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第1段

1 .<-NARRATOR:-> Listen to part of a lecture in a history class.

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第2段

1 .<-FEMALE PROFESSOR:-> When early humans wanted to eat meat,

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2 .they hunted wild animals.

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

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4 .But then, around ten thousand years ago,

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

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

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7 .Let's talk about a couple of these benefits.

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第3段

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

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2 .When early humans hunted wild animals,

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

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4 .So wild animals were not a reliable source of meat.

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5 .But with domesticated animals, meat was always available.

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

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

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

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

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10 .they were always available.

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

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

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

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

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15 .Live goats produce milk.

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

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17 .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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