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 no good ______ him. He is always indifferent towards other's matters.
A．to turn to
B．turning to
C．turn to
D．turned to
单项选择题
We should always keep in mind that ______ decisions often lead to bitter regrets.
A．hasty
B．instant
C．prompt
D．rapid
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