单项选择题

A．At a railway station.
B．At an airport.
C．On a road.
D．In an office.
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单项选择题
A．$200.B．$130.C．$180.D．$50.
A．$200.
B．$130.
C．$180.
D．$50.
填空题
______, not white and non-Hispanic, constitutes one-fourth of the present U.S. population.
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