题目内容

In the zoo it is probably better fed and ____(关心), but it is evidently bored and frustrated for lack of company.

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At the international level an accumulation of hostile emotions finally ____(在……中表达出来) in large-scale impersonal warfare.

However, aggression ____(本身) is not necessarily a bad thing. Some psychologists believe that aggression is a basic human instinct that must be satisfied.

If constructive means are not available to satisfy this instinct, man will ____(求助于) destructive means.

When a territorial animal or bird intrudes on the territory of another creature of the same species, the latter will only perform some hostile gestures to ____(告诫……离开某地) the intruder.