题目内容

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

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After repeating this game of hide-and-seek many times, the dog begins to “associate the ____(气味) with a reward,” says Berkowitz.

That's because dogs have millions of ____(嗅觉的) receptors, or smell nerves, in their noses.

Like humans, explains Bailey, monkeys have thumbs ____(可相对的) that face the hand's other fingers so monkeys can pick up objects.

Monkeys are perfect helpmates for quadriplegics, people ____(使瘫痪) from the neck down who are unable to use their own hands (and legs).