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    【题目】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”。

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