题目内容

“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.

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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.

Today, dogs may be employed to ____(闻出) illegal substances in school lockers or earthquake victims buried beneath the rubble of a collapsed building or highway.