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．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.
单项选择题
A．In order to sail upstream.B．In order to control the flood.C．In order to attract visitors.
A．In order to sail upstream.
B．In order to control the flood.
C．In order to attract visitors.
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