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This morning I have _______ art lesson. Art is _______ useful subject.
A.a; a B.an; an C.a; an D.an; a

试题分析:句意:今天上午我上了一节美术课。美术是一门有用的科目。前文art词首音素是元音,故不定冠词用an,下文useful词首音素是辅音,故不定冠词,用a,选D.
点评: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。
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