单项选择题

After 72 hours without sleep, Tripp ______.

A．showed mental disorder
B．saw imaginary worms
C．was unable to stand
D．tried to run away from the building
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单项选择题
Tripp imagined all kinds of things ______.
A．when his third day of staying awake came to an end
B．when he was deprived of sleep for 5 days
C．at the end of the experiment
D．after 201 hours and thirteen minutes without sleep
单项选择题
According to the last paragragh, consumers who believe that organic foods axe better than conventionally grown foods are often ______.
A．careless
B．mistaken
C．thrifty
D．skeptical
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