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．She doesn’t know the person calling.B．She’ll pay for the call.C．She’ll charge the purchase.D．She’ll call Mike back.
A．She doesn’t know the person calling.
B．She’ll pay for the call.
C．She’ll charge the purchase.
D．She’ll call Mike back.
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.
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