题目内容

For five years, families help the monkeys ____(适应) a human environment, so the monkeys will trust and enjoy being around people.

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Certain animals are “hired” for specific jobs ____(以…为基础) their traits, or characteristics.

“Dogs love to retrieve objects so the towel becomes a reward,” says Morris Berkowitz, who ____(领导) a canine drug-sniffing program in New York.

By using different methods of conditioning (training animals to act in a particular way ____(作为…的回应) a stimulus, or signal), humans can teach animals to perform extraordinary tasks.

Primates may not be good sniffers, but they can certainly ____(提供帮助或支持) or two.

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