单项选择题

A．Models of the first airplanes used for mail delivery.
B．Replicas of railway mail cars.
C．Historical stamps.
D．Engravings of nineteenth-century railroad scenes.
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单项选择题
A．The era during which the railroad was the dominant mode of transportation.B．The time during which mail was delivered by horse.C．The point at which airmail began to constitute the bulk of United States’ mail.D．The time period covered in the museum exhibit.
A．The era during which the railroad was the dominant mode of transportation.
B．The time during which mail was delivered by horse.
C．The point at which airmail began to constitute the bulk of United States’ mail.
D．The time period covered in the museum exhibit.
单项选择题
A．Heavy traffic in the cityB．Pollution in the city centerC．The inefficiency of public transportD．The high cost of building car parks in the city center.
A．Heavy traffic in the city
B．Pollution in the city center
C．The inefficiency of public transport
D．The high cost of building car parks in the city center.
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