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C2B is the r（）of the traditional e-commerce model of B2C.(an exchange of positions or functions)

C2B is the r（）of the traditional e-commerce model of B2C.(an exchange of positions or functions)
正确答案：reversal

上一条：The main differences between e-commerce and m-commerce are m（）， location tracking and security.(the ability to move or travel around easily)

下一条：Effective l（）is the key to a successful e-commerce business.(the business of transporting and delivering goods)