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
2023-07-15
50
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, rattier 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/2838016.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)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
Languageacquisitionisoneofthecentraltopicsincognitivescience.Eve
PlanB:SkipCollegeWhat’sthekeytosuccessinth
销售额增幅最大的月份是()。 A.2月B.5月C.6
边际报酬递减规律是在下述哪种情况下发生的?( ) A.按比例连续增加各种生产
清廉金融产品,强调金融产品的()是金融客户关注的重点,必须经得起客户及社会
商业银行根据各业务职能部门和分支机构的经营业绩、风险状况、制度执行以及经济形势、
患者女性,20岁。骑自行车时,不慎跌倒伤及外阴部位,形成外阴血肿,24小时后需进
下列说法不正确的是( )。A.对于按月还本付息的个人住房贷款而言,合理的贷款期
境内单位和个人发生的下列跨境应税行为中,适用增值税零税率的是()。A.向境
(2021年真题)根据《建设工程质量保证金管理办法》,保证金总预留比例不得高于工
最新回复
(
0
)