It is not surprising if in these conditions people behave ____(好斗地) towards each other.
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If, however, an animal finds itself in abnormal conditions, it may show abnormal ____(敌对的情绪).
The impulse to ____(坚持自己的想法) himself has enabled him to survive in a dangerous world, but, ironically, he is now likely to destroy his own species unless alternative, non-violent ways of expressing aggression can be found.
In fact, it is growing more and more difficult for people to assert themselves as individuals, as towns, nations and organizations become steadily bigger, with authority increasingly ____(集中的) and remote.
Only if hostility and aggression can be expressed in ____(建设性的) activity and non-violent competition, will the human race be able to survive.