8．It is well-known that knowledge is ______ treasure house，but practice is ______ key to it．（　�。�
A．a； theB．the； theC．a； 不填D．不填； the

分析 眾所周知，知識是財(cái)富的寶庫，但是實(shí)踐是它的鑰匙．

解答 答案：A
根據(jù)句意可知，第一個(gè)空表示泛指"一所知識的寶庫"，故用不定冠詞a；第二空表示特指打開這所寶庫的鑰匙，這里應(yīng)填定冠詞the；故選A．

點(diǎn)評 本題考查了冠詞的用法．做本題時(shí)，首先根據(jù)句意判斷出空白處的意義特征（表示特指還是泛指），然后結(jié)合定冠詞及不定冠詞的用法，選出正確答案；因此，做此類題時(shí)，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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