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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C
单项选择题
A．Go to the library.B．Get some exercise.C．Go to see a film.D．Do homework in school.
A．Go to the library.
B．Get some exercise.
C．Go to see a film.
D．Do homework in school.
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