【2013东营】Thisis3Dprinter.Andthi

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更新 2022-09-03
科目英语
题型单选题
难度中等
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【2013东营】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．/

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