Introduction How to Use This Book Chapter 1 Social Studies ★ History and Geography ① | 9 Unit 01 Laws and Rules 法律与规范 | 10 Unit 02 Earning, Spending, and Saving 收入、支出与储蓄 | 14 Unit 03 Goods and Resources 商品与资源 | 18 Unit 04 Technology Changes the World 科技改变世界 | 22 Unit 05 Living in Different Climates 生活在不同的气候中 | 26 Review Test 1 | 30 Chapter 2 Social Studies ★ History and Geography ② | 31 Unit 06 Geography Skills 地理技能 | 32 Unit 07 The Government 政府部门 | 36 Unit 08 Ancient Egypt 古埃及 | 40 Unit 09 Ancient Greece 古希腊 | 44 Unit 10 Ancient Rome 古罗马 | 48 Review Test 2 | 52 Chapter 3 Science ① | 53 Unit 11 A World of Plants 植物的世界 | 54 Unit 12 A World of Animals 动物的世界 | 58 Unit 13 Food Chains 食物链 | 62 Unit 14 Ecosystems 生态系统 | 66 Unit 15 Earth’s Rocks and Soil 地球的岩石和土壤 | 70 Review Test 3 | 74 Chapter 4 Science ② | 75 Unit 16 Conserving Our Resources 保护资源 | 76 Unit 17 Earth’s Changing Surface 地表的变化 | 80 Unit 18 Weather and the Water Cycle 天气和水循环 | 84 Unit 19 The Universe 宇宙 | 88 Unit 20 The Senses 各种感官 | 92 Review Test 4 | 96 Chapter 5 Mathematics | 97 Unit 21 Fractions 分数 | 98 Unit 22 Geometry 几何学 | 102 Unit 23 Multiplication and Division 乘法和除法 | 106 Unit 24 Measurement 测量 | 110 Review Test 5 | 114 Chapter 6 Language ★ Visual Arts ★ Music | 115 Unit 25 Myths from Ancient Greece 古希腊神话 | 116 Unit 26 Learning About Language 学习语言 | 120 Unit 27 Appreciating Artwork 艺术鉴赏 | 124 Unit 28 Creating Designs 创造设计 | 128 Unit 29 Elements of Music 音乐的元素 | 132 Unit 30 A World of Music 音乐的世界 | 136 Review Test 6 | 140
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