单项选择题

A．The influence of old people in the U.S.
B．Citizens and life in the U. S.
C．Changes in American families.
D．The old people in the U. S.
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A．Horses and donkeys.B．Cars and E-mails.C．Trains, ships, and planes.D．Satellites.
A．Horses and donkeys.
B．Cars and E-mails.
C．Trains, ships, and planes.
D．Satellites.
单项选择题
A．European tradition.B．Employment.C．Weights and measurements.D．US political system.
A．European tradition.
B．Employment.
C．Weights and measurements.
D．US political system.
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