单项选择题

Classification is a useful ______ to the organization of knowledge in any field.

A．means
B．approach
C．mode
D．manner
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单项选择题
It is quite common for a working man to make ______ for his old age by putting aside enough money to live on.
A．adjustment
B．supply
C．assurance
D．provision
单项选择题
This is an ideal site for a university ______ it is far from The downtown area.
A．provided that
B．now that
C．so that
D．in that
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