题目内容

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

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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.

A small firm that once worked as a team to produce high-quality goods is likely to be absorbed into a vast organization where their work is ____(机械的) and there is no possibility for personal expression.

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