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