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
60
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] The example of dogs and cats in the second paragraph is intended to _____.
选项
A、explain which animals are mammals
B、show the differences between mammals
C、illustrate how shallow dreamless sleep is
D、reveal how smart they are
答案
C
解析
这个例子是为了证明无梦睡眠比较浅,即第2第3句的前半句,所以选C比较合适。所有例子都是为之前或之后的话提供例证,因此,作者使用例子的目的可以从该例子之前或之后的一句话找到。本题中,猫和狗的例子是为了说明其前面的一句话,其他选项与此无关,均可排除。
转载请注明原文地址:https://tihaiku.com/zcyy/3414615.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
HowtoGetaGreatIdeaTheguestshadarrived,
【教学过程】 环节一:课堂导入 设置讨论活动,导入新课 在学习中,肯定有许多快乐的瞬间,也会有许多苦恼的时刻,请同学们谈谈自己学习中所遇到的苦与乐。
高校教师的职业劳动在形式上具有的特点是()。A.组织性 B.自主性 C.个
采用成本法评估资产的前提条件包括( )。A.评估对象能正常使用或者在用 B.
A.猩红热 B.水痘 C.风疹 D.幼儿急疹 E.麻疹可并发肾炎的是
在孕期,肠道对一些营养素,如铁、钙等的吸收量增加。( )
下列关于铁路在城市中布局的表述,错误的是( )A.铁路客运站布局要考虑旅客中转
适用于工程和货物的采购,尤其适用于后期使用成本对采购决策起关键作用的工程和货物采
2011年10月,中国人民银行再次修订货币供应量口径,新计入M2的项目有()。
关于掌深部间隙感染的处理原则,错误的是( )。A.切口常选在手背肿胀明显处
最新回复
(
0
)