题目内容

Most trainers condition animals by using positive ____(强化), rewarding an animal for doing something correctly, says animal behaviorist Bailey.

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

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

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

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