单项选择题

According to this passage, sleep is described as __________.

A．drowning in an ocean of darkness
B．undisturbed by tension or problems
C．a gradual parting from the real world
D．dependent only upon individual age and health

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单项选择题

According to this passage, sleep is described as __________.

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According to this passage, sleep is described as __________.

According to the passage, what was used by sleep researchers

The word "subject" (Line 1, Para; 3) refers to __________.

According to the author, the alpha state has been shown to be __________.

This passage states that a person is really asleep only __________.