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
When a person falls asleep, all activity decreases and the muscles relax. The heartbeat and breathing【C1】______slow down. The pe
When a person falls asleep, all activity decreases and the muscles relax. The heartbeat and breathing【C1】______slow down. The pe
admin
2013-06-17
70
问题
When a person falls asleep, all activity decreases and the muscles relax. The heartbeat and breathing【C1】______slow down. The person slowly becomes less aware【C2】______what may be happening all around. A sleeping person changes the【C3】______of the entire body at least a dozen times during about eight hours of sleep. The head, arms, or legs are moved more often.
Scientists study sleep【C4】______an instrument. Whether a person is【C5】______or asleep, the brain gives【C6】______electrical waves. The instrument measures and records these waves. The brain of an awake, 【C7】______person gives off about 10 small waves a second. As a person falls deeply【C8】______sleep, the brain sends out slower but 【C9】______waves. The slowest, largest waves【C10】______during the first two or three hours of a period of sleep. During slow-wave sleep, mental activity【C11】______down but does not stop. Persons awakened【C12】______slow-wave sleep can often【C13】______unclear thoughts that they had while asleep. Periods of small, fast waves, 【C14】______to those of an awake person, occur at【C15】______during sleep. During these periods of fast brain wave activity, the sleeper’s eyes move rapidly as though they were watching the【C16】______of a dream. A sleeper who is awakened during such a period probably will recall dreaming and remember【C17】______of the dream. Sleep during these periods is called dreaming sleep or REM (Rapid Eye Movement) sleep. An eight-hour period of sleep includes from three to five periods of dreaming sleep. The dreaming sleep periods【C18】______from 5 to 30 minutes【C19】______and occur every 90 to 100 minutes. The【C20】______dream periods last longer than the earlier ones.
【C2】
选项
A、of
B、about
C、for
D、on
答案
A
解析
惯用衔接题。be aware of为固定搭配,意为“意识到……”,故答案为[A] of。
转载请注明原文地址:https://kaotiyun.com/show/84M7777K
0
大学英语四级
相关试题推荐
Accordingtoasurvey,whichwasbasedontheresponsesofover188,000students,today’straditional-agecollegefreshmenare"
Accordingtoasurvey,whichwasbasedontheresponsesofover188,000students,today’straditional-agecollegefreshmenare"
Thereisnodenyingthatstudentsshouldlearnsomethingabouthowcomputerswork,justasweexpectthematleasttounderstand
Childrenmodelthemselveslargelyontheirparents.Theydoso【1】throughidentification.Childrenidentifywithaparentwhenth
Teenageboys,regardlessofrace,aremorelikelytodiefromgunshotwoundsthanfromallnaturalcausescombined.Bythet
Theycallthemthenewbreadearners.Theyarewomen,andtheyaresettotakeover.Womenarebeginningtorise【1】totheto
Beijing’slocaleducationauthoritycompiledalistof"potentialsecurityproblems"-oncampuslastweek.Theyincludefireacc
A、Bybuses.B、Byprivatecars.C、Byrail.D、Byair.C根据文中提到的“InChinatodaythemostcommonwayoftravelingisstillbyrail”,可
Oneday,drought(干旱)maybeathingofthepastatleastincoastalcities.Vastareasofdesertthroughouttheworldmayforthe
Forthispart,youareallowed30minutestowritealetterofrefusal.Youshouldwriteatleast120words,andbaseyourcompo
随机试题
Ireallyhopethatyouwill______yourtriptoCanadaandgetbackassoonaspossible.
成人型呼吸窘迫综合征的综合治疗措施中,哪一项是不适当的【】
胃食管反流病的治疗目的是
“中华人民共和国的一切权力属于人民”体现了()原则。
节能量一般以()为计算单位。
招标文件要求中标人提交履约担保的,招标人()
导致市场失灵的原因主要有()。
学前教育的实质是()。
下面四项中的标点符号使用正确的一项是()。
以下是教材购销系统的描述,请仔细阅读并按要求回答问题。某图书管理系统有以下功能:A.借书:输入读者借书证,系统首先检查借书证是否有效。然后检查该读者所借图书是否超过10本,若已达到,拒借;未达到10本,办理借书,修改库存并记录。B.还书:从借书
最新回复
(
0
)