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
2016-10-07
54
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.
The example of dogs and cats in the second paragraph is intended to _____.
选项
A、explain which animals are mammals
B、show the differences between mammals
C、illustrate how shallow dreamless sleep is
D、reveal how smart they are
答案
C
解析
这个例子是为了证明无梦睡眠比较浅,即第2第3句的前半句,所以选C比较合适。所有例子都是为之前或之后的话提供例证,因此,作者使用例子的目的可以从该例子之前或之后的一句话找到。本题中,猫和狗的例子是为了说明其前面的一句话,其他选项与此无关,均可排除。
转载请注明原文地址:https://kaotiyun.com/show/O5Y7777K
0
大学英语四级
相关试题推荐
A、She’llchangeseatswiththeman.B、She’llremainwheresheis.C、Sheissufferingfromthebadillness.D、Sheprefersawindo
Manyyoungpeoplebelievegoodgrades,excellentinternshipswilllandthemtheiridealjob.However,contrarytowhattheythin
A、BoswellwilldefeatothersintheSchoolBoardelection.B、NoonevotedforBoswellintheSchoolBoardelection.C、Boswellis
Geographyisthestudyoftherelationshipbetweenpeopleandtheland.Geographerscompareandcontrastvariousplacesonthee
Becarefulwhatyousayaroundyourdog.Itmightunderstandmorethanyouthink.AbordercollienamedRicorecognizesthename
Stuntpeople(替身演员)arenotmoviestars,buttheyarethehiddenheroesofmanymovies.Theywerearoundlongbeforefilms.E
Byalmostanymeasure,thereisaboominInternet-basedinstruction.Injustafewyears,34percentofAmericanuniversitiesh
Afterthreeyearsofpreciseanalysis,X-raysandinfrared(红外线的)imaging,expertsclaimtohaveuncoveredtheonlysurvivingport
IwasstudyingtheateratSouthernMethodistUniversityinDallasandfeelinganxiousanduncertainaboutmyfuture.WillIbea
IwasstudyingtheateratSouthernMethodistUniversityinDallasandfeelinganxiousanduncertainaboutmyfuture.WillIbea
随机试题
A.风痰闭阻证B.痰火扰心证C.瘀阻脑络证D.心脾两虚E.心肾亏虚“痰浊素盛,痰随风动,风痰闭阻,上干清窍”是痫病何证的病机
对甲型病毒性肝炎患者能做出早期血诊断的检查是
激光构造深度仪测值应与铺砂法的构造深度值建立相关关系,相关系数不得小于0.97。()
频频传来了小鸟的啁啾鸣啭,饭店坐落在公园旁边的一条________的住宅街上,这是伦敦五月之春,但是关上窗看不见外面,听着小鸟啁啾,并不觉得来到了_______的地方。填入横线处最恰当的一项是()
班级活动的主要形式是()。
下列不属于幼儿语言教育内容要求的是()。
在网络层中,为了防止阻塞和死锁,通常采用的方法中包括()。
鼠标器最主要的技术指标是______。
下面属于黑盒测试方法的是()。
打开考生文件夹下的演示文稿yswg.pptx。按照下列要求完成对此文稿的修饰并保存。1.为整个演示文稿应用“波形”主题,全部幻灯片切换方案为“华丽型”、“碎片”,效果选项为“粒子输入”,放映方式为“观众自行浏览”。2.将第一张幻灯片版
最新回复
(
0
)