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(灵长动
Evolution of Sleep Sleep is very ancient. In the electroencephalographic (脑电图仪的) sense we share it with all the primates(灵长动
admin
2018-05-07
46
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(灵长动物的) 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.
The author states that during dream sleep, the animal sleeps______.
选项
A、without moving
B、shallowly
C、intermittently
D、on its side
答案
A
解析
求解本题的依据在第二段。“In dream sleep,the animal is powerfully immobilized and remarkably unresponsive to external stimuli.”在该句中我们可以找到关键词“immobilized”与“unresponsive”,它们实际上在此与“without moving”同义。而其他三个选择项的内容都与原文不符。
转载请注明原文地址:https://kaotiyun.com/show/CH8R777K
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
Weallknowthathumansaredamagingtheenvironment,butwhatcanwedoaboutit?Somepeoplearetryingtodotheirbittobemo
Onlinelearningisalsocalleddistanceeducation,whichhelpsstudentswhotakeclassesbycomputerovertheInternettolearnc
All______(participate)finishingtheracewillreceiveamedal(奖牌).
ThecowboyswholivedintheUnitedStatesofAmericabeforethereweregoodroadsorbigmoderncitiesusedtoliveonthehuge
Althoughmanagerscannotpredictthefuture,manyoftheirdecisionsrequirethatthey______(consider)possiblefutureevents.
PocketMoneyBasicsPocketmoneyisoneofthefirstwaysforchildrentolearnthebasicsof【C1】______(manage)money—askill
PocketMoneyBasicsPocketmoneyisoneofthefirstwaysforchildrentolearnthebasicsof【C1】______(manage)money—askill
EvolutionofSleepSleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshareitwithalltheprimates(灵长类
随机试题
多模光钎熔接时,是光纤()对准实现连接的。
A.目外眦B.鼻旁C.足大趾D.手小指E.足小趾
目前普遍采用的结核菌检查方法是
患者男性,77岁,8年来心悸、气短,活动时胸痛、头晕,2天来咽痛、低热。查体血压170/60mmHg,心界向左下扩大,主动脉瓣区闻及双期杂音,心尖部闻及舒张期隆隆样杂音,双肺底闻及少许湿啰音
厂房内设置甲、乙类中间仓库时,其储量不宜超过()的需要量。
作为银行面临的最主要风险,信用风险包含于()业务之中。
内部招聘在()情况下有效。
契约型基金相对于公司型基金的特点是()。
下列表述错误的是:
微分方程(y+x3)dx-2xdy=0满足y|x=1=6/5的特解。
最新回复
(
0
)