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Ŀ¼ Introduction How to Use This Book Chapter 1 Social Studies History and Geography ¢Ù | 9 Unit 01 The West Region of the United States ÃÀ¹úÎ÷²¿µØÇø | 10 Unit 02 The Southwest Region of the United States ÃÀ¹úÎ÷Äϲ¿µØÇø | 14 Unit 03 The Southeast Region of the United States ÃÀ¹ú¶«Äϲ¿µØÇø | 18 Unit 04 The Northeast Region of the United States ÃÀ¹ú¶«±±²¿µØÇø | 22 Unit 05 The Midwest Region of the United States ÃÀ¹úÖÐÎ÷²¿µØÇø | 26 Review Test 1 | 30 Chapter 2 Social Studies History and Geography ¢Ú | 31 Unit 06 The Mountain States of the United States ÃÀ¹úɽÇøÖîÖÝ | 32 Unit 07 Mountains, Rivers, and Deserts of the World ÊÀ½çÉϵÄɽ´¨¡¢ºÓÁ÷ºÍɳĮ | 36 Unit 08 Asian Cultures ÑÇÖÞÎÄ»¯ | 40 Unit 09 Europe in the Middle Ages ÖÐÊÀ¼ÍµÄÅ·ÖÞ | 44 Unit 10 The Civil War ÃÀ¹úÄϱ±Õ½Õù | 48 Review Test 2 | 52 Chapter 3 Science ¢Ù | 53 Unit 11 Inquiry Skills and Science Tools ̽Ë÷¼¼ÊõÓë¿Æѧ¹¤¾ß | 54 Unit 12 Classifying Living Things ÉúÎïµÄ·ÖÀà | 58 Unit 13 Heredity ÒÅ´« | 62 Unit 14 The History of the Earth µØÇòµÄÀúÊ· | 66 Unit 15 The Weather and Water Cycle ÌìÆøÓëˮѭ»· | 70 Review Test 3 | 74 Chapter 4 Science ¢Ú | 75 Unit 16 Changes in Matter ÎïÖʵı仯 | 76 Unit 17 Light and Heat ¹âºÍÈÈ | 80 Unit 18 Circulation and Respiration Ñ­»·ÓëºôÎü | 84 Unit 19 Electricity µç | 88 Unit 20 Motion and Forces Ô˶¯ºÍÁ¦ | 92 Review Test 4 | 96 Chapter 5 Mathematics | 97 Unit 21 Fractions and Decimals ·ÖÊýºÍСÊý | 98 Unit 22 Lines, Rays, Angles, and Figures Ïß¡¢ÉäÏß¡¢½Ç¶ÈºÍͼÐÎ | 102 Unit 23 Kinds of Polygons, Circles, and Triangles ¶à±ßÐΡ¢Ô²ÐκÍÈý½ÇÐεÄÖÖÀà | 106 Unit 24 Data and Graphs Êý¾ÝºÍͼ±í | 110 Review Test 5 | 114 Chapter 6 Language Visual Arts Music | 115 Unit 25 Norse Mythology ±±Å·Éñ»° | 116 Unit 26 Learning About Sentences ¾ä×ÓµÄѧϰ | 120 Unit 27 The Art of the Middle Ages ÖÐÊÀ¼ÍÒÕÊõ | 124 Unit 28 The Art of Islam, Africa, and China ÒÁ˹À¼¡¢·ÇÖÞºÍÖйúµÄÒÕÊõ | 128 Unit 29 The Elements of Music ÒôÀÖµÄÔªËØ | 132 Unit 30 Understanding Music Á˽âÒôÀÖ | 136 Review Test 6 | 140 Index | 141 Answers and Translations | 147