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.

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单项选择题

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

A．immeasurable.
B．erratic in its rhythm.
C．a brief burst of activity in the brain.
D．controllable.

单项选择题

All scientific truth is tentative because

A．evidence is basically a value judgment.
B．evidence is basically an esthetic judgment.
C．evidence is basically a purposeful judgment.
D．evidence is basically a factual judgment.