1A：Listening Activities unit 1－Listening Activities unit 3
1B：Listening Activities unit 3－Listening Activities unit 5
2A：Listening Activities unit 6－Listening Activities unit 9
2B：Listening Activities unit 9－Listening Activities unit 12
3A：Listening Activities unit 13－Listening Activities unit 17
3B：Listening Activities unit 17－Model Dialogues unit 4
4A：Model Dialogues unit 4－Model Dialogues unit 12
4B：Model Dialogues unit 12－Model Dialogues unit 17
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