题目内容

A tiger that once came out of the jungle into a village and attacked a man was later found to have an injured paw that had ____(明显地) prevented it from hunting its usual prey.

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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.

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.

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