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．Three.
A．Five.
B．Four.
C．Three.
单项选择题
A．At about 9: 13.B．At about 9: 00.C．At about 9: 30.
A．At about 9: 13.
B．At about 9: 00.
C．At about 9: 30.
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