(2014·北京四中3月模考)It is well known that kno...

(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；the　B．the；the

C．a；/　D．/；the

A 【解析】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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