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1、Unit21HumanBiologyPaddleboarding(划桨冲浪)isnowbecomingmoreandmorepopularintheoutdoorrecreation(娱乐)industry.Peopleareincreasinglydrawntothesportthatcanbedoneforexerciseandracingorforpaddlingoryogawithfriendsandevendogsaboard.TakingpartinstanduppaddleboardingintheUnit
2、edStateshasincreasednearlythreetimesfrom2013to2016,accordingtoastudyfromtheOutdoorFoundation.Thatmakesitoneofthefastestgrowingoutdoorsports,thefoundationsays.Thesportiseasytolearnandcanbepracticedallaroundtheworld,saidJimmyBlakeney,marketingmanageratBICSUP,oneoft
3、heleadingcompaniesmakingboards.Andthere'swhatBlakeneycallsthe“coolfactor(要素)”thatalsodrawspeople.“You'restandingup,you'reinyourbikini,you'rebeingseen，”Blakeneysaid.“Boardsarecool.Alotofyoungpeoplereallylikebeingonaboardmorethanaboat.”Themodernpaddleboardingorigin
4、atedinHawaii,wheresurfersusedpaddlestogetoutfurtherordoexercisewhentherewerenowaves.ThesportslowlyspreadfromHawaiiandhasbeenaroundintheUnitedStatesforabout10years,Blakeneysaid.Growthreallyaccelerated(加速)aboutfiveyearsago,headded.TheStandUpPaddleIndustryAssociatio
5、nwasformedin2012tobringsupportforproducers,sellersandpeoplewhoteach,trainandorganizeraces.KristinThomas,theindustryassociation'sdirector,saidtheversatility(多功能性)oftheboardsisahugedraw.“It'sveryeasytouseandyetcanbeasextremeasyouwantittobe.Peoplearesurfinghugewaves
6、.Theyaredoingwhitewater，”Thomassaid.Mostofthepeoplearerecreationaluserswhousetheboardsabout10timesayear,hesaid.Asmallernumberofpeople,oftenthetypeswhoaredrawntorunning,usetheboardsforexerciseandcompete,Blakeneysaid.Section_ⅠWarmup&Lesson1—Prereading[原文呈现]100metre
7、sin8seconds?Manycontemporary①amateurathleteswouldhavebrokenworldrecordsiftheyhadtakenpartin②thefirstOlympicGames.Sincethen,recordshavefallenintrackandfield③yearafteryear④asathleticperformanceshavecontinuallyimproved.Ifrecordsfall,itisusuallyduetobetterequipment,t
8、raininganddiet,butrecently,improvementshavebeguntoslowdown⑤.Atthe2000Olympics,onlythreerunnersachievedOlympicbests⑥withnoworldrecords.Someexpertspredictaceilin
