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
28
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
WhoLives?WhoDies?WhoDecides?A)SomehavecalleditaRighttoDiecase.OthershavelabeleditaRighttoLivecase.Onegr
WhoLives?WhoDies?WhoDecides?A)SomehavecalleditaRighttoDiecase.OthershavelabeleditaRighttoLivecase.Onegr
Manyoftoday’scollegestudentsaresufferingfromaformofshock.Lisaisagoodexampleofastudentinshock.Sheisanatt
Walking,ifyoudoitvigorouslyenough,istheoverallbestexerciseforregularphysicalactivity.Itrequiresnoequipment,e
IsthereenoughoilbeneaththeArcticNationalWildlifeRefuge(ANWR)tohelpsecureAmerica’senergyfuture?PresidentBushcer
Adecadeago,theideathattheplanetwaswarmingupasaresultofhumanactivitywaslargelytheoretical.Weknewthatsince
Therearerareinstanceswhenjusticealmostceasestobeanabstract【C1】______.Rewardor【C2】______areoutquiteindependentof
Therearerareinstanceswhenjusticealmostceasestobeanabstract【C1】______.Rewardor【C2】______areoutquiteindependentof
随机试题
下列食物中膳食纤维含量最少的是()。
患者男性,35岁,因车祸致外伤,会阴疼痛,排尿困难,不能行走,脸色苍白,送至急症。手术后支架导尿管应当留置的时间为
《中华人民共和国海洋环境保护法》规定:海岸工程建设项目的环境影响报告书经海洋行政主管部门提出()后,报环境保护行政主管部门()。
进行气密性检查时,在试验介质中加入体积分数为1%()。
因采购的货物技术复杂或者性质特殊,不能确定详细规格或者具体要求的,可以采用询价式谈判方式采购。()
真核生物以DNA为遗传物质,部分原核生物以RNA为遗传物质。()
新民主主义文化就是无产阶级领导的人民大众的反帝反封建的文化,即民族的科学的大众的文化。新民主主义文化是“民族的”内涵是()
Writeanessayof160~200wordsbasedonthefollowingdrawing.Inyouressay,youshould:(1)describethedrawingbriefly,(2
以下叙述中正确的是
数据库系统又进一步把对数据逻辑结构的描述分为两个层次:子模式和模式。子模式说的是从一个个具体用户(局部的)角度看到的逻辑结构,模式说的是从全体用户(全局的)角度看到的逻辑结构。这样,整个的数据库系统从面向用户这一端到面向计算机的那一端分作了三个层次:外部层
最新回复
(
0
)