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(chǎn)B．a(chǎn)nC．theD．/

A

解析試題分析：句意：這是一個(gè)三維打印機(jī)，這是一個(gè)人工的耳朵，你能相信這是科學(xué)家用三維打印機(jī)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(kāi)頭的，{th }的發(fā)音，結(jié)合語(yǔ)境故選A
考點(diǎn)：考查冠詞的用法。

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