2. 外语
  3. Every animal is a living radiator (散热器) —heat formed in its cells and given off through its skin. Warm blooded animals keep a no

Every animal is a living radiator (散热器) —heat formed in its cells and given off through its skin. Warm blooded animals keep a no

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问题     Every animal is a living radiator (散热器) —heat formed in its cells and given off through its skin. Warm blooded animals keep a normal temperature by continuously replacing lost surface heat; smaller animals, which have more skin for every ounce of body weight, must produce heat faster than big ones. Because smaller animals burn fuels faster, scientists say they live faster. The speed at which an animal lives is determined by measuring the rate at which it uses oxygen. A chicken, for example, uses one half cubic centimeters of oxygen every hour for each gram it weighs. The tiny shrew-mouse (尖鼠) uses four cubic centimeters of oxygen every hour for each gram it weights. Because it uses oxygen eight limes as fast, it is said that the shrew-mouse is living eight times as fast as the chicken. One of the smallest of the warm blooded animals, the humming-bird, lives a hundred times as fast as an elephant. There is a limit to how small a warm blooded animal can be. A mammal or a bird that weights only two and half grams would starve to death. It would burn up its food too rapidly and would not be able to eat fast enough to supply itself more fuel.
选项 A、takes in oxygen for burning fuel
B、burns fuel to produce heat
C、sends out heat through its skin
D、produces heat in its body cells
答案C
解析 文章第一句Every animal is a living radiator—heat formed in its cells and given off through its skin．已经讲明。[A]项只能说明产生热量，与散热无关。[C]项：通过皮肤散热，正合题意。send out=give off“释放(热量，气体等)”。
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