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
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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
单项选择题
The author implies that there is cause for concern if consumers with limit ed incomes buy organic foods instead of conventionally grown foods be cause ______ .
A．organic goods can be more expensive but are often no better than conventionally grown foods
B．many organic foods are actually less nutritious than similar conventionally grown foods
C．conventionally grown foods are more readily available than organic foods
D．too many farmers will stop using conventional methods to grow food crops
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