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段落1

NARRATOR

Now listen to part of a lecture in a biology class.

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段落2

MALE PROFESSOR

Prairie dogs' re small animals you're likely to find on wide, relatively flat, grassy areas of land in North America.

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They tend to live together in large numbers. Now,

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generally these animals don't come into contact with human beings, but every now and then they do. So

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let's assume that some prairie dogs happen to live in an area where human beings frequently come and go.

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Now, the first time the animals would see a human being,

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they'd instinctively react by making a sharp barking sound-

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like a dog- ...

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and jumping up and down-

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essentially warning or alerting other prairie dogs that are nearby of

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this potential threat.

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Exactly the same way that they'd react if they came upon or were threatened by a snake or a hawk,

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an animal that preys on them.

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Their instinctive reaction would be one of fear.

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They'd keep an eye on the human beings

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until these "scary", possibly threatening, individuals are gone. And

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they're likely to react this way every time they see a human being.

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However, if people pass through the area day after day

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without threatening them or trying to harm them,

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well, it turns out that the prairie dogs will gradually stop barking and jumping up and down when they see a human being passing through the area.

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At some point they'd stop reacting to humans as though they were a threat.

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