单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．At the office.
B．At school.
C．At university.
D．In the park.
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单项选择题
A．Mexican.B．Russian.C．Chinese.D．Japanese.
A．Mexican.
B．Russian.
C．Chinese.
D．Japanese.
单项选择题
It is essential for a policeman to be trained in criminal law ______.
A．so that he can justify his arrests in court
B．so that he can catch criminals in the streets
C．because many of the criminals he has to catch are dangerous
D．because he has to know nearly as much about law as professional lawyer
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