【題目】【2013東營】This is 3-D printer. And this is an artificial (人工的) ear. Can you believe that scientists printed this artificial ear by this 3-D printer?

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

【答案】A

【解析】

試題分析:句意:這是一臺3D打印機.這是一只人工耳朵.你能相信科學(xué)家們用3D打印機打印了這只人工耳朵嗎?結(jié)合語境可知本句中泛指的是任何一臺3D打印機,故用不定冠詞.three詞首音素是輔音,故不定冠詞,用a.選A.

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