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Lesson 1 1

Text:Light 1

Reading Materials 7

Ⅰ．How Light Travels 7

Ⅱ．The Sun 10

Lesson 2 14

Text:Gravitation 14

Reading Materials 23

Ⅰ．Movement of the Earth 23

Ⅱ．How Big Is the Universe? 26

Lesson 3 29

Text:Madame Curie and Radium 29

Reading Materials 36

Ⅰ．Marie Curie,Woman-Scientist 36

Ⅱ．The Great Scientist Sir Isaac Newton 39

Lesson 4 43

Text:Oil in the Earth 43

Reading Materials 50

Ⅰ．The Energy Gap 50

Ⅱ．How Does Gasoline Come From? 53

Lesson 5 57

Text:Satellites 57

Reading Materials 67

Ⅰ．Satellites and Acceleration 67

Ⅱ．Satellites-Up and Down 70

Lesson 6 74

Text:The Use of Radar 74

Reading Materials 83

Ⅰ．What Is Radar? 83

Ⅱ．The Use of Radar 86

Lesson 7 90

Text:Atoms and Elements 90

Reading Materials 101

Ⅰ．Atoms and Molecules 101

Ⅱ．Who Discovered the Atom? 104

Lesson 8 108

Text:Electricity 118

Reading Materials 119

Ⅰ．The Coming of Electricity 119

Ⅱ．Heat and Electricity 122

Lesson 9 125

Text:Hovercraft-A Flying Ship 125

Reading Materials 134

Ⅰ．Saucers in the Sky 134

Ⅲ．Electric Trains 136

Lesson 10 142

Text:Fresh Water Factories 142

Reading Materials 152

Ⅰ．How Does Water Change to Ice? 152

Ⅱ．The Mighty Raindrop 155

Lesson 11 159

Text:The Speed of Sound 159

Reading Materials 169

Ⅰ．Sound 169

Ⅱ．Sound 171

Lesson 12 174

Text:Television 174

Reading Materials 185

Ⅰ．Pictures Through the Air(Part One) 185

Ⅱ．Pictures Through the Air(Part Two) 191

Lesson 13 196

Text:The Migration of Birds 196

Reading Materials 206

Ⅰ．A House and Garden-for Birds 206

Ⅱ．How Do Birds Find Their Way Home? 209

Lesson 14 213

Text:As Light as Air 213

Reading Materials 221

Ⅰ．UFOs 221

Ⅱ．Flying Saucers 224

Lesson 15 227

Text:Albert Einstein 227

Reading Materials 237

Ⅰ．Thomas Alva Edison 237

Ⅱ．Albert Schweitzer 241

Vocabulary 245