单项选择题

The less crowded the space is, ______.

A．the more rats like to sleep and eat
B．the less rats want to live with others
C．the more rats try to kill each other
D．the less likely rats bite and kill each other

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单项选择题

The writer is mainly talking about ______.

A．a person's living space needs
B．building and floors
C．equipment and conditions
D．population and violence

单项选择题

According to recent studies ______.

A．rats like to live in overcrowded conditions
B．men's behaviour and health are not related with the living space
C．living conditions affect rat's behaviour and health
D．None of the above