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 the passage, what was used by sleep researchers
A．Music.
B．Ladder.
C．Charts.
D．Signature.
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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