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单项选择题

A．Reasons for People’s Sleeping.
B．Four Stages of Sleep.
C．Reasons for sleepwalking.
D．A Sleep Experiment.
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热门试题

单项选择题A．Skiing.B．Skating.C．Swimming.D．Jogging.

A．Skiing.
B．Skating.
C．Swimming.
D．Jogging.

单项选择题A．More work as an instructor.B．A higher salary.C．A longer vacation period.D．A research assignment.

A．More work as an instructor.
B．A higher salary.
C．A longer vacation period.
D．A research assignment.