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1、第一篇CaptainCookArrowLegend（库克船长弓箭的传说）Itwasagreatlegendwhileitlasted,butDNAtestinghasfinallyendedatwo-century-olclstoryoftheHawaiianarrowcarvedfromtheboneofBritishexplorerCaptainJamesCookwhodiedintheSandwichIslandsin1779.“ThereisnoCookintheAustralianMus
2、eum,museumcollectionmanagerJudePhilipsaidnotlongagoinannouncingtheDNAevidencethatthearrowwasnotmadeofCook’sbone.Butthatwillnotstopthemuseumfromcontinuingtodisplaythearrowinitsexhibition,“Uncovered:TreasuresoftheAustralianMuseum,whichdoesincludeafeathe
3、rcapepresentedtoCookbyHawaiianKingKalani?opu?uin1778.CookwasoneofBritain?sgreatexplorersandiscreditedwithdiscoveringthe“GreatSouthLand,vnowAustralia,in1770.HewasclubbedtodeathintheSandwichIslands,nowHawaii.ThelegendofCooksarrowbeganin1824whenHawaiianK
4、ingKamehamehaonhisdeathbedgavethearrowtoWilliamAdams,aLondonsurgeonandrelativeofCook’swife,sayingitwasmadeofCook’sboneafterthefatalfightwithislanders.Inthe1890sthearrowwasgiventotheAustralianMuseumandthelegendcontinueduntil.itcameface—to—facewithscien
5、ce.DNAtestingbylaboratoriesinAustraliaandNewZealandrevealedthearrowwasnotmadeofCook’sbonebutwasmorelikelymadeofanimalbone,saidPhilp.However,Cook’sfansrefusetogiveuphopethatoneCooklegendwillprovetrueandthatpartofhisremainswi11stillbeuncovered,astheysay
6、thereisevidencenotallofCook’sbodywasburiedatseain1779.“Onthisoccasiontechnologyhas'von,’’saidCliffThornton,presidentoftheCaptainCookSociety,inastatementfromBritain.“ButIamsurethatoneofthesedays".oneoftheCooklegendswillprovetobetrueanditwillhappenoneda
7、y.’’第二篇AvalancheandItsSafety（雪崩和安全问题）Anavalancheisasuddenandrapidflowofsnow,oftenmixedwithairandwater,downamountainside.Avalanchesareamongthebiggestdangersinthemountainsforboth1ifeandproperty.Allavalanchesarecausedbyanover-burdenofmaterial,typicallysn
8、owpack,thatistoomassiveandunstablefortheslopethatsupportsit.Determiningthecriticalload,theamountofover-burdenwhichislikelytocauseanavalanche,isacomplextaskinvolvingtheevaluationofanumberoffactors.Terrainsiopesflatterthan25degreesorsteeperthan6
