单项选择题

From the passage, we can infer that "popular" words are （）.

A．essential to daily life
B．not regular in usage
C．convenient to use
D．not*standard enough to be used

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单项选择题
The author suggests that a man becomes a philosopher when he （）.

A．studies philosophy as a subject
B．collects all the facts
C．realizes obvious truths
D．seeks a meaning for life
单项选择题
The average number of hours of sleep that an adult needs is （）.

A．approximately six hours
B．around ten hours
C．about eight hours
D．not stated here
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