首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
考研
All animals must rest, but do they really sleep as we know it? The answer to this question seems obvious. If an animal regularly
All animals must rest, but do they really sleep as we know it? The answer to this question seems obvious. If an animal regularly
admin
2014-06-13
32
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 unmoving—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.
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 the word
D、do not need to rest
答案
C
解析
答案C的意思与第三段中的do not truly sleep的意思完全吻合。
转载请注明原文地址:https://jikaoti.com/ti/LUYRFFFM
0
考研英语一
相关试题推荐
ReadthefollowingtextcarefullyandthentranslatetheunderlinedsegmentsintoChinese.Yourtranslationshouldbewrittencl
Accordingtotheauthor,theAmericaneconomicsituationis______.Theauthorraisesthequestion"whataboutpainwithoutgai
ThistextismainlyintendedtoTheauthorconcludesthatonlysharedmythscanhelpAmericans
Cats,accordingtotheauthor,______.Thepassageconcludesthat______.
Howdoestheauthorthinkofhimself?Bysaying"thenominalwinnerisoftenarealloser"(Paragraph2),theauthormeans
Itcouldbeinferredthatthewriterthinksthat,incomparisonwiththemovementofmillionsofhungryandjoblesspeoplefrom
Peopleinbusinesscanuseforesighttoidentifynewproductsandservices,aswellasmarketsforthoseproductsandservices.
Thefindingiscontrarytothecommonbeliefthatallpeoplearemotivatedtoalleviatenegativemoods,accordingtoJonathonBr
ThatLouiseNevelsonisbelievedbymanycriticstobethegreatesttwentieth-centurysculptorisallthemoreremarkablebecaus
Intherelationshipofeducationtobusinessweobservetodayafinestateofparadox.Ontheonehand,theemphasiswhichmost
随机试题
肝硬化病人引起肝肾综合征的因素中,下列哪项不正确
下列哪种并发症主要出现于骨折早期
A.发汗解表,通窍B.发汗解表,化湿和中,利水消肿C.发汗解表,消肿排脓D.祛风解表,透疹消疮,止血止痉E.发汗解表,胜湿止痛荆芥的功效是
开发区环境影响识别对重污染或大于( )规模的开发区,除考虑对区外环境的影响外,还应识别区外经济活动对区内的环境影响。
《中华人民共和国渔业法》规定,使用炸鱼、毒鱼、电鱼等破坏渔业资源方法进行捕捞的,违反关于禁渔区、禁渔期的规定进行捕捞的,或者使用禁用的渔具、捕捞方法和小于最小网目尺寸的网具进行捕捞或者渔获物中幼鱼超过规定比例的,没收渔获物和违法所得,处()的罚款
Sheandherhusbandareofthesame________;theybothwanttheirdaughtertogoabroadforfurthereducation.
2018年6月,习近平在山东考察时强调,我们党要永远立于不败之地,就要不断推进自我革命,教育引导党员、干部特别是领导干部从思想上正本清源、固本培元,筑牢思想道德防线,增强拒腐防变和抵御风险能力,时刻保持共产党人的政治本色。这一论断蕴含的哲学道理是(
论述辛亥革命推翻封建帝制是历史合力的结果。(南京大学2013年历史学基础(中国近现代史)真题)
ThereisgrowinginterestinEastJapanRailwayCo.ltd.,oneofthesixcompanies,createdoutoftheprivatizednationalrailw
(2010年下半年)Simple公司接到一栋大楼的布线任务,经过分析决定将大楼的四层布线任务分别交给甲、乙、丙、丁四个项目经理,每人负责一层布线任务,每层面积为10000平方米。布线任务由同一个施工队施工,该工程队有5个施工组。甲经过测算,预计每个施工组每
最新回复
(
0
)