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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

解析试题分析:句意:这是一个三维打印机,这是一个人工的耳朵,你能相信这是科学家用三维打印机打印的人工耳朵吗? 本题考查冠词的用法,3-D printer是以原因因素开头的,{th }的发音,结合语境故选A
考点:考查冠词的用法。

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