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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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
单项选择题
The_________ of reliable data makes it impossible to reach a prompt decision.
A．dependence
B．consequence
C．presence
D．absence
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