Unit One 1
Unit Two 10
Unit Three 19
Unit Four 26
Unit Five 33
Unit Six 40
Unit Seven 47
Unit Eight 54
Unit Nine 62
Unit Ten 70
Unit Eleven 78
Unit Twelve 86
Unit Thirteen 93
Unit Fourteen 101
Unit Fifteen 109
Unit Sixteen 117
Tapescript 录音书面材料 124
Answer Key 练习答案 279