单项选择题

A．Take a break.
B．Go to work.
C．Do the other problems.
D．Keep trying.
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单项选择题
A．Swimming.B．Driving.C．Sleeping outdoors.D．Canoeing.
A．Swimming.
B．Driving.
C．Sleeping outdoors.
D．Canoeing.
单项选择题
A．There are no rapids or waterfalls.B．There is a constant, strong wind.C．Navigation is rather difficult.D．Frequent storms cause problems for riverboats.
A．There are no rapids or waterfalls.
B．There is a constant, strong wind.
C．Navigation is rather difficult.
D．Frequent storms cause problems for riverboats.
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