It is constructed to hold a large amount of water in tubes or other passages which provide a large area in contact with the atmosphere.
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【单选题】Four specific activities have been identified as major contributors to the desertification process: overcultivation, overgrazing, firewood gathering, and overirrigation. The cultivation of crops has e...
【单选题】How Sled Dogs Work They're physical wonders-able to endure extreme conditions for extensive periods of time while running fast and pulling more than their own weight. Sled (雪橇) dogs have been around f...
A.
Because they are raised by wolves.
B.
Because they can stand most severe weather.
C.
Because they are fastest runner among Arctic animals.