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BWespendaroundonethirdofourlivesinbed,andthebodydoesalotofitsrepairworkaswesleep,soenoughgoodqualitysleepisveryimportanttoourhealth.Itdoesn'tstopthere,though-somesleeppositionsarehealthierthanothers.Sowhichsleeppositionisthehealthiest?Sleepingonyourbackisthehealthiestsleepposition,Healthbenefitsincludeavoidingbackandneckpain.Becausetheheadisraisedabovethestomachwhenyousleeponyourback,thispositionisbestforpeoplewhosufferfromnighttimeacidreflux(aswell.Around80%ofheartburnsufferershaveproblemsduringthenight,sosleepingontheirbackcouldhelpalotofpeopletoenjoyagoodnight'ssleep.Ifthesleeppositionaloneisnotenoughtoalleviatethecondition,tryraisingtheheadofthebedbyupto4inchesbyplacingblocksunderit.Whenyousleeponyourback,yourfaceisinanaturalposition.Thismeanslesswrinkles()Ifyoureallycan'tfacesleepingonyourback,anotherhealthysleeppositionisthesidesleep.It'salmostasgoodasthebackposition,andit'sbetterforpeoplewhosnoreandtheirpartners.Whicheversleeppositionyouchoose,useapillowthatsupportstheheadandtheneckwithoutraisingtheheadunnaturally,asthiscanbringneckpain.24.WhichisNOToneofthebenefitsofsleepingontheback?A.Itcanavoidacidreflux.B.Itmakespeoplelookyounger.C.It'sgoodforheartburnsufferers.D.Ithelpspeoplegetridofstomachpain.25.Whichisthebestsleeppositionforpeoplewhosnore?A.Sleepontheface.B.Sleepontheside.C.Sleepontheback.D.Sleepwithoutpillows.26.Theunderlinedword"alleviate"inParagraph2probablymeansA.makeitlessseriousB.makepeopleforgetC.makeitlessusefulD.makepeopleenjoy27.Whatdoesthetextmainlytalkabout?A.Waystokeepushealthy.B.Theimportanceofsleep.C.Sleep'srepairingfunctions.D.Healthypositionsofsleep.CWilliamButlerYeats,amostfamousIrishwriter,wasborninDublinonJune13,1865.Hischildhoodlackedtheharmony(thatwastypicalofahappyfamily.Later,Yeatsshockedhisfamilybysayingthatheremembered"littleofchildhoodbutitspain".Infact,heinherited(excellenttasteinartfromhisfamily-bothhisfatherandhisbrotherwerepainters.Buthefinallysettledonliterature,particularlydrama(戏剧)andpoetry.Yeatshadstrongfaithincomingofnewartisticmovements.HesethimselfthefreshtaskinfoundinganIrishnationaltheatreinthelate1890s.Hisearlytheatricalexperiments,however,werenotreceivedfavourablyatthebeginning.Hedidn'tloseheart,andfinallyenjoyedsuccessinhispoeticaldrama.Comparedwithhisdramaticworks,Yeats'spoemsattractmuchadmiringnotice.Thesubjectmatterincludeslove,nature,history,timeandaging.ThoughYeatsgenerallyreliedonverytraditionalforms,hebroughtmodernsensibilitytothem.Ashisliterarylifeprogressed,hispoetrygrewfinerandricher,whichledhimtoworldwiderecognition.HehadnotenjoyedamajorpubliclifesincewinningtheNobelPricein1923.Yet,hecontinued高二英语学科试题第4页（共9页）
4.天文观测发现,天狼星A与其伴星B是一个双星系统。它们始终绕着O点在两个不同椭圆轨道上运动,如图所示,实线为天狼星A的运行轨迹,虚线为其伴星B的轨迹,则()A.A的运行周期小于B的运行周期B.A的质量小于B的质量C.A的加速度总是小于B的加速度D.A与B绕O点的旋转方向可能相同,可能相反
10.如图甲所示,空间中有与水平方向夹角为θ斜向右上方的匀强电场,在绝缘的水平面上静置着一个均匀带电的箱子,箱子内有一个不带电的小物块,小物块和箱子一起向右做匀加速直线运动,箱子恰好与地面间没有摩擦力,小物块恰好在箱子后壁上不下滑。如图乙所示,从某时刻开始(记为.t=0)匀强电场的电场强度大小随时间均匀减小,则小物块竖直方向加速度ay(以落到箱子底面上为截止时间)随时间变化图像可能正确的是
15.(8分)如图所示,闭合开关后,电压表示数为2V,电流表示数为0.8~1.3A之间的某个值。一段时间后,某电阻发生了故障,两表的示数变为4.5V和1.5A。已知电源电动势E=6V,R3=1。(1)电路中哪一个电阻发生了故障?属于何种故障?(2)求电阻R1的阻值;(3)求电源内阻r及电阻R2的阻值。
