Question

【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

Answer 1

【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”。