单项选择题

Rivers have been important to man （）

A．since the last century
B．for a very long time
C．since a few hundred years ago
D．since a few years ago

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单项选择题
The things brought down by rivers from the mountains that are useful for cultivation are （）

A．deltas
B．crops
C．fresh water life
D．soil and minerals
单项选择题
Rivers bring （）

A．people and crops
B．life and wealth
C．poverty and death
D．agriculture and bridge
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