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
This passage states that a person is really asleep only
A．after dreaming has passed.
B．when his EEG reveals no alpha rhythm.
C．when his EEG begins to show an alpha rhythm.
D．after the completion of his alpha rhythm decline.
单项选择题
Which statement is true
A．A question is important and therefore it is scientific.
B．A question is unscientific and therefore no scientist believes it.
C．A fact is a descriptive statement upon which all qualified observers agree in believing to be accurate.
D．Scientists sometimes study metaphysics.,
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