单项选择题

A．National unity.
B．Cheap transportation.
C．The decline of Atlantic seaports.
D．Movement of the population.
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单项选择题
A．On foot and by boat.B．By car and on foot.C．By air and by car.D．By air and by bus.
A．On foot and by boat.
B．By car and on foot.
C．By air and by car.
D．By air and by bus.
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