首页
登录
职称英语
Sleep is very ancient. In the electroencephalographic (脑电图仪的) sense we share
Sleep is very ancient. In the electroencephalographic (脑电图仪的) sense we share
游客
2023-06-27
80
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] According to some scientists’ research findings, dolphins seldom sleep because _____.
选项
A、of their stupidity
B、of their vulnerability
C、there are possible dangers in the ocean
D、aquatic mammals do not need sleep
答案
C
解析
最后一段第2句解释了第1句中所说的“海豚等睡眠少”的原因,C比较确切地反映了文章内容。A、B、D三项都与最后一段开头两句表达的意思无关。
转载请注明原文地址:https://tihaiku.com/zcyy/2788526.html
相关试题推荐
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshare
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshare
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshare
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshare
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshare
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshare
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshare
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshare
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshare
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshare
随机试题
[originaltext](12)Inmanystressfulsituations,thebody’sresponsescani
Thefirstpapermoneylookedmorelikeanotefromonepersontoanotherthanpa
工作地点质量平均风速要求3m/s,工作面直径D=2.5m,送风温度为15℃,车间
在下图所示的网络中 需要实现接入交换机作为PC的网关,实现不同网段
计算机网络系统按数据交换方式划分为( )。A.有线网 B.光纤网 C.电路交
个体工商户生产经营所得适用的超额累进税率为( )。A.5%~30% B.5%
下列关于工程监理的说法,正确的是()nA:对工程实施的科学化监督管理 B:对
关于我国的调解制度,下列说法错误的是( ) A.人民法院主持的民事调解,调解
我国以湖泊而得名的省是()。A.黑龙江省 B.安徽省 C.青海省 D.甘肃
6月10日,大连商品交易所9月份豆粕期货合约价格为3000元/吨,而9月玉米期
最新回复
(
0
)