单项选择题

A．Walking down a hill.
B．Climbing stairs.
C．Discussing a trip.
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单项选择题
A．Five.B．Four.C．Throe.
A．Five.
B．Four.
C．Throe.
单项选择题
A．Thieves.B．Shop assistant.C．Detectives.
A．Thieves.
B．Shop assistant.
C．Detectives.
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