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Unit 1 1
Unit 2 4
Unit 3 7
Unit 4 10
Unit 5 13
Unit 6 16
Unit 7 19
Unit 8 22
Mid-term Examination 25
Unit 9 28
Unit 10 31
Unit 11 34
Unit 12 37
Unit 13 40
Unit 14 43
Unit 15 46
Unit 16 49
Final Examination 52
听力原文 55
参考答案 122