Unit 1 A Kind of Sermon 1
Unit 2 The Fifth Freedom 9
Unit 3 Your Key to a Better Life 22
Unit 4 Super Kids and Super Problems 33
Unit 5 Science and the Scientific Attitude 41
Unit 6 Love Story 55
Unit 7 Roaming the Cosmos 68
Unit 8 I Have a Dream 76
Appendix 1 Key to Exercises （Unit 1 - Unit 8） 90
Appendix 2 Chinese Translations of the Texts （Unit 1 - Unit 8） 118
Appendix 3 Chinese Translations of the Reading Passages （Unit 1 - Unit 8） 136