单项选择题

A．Mountain areas.
B．Small countries.
C．Busy cities.
D．Private business.
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单项选择题
A．Three years.B．Almost four years.C．Two years.D．Three years and one semester.
A．Three years.
B．Almost four years.
C．Two years.
D．Three years and one semester.
单项选择题
A．160.B．120.C．180.D．80.
A．160.
B．120.
C．180.
D．80.
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