单项选择题

In what 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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热门试题

单项选择题

The reason some children are backward in speaking is most probably that ______.

A．they are incapable of learning language rapidly
B．they arc exposed to too much language at once
C．their mothers respond inadequately to their attempts to speak
D．their mothers are not intelligent enough to help them

单项选择题

The scientist's work was based on _______.

A．occasional observations
B．systematic observations
C．observations of several nests
D．observations of undisturbed nests