单项选择题

A．They would get smaller in size.
B．Their signals would travel further.
C．They would become less popular than television.
D．They would be common household items.
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单项选择题
A．Models of the first planes used for mail delivery. B．A copy of a railway mail car. C．All the unusual stamps. D．A motorbike.
A．Models of the first planes used for mail delivery.
B．A copy of a railway mail car.
C．All the unusual stamps.
D．A motorbike.
填空题
B
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