单选题
In some parts of the world there are large deserts (沙漠). There are no trees
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water there. Travellers must take
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and water with them. The only animal who can walk
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the desert is the camel (骆驼). He can go
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food and water for a long time, and can carry heavy things. People call the
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"the ship of the desert."
The camel is very big. He has one or two humps (驼峰) on his back, short ears and a long
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.
The camel"s humps hold fat (脂肪), and his stomach (胃) holds water in twelve deep pockets. Each pocket
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a mouth. When the camel
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some water, he can get it out of the
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. The camel"s food is
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.