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Hibernation-冬眠
Hibernation is more than sleep. It is a very deep sleep. The animal's temperature drops to just over zero centigrade, and its heart beats very slowly. People who find hibernating animals asleep often think that they are dead: the body feels very cold, and the creature may breathe only once every five minutes. A hibernating animal cannot feel any pain. You can touch it, or even pull its tail, without causing it to move or wake up. In its hibernating state it can even live in a poisonous atmosphere for a long time without any ill effect.
Hibernating in this way, the animal can sleep all through the winter. You might wonder how it manages to live without eating for so many months. The answer lies in two facts. The first is that it has stored supplies of fat in its body during the summer and autumn. The second is connected with the main use the body makes or rood——to supply the energy for movement. We have seen that hibernating animal reduces movement to far below the ordinary level. Even the movements or the heart and lungs are greatly reduced. The animal hardly makes any movement, hardly use any energy, and hardly needs any rood.
Some animals, including some bears only hair hibernate. That is to say, they sleep during the winter, but their sleep is not deep and their body temperature does not drop, as they are warm blooded animals. In the antumn the bear eats and eats and becomes very rat. His hair grows longer. Soon he has a thick covering or rat and fur. In November he rinds a place to lie down and goes to sleep. On warm winter days he may think spring has arrived;he gets up and wa[ks around. When he sees that the snow is still thick on the ground, he quickly goes to sleep again.
此文是一篇非常好的背景材料。有关动物冬眠我们或许有所了解，但也许是一知半解。文章先叙述了动物冬眠时的状况，而后详细说明了为什么有些动物能做到冬眠，最后还举例说明了半冬眠动物熊的情况，使读者丰富了这方面的知识。
2.英语单词大全 冬天有哪些动物冬眠
具有冬眠习性的动物有很多.但集中分布在温带和寒带.下面列举的动物也是指生活在温带和寒带的.
(1)爬行动物.如蛇类、蜥蜴类、龟类等动物。
(2)两栖动物.如蛙类.
(3)鱼类.
(4)软体动物.如蜗牛、贝类等。
(5)而且相当一部分的多年生昆虫类动物也有冬眠习性.
(6)一些小型哺乳动物也有冬眠习性.如鼠类、蝙蝠、獾类、貂类、刺猥等。
(7)大型哺乳动物中仅有熊类有冬眠的习性.如黑熊、棕熊、马熊、北极
3.【给我2
Hibernation-冬眠 Hibernation is more than sleep. It is a very deep sleep. The animal's temperature drops to just over zero centigrade, and its heart beats very slowly. People who find hibernating animals asleep often think that they are dead: the body feels very cold, and the creature may breathe only once every five minutes. A hibernating animal cannot feel any pain. You can touch it, or even pull its tail, without causing it to move or wake up. In its hibernating state it can even live in a poisonous atmosphere for a long time without any ill effect. Hibernating in this way, the animal can sleep all through the winter. You might wonder how it manages to live without eating for so many months. The answer lies in two facts. The first is that it has stored supplies of fat in its body during the summer and autumn. The second is connected with the main use the body makes or rood——to supply the energy for movement. We have seen that hibernating animal reduces movement to far below the ordinary level. Even the movements or the heart and lungs are greatly reduced. The animal hardly makes any movement, hardly use any energy, and hardly needs any rood. Some animals, including some bears only hair hibernate. That is to say, they sleep during the winter, but their sleep is not deep and their body temperature does not drop, as they are warm blooded animals. In the antumn the bear eats and eats and becomes very rat. His hair grows longer. Soon he has a thick covering or rat and fur. In November he rinds a place to lie down and goes to sleep. On warm winter days he may think spring has arrived;he gets up and wa[ks around. When he sees that the snow is still thick on the ground, he quickly goes to sleep again.此文是一篇非常好的背景材料.有关动物冬眠我们或许有所了解，但也许是一知半解.文章先叙述了动物冬眠时的状况，而后详细说明了为什么有些动物能做到冬眠，最后还举例说明了半冬眠动物熊的情况，使读者丰富了这方面的知识.。
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