单项选择题

A．To attend a conference.
B．To see the planetarium.
C．To change planes.
D．To go sightseeing.
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S1. Thus, with one class possessing the requisite knowledge and experience, but lacking incentive and leisure, and the other class lacking the knowledge and experience, there was no means by which technical progress could be achieved.
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.
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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