���] �–|�� �x������С�W(xu��)�n���W(xu��)�����~�R4

Ŀ� Introduction How to Use This Book Chapter 1 Social Studies History and Geography �� | 9 Unit 01 The West Region of the United States ���������؅^(q��) | 10 Unit 02 The Southwest Region of the United States �������ϲ��؅^(q��) | 14 Unit 03 The Southeast Region of the United States �����|�ϲ��؅^(q��) | 18 Unit 04 The Northeast Region of the United States �����|�����؅^(q��) | 22 Unit 05 The Midwest Region of the United States �����������؅^(q��) | 26 Review Test 1 | 30 Chapter 2 Social Studies History and Geography �� | 31 Unit 06 The Mountain States of the United States ����ɽ�^(q��)�T�� | 32 Unit 07 Mountains, Rivers, and Deserts of the World �����ϵ�ɽ����������ɳĮ | 36 Unit 08 Asian Cultures �����Ļ� | 40 Unit 09 Europe in the Middle Ages �����o(j��)�ĚW�� | 44 Unit 10 The Civil War �����ϱ���(zh��n)�� | 48 Review Test 2 | 52 Chapter 3 Science �� | 53 Unit 11 Inquiry Skills and Science Tools ̽�����g(sh��)�c�ƌW(xu��)���� | 54 Unit 12 Classifying Living Things ����ķ�� | 58 Unit 13 Heredity �z�� | 62 Unit 14 The History of the Earth ����Ěvʷ | 66 Unit 15 The Weather and Water Cycle ����cˮѭ�h(hu��n) | 70 Review Test 3 | 74 Chapter 4 Science �� | 75 Unit 16 Changes in Matter ���|(zh��)��׃�� | 76 Unit 17 Light and Heat ��͟� | 80 Unit 18 Circulation and Respiration ѭ�h(hu��n)�c���� | 84 Unit 19 Electricity � | 88 Unit 20 Motion and Forces �\�Ӻ��� | 92 Review Test 4 | 96 Chapter 5 Mathematics | 97 Unit 21 Fractions and Decimals ��?j��n)?sh��)��С��(sh��) | 98 Unit 22 Lines, Rays, Angles, and Figures �����侀���ǶȺ͈D�� | 102 Unit 23 Kinds of Polygons, Circles, and Triangles ��߅�����A�κ������εķN� | 106 Unit 24 Data and Graphs ��(sh��)��(j��)�͈D�� | 110 Review Test 5 | 114 Chapter 6 Language Visual Arts Music | 115 Unit 25 Norse Mythology ���W��Ԓ | 116 Unit 26 Learning About Sentences ���ӵČW(xu��)��(x��) | 120 Unit 27 The Art of the Middle Ages �����o(j��)ˇ�g(sh��) | 124 Unit 28 The Art of Islam, Africa, and China ��˹�m�����޺��Ї���ˇ�g(sh��) | 128 Unit 29 The Elements of Music ������Ԫ�� | 132 Unit 30 Understanding Music �˽����� | 136 Review Test 6 | 140 Index | 141 Answers and Translations | 147