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
2023-06-25
26
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/2780337.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
Atwhattimeofdaydidthefirestart?Intheearly______.[originaltext]N
[originaltext]W:I’msorryyoufailedthephysicscourse,Todd.M:Let’sfacei
下列哪一类工程(层高均为2.8m,室内外高差0.6m)可设一个安全出口?()
关于声速、波长、频率及其相互关系的描述,不正确的是A.单位时间内质点振动次数为频
A.局部红肿硬结,腋下淋巴结肿大 B.接种后6~10天产生轻微的麻疹样皮疹
A.相乘传变 B.母病及子 C.制化传变 D.子病犯母 E.相侮传变肝病
易侵犯下部的是( )。A.风邪 B.寒邪 C.暑邪 D.湿邪 E.燥邪
治疗肺胃出血,宜首选A.大蓟 B.白茅根 C.地榆 D.白芨 E.槐花
久置于空气中容易吸收二氧化碳而产生混浊或沉淀,最好在临用前配制的药物是A:盐酸氯
关于雨期路基施工的说法,错误的是()。A.每一填筑层表面应做成2%~4%单
最新回复
(
0
)