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.
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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 NOT true
A．Science answers questions about accurate facts.
B．Science answers questions about observations.
C．Scientists cannot study the social consequences of beliefs.
D．Scientists can study the truth or error of beliefs.
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