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27.What can we learn from the last paragraph?A.The“Time Capsule Library” focuses solely on Beijing's Hutongs.B.Technology is playing a crucial role in preserving cultural heritageC.Young people are losing interest in traditional Chinese architecture.D.Al models are more effective than physical preservation methodsCFor nearly a century,migratory flyways have been central to bird conservation,helping to protect habitats and monitor species.However, migratory freshwater fish,whichalsoundertakevast journeys,havebeenlargelyoverlooked.Unlike birdsfishmigrationsoccur underwater,making them invisible and harder to study.Since 1970,migratoryfreshwater fish populations have declined by over 80% due tohabitat destruction,overfishing,andpollution.To address this,researchers are mapping global swimways—migration routes forfreshwater fish—to guide conservation efforts. “Fish are the most affected migratoryspecies globally，” says Twan Stoffers,a fish ecologist.Dams are the biggest obstacle，blockingbreeding and feeding habitats.While dam construction has slowed in the U.S.andEurope,it has surged in Southeast Asia,particularly in the Mekong River system,hometo over 1,000 fish species and millions of livelihoods.The Mekong giant catish,for example,faces extinction due to dam barriers, though recent conservation efforts offer hope.Globally，only one-third of major rivers remain free-flowing,mostly in remoteregions like the Amazon.In Europe,rivers are so fragmented that identifying historicalswimways is nearly impossible.However,restoration efforts,such as dam removals on theKlamath River in the U.S.,have shown success,allwing salmon to return to breedingareasafteracentury.The Global Swimways Initiative，launched in 2023,aims to map migration routes forall2,400 migratory freshwater fish species.Instead of costly tracking methods,researchersare analyzing existing data from sources like FishBase and the IUCN Red List.“1'mshocked at how many species we still know little about,” Stoffers notes,highlighting theneedforbetter trackingtechnologyRivers are complex systems,connecting to floodplains and changing seasonally.“Fishmove between habitats.under specifc conditions,” says Zeb Hogan,a fish biologist.TheAmazon Basinillustrates this complexity，with its fooded forests andwetlands serving ascritical habitats.Many rivers span multiple countries，requiring international cooperation toprotectmigrationroutes.Justasflyways transformedbird conservation，swimwayscouldtransform rivermanagement.“Mapping these underwater highways is essential for the survival of freshwater2022级第三次诊断考试英语试卷第6页（共12页）