题目内容

Primates may not be good____(嗅探者) , but they can certainly lend a helping hand or two.

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First, monkeys are placed with a foster family to become ____(社交化的) to people.

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.

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.

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