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It is _______ unusual thing for us to find ________ UFO.

A．a; aB．an; anC．a; anD．an; a

D

解析試題分析：句意:對于我們來說,發(fā)現一個不明飛行物是一件不尋常的事情. 結合語境可知前一空泛指任何一件不尋常的事情,故用不定冠詞,unusual的詞首音素是元音,故不定冠詞用an. 后一空泛指任何一個不明飛行物,UFO詞首音素是輔音,故不定冠詞用a,選D.
考點：冠詞
點評：冠詞是一種虛詞，一般用于名詞前面表示特指或者泛指某一個。冠詞的應用都用一定規(guī)則，熟記這些規(guī)則是解題的關鍵。不定冠詞用在名詞前，表示泛指任何一個。定冠詞用在名詞前表示特指某一個。在專有名詞及表示泛指的復數名詞前一般不要冠詞，叫做零冠詞。需注意的是不定冠詞的用法是看詞首音素，不是看首字母，如：useful首字母是元音，但是詞首音素時輔音，故不定冠詞用a；hour首字母是輔音，但是詞首音素是元音，故用冠詞an。

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