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
自考
Evolution of Sleep Sleep is very ancient. In the electroencephalographic (脑电图仪的) sense we share it with all the primates(灵长类
Evolution of Sleep Sleep is very ancient. In the electroencephalographic (脑电图仪的) sense we share it with all the primates(灵长类
admin
2017-04-24
51
问题
Evolution of Sleep
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, the function of sleep is to decrease it? Wilse Webb of the University of Florida and Ray Meddis of London University have suggested this to be the case. It is conceivable that animals who are too stupid to be quiet 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.
It can be inferred from the passage that animals that are prey rarely experience dream sleep because they______.
选项
A、have evolved further than predators
B、are particularly intelligent animals
C、need less sleep than predators
D、would be caught if deeply asleep
答案
D
解析
射推理判断题。文章在第二段中交代,在做梦的睡眠中,动物是一动不动的,对外界刺激毫无反应,这样的情况对被捕食的动物很危险,因为它们如果睡得很死,就有可能被食肉动物吃掉。所以我们可以推断,这些动物睡觉时很少做梦,因为熟睡会被别的动物逮住。
转载请注明原文地址:https://kaotiyun.com/show/D18R777K
本试题收录于:
英语(二)题库公共课分类
0
英语(二)
公共课
相关试题推荐
简述通信系统的编码方式。
Anunderstandingofman’seffectonthebalanceofnatureiscrucial(关键的)tobeingabletofindtheappropriateremedialaction.
Thethreatofaglobaloutbreak(疾病大爆发)ofbirdflumakesiturgentfortheinternationalcommunitytocooperateeffectively.Weal
Thethreatofaglobaloutbreak(疾病大爆发)ofbirdflumakesiturgentfortheinternationalcommunitytocooperateeffectively.Weal
Oneofthemostexcitingraceseverrunisnowinprogressbetweendoctorsfightingmalaria(疟疾)andmosquitoes.Accordingtothe
Manyteachersbelievethattheresponsibilityforlearninglieswiththestudents.Ifalongreadingassignmentisgiven,instruc
HowLongCanaHumanSurviveWithoutWaterandFood?Peopledonotneedfoodasmuchastheydowater.Infact,theycansur
BritishColumbiaBritishColumbiaisthethirdlargestCanadianprovince,bothinareaandpopulation.Itisnearly1.5time
EvolutionofSleepSleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshareitwithalltheprimates(灵长类
RareFossilRecordThepreservationofembryosandjuvenilesisarareoccurrenceinthefossilrecord.Thetiny,delicates
随机试题
与血友病A有关的凝血因子是
颈动脉鞘内不含有
平肝降逆宜生用,止血宜煅用的药物是
哮喘急性发作早期动脉血气分析最常见的表现是( )。【2004年考试真题】
作为项目现金流量表中运营期现金流出的主体部分,经营成本等于总成本费用减去()。
会员制期货交易所召开会员大会,应当将会议审议的事项于会议召开( )日前通知会员。
利用栈求表达式的值时,设立运算数栈S。假设栈S只有两个存储单元,在下列表达式中,不发生溢出的是()。
Doyouknowhowtouseamobilephone(手机)withoutbeingrudetothepeoplearoundyou?Talkingduringaperformanceirritat
对偷盗婴幼儿的行为以绑架罪论处,必须是行为人()。
Doesthelanguagewespeakdeterminehowhealthyandrichwewillbe?NewresearchbyKeithChenofYaleBusinessSchoolsuggest
最新回复
(
0
)