Unit 1 Is There Life on Earth? 1
Unit 2 The Dinner Party 17
Unit 3 Lessons from Jefferson 32
Unit 4 My First Job 47
Unit 5 The Professor and the Yo-Yo 64
Mid-term Test 80
Unit 6 The Making of a Surgeon 91
Unit 7 There's Only Luck 107
Unit 8 Honesty：Is It Going out of Style? 123
Unit 9 What Is Intelligence,Anyway? 139
Unit 10 Profits of Praise 154
Final Test 170
Appendix Key to Exercises and Tests 182