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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.aB.anC.theD./

A

解析試題分析:句意:這是一個三維打印機,這是一個人工的耳朵,你能相信這是科學家用三維打印機打印的人工耳朵嗎? 本題考查冠詞的用法,3-D printer是以原因因素開頭的,{th }的發(fā)音,結合語境故選A
考點:考查冠詞的用法。

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