Some zoologists and psychologists compare modern man to a caged lion. Living conditions in ____(拥挤的) cities, they say, are similar to those of animals in a zoo and make the inhabitants unusually aggressive.
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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.
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.