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Ŀ¼ Introduction How to Use This Book Chapter 1 Social Studies History and Geography ¢Ù | 9 Unit 01 Our Community Éç»á»·¾³ | 10 Unit 02 Home and School Life ¼ÒÍ¥ÓëѧУÉú»î | 14 Unit 03 Different Cultures and Holidays ÎÄ»¯Óë½ÚÈÕ²îÒì | 18 Unit 04 The American Government ÃÀ¹úÕþ¸® | 22 Unit 05 World Religions ÊÀ½ç×Ú½Ì | 26 Review Test 1 | 30 Chapter 2 Social Studies History and Geography ¢Ú | 31 Unit 06 Our Land and Water ÍÁµØÓëË®×ÊÔ´ | 32 Unit 07 Oceans and Continents º£ÑóÓë´óÖÞ | 36 Unit 08 Maps and Directions µØͼÓ뷽λ | 40 Unit 09 Our Earth and Its Resources ÎÒÃǵĵØÇòºÍ×ÊÔ´ | 44 Unit 10 Native Americans and Europeans in the New World дó½µÄÃÀÖÞÓ¡µÚ°²È˺ÍÅ·ÖÞÈË | 48 Review Test 2 | 52 Chapter 3 Science ¢Ù | 53 Unit 11 Seasons and Weather ¼¾½ÚÓëÆøºò | 54 Unit 12 The Parts of a Plant Ö²ÎïµÄ×é³É²¿·Ö | 58 Unit 13 Homes for Living Things ÉúÎïµÄÆÜÏ¢µØ | 62 Unit 14 Oceans and Undersea Life º£ÑóºÍË®ÉúÉúÎï | 66 Unit 15 The Human Body ÈËÌå | 70 Review Test 3 | 74 Chapter 4 Science ¢Ú | 75 Unit 16 How Can Matter Change? ÎïÖÊÈçºÎ±ä»¯£¿ | 76 Unit 17 How Long? How Tall? ¶à³¤£¿¶à¸ß£¿ | 80 Unit 18 Electricity µç | 84 Unit 19 Our Solar System Ì«Ñôϵ | 88 Unit 20 Inside the Earth µØÇòµÄÄÚ²¿ | 92 Review Test 4 | 96 Chapter 5 Mathematics | 97 Unit 21 Shapes ÐÎ×´ | 98 Unit 22 Numbers and Counting Êý×ֺͼÆÊý | 102 Unit 23 Addition and Subtraction ¼Ó·¨ºÍ¼õ·¨ | 106 Unit 24 Counting Money ÊýÇ® | 110 Review Test 5 | 114 Chapter 6 Language Visual Arts Music | 115 Unit 25 Read and Write ÔĶÁºÍд×÷ | 116 Unit 26 Types of Writing д×÷µÄÀàÐÍ | 120 Unit 27 A World of Lines and Colors ÏßÌõÓëÉ«²ÊµÄÊÀ½ç | 124 Unit 28 A World of Paintings »æ»­µÄÊÀ½ç | 128 Unit 29 Instruments and Their Families ÀÖÆ÷µÄÖÖÀà | 132 Unit 30 A World of Music ÒôÀÖµÄÊÀ½ç | 136 Review Test 6 | 140 Index | 141 Answers and Translations | 147