单项选择题

Manchester became an important industrial______ of the UK in the Industrial Revolution.

A．base
B．basis
C．ground
D．foundation
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单项选择题
The chairman of the company said that new techniques had______ improved their production efficiency.
A．violently
B．severely
C．extremely
D．radically
单项选择题
We should make a clear______ between competent and proficient for the purposes of our discussion.
A．separation
B．division
C．distinction
D．difference
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