题目内容

In ____(史前的) times a group of about 60 people had many kilometres of empty land to wander and search for food in.

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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 centralized and ____(遥远的).

At the international level an accumulation of hostile emotions finally finds expression in large-____(规模) impersonal warfare.

Nevertheless, should a fight follow, neither creature will be badly hurt, for the loser will save himself by making a gesture of ____(屈服).

When a ____(领域性的) animal or bird intrudes on the territory of another creature of the same species, the latter will only perform some hostile gestures to warn off the intruder.