If, however, an animal finds itself in abnormal conditions, it may show ____(不正常的) aggressiveness.
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At the international level an ____(积聚) of hostile emotions finally finds expression in large-scale impersonal warfare.
It is not surprising if in these conditions people behave ____(好斗地) towards each other.
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.