【題目】It is well known that knowledge is________treasure house,but practice is________key to it.
A.a；the
B.the；the
C.a；/
D./；the

【答案】A
【解析】考查冠詞。句意為：眾所周知,知識是寶庫,而實踐是開啟寶庫的鑰匙。第一空是泛指；第二空是特指,即“開啟寶庫的鑰匙”。

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