单项选择题

The word "subject" (Line 1, Para; 3) refers to __________.

A．measurement
B．instrument
C．dream
D．volunteer
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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
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
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