单项选择题

For over a million years, our forefathers were basically ______.

A．successful farmers
B．co-operating hunters
C．runners and jumpers
D．skillful sportsmen
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单项选择题
When did hunting for animals become out of date for our forefathers
A．About a million years ago.
B．About 10,000 years ago.
C．Several thousand years ago.
D．The answer is not given.
单项选择题
It is essential for a policeman to be trained in criminal law ______.
A．so that he can catch criminals in the streets
B．because many of the criminals he has to catch are dangerous
C．so that he can justify his arrests in court
D．because he has to know nearly as much about law as a professional lawyer
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