单项选择题

Many once prosperous northern mill towns have _________ as industry has moved to the South.

A．condensed
B．shrunk
C．reduced
D．contracted
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单项选择题
I have been advised to take ever _________against catching flu again this winter.
A．prevention
B．precaution
C．preparation
D．prediction
单项选择题
The story of a great river is very often the story of great_________.
A．vegetation
B．navigation
C．civilization
D．irrigation
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