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.
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单项选择题
A．Compare her own paper with others.B．Watch out for the usual typing mistakes.C．Have someone else type her paper.D．Ask another person to check her work.
A．Compare her own paper with others.
B．Watch out for the usual typing mistakes.
C．Have someone else type her paper.
D．Ask another person to check her work.
单项选择题
A．Through his hard work at training.B．Through his reputation as preacher.C．Through his training as a preacher.D．Through his attention to medicine.
A．Through his hard work at training.
B．Through his reputation as preacher.
C．Through his training as a preacher.
D．Through his attention to medicine.
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