题目内容

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
冠词是一种虚词，一般用于名词前面表示特指或者泛指某一个。冠词的应用都用一定规则，熟记这些规则是解题的关键。不定冠词用在名词前，表示泛指任何一个。定冠词用在名词前表示特指某一个。在专有名词及表示泛指的复数名词前一般不要冠词，叫做零冠词。需注意的是不定冠词的用法是看词首音素，不是看首字母，如：useful首字母是元音，但是词首音素时辅音，故不定冠词用a；hour首字母是辅音，但是词首音素是元音，故用冠词an。句意:这是一台3D打印机.这是一只人工耳朵.你能相信科学家们用3D打印机打印了这只人工耳朵吗?结合语境可知本句中泛指的是任何一台3D打印机,故用不定冠词.three词首音素是辅音,故不定冠词,用a.选A.
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