前言 3
推荐学习方法 4
每日检查表 8
Science 10
UNIT 01 The Sun 10
UNIT 02 Fins 13
UNIT 03 Cactuses 16
UNIT 04 The Wheel 19
UNIT 05 The Earth's Climate 22
UNIT 06 Predators 25
UNIT 07 Gravity 28
UNIT 08 The Telescope 31
UNIT 09 Water Pollution 34
UNIT 10 The Solar System 37
UNIT 11 Seeds 40
UNIT 12 Butterflies 43
Social Studies 48
UNIT 13 Flour 48
UNIT 14 Cooperation 51
UNIT 15 Symbols 54
UNIT 16 Seasons 57
UNIT 17 The School Community 60
UNIT 18 Bridges 63
UNIT 19 The Tropics 66
UNIT 20 The Past＆the Present 69
UNIT 21 Vietnam 72
UNIT 22 Siblings 75
UNIT 23 Leadership 78
UNIT 24 Baby-sitters 81
Math 86
UNIT 25 Angles 86
UNIT 26 Charts 89
UNIT 27 Cones 92
UNIT 28 Liters 95
Art 100
UNIT 29 The Collage 100
UNIT 30 Patterns 103
Music 108
UNIT 31 The Xylophone 108
UNIT 32 Rhythm 111
Answers 115