目录 Introduction How to Use This Book Chapter 1 Social Studies ★ History and Geography ① | 9 Unit 01 A Nation of Diversity 多样化的国家 | 10 Unit 02 The American Electoral System 美国的选举制度 | 14 Unit 03 History and Culture 历史与文化 | 18 Unit 04 The Native People of North America 北美原住民 | 22 Unit 05 The Age of Exploration 地理大发现 | 26 Review Test 1 | 30 Chapter 2 Social Studies ★ History and Geography ② | 31 Unit 06 The Spanish Conquerors 西班牙征服者 | 32 Unit 07 Colonial America 殖民时代的美国 | 36 Unit 08 The Declaration of Independence 《独立宣言》 | 40 Unit 09 Post Civil War 后内战时期 | 44 Unit 10 The United States in the Modern Age 近代美国 | 48 Review Test 2 | 52 Chapter 3 Science ① | 53 Unit 11 Classifying Living Things 生物的分类 | 54 Unit 12 Plant Structure 植物的结构 | 58 Unit 13 Plants Without Seeds 孢子植物 | 62 Unit 14 Flowers and Seeds 花朵与种子 | 66 Unit 15 Adaptations 适应 | 70 Review Test 3 | 74 Chapter 4 Science ② | 75 Unit 16 The Human Body 人体 | 76 Unit 17 Ecosystems 生态系统 | 80 Unit 18 Earth and Resources 地球与资源 | 84 Unit 19 Matter 物质 | 88 Unit 20 The Universe 宇宙 | 92 Review Test 4 | 96 Chapter 5 Mathematics | 97 Unit 21 Numbers 数字 | 98 Unit 22 Computation 计算 | 102 Unit 22 Decimals, Fractions, and Ratios 小数、分数与比 | 106 Unit 24 Geometry 几何 | 110 Review Test 5 | 114 Chapter 6 Language ★ Visual Arts ★ Music | 115 Unit 25 Stories, Myths, and Legends 故事、神话与传说 | 116 Unit 26 Learning About Literature 文学的学习 | 120 Unit 27 Learning About Language 语言的学习 | 124 Unit 28 Renaissance Art 文艺复兴艺术 | 128 Unit 29 American Art 美国艺术 | 132 Unit 30 A World of Music 音乐的世界 | 136 Review Test 6 | 140
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