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
2013-04-06
33
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, rattier 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时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://jikaoti.com/ti/OSVFFFFM
0
大学英语四级
相关试题推荐
Forthispart,youareallowed30minutestowriteacompositiononthetopic:SalaryorInterest.Youshouldwriteatleast12
Thegoldenruleyourparentsandteacherstaughtyouwasprettysimple:Dountoothersasyou’dhaveothersdountoyou.Imagine
A、Todeterminewhether-or-nottheyshould.B、Toprocessslowlyandwithcaution.C、Tohaveamusclecheck.D、Toincreaseheartr
Chicago:SomeBigPlacestoSeeinthe"CityoftheBigShoulders"Earlylastcentury,thepoetCarlSandburgdescribedChic
LudwigvanBeethovenwasoneofthegreatest【B1】______whoeverlived.Hethoughtthatpeoplecouldbefreewhentheywrotemus
A、Hedoesn’texpecttomeetherattheseashore.B、Hewantstoknowwhenshe’scoming.C、Hewantstoseehowherexperimentisp
A、Teaishatterthancoffee.B、Themanshouldswitchtotea.C、Therearetworeasonsfornotdrinkingcoffee.D、Themanshouldn’
ChinaiscastingsuchahugeshadowontheUnitedStatesthatmanyAmericansaretryinghardtolearntheChineselanguagewith
Forthispart,youareallowed30minutestowriteacompositiononthetitleGlobalWarming.Youshouldwriteatleast120word
A、17,000.B、1,700.C、70,006.D、7,000.D信息明示题,文章提到Lastyear,coastGuardsmensavedthelivesofalmost7,000people,所以D正确
随机试题
按摩师在引导宾客时,正确的指示做法是()。
A.大补元煎B.滋水清肝饮C.生脉饮D.二阴煎E.左归丸肺癌气阴两虚型宜选用
A.疝在腹股沟韧带下方,常发生绞窄B.疝内容物常可还纳,可发生绞窄C.疝内容物不易还纳,内脏构成部分疝囊壁D.疝内容不进人阴囊,绞窄少见E.咳嗽时无冲击感,肿块随睾丸牵拉而活动腹股沟直疝的f临床表现为
组成药物中含有熟地黄、肉桂的方剂是()
用水泥砂浆抹灰时,应在前一层抹灰( ),方可抹后一层。
该网络计划中哪些工作是主要控制对象(关键工作),计划工期是多少?针对上述每一事件,分别简述乙方能否向甲方提出工期及费用索赔的理由。
企业业务预算的内容包括()。
下列属于非法人组织的有()。
下列财政补贴中,属于流通环节补贴的有()。(2009年多选题)
C语言中允许用外部说明来指定变量、函数和其他标识符的特征,这里所说的外部指的是()。
最新回复
(
0
)