18．He witnessed Yushu，a county in Qinghai Province hit by     unexpected earthquake，but the Yushu people haven't lost heart，vowing to turn their homeland into     more beautiful Yushu．（　�。�
A．a：aB．an；theC．the；aD．an；a

分析 他親眼目睹了玉樹，青海省的一個縣城，被一次意想不到的地震所襲擊的場面；但是玉樹人民并沒有灰心，發(fā)誓要把他們的家園變成一個更加美麗的玉樹．

解答 答案：D
根據(jù)句意可知，第一個空表示泛指"一次意想不到的地震"，由于空缺處之后的單詞unexpected的首字母的發(fā)音為元音/?/；故此處應(yīng)填不定冠詞an；第二個空泛指的是"一個更加美麗的玉樹"，故在more之前加不定冠詞a；故答案為D．

點(diǎn)評 本題考查了冠詞的用法．做本題時，首先根據(jù)句意判斷出空白處表示的是特指還是泛指，然后結(jié)合冠詞的用法，選出正確答案；因此，做此類題時，需要熟練掌握定冠詞，不定冠詞以及零冠詞的具體用法．

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