首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
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
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
admin
2016-04-30
68
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.
Compare with dreamless sleep, deep dream sleep is _____.
选项
A、not the result of natural selection
B、less likely to appear to primates
C、more protective to the animals
D、at a higher stage of evolution
答案
D
解析
根据第2段倒数第3句及末句,可以推断与无梦睡眠相比,深睡不动处于更高的进化阶段。文中虽有提及无梦睡眠对于被捕食动物来说是一种自然选择,但并不意味着深睡不动不是自然选择。因此A不正确;该句也提到“笨拙的动物与敏捷的动物相比,更少有深睡不动的时候”,primates属于smart ones,因此更有可能深睡不动,B与此相悖;文中暗示无梦睡眠使低级动物更警觉,从而起到一定的保护作用,C正好与这种理解相反,因此也不正确。
转载请注明原文地址:https://kaotiyun.com/show/hqe7777K
0
大学英语四级
相关试题推荐
WhenMomandDadGrowOldA)Theprospectoftalkingtoincreasinglyfragileparentsabouttheirfuturecanbe"oneofthemostd
WhenMomandDadGrowOldA)Theprospectoftalkingtoincreasinglyfragileparentsabouttheirfuturecanbe"oneofthemostd
WhenMomandDadGrowOldA)Theprospectoftalkingtoincreasinglyfragileparentsabouttheirfuturecanbe"oneofthemostd
WhoLives?WhoDies?WhoDecides?A)SomehavecalleditaRighttoDiecase.OthershavelabeleditaRighttoLivecase.Onegr
Manyoftoday’scollegestudentsaresufferingfromaformofshock.Lisaisagoodexampleofastudentinshock.Sheisanatt
Manyoftoday’scollegestudentsaresufferingfromaformofshock.Lisaisagoodexampleofastudentinshock.Sheisanatt
Globalwarmingmayornotbethegreatenvironmentalcrisisofthe21stcentury,butregardlessofwhetheritisorisn’t,wew
Globalwarmingmayornotbethegreatenvironmentalcrisisofthe21stcentury,butregardlessofwhetheritisorisn’t,wew
Therearerareinstanceswhenjusticealmostceasestobeanabstract【C1】______.Rewardor【C2】______areoutquiteindependentof
Therearerareinstanceswhenjusticealmostceasestobeanabstract【C1】______.Rewardor【C2】______areoutquiteindependentof
随机试题
第二审人民法院经审理,对上诉案件的处理原则有()。
分析下列各句中画线词的词性:(1)我们要辩证地看问题。(2)所有人都不得离开。(3)这种情况是很正常的。(4)我们要不断改进服务态度。
下列哪种药物属于襻利尿药
有关合同标的数量、质量、( )违约责任和解决争议方法等的变更,是对要约内容的实质性变更。
根据合同法规定,()可以变更合同。
模块的扇出系数应控制在()以内。
项目人力资源管理的主要工作包括________。
教师职业道德的主要范畴包括教师义务、教师良心、教师荣誉。()
某商场在一次活动中规定:一次购物不超过100元时没有优惠;超过100元而没有超过200元时,按该次购物全额的9折优惠;超过200元时,其中200元按8折优惠,超过200元的部分按5折优惠。若王先生在该商场购买的物品付费180元,则购买的物品在举办活动前需要
A、TheMoonhasnowater.B、TheMoon’smaterialscamefromEarth’score.C、TheMoon’scorediffersfromitssurface.D、TheMoo
最新回复
(
0
)