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.
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B
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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