题目内容

For example, a monkey may be trained to scratch an itch, or slip a ____(软盘) into a computer drive.

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

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.

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.