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.
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If it had not had this disability it would have ____(毫无疑问的) stayed in the jungle and hunted for food in the customary way.
We may say a violent man is behaving “like a beast”, but, in fact, no beast behaves as ____(暴力地) as man.
At the international level an accumulation of hostile emotions finally finds expression in large-scale impersonal ____(战争) .
Some ____(动物学家) and psychologists compare modern man to a caged lion.