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
2010-08-04
56
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.
Predators are _______.
选项
A、able to prey even when they are in deep dream sleep
B、more likely to experience dream sleep
C、incapable of preying when immobilized by dreamless sleep
D、good at preying on stupid animals
答案
B
解析
主要依据该段第1句第3个分句选择B。
转载请注明原文地址:https://kaotiyun.com/show/hCA7777K
0
大学英语四级
相关试题推荐
Asociety’seconomic【B1】______anditsculture,ortraditionsandwayoflife,also【B2】______theclothingthatitspeoplewear.I
A、Noalcoholisallowedinthehospital.B、Nosmokingisallowedinthehospital.C、Thepatientshouldwakeupat6:30inthemo
A、Theundergroundoilresourceshavenotbeenaffected.B、Mostofthedesertanimalsandplantshavemanagedtosurvive.C、Theo
A、Onlyafewchangesshouldbemadeinit.B、It’snotfineasitis.C、Itwon’tbeapprovedbythesupervisor.D、Majorrevisions
A、Learningfromthemistakes.B、Alwaystryingtofindoutthethings.C、Keepinghighspiritsevenafterhefails.D、Havingapec
Wehumansaren’ttheonlyoneswhowanttofitin.Researchershavediscoveredthatchimpanzees,too,preferentiallyadopttheir
A、Themandoesn’tliketotakethewomantotheparty.B、Thewomanishisfirstchoice.C、Themanwouldliketotakeanywomant
A、Criminals.B、Honestpeople.C、Peoplewhoareneitherhonestnorcriminals.D、Peoplewhoarebothcriminalsandliars.C
A、Exercisingtheentirebody.B、Havingyourbloodpressuretakendaily.C、Losingweightpriortoexercising.D、Weighinginbefor
NEWYORK--Everysooften,lateatnight,DavidWoodlandstealsawaytothedenofhishomeinAberdeen,Washington,sothathec
随机试题
箱形梁主要用于同时受到水平和垂直弯矩或扭矩作用时的工作状况。()
左心室增大可呈现以下X线征象,但除外
下列属于带下过多的病机是
下列属于柔性防水施工的有()。
塑料制个人用烟盒
若两个不同公司的甲车和乙车在行驶中发生相撞。甲车车辆损失5000元,车上货物损失10000元,乙车车辆损失4000元,车上货物损失5000元。交通管理部门裁定甲车负主要责任,承担经济损失70%;乙车负次要责任,承担经济损失30%。这两辆车都投保了车辆损失险
采用标准法计量操作风险监管资本时,公司金融这类业务条线的操作风险资本要求系数β为()。
下列不属于《义务教育化学课程标准(2011年版)》规定的基础学生实验的是()。
不等式(1-|x|)(1+x)>0成立。(1)|x|<1(2)r<-1
若有以下程序typedefstructstu{charname[10],gender;intscore;)STU;voidf(char*P){strcpy(P,"Qian");}main(){STUa={"Zhao
最新回复
(
0
)