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
2024-01-29
66
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:http://tihaiku.com/zcyy/3404790.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
Anenlargedprostatemay______thebladderandpinchofftheurethra,causingp
Hadhebeenworkingthereformanyyears,theauthorofthereport____________(会
A.publishedB.demonstrateC.cutoffD.studied
1925年,德国工业同盟在斯图加特附近的威森豪夫组织的建筑大展体现了现代主义建筑
生品有止痛作用,但有效成分不易煎出,所以止痛效果欠佳,故临床多用醋制品的是A.香
建设单位应当将大型的人员密集场所和其他特殊建筑工程的消防设计文件报送公安机关消防
小李,甲市户籍,受聘乙市某企业做电焊工,被派往该企业驻丙市项目多年,期间与丁市
茉莉花香扑鼻而来,村屯道路干净整洁,一派山水田园风光——这是H县石井村的新景象。
根据动作对环境的依赖程度不同,可将操作技能分为闭合性操作技能与()操作技
A.巯乙胺 B.亚甲蓝 C.二巯基丙磺酸钠 D.阿托品 E.青霉胺苯胺中
最新回复
(
0
)