单项选择题

In which way are the ants different from other non-human societies

A．They do not need to search for food.
B．They do not need to look for shelter.
C．Individuals vary in social status.
D．Individuals perform different functions.

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单项选择题

A policeman has to be trained in criminal law because______.

A．he must work hard to help reform criminals
B．he must believe as professional lawyers do
C．he must be able to tell when and where a crime is committed
D．he must justify the arrests he makes of criminals

单项选择题

It seems that smaller ants perform more of the______.

A．construction tasks
B．domestic tasks
C．defensive work
D．heavy work