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1 Chapter 6 Business Trade I-1
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1.1 Background Knowledge
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1.2 Model Conversations
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1.3 Vocabulary
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2 Chapter 6 Business Trade I-2
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3 Chapter 7 Business Trade II-1
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3.1 Background Knowledge
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3.2 Model Conversations
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3.3 Vocabulary
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4 Chapter 7 Business Trade II-2