单项选择题

The recording of eye-movements during sleep is （）.

A．a kind of experiment
B．to know how to deal with eye-movements
C．an unusual and dangerous recording
D．to know the exact time when eye-movements happen

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单项选择题（） doesn't matter much.

A．The disturbance of sleep
B．The disturbance of dreaming
C．The personality disorder
D．Each of the above

单项选择题People's dreams are （） accompanied with eye-movements.

A．not
B．maybe
C．seldom
D．mostly