前言 3
推荐学习方法 4
每日检查表 8
Science 10
UNIT 01 Lung 10
UNIT 02 Day and Night 13
UNIT 03 Food Chain 16
UNIT 04 Valley 19
UNIT 05 Pearl Oyster 22
UNIT 06 Moon 25
UNIT 07 Volcano 28
UNIT 08 Raccoon 31
UNIT 09 Oxygen 34
UNIT 10 Drought 37
UNIT 11 Rain Forest 40
UNIT 12 Antenna 43
Social Studies 48
UNIT 13 Vote 48
UNIT 14 Culture 51
UNIT 15 Thomas Edison 54
UNIT 16 Festival 57
UNIT 17 Teacher 60
UNIT 18 The Rocky Mountains 63
UNIT 19 San Francisco 66
UNIT 20 Thanksgiving Day 69
UNIT 21 Bank 72
UNIT 22 International Trade 75
UNIT 23 Court 78
UNIT 24 Washington D.C． 81
Math 86
UNIT 25 Gallon 86
UNIT 26 Pentagon 89
UNIT 27 Odd and Even Numbers 92
UNIT 28 Volume 95
Art 100
UNIT 29 Landscape 100
UNIT 30 Portrait 103
Music 108
UNIT 31 Opera 108
UNIT 32 Folk Music 111
Answers 115