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    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 他亲眼目睹了玉树，青海省的一个县城，被一次意想不到的地震所袭击的场面；但是玉树人民并没有灰心，发誓要把他们的家园变成一个更加美丽的玉树．

    解答 答案：D
    根据句意可知，第一个空表示泛指"一次意想不到的地震"，由于空缺处之后的单词unexpected的首字母的发音为元音/?/；故此处应填不定冠词an；第二个空泛指的是"一个更加美丽的玉树"，故在more之前加不定冠词a；故答案为D．

    点评 本题考查了冠词的用法．做本题时，首先根据句意判断出空白处表示的是特指还是泛指，然后结合冠词的用法，选出正确答案；因此，做此类题时，需要熟练掌握定冠词，不定冠词以及零冠词的具体用法．

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