首页
登录
职称英语
Sleep is part of a person’ s daily activity cycle. There are several differe
Sleep is part of a person’ s daily activity cycle. There are several differe
游客
2024-02-19
99
管理
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. [br] 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://tihaiku.com/zcyy/3464141.html
相关试题推荐
[originaltext]TheUnitedStatesofAmericaisacountrymadeupofdifferen
Individualswillbe______fortheirownpersonaldevelopmentplanswhichwillb
Willthisshirt______inthewash?I’veboughtseveralshirtswhicharetoosma
Sincetherewerefivedifferent______oftheaccident,itwasdifficulttoknow
Modernmedicaladvances______theaveragelifeexpectancybyseveralyears.A、ex
Althoughtherearedifferentopinionsamongthem,theyfinally______aplan.A、a
Thetwothingsarethesameinoutwardformbutdifferent______.A、inappearance
Thebigdifferencebetweenthedrama______andtherealoneistheunpleasantp
Theoldaredrinking______milkperpersontodayastheydidadecadeago.A、asfi
Whatdeterminesthekindofpersonyouare?Whatfactorsmakeyoumoreorle
随机试题
ProductionoftheAmbassador,thefirstcartobemadeinIndia,hasbeenha
TheScienceofAnthropologyAThroughvariousmethodsof
resent,calm,obvious,indetail,resolve,satisfy,involve,prefer,al
[img]2018m1x/ct_eyyjsbz2017c_eyyjsbreada_0027_201712[/img]Gettingacoldor
[originaltext]W:Andwhendidyoubeginthissortofwork?M:Let’sseenow...u
节点③中,扶手顶端距踏步面的高度为()。 A.650~850mm B.
A.对理想流体,该测压管水头线(Hp线)应该沿程无变化 B.该图是理想流体流动
A.IgG B.IgM C.IgE D.SIgA E.IgD相对分子质量
关于类风湿因子(RF)正确的是A.RF是一种以IgG为靶抗原的自身抗体B.RF是
学校美育的任务是什么?
最新回复
(
0
)