考研英语（完形填空）模拟试卷13（共380题）.pdfVIP

考研英语完（形填空）模拟试卷13共（

9套）

共（380题）

考研英语完（形填空）模拟试卷第1套

一、完型填空本（题共40题，每题上0分，共40分。）

TheEarthsdailyclock,measuredinasinglerevolution,istwenty-fourhours.Thehuman

clock,[Cl],isactuallyabouttwenty-fivehours.Thats[C2]

scientistswhostudysleehavedeterminedfromhumansubjectswholiveforseveral

weeksinobservationchamberswithno[C3]ofdayornight.Sleeresearchers

have[C4]othersurrisingdiscoveriesaswell.Wesendaboutone-thirdofour

livesaslee,afactthatsuggestssleeing,[C5]eatingandbreathing,isa

fundamentalliferocess.Yetsomeeolealmostneverslee,gettingbyonas[C6]

asfifteenminutesaday.Andmorethanseventyyearsof[C7]into

sleederivation,inwhicheolehavebeenket[C8]forthreetotendays,

has[C91onlyonecertainfinding:Sleelossmakesaersonsleeyandthats

aboutall;itcausesnolastingill[CIO].Toomuchslee,however,maybe

[Cl1]foryou.Thesefindings[C12]somelong-heldviewsofslee,

andthey【Cl3】questionsaboutitsfundamentaluroseinourlives.In[C14]

,scientistsdontknowjustwhysleeisnecessary.Somescientiststhinksleeis

moretheresultofevolutionaryhabitthan[C15]actualneed,Animalssleefor

someartsofthedayerhasbecauseitisthe[C16]thingforthemtodo:it

keesthem[C17]andhiddenfromredators;itsasurvivaltactic.Beforethe

adventofelectricity,humanshadtosendatleastsom