根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。Sleepissomethingwealldo．Butsomepeopleneedtosleepmorethanothers．Babiessleepmostofthe

　　根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

　　Sleepissomethingwealldo．Butsomepeopleneedtosleepmorethanothers．Babiessleepmostofthetime．Childreninschoolsleepabouttentotwelvehoursanight．Mostgrown-upssleeponlysevenoreighthours．1

　　Allpartsofourbodieshavetorestaftertheywork．Ourarmsneedarestafterweliftheavythings．Whenwerunfastourlegsworkhard．Theygettired．Wehavetorestthem．Ourbrainsworkhardtoo．2Wecansitquitestillandrestourarmsandlegs．Butourbrainsaren'tresting．Theygorightonthinkingaslongasweareawake．

　　Ourbrainsslowdownabitwhenwesleepanddream．3Insteadofthinkingwide-awakethoughtourbrainsmakeupdreams．Somedreamsareverypleasing．Somearenot．Mostofthetimeweforgetthemwhenwewakeup．

　　Scientistshavetriedtofindoutwhatwouldhappenifpeoplewerenotallowedtosleep．Theyaskedsomepeoplenottogotobed．Thepeoplestayedupallnightandallthenextday．Theystayedupthenextnighttooandthedayafter．Theyplayedgames．Buttheymademistakes．Theyforgotthings．4．Thepeoplegrewrudeandmean．Theybecameangrywiththeirfriends．Finallytheyweretootiredtostandup．Themomenttheysatdowntheyfellasleep．

　　Scientistsfoundthatifpeoplearenotallowedtosleeptheyactinanunusualway．5Butwedoknowthatweneedittostaywell．

　　Sotonighthaveagoodsleep．Liedownunderthecovers．Shutyoureyes．Letyourthoughtstravelabout．Soonyou'llstopthinking．You'llbeasleep．

　　A．Butevenaswesleepourbrainsaredoingsomework．

　　B．Itwashardfortheirtiredbrainstowork．

　　C．Whenweareawaketheyhelpuspayattentiontotheworldaroundus．

　　D．Nooneknowsquitesurelywhysleepissogoodforus．

　　E．Goodsleephelpstoimproveone'smemory．

　　F．Butbabieschildrenandgrown-ups-allofusneedtohaveoursleep．