题目内容

If the caged lion, for example, were free to wander on the ____(长满草的) plains of Africa, it would be continually active, ranging over long distances, hunting in family groups.

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Living conditions in crowded cities, they say, are similar to those of animals in a zoo and make the ____(栖居的动物) unusually aggressive.

Some psychologists believe that aggression is a basic human ____(本能) that must be satisfied.

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

The encouragement of competition in all possible fields should tend to diminish the ____(可能性) of war rather than increase it.