Certain animals are “hired” for specific jobs ____(以…为基础) their traits, or characteristics.
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“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.
When he gives the command, or stimulus, the dog ____(找出) drugs.