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段落1

NARRATOR

Listen to part of a lecture in a history class.

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段落2

FEMALE PROFESSOR

When early humans wanted to eat meat,

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they hunted wild animals.

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That's how humans got meat for thousands of years.

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But then, around ten thousand years ago,

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humans began to domesticate animals, that is, they began to control animals, to feed them,

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to raise them. And the domestication of animals had a number of benefits for early humans.

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Let's talk about a couple of these benefits.

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段落3

One benefit of animal domestication was that it provided early humans with a more consistent and reliable source of meat.

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When early humans hunted wild animals,

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sometimes they were able to find and catch the animals, but other times they weren't.

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So wild animals were not a reliable source of meat.

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But with domesticated animals, meat was always available.

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For example, goats were one of the first animals to be domesticated.

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They were easily controlled and organized into herds led by a person, a shepherd,

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so they could accompany groups of people as they moved from place to place.

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And whenever the people needed meat, they could eat the goats . . .

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they were always available.

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Another benefit of animal domestication was that domesticated animals could supply a variety of foods other than meat.

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When early humans hunted wild animals, the only kind of food they got was meat.

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But domesticated animals were able to supply, in addition to meat, other kinds of food products.

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For example, let's take a look again at domesticated goats.

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Live goats produce milk.

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So, early humans could collect the milk and drink it.

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And they could also process the milk and turn it into other kinds of food, like yogurt and cheese, which could be stored.

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