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
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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
单项选择题
The director _________the letter to his secretary, who wrote it down in shorthand.
A．dictated
B．granted
C．drafted
D．authorized
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