知空格處表示泛指，應(yīng)用不定冠詞a/an。escalator是以元音音素開頭的單詞，所以其前用an。故選B。

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