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
2024-01-30
4
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/3407925.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
CanDigitalTextbooksTrulyReplacethePrintKind?Theshortcom
某电池生产企业对其生产的A、B、C三种电池的生产工序能力进行评估。经随机抽样并计
要了解一组数据分布的离散程度,可以用()衡量。A.分位数 B.方差 C.中
茶艺是一种综合性的生活艺术,但对于“茶艺”的____诠释究竟是什么却众说纷纭,即
以下关于宪法历史发展的论述正确的有( ) ?A、美国1789年宪法世界上第一部
(300+301+302+…+397)-(100+101+…+197)=( )
患者女,40岁,下唇反复糜烂、出血、结痂1年。活检标本见上皮表面过度正角化,粒层
标准履约担保格式中,担保人承诺“在本担保有效期内,因承包人违反合同约定的义务给你
(2018年真题)某商业公司非常重视安全文化建设,在安全文化建设方面投入了大量的
工程管理信息化有利于提高建设工程项目的经济效益和社会效益,以达到()的目的。A.
最新回复
(
0
)