单项选择题

A．Swimming.
B．Driving.
C．Sleeping outdoors.
D．Canoeing.
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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.
单项选择题
A．By prediction.B．By recording.C．Through observation.D．Through interviewing.
A．By prediction.
B．By recording.
C．Through observation.
D．Through interviewing.
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