(2014·北京四中3月�？�)It is well known that knowledge is________treasure house，but practice is________key to it.
A．a(chǎn)；theB．the；the
C．a(chǎn)；/　D．/；the
A
考查冠詞。句意為：眾所周知，知識(shí)是寶庫(kù)，而實(shí)踐是開(kāi)啟寶庫(kù)的鑰匙。第一空是泛指；第二空是特指，即“開(kāi)啟寶庫(kù)的鑰匙”。
答案：　A
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