Unit 1 Changes in the Way We Live
Unit 2 Givil-Rights Heroes
Unit 3 Security
Unit 4 Imagination and Creativity
Test Yourself （Unit 1-4）
Unit 5 Giving Thanks
Unit 6 The Human Touch
Unit 7 Making a Living
Unit 8 Cloning
Test Yourself （Unit 5-8）
Appendix Ⅰ Key to Exercises in Parts Ⅰ，Ⅲ，Ⅳ
Appendix Ⅱ Tape Script and Key to Test Papers
Appendix Ⅲ Glossary
