题目内容

By using different methods of conditioning (training animals to act in a particular way in response to a , or signal ____(刺激物), humans can teach animals to perform extraordinary tasks.

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Like humans, explains Bailey, monkeys have opposable ____(大拇指) that face the hand's other fingers so monkeys can pick up objects.

Animals not only make good pets, they sometimes make perfect workers if they have the right ____(特征) and training.

Capuchins learn to open doors, clean up spills, and ____(拧开) bottle tops.

They can even get a sandwich out of the refrigerator and load your favorite tape into the ____(录像机).

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