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Unit 1 Introduction to E-commerce Passage A Vocabulary Notes Exercises Passage B Unit 2 Models of E-commerce Passage A Vocabulary Note Exercises Passage B Unit 3 Internet Payment Passage A Vocabulary Notes Exercises Passage B Unit 4 E-commerce Logistics Passage A Vocabulary Notes Exercises Passage B Unit 5 Network Marketing Passage A Vocabulary Notes Exercises Passage B Unit 6 Customer Relationship Management Passage A Vocabulary Notes Exercises Passage B Unit 7 Mobile Commerce Passage A Vocabulary Notes Exercises Passage B Unit 8 E-commerce Security Passage A Vocabulary Notes Exercises Passage B ²Î¿¼ÎÄÏ×