Unit 1 Changes in the Way WeLive
Unit 2 Civil-Rights Heroes
Unit 3 Security
Unit 4 Extraterrestrials
Unit 5 How to Celebrate Holidays
Unit 6 The human touch
Unit 7 Making a living
Unit 8 Cloning
Appendix Ⅰ:Key to exercies(Units1-8)
Appendix Ⅱ:Chinese translations of texts A (Units1-8)
Appendix Ⅲ:Chinese translations of texts B (Units1-8)
