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
28
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.
In the second paragraph the word "dart" means ______.
选项
A、glare
B、move rapidly or suddenly
C、stop moving
D、gaze
答案
B
解析
dart的后文说“眼睛好像看着发牛在眼前的事”,又说“这种快速移动眼睛的阶段叫REM sleep”,据此可知dart意为move quickly or suddenly (飞快地移动)。glare 怒目而视;gaze凝视。
转载请注明原文地址:https://kaotiyun.com/show/bS57777K
0
大学英语四级
相关试题推荐
AgriculturalNewsFoodandAgricultureinTwenty-fiveYearsAccordingtotheInternationalFoodPolicyResearchInstitute,t
A、Becauseitcanhelpyouincaseyoudon’tknowwhattosaytoothers.B、Becausemanypartiesaskpeopletodothis.C、Because
Internetuseappearstocauseadeclineinpsychologicalwell-being,accordingtoresearchatCarnegieMellonUniversity.Ev
A、11yearsB、16yearsC、26yearsD、21yearsD内容与资金有关,因为资金不足,所以美国名人才写信募捐,MarkTwain的信上说女神小姐不值得拥有一座塑像当然是取笑,其他选项文中没有提到。
IntheearlydaysoftheUnitedStates,postalchargeswerepaidbytherecipientandChargesvariedwiththedistancecarried.
A、Itisgoodfordigestion.B、Ithelpsstrengthentheheart.C、Itdevelopsmentaltoughness.D、Itisgoodforimprovingmuscles.
A、Savetimebyusingacomputer.B、Buyherowncomputer.C、BorrowMartha’scomputer.D、Stayhomeandcompleteherpaper.B推理判断。
NelsonMandelawasstillinjailwhenthefirststreetwasnamed【67】him.BythetimeheretiredasPresidentofSouthAfrica,hu
A、Thebikeisexpensive.B、Thetiresaregoodbutnothingelse.C、Thebikeisbroken.D、Thebikeisworthwhile.D男士三十美元买了一辆二手自行车
Newtechnologylinkstheworldasneverbefore.Ourplanethasshrunk.It’snowa"globalvillage"wherecountriesareonlyseco
随机试题
丹毒的致病菌是【】
男,74岁,发现血压高20余年,胸闷、气短2年,诊断为高血压心脏病,1小时前情绪激动后出现上述症状加重,咯粉红色泡沫状痰。查体:血压190/100mmHg,端坐呼吸,心界向左下扩大,心率110次/分,双肺底湿性啰音,下肢无水肿该患者目前的诊断为
影响计算机图像质量的主要参数有:
大额可转让定期存单最早产生于美国。美国的《Q条例》规定,商业银行对活期存款不能支付利息,定期存款不能突破一定限额。20世纪60年代,美国市场利率上涨,高于《Q条例》规定的上限,资金从商业银行流入金融市场。为了吸引客户,商业银行推出可转让大额定期存单。购买存
Theword“day”hastwomeanings.Whenwetalkaboutthenumberofdaysinayear,weareusing“day”tomean24hours.Butwhenwetalk
海上货物运输保险的附加险别包括()。
奥苏贝尔依据学习进行的方式把学习分为()。
请对“由于意志以外的原因导致犯罪没有完成的为犯罪未遂”进行辨析。
0.96875
Despiteyourbestintentionsandefforts,itis【C1】______:Atsomepointinyourlife,youwillbewrong.【C2】_______canbehar
最新回复
(
0
)