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Contents序言 ⅢUnit Ⅰ：A Taste of America 1

Chapter 1 A Family Sees America Together 2

Chapter 2 The All-American Diner 13

Unit Ⅱ：Family Life 25

Chapter 3 How Alike Are Identical Twins? 26

Chapter 4 The Search for Happiness through Adoption 37

Unit Ⅲ：Technology on Earth and in Space 51

Chapter 5 Laptops for the Classroom 52

Chapter 6 The International Space Station：A World Project 63

Unit Ⅳ：Healthy Living 75

Chapter 7 The Dangers of Secondhand Smoke 76

Chapter 8 A Healthy Diet for Everyone 90

Unit Ⅴ：International Scientists 107

Chapter 9 Alfred Nobel：A Man of Peace 108

Chapter 10 Marie Curie：A Twentieth-Century Woman 120

Unit Ⅵ：The Earth's Resources and Dangers 133

Chapter 11 Oil as an Important World Resource 134

Chapter 12 How Earthquakes Happen 149

Index of Key Words 165

Answer Key 173