Unit One 1
Objectives 1
Teaching Process 2
Key to the Exercises 17
参考译文 22
Unit Two 25
Objectives 25
Teaching Process 26
Key to the Exercises 53
参考译文 57
Unit Three 60
Objectives 60
Teaching Process 61
Key to the Exercises 77
参考译文 82
Unit Four 86
Objectives 86
Teaching Process 87
Key to the Exercises 101
参考译文 105
Unit Five 108
Objectives 108
Teaching Process 109
Key to the Exercises 126
参考译文 132
Unit Six 136
Objectives 136
Teaching Process 138
Key to the Exercises 158
参考译文 164
Unit Seven 168
Objectives 168
Teaching Process 169
Key to the Exercises 194
参考译文 198
Unit Eight 202
Objectives 202
Teaching Process 203
Key to the Exercises 221
参考译文 226