单项选择题

A．More work as an instructor.
B．A higher salary.
C．A longer vacation period.
D．A research assignment.
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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.
A．Reasons for People’s Sleeping.
B．Four Stages of Sleep.
C．Reasons for sleepwalking.
D．A Sleep Experiment.
单项选择题
A．Skiing.B．Skating.C．Swimming.D．Jogging.
A．Skiing.
B．Skating.
C．Swimming.
D．Jogging.
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