单项选择题

According to the passage, what was used by sleep researchers

A．Music.
B．Ladder.
C．Charts.
D．Signature.
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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
单项选择题
Targeting children for advertising is controversial because children __________.
A．are unable to analyze and judge advertisements
B．are unable to give consent since they are too young
C．often give off information that may be dangerous to them
D．are not ready to evaluate advertisements or information requests
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