单项选择题

Have you a funny ______ or unusual experience that you would like to share

A．amusement
B．incident
C．accident
D．section
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单项选择题
The underlined word subjects (Para. 4) refers to ______.
A．the performance tests used in the study of sleep deficit
B．special branches of knowledge that are being studied
C．people whose behavior or reactions are being studied
D．the psychological consequences of sleep deficit
单项选择题
People in the 18th and 19th centuries used to sleep about 9.5 hours a night because they had ______.
A．no drive or ambition
B．no electric light
C．the best sleep habits
D．nothing to do in the evening
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