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[单选]DSupertyphoonRammasunsweptoverHainan,China,destroyingatleast23,000housesandcausing2billiondollarsindamage.Itwasnotjustpeoplewhoexperiencedtheimpact,though.InHainanBawanglingNationalNatureReserve,hometotheworld"s30remainingHainangibbons(长臂猿),landslidestorethroughsectionsoftheforest.Thegibbons,aspecieslivingintrees,wereforcedtojumpacrossadistanceofupto50feettogetfromoneareatoanother.Thegibbonssometimeswouldbreaktheirfallonlybymanagingtocatchholdofthetipofaparticularpalmleaf.Asmonthspassed,BoscoChanattheKadoorieFarmandBotanicGardeninHongKongnoticedthatconstantusecausedtheleaftowearandbenddownward,threateningtoleadtothegibbonscrashingdownandbreakingtheextremelyrarespecies"habitatintodifferentislands."It"sreallyamatterofconcern.Moreover,Ididn"tknowhowlongtheleafwouldbeabletoholdthegibbons,"hesaid."Ithoughtitwastimeforustobuildsomething."AsrecentlydescribedinScientificReports,BoscoChanandhiscolleaguesturnedtoaerial(空中的)bridges.Theyhiredprofessionaltreeclimberstoconfrontandgetoverthesteeplandformtofixasimplebridge,consistingoftwoparallelmountaineering-graderopes.Ittookthegibbonsoverfivemonthstocatchon,butoncetheylearnedtousetheropes,theystartedregularlyusingthemtomakesafe,quickcrossings.Tillnow,aerialbridgeshavebeenusedinothercountriestohelpadiversityofanimalsrangingfromsquirrelstocapuchinmonkeys.Butmanyaresmall,one-offprojectscarriedoutbylocalorganizationsorevenindividuals;withlittleornoscientificstudyofwhatdoesordoesnotwork.Inaddition,asolutionforonespeciesorhabitatmaynotbeapplicabletoanother.12.WhatcanbelearnedaboutHainangibbons?()