单项选择题

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