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.
单项选择题
A．It requires too much traveling. B．It limits interaction among students. C．It will increase class size. D．It will encourage students to watch too much television.
A．It requires too much traveling.
B．It limits interaction among students.
C．It will increase class size.
D．It will encourage students to watch too much television.
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