单项选择题

The utilization of hydroelectric resources should be stepped up .

A．sustained
B．increased
C．supported
D．encouraged
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单项选择题
The patient s unusual symptoms confoundedeven the most experienced doctor of the hospital.
A．confused
B．hit
C．stimulated
D．confronted
单项选择题
You are not supposed to take advantage ofsuch a little girl by making her work for 50 cents an hour.
A．exploit
B．export
C．expose
D．exchange
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