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(2014·北京四中3月模考)It is well known that knowledge is________treasure house,but practice is________key to it.
A.a;theB.the;the
C.a;/ D./;the
A
考查冠词。句意为:众所周知,知识是宝库,而实践是开启宝库的钥匙。第一空是泛指;第二空是特指,即“开启宝库的钥匙”。
答案: A
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