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1、2020年高考英语真题和模拟题分项汇编专题07阅读理解说明、议论文一、2020年高考真题说明文1.【2020·全国卷I，C】Racewalkingsharesmanyfitnessbenefitswithrunning,researchshows,whilemostlikelycontributingtofewerinjuries.Itdoes,however,haveitsownproblem.Racewalkersareconditionedathletes.Thelongesttrackandfieldeven
2、tattheSummerOlympicsisthe50-kilometerracewalk,whichisaboutfivemileslongerthanthemarathon.Butthesport’srulesrequirethataracewalker’skneesstaystraightthroughmostofthelegswingandonefootremainincontact(接触)withthegroundatalltimes.It’sthisstrangeformthatmakesracewalk
3、ingsuchanattractiveactivity,however,saysJaclynNorberg,anassistantprofessorofexercisescienceatSalemStateUniversityinSalem,Mass.Likerunning,racewalkingisphysicallydemanding,shesays,Accordingtomostcalculations,racewalkersmovingatapaceofsixmilesperhourwouldburnabou
4、t800calories(卡路里)perhour,whichisapproximatelytwiceasmanyastheywouldburnwalking,althoughfewerthanrunning,whichwouldprobablyburnabout1,000ormorecaloriesperhour.However,racewalkingdoesnotpoundthebodyasmuchasrunningdoes,Dr.Norbergsays.Accordingtoherresearch,runners
5、hitthegroundwithasmuchasfourtimestheirbodyweightperstep,whileracewalkers,whodonotleavetheground,createonlyabout1.4timestheirbodyweightwitheachstep.Asaresult,shesays,someoftheinjuriesassociatedwithrunning,suchasrunner’sknee,areuncommonamongracewalkers.Butthespor
6、t’sstrangeformdoesplaceconsiderablestressontheanklesandhips,sopeoplewithahistoryofsuchinjuriesmightwanttobecautiousinadoptingthesport.Infact,anyonewishingtotryracewalkingshouldprobablyfirstconsultacoachorexperiencedracertolearnpropertechnique,shesays.Ittakessom
7、epractice.1.Whyareracewalkersconditionedathletes?A.Theymustrunlongdistances.B.Theyarequalifiedforthemarathon.C.Theyhavetofollowspecialrules.D.Theyaregoodatswingingtheirlegs.2.Whatadvantagedoesracewalkinghaveoverrunning?A.It’smorepopularattheOlympics.B.It’slessc
8、hallengingphysically.C.It’smoreeffectiveinbodybuilding.D.It’slesslikelytocausekneeinjuries.3.WhatisDr.Norberg’ssuggestionforsomeonetryingracewalking?A.Gettingexperts’opinion
