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
2023-07-15
65
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, 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. [br] According to some scientists’ research findings, dolphins seldom sleep because______.
选项
A、of their stupidity
B、of their vulnerability
C、there are possible dangers in the ocean
D、aquatic mammals do not need sleep
答案
C
解析
最后一段第2句解释了第1句中所说的“海豚等睡眠少”的原因,C比较确切地反映了文章内容。A、B、D三项都与最后一段开头两句表达的意思无关。
转载请注明原文地址:https://tihaiku.com/zcyy/2838016.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)sensewesharei
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)sensewesharei
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)sensewesharei
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)sensewesharei
Sleepisveryancient.Intheelectroencephalographic(脑电图仪的)sensewesharei
随机试题
中国人民银行资产负债表中的会计科目包括( )。 Ⅰ.资产项目 Ⅱ.财政存款
高血压伴前列腺增生患者适宜选用的降压药有A、多沙唑嗪 B、贝那普利 C、硝普
培训前沟通的主要内容不包括( )。A.培训期间要完成的任务 B.学员在哪些方
(2015年11月)辩证思维在创新中的作用包括( )A.突破作用 B.统帅作
下列不属于加热炉噪声控制措施的是()。A.放散阀增加消声器 B.加强机械通
2016-49.根据《中华人民共和国固体废物污染环境防治法》,关于生活垃圾处置设
某道路工程项目,施工总承包单位项目经理部根据该工程作业内容、土质条件,运距和气象
安装单位应当在履行告知后、开始施工前,向规定的检验机构申请监督检验。待检验机构(
兴奋性是指A.机体或组织对刺激发生应激的特性 B.机体或组织对刺激发生反应的特
慢性肺脓肿较急性肺脓肿更为常见的体征是A.肺部闻及支气管呼吸音 B.肺部叩诊呈
最新回复
(
0
)