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- 问题详情：TheUnitedStatesisfullofcars.Therearestillmanyfamilieswithoutcars,butsomefamilieshavetwoormore.However,carsareusedformorethanpleasure.Theyareanecessarypartoflife.Carsareusedforbusiness.Theyaredriventoofficesandfactoriesbyworkerswhohavenootherw...
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