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 ____(集中的) and remote.
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Only if hostility and aggression can be expressed in ____(建设性的) activity and non-violent competition, will the human race be able to survive.
A man who may once have been a self-employed ____(工匠), master of his own trade, might now have a boring job in a factory.
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.
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.