单项选择题

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

A．measurement
B．instrument
C．dream
D．volunteer
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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
单项选择题
According to the passage, what was used by sleep researchers
A．Music.
B．Ladder.
C．Charts.
D．Signature.
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