填空题

【参考答案】

The first airmail service didn’t start until 1918.
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单项选择题
A．To cancel his trip.B．To catch a later flight.C．To go to bed early.D．To ask for a wake-up call.
A．To cancel his trip.
B．To catch a later flight.
C．To go to bed early.
D．To ask for a wake-up call.
填空题
It was during the Age of the Iron Horse that delivery really started to pick up
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