题目内容

Like humans, explains Bailey, monkeys have opposable ____(大拇指) that face the hand's other fingers so monkeys can pick up objects.

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Animals not only make good pets, they sometimes make perfect workers if they have the right ____(特征) and training.

Capuchins learn to open doors, clean up spills, and ____(拧开) bottle tops.

They can even get a sandwich out of the refrigerator and load your favorite tape into the ____(录像机).

And speaking of VCRs, animals are even helping scientists make a ____(录像带).