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
外语
Sleep is part of a person’ s daily activity cycle. There are several different stages of sleep, and they too occur in cycles. If
Sleep is part of a person’ s daily activity cycle. There are several different stages of sleep, and they too occur in cycles. If
admin
2012-09-19
62
问题
Sleep is part of a person’ s daily activity cycle. There are several different stages of sleep, and they too occur in cycles. If you are an average sleeper, your sleep cycle is as follows. When you first drift off into slumber (安睡) , your eyes will roll about a bit, your temperature will drop slightly, your muscles will relax, and your breathing were slow and become quite regular. Your brain waves slow down a bit too, with the alpha rhythm of rather fast waves predominating for the first few minutes. This is called stage 1 sleep. For the next half hour or so, as you relax more and more, you will drift down through stage 2 and stage 3 sleep. The lower your stage of sleep, the slower your brain waves will be. Then about 40 to 60 minutes ’after you lose consciousness you will have reached the deepest sleep of all. Your brain waves will show the large slow waves that are known as the delta rhythm. This is stage 4 sleep.
You do not remain at this deep fourth stage all night long, hut instead about 80 minutes after you fall into slumber, your brain activity level will increase again slightly. The delta rhythm will disappear, to be replaced by the activity pattern of brain waves. Your eyes will begin to dart around under your closed eyelids (眼皮) as if you were looking at something occurring in front of you. This period of rapid eye movement lasts for some 8 to 15 minutes and is called REM sleep. It is during REM sleep period, your body will soon relax again, your breathing will grow slow and regular once more, and you will slip gently back from stage 1 to stage 4 sleep -- only to rise once again to the surface of near consciousness some 80 minutes later.
The stages of sleep take on______.
选项
A、an irregular aspect
B、a regular aspect
C、a punctual aspect
D、a similar aspect
答案
B
解析
答案B。文章的第二句告诉我们睡眠的不同阶段是周期性发生的,故睡眠的各阶段呈现规则的一面。
转载请注明原文地址:https://kaotiyun.com/show/6S57777K
0
大学英语四级
相关试题推荐
Onedayapoliceofficermanagedtogetsomefreshmushrooms.Hewasso【C1】______whathehadboughtthatheofferedto【C2】______
Forthispart,youareallowed30minutestowriteacampaignspeechinsupportofyourelectiontothepostofchairmanofthe
Internetuseappearstocauseadeclineinpsychologicalwell-being,accordingtoresearchatCarnegieMellonUniversity.Ev
Careerplanningdoesnotnecessarilyfollowroutineorlogicalsteps.Eachofusplacesweightondifferentfactorsandmaycons
A、Anxiety.B、Truth.C、Sympathy.D、Time.A从“worried”,“can’tsleep”,“anxiety”,“stress”这些意思接近的关键词不难推断,这段对话的主题是焦虑。因此选A。
A、Savetimebyusingacomputer.B、Buyherowncomputer.C、BorrowMartha’scomputer.D、Stayhomeandcompleteherpaper.B推理判断。
A、Moststudentswouldliketoworkforanewspaper.B、Moststudentsfindajobbyreadingadvertisements.C、Moststudentsfindi
Acollegelibraryisaninexhaustibleandeverchangingstorehouseofinformation.Newbooks,periodicals,andother【67】ofinfor
The811billionself-helpindustryisbuiltontheideathatyoushouldturnnegativethoughtslike"Ineverdoanythingright"
随机试题
关于DSA造影设定对比剂上升速率的叙述,错误的是
急性白血病患者继发感染最常见的病原体是
A.羌活B.苍耳子C.辛夷D.藁本E.白芷善治巅顶头痛的药物是()
社会主义法治把公平正义作为一切法治实践活动的价值追求。下列哪一说法正确体现了公平正义理念的基本要求?
关于土地价格,说法正确的有()。
乙公司在与国外某客户交易的过程中,约定三个月后该客户足额支付货款300万美元。三个月到期后,该客户表示公司缺乏资金,暂时无法支付货款,希望拖后两个月。在此期间,该客户突然宣布破产,乙公司只收回100万美元。整个过程中,美元一直处于贬值过程中,给乙公司带来了
在德育实施过程中,首先要尊重幼儿的人格和自尊心。
2006年9月,董某到某银行取款时,意外发现自己的银行卡里多了50万元存款。经查,是银行误将一个与董某同名同姓人的存款存入董某的卡里。此种情形可构成()。
计算机网络最突出的优点是()。
PASSAGETWO
最新回复
(
0
)