单项选择题

A．To climb hills.
B．To gain traction.
C．To fool its enemies.
D．To rest as it moves.
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单项选择题
A．Failure to rest during the day. B．Lack of sleep on weekends. C．Vigorous exercise in the evening. D．Eating cheese before going to bed.
A．Failure to rest during the day.
B．Lack of sleep on weekends.
C．Vigorous exercise in the evening.
D．Eating cheese before going to bed.
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