Unit 1 1
Teaching Reference 1
Key to Exercises 8
参考译文 12
Unit 2 15
Teaching Reference 15
Key to Exercises 18
参考译文 23
Teaching Reference 27
Unit 3 27
Key to Exercises 30
参考译文 35
Unit 4 38
Teaching Reference 38
Key to Exercises 45
参考译文 49
Unit 5 53
Teaching Reference 53
Key to Exercises 61
参考译文 65
Unit 6 68
Teaching Reference 68
Key to Exercises 76
参考译文 81
Unit 7 86
Teaching Reference 86
Key to Exercises 90
参考译文 94
Teaching Reference 99
Unit 8 99
Key to Exercises 107
参考译文 111
Unit 9 115
Teaching Reference 115
Key to Exercises 120
参考译文 125
Unit 10 129
Teaching Reference 129
Key to Exercises 136
参考译文 140