单项选择题

A．About every five minutes.
B．About every seven minutes.
C．About every six minutes.
D．About every eight minutes.
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单项选择题
A．At platform number 3.B．At platform number 4.C．At platform number 5.D．At platform number 6.
A．At platform number 3.
B．At platform number 4.
C．At platform number 5.
D．At platform number 6.
单项选择题
A．In Europe.B．In Australia.C．Here.D．In Austria.
A．In Europe.
B．In Australia.
C．Here.
D．In Austria.
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