单项选择题

22（）

A．good
B．bad
C．deadly
D．healthy

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单项选择题
Energy is obtained from rivers by ______.
A．building bridges across them
B．driving generators into them
C．building dams across them
D．directing them into homes and factories
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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