单项选择题

A．The role of inland waterways in the nation’s growth.
B．The development of New York City as a seaport.
C．The growth of the railroads.
D．The disappearance of the canal system.
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A．To attend a conference.B．To see the planetarium.C．To change planes.D．To go sightseein
A．To attend a conference.
B．To see the planetarium.
C．To change planes.
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A．On a train.B．On a ship.C．On a plane.D．On a bus.
A．On a train.
B．On a ship.
C．On a plane.
D．On a bus.
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