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
2020-01-09
13
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/CHp7777K
0
大学英语四级
相关试题推荐
A、Smokingistheonlybadhabitthemanshouldchange.B、Shedoesn’tlovethemanasdeepasbefore.C、Shedoesn’twanttohav
A、ToughertimeswillwaitforZimbabwe.B、Theinflationsituationwillbeeased.C、Thefutureoftheinflationisnotclear.D、I
Athirdoftheplanet’slandisseverelydegradedandfertilesoilisbeinglostattherateof24bntonnesayear,accordingto
Athirdoftheplanet’slandisseverelydegradedandfertilesoilisbeinglostattherateof24bntonnesayear,accordingto
A、Thepreferenceforscience.B、Theteachingmethods.C、Theteachingsubjects.D、Theteachinggoals.B
A、Olympiccheerleadersarethesameasothergames’.B、Threegroupsofcheerleadersworkatspeedskating.C、Theall-girlteamr
Thoreausaideducationoftenmadestraight-cutditchesoutoftwistingsmallstreams.ButnotattheEcoDorm,whichhouses36un
Itseemstomethattoday’sprime-timeleaderneedsatop-5listthatclearlylaysouthisorherpriorities.Whetheryou’rerun
A、Theshirtsshranktochildren’ssizeafterbeingwashedonlyonce.B、Hecan’tchangeanotheronefromthestore.C、Hebought
随机试题
与肝细胞癌的发生无关的是
甲房地产开发公司(以下简称甲公司)于2001年12月设立,注册资本为1000万元。2002年1月,甲公司决定开发一商品住宅小区,项目总投资8000万元,并以出让方式取得了该土地使用权。甲公司在该小区开发过程中,以在建工程抵押贷款筹措建设资金。2002年7月
[2011年第007题]在建筑空间序列组织中,图A.1.13的两个示例都采用了:
下列关于应用ProjectControlling模式需注意的问题,不正确的是()。
外币专门借款和一般借款在资本化期间内产生的汇兑损益符合资本化条件时,要予以资本化,不符合资本化条件的计入当期损益()。
格式条款是当事人为了重复使用而预先拟定,并在订立合同时未与对方协商的条款。关于格式条款,下列说法中,错误的是()。
某伤害案犯罪嫌疑人李某被羁押,办案人员为核实案情传唤其到案接受讯问,李某无正当理由未到案。此时,对李某应采取的措施是()。
操作系统是一种(1),作业管理和进程管理是操作系统的重要组成部分。进程管理可把进程的状态分成(2)三种。用户可以通过(3)建立和撤销进程。进程的调度实际上是确定(4)。在批处理系统中,作业管理可把作业流的状态分成(5)四种。
能够实现从指定记录集里检索特定字段值的函数是( )。
VANCOUVERVancouverinwesternCanadaisnamedafterCaptainGeorgeVancouveroftheBritishRoyalNavy.However,CaptainV
最新回复
(
0
)