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1、2013年6月大学英语四级考试真题及答案详解Walking,ifyoudoitvigorouslyenough,istheoverallbestexerciseforregularphysicalactivity.Itrequiresnoequipment,everyoneknowshowtodoitanditcarriesthe47riskofinjury.Thehumanbodyisdesignedtowalk.Youcanwalkinparksoralongariverorinyourneighborhood.Toge
2、t48benefitfromwalking,aimfor45minutesaday,anaverageoffivedaysaweek.Strengthtrainingisanotherimportant49ofphysicalactivity.Itspurposeistobuildand50boneandmusclemass,bothofwhichshrinkwithage.Ingeneral,youwillwanttodostrengthtrainingtwoorthreedaysaweek,51recoverydaysb
3、etweensessions.Finally,flexibilityandbalancetrainingare52importantasthebodyages.Achesandpainsarehighonthelistofcomplaintsinoldage.Theresultofconstantmuscletensionandstiffnessofjoints,manyofthemare53,andsimpleflexibilitytrainingcan54thesebymakingmusclesstrongerandke
4、epingjointslubricated(润滑).Someofthisyoudowheneveryoustretch.Ifyouwatchdogsandcats,you’llgetanideaofhownaturalitis.Thegeneral55issimple:wheneverthebodyhasbeeninonepositionforawhile,itisgoodto56stretchitinanoppositeposition.A)allowingF)helpingK)preventB)avoidableG)in
5、creasinglyL)principleC)brieflyH)lowestM)provokeD)componentI)maintainN)seriouslyE)determinedJ)maximumO)topic2012年12月大学英语四级考试真题及答案详解Questions47to56isbasedonthefollowingpassage. Somanypeopleusethecellphonesofrequantlyeveryday,But___47__littleiscertainadouthehealtheff
6、ectsofitsuse.Macufacturers___48___thatcellphonesmeetgovernmentstandardsforsaferadio-frequencyradiationomission,butenoughstudiesarebeginningtodocumentapossible___49___inrarebraintumour(肿瘤)：bendachesandbehavioraldisordersinchildrentocauseconeem.Sofar,theavidenceisn't
7、___50___onwhethertheuseofcellphones__51__toanyuncasedriskofcancer.Inanew trial,researchersasked47yolunteersto___52__inaprojecttomeasureglucose(葡萄糖)consurnptioninthebrainbyscanningthebraintoseehowcellsuseenergy.Forboth50-minutescans,thevolunteershadacellphone__53__
8、toeachear.Duringbefirstscan,thedeviceswereturnedoff,butforthesecondscan,thephoneontherightearas___54____onandreceivedarecorded-messagecall,althou
