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2014年7月6日托福考试超好篇阅读题：
①American remove dams
There are a lot of dams all over America.These dams have taken very crucial roles.Some dams divert the flow of river water into a pipeline, canal, or channel. Others raise the level of inland waterways to make them navigable by ships and barges.The Americans build dams over streams,rivers and estuaries.They are used to prevent flood,create electricity or store for daily life and irrigate.Dams are built kind of for the same reasons why reservoirs are built.They can provide water for surrounding people and offer water for irrigation.............
