单项选择题

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