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1、2023新概念英语优美背诵短文新概念英语美丽背诵短文引导语：说起睡觉信任大家都很熟识，那么大家知道睡眠也是有进化的么下面就让我通过一那么新概念英语美丽短文告知你关于睡眠的进化。Evolution of Sleep睡眠的进化Sleep is very ancient. In the electroencephalographic sense we share it with all the primates and almost all the other mammals and birds: it may extend back as far as the reptiles.睡眠自古就有。从脑
2、电图上看，我们人类和全部灵长目动物以及几乎全部的哺乳动物和鸟类都一样须要睡眠;甚至爬行类动物也有睡眠。There is some evidence that the two types of sleep, dreaming and dreamless, depend on the life-style of the animal, and that predators are statistically much more likely to dream than prey, which are in turn much more likely to experience dreamless
3、sleep. In dream sleep, the animal is powerfully immobilized and remarkably unresponsive to external stimuli. Dreamless sleep is much shallower, and we have all witnessed cats or dogs cocking their ears to a sound when apparently fast asleep.有证据显示，有梦睡眠和无梦睡眠这两种类型的睡眠取决于该动物的生活方式。从统计上看，食肉动物比被捕食动物有更多的有梦睡眠
4、，而被捕食动物更多地无梦睡眠。动物在有梦睡眠时，被有效地解除动作实力，并且对外界刺激缺乏反响。无梦睡眠那么要浅得多。我们都看到过猫和狗在明显的酣睡中，有一点响动耳朵就会竖起来。The fact that deep dream sleep is rare among prey today seems clearly to be a product of natural selection, and it makes sense that today, when sleep is highly evolved, the stupid animals are less frequently immo
5、bilized by deep sleep than the smart ones. But why should they sleep deeply at all Why should a state of such deep immobilization ever have evolved Perhaps one useful hint about the original function of sleep is to be found in the fact that dolphins and whales and aquatic mammals in general seem to
6、sleep very little. There is, by and large, no place to hide in the ocean.被捕食动物很少有深度的有梦睡眠，这看来明显是自然选择的结果。而且这一点是有道理的：当睡眠高度进化以后，愚笨的动物比聪明的动物更少在深度睡眠状态下丧失动作实力。但是动物为什么要进入深度睡眠呢为什么这样的无动作状态也会进化出来呢海豚、鲸鱼以及水生哺乳动物睡眠都极少，这一事实可以给睡眠的根本功能供给有用的线索。海洋中是没有藏身之处的。Could it be that, rather than increasing an animal's vulne
7、rability, the function of sleep is to decrease it Wilse Webb of the University of Florida and Ray Meddis of London University have suggested this to be the case. It is conceivable that animals who are too stupid to be quiet on their own initiative are, during periods of high risk, immobilized by the
8、 implacable arm of sleep. The point seems particularly clear for the young of predatory animals. This is an interesting notion and probably at least partly true.会不会是这样，睡眠不但不增加动物受损害的可能性，反而是削减了这种可能性呢佛罗里达高校的Wilse Webb和伦敦高校的Ray Meddis认为状况就是如此。可以想像得出，在危急的时刻，那些由于太愚笨而不能自动保持宁静的动物，会不由自主地变得动弹不得。这一点在食肉动物的幼兽身上表现得特殊明显。这是一个很有意思的看法，它至少是局部正确的。本文来源：网络收集与整理，如有侵权，请联系作者删除，谢谢！第1页 共1页第 1 页 共 1 页第 1 页 共 1 页第 1 页 共 1 页第 1 页 共 1 页第 1 页 共 1 页第 1 页 共 1 页第 1 页 共 1 页第 1 页 共 1 页第 1 页 共 1 页第 1 页 共 1 页
