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.
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