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
24
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://jikaoti.com/ti/O4uFFFFM
0
大学英语四级
相关试题推荐
WhenMomandDadGrowOldA)Theprospectoftalkingtoincreasinglyfragileparentsabouttheirfuturecanbe"oneofthemostd
Manyoftoday’scollegestudentsaresufferingfromaformofshock.Lisaisagoodexampleofastudentinshock.Sheisanatt
Globalwarmingmayornotbethegreatenvironmentalcrisisofthe21stcentury,butregardlessofwhetheritisorisn’t,wew
Globalwarmingisatrendtowardwarmerconditionsaroundtheworld.Partofthewarmingisnatural;wehaveexperienceda20,00
Globalwarmingisatrendtowardwarmerconditionsaroundtheworld.Partofthewarmingisnatural;wehaveexperienceda20,00
Adecadeago,theideathattheplanetwaswarmingupasaresultofhumanactivitywaslargelytheoretical.Weknewthatsince
TheincreasingAmericanizationofJapaneselifeisevidentinmanyways.Onesuchwayisthegrowingpopularityofcreditcards.
UniversitiesBranchOutA)Asneverbeforeintheirlonghistory,universitieshavebecomeinstrumentsofnationalcompetitionas
Therearerareinstanceswhenjusticealmostceasestobeanabstract【C1】______.Rewardor【C2】______areoutquiteindependentof
Therearerareinstanceswhenjusticealmostceasestobeanabstract【C1】______.Rewardor【C2】______areoutquiteindependentof
随机试题
下列各句中“颜色”的意义与其他三句不同的是()
患儿,男,10岁。左上1及右上1嵌入性脱位。正确的处理方式是
链斗式挖泥船适于施工的自然环境条件为()。
关于玻璃幕墙安装施工安全措施的说法,正确的是()。
Inresponsetoscandalsrockingthestudentloanindustry,theHousehasquicklypassedreformlegislationtorequiremorediscl
阅读以下说明,回答问题1至问题3,将解答填入答题纸的对应栏内。【说明】某企业的IT部门为了细化工作分工,理顺管理流程,安排工程师小张负责本企业的网络硬件及相关设施管理。小张在明确了工作范围后,对工作内容做了初步规划,列出了以下三项主要工作。
如果在窗体上添加一个通用对话框控件DBT,那么语句“DBT.Action=4”的作用是
某系统结构图如图所示。该系统结构图的深度是()
Theoldideathatchildprodigies(神童)"burnthemselves"or"overtaxtheirbrains"intheearlyyears,therefore,arepreytofai
WhatisMr.Bacon’sjobspecifically?
最新回复
(
0
)