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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单项选择题
A．He doesn’t have a computer.B．He can’t understand the instructions.C．He needs to take his computer to be repaired.D．He has a Doctors’ degree in computer science.
A．He doesn’t have a computer.
B．He can’t understand the instructions.
C．He needs to take his computer to be repaired.
D．He has a Doctors’ degree in computer science.
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.
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