单项选择题

This passage states than a person is really asleep only ______.

A．after dreaming has stopped
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

All of the following Were suggested as being used by sleep researchers EXCEPT ______.

A．electrodes
B．hypnosis
C．charts
D．recorders

单项选择题

What does stalwart in Even Great Britain, most stalwart of nations… (line 5, paragraph 2) most likely mean

A．forgiving
B．helpful
C．firm and steadfast
D．understanding