首页
登录
职称英语
Sleep is very ancient. In the electroencephalographic (脑电图仪的) sense we share
Sleep is very ancient. In the electroencephalographic (脑电图仪的) sense we share
游客
2024-02-02
28
管理
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. [br] 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://tihaiku.com/zcyy/3414614.html
相关试题推荐
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshare
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshare
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshare
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshare
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshare
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshare
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshare
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshare
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshare
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)senseweshare
随机试题
Inthesummerof2010,record-hightemperatureshitMoscow.Atfirstitwasj
Airpollutionisoneofthemostpervasiveenvironmentalproblemsbecauseat
ForgetexpensiveeducationalDVDsandprivatetutors,thesecrettosmartch
arcsinx+C
下面哪两个指标具有相同的经济意义,可以相互补充( ).A.资产负债率与产权比率
2001年、2002年全国高等学校各学科学生数(单位:千人) 2001年
A.还原型谷胱甘肽 B.多烯磷脂酰胆碱 C.异甘草酸镁 D.双环醇 E.
下列各项中,可以作为胶浆剂的是()。A.桂皮糖浆 B.山梨醇 C.羧甲
下列关于债券价值与折现率的说法中,正确的有()。A.报价利率除以一年内复利
甲公司向乙公司签发一张纸质商业承兑汇票,完成承兑后下列关于该汇票办理票据信息登记
最新回复
(
0
)