首页
登录
职称英语
All animals must rest, but do they really sleep as we know it? The answer to
All animals must rest, but do they really sleep as we know it? The answer to
游客
2025-03-30
19
管理
问题
All animals must rest, but do they really sleep as we know it? The answer to this question seems obvious. If an animal regularly stops its activities and stays quiet and un-moving—if it looks as though it is sleeping—then why not simply assume that it is in fact sleeping? But how can observers be sure that an animal is sleeping?
They can watch the animal and notice whether its eyes are open or closed, whether it is active or lying quietly, and whether it responds to light or sound. These factors are important clues, but they often are not enough. Horses and cows, for example, rarely close their eyes, and fish and snakes cannot close them. Yet this does not necessarily mean that they do not sleep. Have you ever seen a cat dozing with an eye partly open? Even humans have occasionally been observed to sleep with one or both eyes partially open. Animals do not necessarily lie down to sleep either. Elephants, for example, often sleep standing up, with their tusks resting in the fork of a tree. Finally, while "sleeping" animals often seem unaware of changes in the sounds and light and other stimuli around them, that does not really prove they are sleeping either.
Observations of animal behavior alone cannot fully answer the question of whether or not animals sleep. The answers come from doing experiments in sleep laboratories, using a machine called the electroencephalograph(EEC). The machine is connected to animals and measures their brain signals, breathing, heartbeat, and muscle activity. The measurements are different when the animals appear to be sleeping than when they appear to be awake. Using the EEC, scientists have confirmed that all birds and mammals studied in laboratories do sleep. There is some evidence that reptiles, such as snakes and turtles, do not truly sleep, although they do have periods of rest each day, in which they are quiet and unmoving. They also have discovered that some animals, like chimpanzees, cats, and moles(who live underground), are good sleepers while others, like sheep, goats, and donkeys, are poor sleepers. Interestingly, the good sleepers are nearly all hunters with resting places that are safe from their enemies. Nearly all the poor sleepers are animals hunted by other animals: they must always be watching for enemies, even when they are resting. [br] According to the research findings mentioned in the passage, reptiles______.
选项
A、such as turtles and snakes cannot close their eyes
B、cannot be studied with an EEC
C、do not sleep in the true sense of word
D、do not need to rest
答案
C
解析
本题的依据句是第三段中的“do not truly sleep”。
转载请注明原文地址:https://tihaiku.com/zcyy/4018341.html
相关试题推荐
Allanimalsmustrest,butdotheyreallysleepasweknowit?Theanswerto
Allanimalsmustrest,butdotheyreallysleepasweknowit?Theanswerto
Allanimalsmustrest,butdotheyreallysleepasweknowit?Theanswerto
Allanimalsmustrest,butdotheyreallysleepasweknowit?Theanswerto
Theevolutionofsexratioshasproduced,inmostplantsandanimalswithse
HisanswerwassoconfusedthatIcouldhardlymakeany______ofitatall.A、exp
Colorisveryimportanttomostanimalsforithelpsthemtogetalonginth
Colorisveryimportanttomostanimalsforithelpsthemtogetalonginth
Colorisveryimportanttomostanimalsforithelpsthemtogetalonginth
Colorisveryimportanttomostanimalsforithelpsthemtogetalonginth
随机试题
[originaltext]Whatcolordoyoulike?[/originaltext][audioFiles]2021m12x/audio
Themomentumisbuildingaheadofnextmonth’sG8summitinScotlandwheret
It’sa(47)______oftenrequestedinlonelyheartsadsandscientistshaven
采用工程量清单计价,建设工程造价由下列何者组成?Ⅰ.分部分项工程费;Ⅱ.措施项目
下列关于食品添加剂的说法,错误的是A.食品添加剂应当有标签、说明书和包装 B.
()能使教师及时了解学生在该阶段的音乐学习情况,及时反馈教学信息,发现学生音
A.朱砂B.石菖蒲C.柏子仁D.合欢皮E.首乌藤有疏肝解郁、宁心安神功效的药物是
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
单位支取定期存款只能以转账方式将存款转入其()账户。A.一般存款
关于无效合同,说法正确的是()。A.造成对方人身伤害的免责条款无效 B.
最新回复
(
0
)