首页
登录
职称英语
Sleep is very ancient. In the electroencephalographic(脑电图仪的)sense we share i
Sleep is very ancient. In the electroencephalographic(脑电图仪的)sense we share i
游客
2023-07-12
13
管理
问题
Sleep is very ancient. In the electroencephalographic(脑电图仪的)sense we share it with all the primates(灵长类动物)and almost all the other mammals and birds: it may extend back as far as the reptiles(爬行动物).
There is some evidence that the two types of sleep, dreaming and dreamless, depend on the life style of the animal, and that predators(食肉动物)are statistically much more likely to dream than prey, which are in turn much more likely to experience dreamless sleep. In dream sleep, the animal is powerfully immobilized(使固定不动)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. 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 immobilized 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 sleep very little. There is, by and large, no place to hide in the ocean. Could it be that, rather than increasing an animal’s vulnerability, Ray Meddis of London University has suggested this to be the case. It is conceivable that animals that are too stupid to be quite on their own initiative are, during periods of high risk, immobilized by the 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. [br] The example of dogs and cats in the second paragraph is intended to ______.
选项
A、explain which animals are mammals
B、show the differences between mammals
C、illustrate how shallow dreamless sleep is
D、reveal how smart they are
答案
C
解析
这个例子是为了证明无梦睡眠比较浅,即第3句的前半句,所以选C比较合适。
转载请注明原文地址:https://tihaiku.com/zcyy/2829591.html
相关试题推荐
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)sensewesharei
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)sensewesharei
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)sensewesharei
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)sensewesharei
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)sensewesharei
随机试题
WetendtothinkofthedecadesimmediatelyfollowingWorldWarIIasatime
TheStreet-LevelSolution[A]WhenIwasgrowingup,oneo
【B1】[br]【B6】A、fallingB、emergenceC、arrivalD、appearingC词义辨析题。falling落下,emerg
按引发的原因不同,工程变更的情况一般可归纳为( )。A.因设计不合理而引起的工
宅基地使用权的权利取得方式是( )。A.集体经济组织分配 B.集体经济组织出
网络安全机制主要包括接入管理、()和安全恢复等三个方面。A.安全报警 B.安
( )是指一国或地区在一年内各类投资主体所完成的固定资产投资总量,或各个施工项
Thechangeinthatvillagewasmiraculou
金融期货和金融远期合约的重要区别在于( )。A.金融远期合约能够降低风险,但金
2015年5月23日8时30分,该厂电炉车间电炉班在更换1号电炉炉体后,班长甲与
最新回复
(
0
)