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
2017-11-17
131
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
根据第2段第1句第4个分句可知应选B。A的内容与该段第2句相悖;C中dreamless sleep应为dream sleep。D的内容文中没有涉及。
转载请注明原文地址:https://kaotiyun.com/show/aPa7777K
0
大学英语四级
相关试题推荐
FederalExpressisacompanythatspecializesinrapidovernightdeliveryofhigh-prioritypackages.Thefirstcompanyofitsty
TheUSCongressA)TheUScongressisthelegislativebranchofthefederalgovernment.Itisabicameral(两院制的)law-making
TheUSCongressA)TheUScongressisthelegislativebranchofthefederalgovernment.Itisabicameral(两院制的)law-making
TheUSCongressA)TheUScongressisthelegislativebranchofthefederalgovernment.Itisabicameral(两院制的)law-making
AstrologyA)Astrologyisthestudyofhowthesun,themoon,planets,andstarsaresupposedlyrelatedtolifeandeventso
WorkingtoImprovetheConditionsofEvergladesNationalParkA)WhenmanypeoplethinkofFlorida,imagesofsandycoastlin
Juicemaybetasty,butit’snotreallythatnourishing.Whileorangejuiceisan【B1】_____sourceofvitaminC,itdoesn’tconta
Juicemaybetasty,butit’snotreallythatnourishing.Whileorangejuiceisan【B1】_____sourceofvitaminC,itdoesn’tconta
A、TogiveSarahanexceptionalexample.B、Tosupporthisideathatwomenblushmorethanmen.C、TointroduceBriantoSarah.D、T
TheEarthcomprisesthreeprincipallayers:thedense,iron-richcore,themantlemadeofsilicate(硅酸盐)thataresemi-moltenatd
随机试题
“茶之初,姓本蜀。”四川是中华茶文化的发源地,也是“茶马古道”的起点之一,在古代承担着茶叶入藏和藏马入川的重任。“山间铃响茶香来”,生动地描写了当时川藏“茶马互市”的景象。“一春心事在新茶”,对于嗜茶者,莫不以春茶为贵,而四川因其得天独厚的自然条件。成为我
苏轼词的主要风格特征是()
患儿男性,5岁,因“发热、面色苍白20天”入院。患儿于20天前不明原因发热,体温38℃左右,伴面色苍白,无咳嗽、呕吐、腹泻等,自服退热药物症状无好转。查体:体温38.8℃,脉搏132次/min,呼吸32次/min,血压100/70mmHg。一般状况尚可,重
轻型口疮的症状特点是
A.直方图B.直条图C.线图D.圆形图E.散点图表示某地1995年5种不同类型病毒性肝炎发病人数占病毒性肝炎发病总人数的比重,宜采用
土方边坡坡度大小与( )无关。
1.背景材料:公路工程设计变更,指工程初步设计批准之日起至竣工验收正式交付使用之日止,对已批准的初步设计文件、技术设计文件或施工图设计文件所进行的修改、完善等活动。为加强公路工程建设管理,规范公路工程设计变更行为,保证公路工程质量,保护
海关的行政强制权具体包括()。
如果一个竞争行业中的企业获得了经济利润,就会有新企业加入,这将使()。
A、Helpingthekidsoutoffinancialdifficulties.B、Gettingprecioustutoringexperience.C、Earningsomemoneyforthenextterm
最新回复
(
0
)