social practice

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Hello,dear mylotters!I watched the movie Ups today,and I got quite confused about the boy Russel's original purpose.He said he wanted to assist Mr.Fredricksen to get his sign for the barges.And my question is :dose the barges have something to do with the social pratice?In, American ,do student of all ages atten social practice?And what kind of pratice ? I'm really appreciate your help~ Happy today^-^