【題目】Paper is useful invention.Cai Lun invented it around 2000 years ago.

A. aB. anC. theD. 不填

【答案】A

【解析】

句意:紙是一項(xiàng)有用的發(fā)明。蔡倫大約在2000年前發(fā)明了它。

考查冠詞辨析。invention發(fā)明,單數(shù)名詞需用不定冠詞修飾;useful(有用的)以輔音音素開(kāi)頭,需用a。根據(jù)句意語(yǔ)法,可知選A

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