题目内容
Like humans, explains Bailey, monkeys have thumbs ____(可相对的) that face the hand's other fingers so monkeys can pick up objects.
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Monkeys are perfect helpmates for quadriplegics, people ____(使瘫痪) from the neck down who are unable to use their own hands (and legs).
Monkeys are perfect helpmates for____(四肢瘫痪者) , people paralyzed from the neck down who are unable to use their own hands (and legs).
Most trainers condition animals by using positive ____(强化), rewarding an animal for doing something correctly, says animal behaviorist Bailey.
“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.
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