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
30
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.
【C4】
选项
A、by
B、upon
C、around
D、with
答案
D
解析
惯用衔接题。使用某种工具或手段通常用介词with,由此可知答案为[D]。而[A]by虽与with同义,但其多用于被动语态之中,故排除。
转载请注明原文地址:https://kaotiyun.com/show/N4M7777K
0
大学英语四级
相关试题推荐
ThoughtsofsuicidehauntedAnitaRutnamlongbeforeshearrivedatSyracuseUniversity.Shehadahistoryofmentalillnessand
Whatispopculture?Well,popis【11】forpopular.Thebeginningofpopculturecanoftenberelatedtopopularmovies,televisio
Teenageboys,regardlessofrace,aremorelikelytodiefromgunshotwoundsthanfromallnaturalcausescombined.Bythet
A、Atapolicestation.B、Atajewelleryshop.C、Atadetective’soffice.D、Atthesceneofarobbery.B
Listeningtomusicwhileyoudrivecanimproveyourreactiontimeandabilitytoavoidhazards,accordingtoAustralianpsycholo
Beijing’slocaleducationauthoritycompiledalistof"potentialsecurityproblems"-oncampuslastweek.Theyincludefireacc
Studieshaveshownthatstudentswhotakeseveraltestslearnmorethan_______________(看完资料只参加一次测试的学生).
Oneday,drought(干旱)maybeathingofthepastatleastincoastalcities.Vastareasofdesertthroughouttheworldmayforthe
Timeis,fortheaverageAmerican,ofutmostimportance.Tothe【B1】______visitor,Americansseemtobemoreconcernedwithgetti
随机试题
用于鉴别糖或苷类存在的反应是
()才是构成证明承包人所施工的工程已经完成的批准文件。
某工程质量事故经调查发现,是由于施工单位在施工过程中未严格执行材料检验程序,使用了不合格的钢结构构件造成的,则按照事故产生的原因划分,该质量事故应判定为()。
具有提前赎回可能性的债券应具有较高的票面利率,其内在价值相对较低。()
新学期开始不久,我发现班上出现了这么一个现象:当幼儿需要移动小椅子进行活动的时候,总是习惯用一只手拎住椅背拖行,或是把椅背夹在腋下,像拄着拐杖一样,一摇一晃地行走。每当这个时候,教室里总是充斥着一种椅子在地板上敲打摩擦的声音,很是刺耳,也不安全。起先是一两
中秋节前,市场上出现了许多包装精美的高价月饼。要使高价月饼物有所值,必须切实提高质量,保证货真价实。这表明()。
注意事项1.本题本由给定资料与作答要求两部分构成。考试时限为150分钟。其中,阅读给定资料参考时限为40分钟,作答参考时限为110分钟。满分100分。2.监考人员宣布考试开始时,你才可以开始答题。3。请在题本、答题卡指定位置填
使用绝对路径名访问文件是从()开始按目录结构访问某个文件。
《国防教育法》
【B1】【B18】
最新回复
(
0
)