单项选择题

The use of the term "subjects" in the selection refers to

A．waves.
B．dreams.
C．volunteers.
D．measurements.
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单项选择题
All of the following were suggested as being used by sleep researchers except
A．projection.
B．hypnosis.
C．charts.
D．recorders.
单项选择题
Sleep is described as
A．a gradual parting from the real world.
B．undisturbed by tension or problems.
C．drowning in an ocean of darkness.
D．dependent only upon individual age and health.
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