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
2011-02-28
37
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, your eyes will roll about a bit, your temperature will drop, your muscles will relax, and your breathing will 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 I 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 along, but 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 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 that most dreams seem to occur.
Provided that you do not wake up during the first 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.
According to the passage, the alpha rhythm is the characteristic of which phase of sleep?
选项
A、Stage 1.
B、Stage 2.
C、Stage 3.
D、Stage 4.
答案
A
解析
在入睡的前几分钟,脑波活动较快,然后,脑波活动变慢,这称为睡眠的第一阶段。
转载请注明原文地址:https://kaotiyun.com/show/6Std777K
本试题收录于:
公共英语三级笔试题库公共英语(PETS)分类
0
公共英语三级笔试
公共英语(PETS)
相关试题推荐
WhatdoesthespeakersayabouttheroadbetweenMaineandQuebec?
AccordingtoPeterSalovey,YalepsychologistandauthorofthetermEQ,IQgetsyouhiredandEQgetsyoupromoted.Salovey
Amongtheraftofbooks,articles,jokes,romanticcomedies,self-helpguidesandotherwritingsdiscussingmarriage,somefamil
Amongtheraftofbooks,articles,jokes,romanticcomedies,self-helpguidesandotherwritingsdiscussingmarriage,somefamil
Howeverimportantwemayregardschoollifetobe,thereisnodenyingthefactthatchildrenspendmoretimeathomethaninth
MostofusAmericanshaveavague,uneasysenseofwickedwastefulness.Wethrowoutthenever-openedpackoffoodthat’spasti
NomanhasbeenmoreharshlyjudgedthanMachiavelli,especiallyinthetwocenturiesfollowinghisdeath.Buthehassincefoun
PaulJohnson’sHistoryOfTheAmericanPeopleiswhatwehavecometoexpectfromthisproductivewriter—clear,colorfulnarrati
Wheredoestheconversationmostprobablytakeplace?
Wheredoestheconversationmostprobablytakeplace?
随机试题
迄今为止,最古老、使用范围最广的课程类型是()
A、5年B、10年C、15年D、20年E、30年《医疗事故处理条例》规定,残疾生活补助费应根据伤残等级,自定残之月起赔偿
桥梁基坑开挖中,遇有流沙时,应采取围堰或打板桩支撑等防护措施。()
下列会计活动中,属于财务会计范畴的是()。
某大型食品生产企业2018年4月1日,经营租赁方式租入固定资产使用,租期1年,支付年租金12万元。当年企业计算应纳税所得额时应扣除的租赁费用为()万元。
一个对称三相负载,每相为4Ω电阻和3Ω感抗串联,星形接法,三相电源电压为380V,则线电流的大小I1为()。
如何应用销售百分比法预测资金需要量?
某企业拟购C公司股票并准备长期持有,预计该股票每年股利为1.5元,企业要求的必要收益率为10%,则该股票的价值为12元。()(浙江财经学院,2011)
设f(x)在[a,b]上有二阶连续导数,证明∫abf(x)dx=(b—a)[f(a)+f(b)]+∫abf"(x)(x一a)(x一b)dx
A、10:30PM.B、11:00PM.C、11:30PM.D、12:00PM.D男士说,餐馆周末的营业时间一直到午夜,即12:00pm。故答案是D。关键是分辨weekdays和weekend的不同营业时间,做笔记时要迅速和完整地记下细节,例如:w
最新回复
(
0
)