首页
登录
职称英语
What is the passage mainly concerned about? [originaltext] Sleep is very an
What is the passage mainly concerned about? [originaltext] Sleep is very an
游客
2023-11-07
71
管理
问题
What is the passage mainly concerned about?
Sleep is very ancient. In the electroencephalographic sense we share it with all the primates and almost all the other mammals and birds: it may extend back as far as the reptiles.
There is some evidence that the two types of sleep, dreaming and dreamless, depend on the life-style of the animal, and that predators 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 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.
选项
A、The difference between dream and dreamless sleep of human beings.
B、Why animals with distinctive life style sleep differently.
C、Deep dream sleep of predators.
D、Stupid animals and smart animals.
答案
B
解析
转载请注明原文地址:http://tihaiku.com/zcyy/3165148.html
相关试题推荐
Whowastheonlypersonhavingsurvivedthecrash?[br][originaltext]TheF
Whowastheonlypersonhavingsurvivedthecrash?[originaltext]TheFrench
Howmanypeoplehavebeenestimatedtobedeadintheconflict?[originaltext]
What’stheresultofstrike?[br][originaltext]Atleast40peopleinBangla
What’stheresultofstrike?[originaltext]Atleast40peopleinBangladeshh
Anothertermforidenticaltwinsis__________.[br][originaltext]Although
Anothertermforidenticaltwinsis__________.[br][originaltext]Although
Anothertermforidenticaltwinsis__________.[br][originaltext]Although
Anothertermforidenticaltwinsis__________.[originaltext]Althoughtwins
ThepurposeofMagellan’sexpeditionwas______.[originaltext]Earlyinthe
随机试题
Whycan’tthemantellthewomanwhatthepresentis?[br][originaltext]W:Id
Onelunchtime,MayWardwasdoinghershoppinginalocalsupermarket,when
Tencatsinsearchofownerswillspendthenext10daysinaNewYorkstore
土地使用权出让有条件的必须采取拍卖、招标方式,下列哪类用地适用上述方式?()
《齐民要术》是中国现存最早最完整的农书,编著者是()。A.贾思勰 B.王祯
某上市公司拟在未来无限时期每年支付每股股利2元,相应的贴现率(必要收益率)为10
参加证券业从业人员资格考试的人员。违反考试规则,扰乱考场秩序的,() 年内不
体内药物分析最常用的检测方法不包括A.HPLC法 B.酶免疫分析法 C.毛细
证券公司经营证券承销与保荐、证券自营、证券资产管理、其他证券业务等业务之一的,其
A.谷类和薯类食物 B.动物肉类食物 C.蔬菜水果类食物 D.奶类和豆制品
最新回复
(
0
)