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段落1

NARRATOR

Listen to part of a lecture in a biology class.

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段落2

FEMALE PROFESSOR

There are certain animals that live high in the mountains...

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at altitudes up above the tree line, where trees don't grow.

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And moving around in this mountainous environment can be challenging,

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because the mountain slopes can be very steep and rocky....

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Besides that, there's often ice or snow, making these rocky slopes slippery-and dangerous.

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So animals that live at high altitudes have special features that help them move around in this difficult, mountainous environment.

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段落3

So, for one thing,

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many mountain animals have strong muscles that help them climb up and down the steep slopes.

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As they're moving around, looking for food, they have to climb up these really steep mountainsides, at a dramatic incline,

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and get down again, too.

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For many animals this would be a real problem,

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requiring great strength, and balance.

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Um, mountain goats, which live high up in the mountains in parts of North America...

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mountain goats have a large, well-muscled chest and front-leg area,

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and these big, developed muscles in this area help them pull themselves up these near-vertical slopes,

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and balance in tight positions when climbing down.

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段落4

Also, mountain animals often have specially adapted feet

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that help them keep from slipping when they're walking over ice or rocks.

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High-altitude mountain slopes can be very slippery, especially when there's snow or ice on them,

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and it's a long way down if they fall,

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so mountain animals need to have a safe, sure footing.

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Take the bighorn sheep, for instance....

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These sheep have special toes that move independently

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so they can dig into the rock and ice.

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And the back parts of their feet have special round, rubbery pads that help them grip the surface of the rock or ice,

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to prevent sliding as they move around.

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