单项选择题

Why does the author give an example in the last paragraph

A．To show how a smuggler is caught.
B．To show a smuggler is afraid of the police.
C．To show to keep a wary eye on couriers is useless.
D．To show mules may keep the profit for themselves.

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单项选择题

The sentence if he is blown in Par

A．1 is closest in meaning to "______".A. if he is arrestedB. if he is recognized, but not necessarily arrestedC. if he is recognized and arrestedD. if he runs away

单项选择题

Meeting foreign language requirements for the Ph.D. ______.

A．is the most frequent reason for dropping out
B．is more difficult for the science candidate than for the humanities candidate
C．is an essential part of many Ph.
D．programsD. does not vary in difficulty among universities