单项选择题

This passage states that a person is really asleep only __________.

A．after experiencing a jerk
B．when his EEG reveals no alpha rhythm
C．after the completion of his alpha rhythm
D．when his EEG begins to show an alpha rhythm

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热门试题

单项选择题

According to the first paragraph, children as an Internet market __________.

A．are becoming increasingly rational
B．are using it at an earlier and earlier age
C．has created a growing advertising market
D．are overtaking the adult market due to their spending power

单项选择题

According to the passage, what was used by sleep researchers

A．Music.
B．Ladder.
C．Charts.
D．Signature.