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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单项选择题
A．Because they have a driving license.B．Because they have received special training.C．Because the traffic conditions in London are good.D．Because the traffic system of the city is not very complex.
A．Because they have a driving license.
B．Because they have received special training.
C．Because the traffic conditions in London are good.
D．Because the traffic system of the city is not very complex.
单项选择题
A．Doctor and patient.B．Receptionist and client.C．Teacher and student.D．Partners.
A．Doctor and patient.
B．Receptionist and client.
C．Teacher and student.
D．Partners.
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