题目内容

【题目】下列动物中，是藏民最重要的牲畜，且有“高原之舟”之称的是（ ）
A.藏绵羊
B.藏山羊
C.牦牛
D.藏羚羊

【答案】C
【解析】解：牦牛是青藏地区代表性的畜种，它的毛厚而长，耐寒力强，体矮身健，善于爬山负重，被称为“高原之舟”．牦牛肉质好，是本区居民的重要肉食来源．
故选：C．

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It includes most of the air and O2 in the atmosphere, so all life on Earth lives here. The closer to the ground, the warmer the air is. Higher up in the troposphere, the air becomes much colder.

The second layer of the atmosphere is the stratosphere. The stratosphere reaches to around 50 kilometers above Earth. Near the top of the stratosphere is the ozone layer (丑氧层). The ozone layer helps protect life on Earth from the sun's UV radiation. Unluckily, there are holes in several parts of the ozone layer. This could cause serious problems for life on Earth.

The third layer of the atmosphere is the mesosphere. It reaches up to around 80 kilometers above Earth. The mesosphere has the coldest temperature in the atmosphere, It can be as cold as -100℃ there.

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A. B. C. D.

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