Actual fighting usually only happens in overcrowded conditions，when resources are not enough.Serious injury can result，and old or sick animals may die，leading to a more balanced population size.Under most natural conditions，territoriality is an effective way of maintaining a healthy population.The study of social behaviors such as territoriality in animals may also help us to understand human society.

　　1．What topic is the passage mainly involved in?

　　A．What animals’ territory is usually like.

　　B．How animals deal with different threats.

　　C．How animals defend their territory.

　　D．Where animal fights take place frequently.

　　2．For most animals，what’s their first response to the possible invaders to defend their

　　territory?

　　A．Fighting in groups.

　　B．Threatening and warning.

　　C．Escaping before being hurt.

　　D．Asking partners for help.

　　3．What does the underlined word “exaggerate” in the second paragraph mean?

　　A．enlarge

　　B．change

　　C．shake

　　D．shrink

　　4．An actual fight will happen when________.

　　A．animals meet near the border of their territories

　　B．the invader enters the defender’s territories

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