单项选择题

A．He has trouble stopping.
B．There are too many rocks.
C．Going uphill is difficult.
D．There are too many curves.
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单项选择题
A．Father and daughter.B．Colleagues.C．Friends.D．Husband and wife.
A．Father and daughter.
B．Colleagues.
C．Friends.
D．Husband and wife.
单项选择题
A．In a skating rink.B．On a bike path.C．On the campus sidewalks.D．In the street.
A．In a skating rink.
B．On a bike path.
C．On the campus sidewalks.
D．In the street.
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