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Unit One　Human Beings 1

Lesson 1　Body Structure and Function 1

Lesson 2　Senses 5

Lesson 3 Nutrition 8

Lesson 4　Health 12

Lesson 5　First Aid and Safety 16

Unit Two　Animals 21

Lesson 1 Classification 21

Lesson 2　Reptiles 25

Lesson 3 Mammals 28

Lesson 4　Water Animals 30

Lesson 5 Resources 32

Unit Three　Plants 34

Lesson 1　Seeds and Reproduction 34

Lesson 2 Roots and Stems 37

Lesson 3　Leaves 39

Lesson 4　Fun with Plants 41

Unit Four　Physical World 43

Lesson 1 Matter 43

Lesson 2　Water 45

Lesson 3　Air 47

Lesson 4　Fire and Heat 49

Lesson 5　Light and Color 51

Unit Five　Weather 54

Lesson 1 Wind 54

Lesson 2　Clouds and Fogs 56

Lesson 3 Rain and Rainbows 59

Lesson 4 Snow 62

Lesson 5　Thunder and Lightning 64

Unit Six　Ecology 66

Lesson 1　Ecosystem 66

Lesson 2　Conservation 69

Lesson 3　Pollution 73

Lesson 4　Pollution Solutions 76

Unit Seven　Earth and Space 79

Lesson 1 Universe 79

Lesson 2　Solar System 82

Lesson 3 Earth Crust 85

Lesson 4　Gravity 88

Lesson 5　Space Travel 90

Unit Eight　Science in Sports 93

Lesson 1　Computer in Sports 93

Lesson 2　Timing Technology in Sports 96

Lesson 3　Materials in Sports 98

Lesson 4　Science in Sports Broadcast 100

Unit Nine　Social Concerns 102

Lesson 1　Daily Problems:Health and Illness 102

Lesson 2 Educational Systems at Home and Abroad 107

Lesson 3　Global Problems:Famine,Overpopulation and Pollution 112

Lesson 4　Cyber Space and Our Life 115

Lesson 5　Global Science Holidays 120

Unit Ten　Flora and Fauna 125

Lesson 1　Classification 125

Lesson 2　Methods of Reproduction 128

Lesson 3　Fun with Flora and Fauna 132

Lesson 4　Human Beings and Plants 136

Lesson 5　Human Beings and Animals 139

Unit Eleven　Subjects of Science 142

Lesson 1 Mathematics 142

Lesson 2　Physics 147

Lesson 3　Chemistry 151

Lesson 4　Astronomy 154

Lesson 5　Energy 158

Unit Twelve　Sports and Entertainment 163

Lesson 1 Classification of Spots Games 163

Lesson 2　Some Popular Spots:Origin,Rules and Status Quo 167

Lesson 3 Functions of Spots 175

Lesson 4　Spots Science and Technology 177

Unit Thirteen Natural Phenomena:Observation and Interpretation 182

Lesson 1 Why does the Apple Fall down onto the Earth? 182

Lesson 2　How is a Rainbow Formed? 186

Lesson 3 Why does the Bottle Break When Water Turns into Ice? 190

Lesson 4　Why is Temperature Higher in a City than in Its Suburb? 192

Unit Fourteen Natural Disasters and Ways of Salvation 195

Lesson 1　Earthquake 195

Lesson 2 Fire 200

Lesson 3 Flood 203

Lesson 4　Drowning 206

Unit Fifteen　Story of and about the Olympic Games 210

Lesson 1　Brief History of the Olympics 210

Lesson 2　Nuts and Bolts of the Olympic Games 214

Lesson 3　China and the Games 218

Lesson 4　The Beijing 2008 Olympics in Focus 221

Unit Sixteen　The Updated Achievements of Natural Sciences 229

Lesson 1　Computer Technology 229

Lesson 2　Gene Studies and Its Promising Uses 234

Lesson 3　Cloning and Its Great Influence 240

Lesson 4　Space Exploration 245

Lesson 5 Ecosystem and the Existence of Human Beings 248