Unit 1 1
Teaching Reference 1
Key to Exercises 5
参考译文 9
Unit 2 14
Teaching Reference 14
Key to Exercises 18
参考译文 24
Unit 3 27
Teaching Reference 27
Key to Exercises 32
参考译文 37
Unit 4 43
Teaching Reference 43
Key to Exercises 48
参考译文 53
Unit 5 59
Teaching Reference 59
Key to Exercises 64
参考译文 68
Unit 6 73
Teaching Reference 73
Key to Exercises 78
参考译文 82
Unit 7 86
Teaching Reference 86
Key to Exercises 90
参考译文 93
Unit 8 97
Teaching Reference 97
Key to Exercises 101
参考译文 106
Unit 9 112
Teaching Reference 112
Key to Exercises 118
参考译文 122
Unit 10 128
Teaching Reference 128
Key to Exercises 134
参考译文 138