问题
选择题
It is well-known to us all that knowledge is __ treasure, but practice is ___ key to it.
A．a, ∕
B．a, the
C．the, the
D．∕ , the
答案
答案：B
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It is well-known to us all that knowledge is __ treasure, but practice is ___ key to it.
A．a, ∕
B．a, the
C．the, the
D．∕ , the
答案：B