Abbreviations and Symbols 1
Unit 1 1
Unit 2 17
Unit 3 32
Unit 4 48
Revision Exercises(Unit 1—Unit 4) 69
Unit 5 76
Unit 6 95
Unit 7 114
Unit 8 134
Revision Exercises(Unit 5一Unit 8) 156
Unit 9 163
Unit 10 183
Unit 11 202
Unit 12 221
Revision Exercises(Unit 9-Unit 12) 243
Appendix 1 Irregular Verbs 251
Appendix 2 Phrases and Expressions 254
Appendix 3 Vocabulary 260
Acknowledgements 318