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
自考
Evolution of Sleep Sleep is very ancient. In the electroencephalographic (脑电图仪的) sense we share it with all the primates(灵长类
Evolution of Sleep Sleep is very ancient. In the electroencephalographic (脑电图仪的) sense we share it with all the primates(灵长类
admin
2017-04-24
127
问题
Evolution of Sleep
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, the function of sleep is to decrease it? Wilse Webb of the University of Florida and Ray Meddis of London University have suggested this to be the case. It is conceivable that animals who are too stupid to be quiet 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.
The passage is mainly concerned with the______.
选项
A、types and function of sleep
B、psychological role of dreams
C、history of reptilian sleep patterns
D、influence of evolution on young animals
答案
A
解析
推理判断题。本文第一段指出睡眠是非常古老的现象,第二段一开始就提出睡眠的种类,第三段则提出它的原始功能。三个段落都从不同角度讨论睡眠,因而不包含sleep这个词的选项B和D可以排除。选项C虽然有sleep,但本文占较大篇幅的二、三两段均未涉及爬行动物睡眠形式的历史,因此可以排除。
转载请注明原文地址:https://kaotiyun.com/show/P18R777K
本试题收录于:
英语(二)题库公共课分类
0
英语(二)
公共课
相关试题推荐
Weallknowthathumansaredamagingtheenvironment,butwhatcanwedoaboutit?Somepeoplearetryingtodotheirbittobemo
InBritain,______thepublicschools,thereisacompletesystemofstateprimaryandsecondaryeducation.
Marywasseriouslyill,sowearranged______bythebestdoctors.
IncomeIncomemaybenationalincomeandpersonalincome.Whereasnationalincomeisdefinedasthetotalearnedincomeofa
SpiritualBondBesides,donotforgettoappreciatethe"spiritualbond"betweenpeople.I’vemetnumerouspeopleinJapan,
HowLongCanaHumanSurviveWithoutWaterandFood?Peopledonotneedfoodasmuchastheydowater.Infact,theycansur
BritishColumbiaBritishColumbiaisthethirdlargestCanadianprovince,bothinareaandpopulation.Itisnearly1.5time
TheCaffeineHabitTherearemorethan170milliondrugaddictsintheU.S.,andthestrangethingisthatyoucanbecoun
A.arecurrentthemeB.tokeepaheadofscientificadvancesC.readingbooksofsciencefictionD.politicalimplicationsE.a
KareFossilRecordThepreservationofembryosandjuvenilesisarareoccurrenceinthefossilrecord.Thetiny,delicatesk
随机试题
胆囊中胆汁浓缩后胆固醇沉淀析出形成胆结石,其原因有
女性,35岁。双眼睑下垂6个月来就诊。近日出现四肢无力,吞咽困难。无发热,无腹泻。胸部CT提示:胸腺增生。收住入院当日出现口唇发绀,呼吸急促。此例病人可明确诊断最简便的手段的是
识别染色体的重要标志不包括
劳动者非因本人原因从原用人单位被安排到新用人单位工作,原用人单位未支付经济补偿,现新用人单位向劳动者提出解除、终止劳动合同,在计算支付经济补偿或赔偿金的工作年限时,劳动者请求把在原用人单位的工作年限合并计算为新用人单位工作年限的,下列哪些情形人民法院应予支
某4层钢结构商业建筑,层高5m,房屋高度20m,抗震设防烈度8度,采用框架结构,布置如图24—28(Z)所示。框架梁柱采用Q345。框架梁截面采用轧制型钢H600×200×11×17,柱采用箱形截面B450×450×16。梁柱截面特性如下:假定,次
原始凭证发生的错误,正确的更正方法是由出具单位在原始凭证上更正。()
符合()情形之一的货物或服务,可以采用单一来源方式采购。
企业董事会或者经理办公会主要拟订预算的目标、政策,制定预算管理的具体措施和办法。()
幼儿正确辨认颜色的百分率,不会因年龄班级不同、颜色不同、辨认方式不同而有差异。()
在考生文件夹下,打开文档Wordl.docx,按照要求完成下列操作并以该文件名Word1.docx保存文档。设置正文各段落(“东湖位于……留连往返。")段后间距为0.5行,各段首字下沉2行(距正文0.2厘米);在页面底端(页脚)按“普通数字3”样式插入
最新回复
(
0
)