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
Rivers bring ______.
A．people and crops
B．life and wealth
C．poverty and death
D．agriculture and bridge
单项选择题
In many modem countries, children go to school ______.
A．be free education
B．to be able to marry
C．to work for society
D．to rid, themselves of "low" work
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