ContentsLesson Text Page Number17 A．W illiam Tell—a Hero 1
of SwitzerlandB．Simon Bolivar18 A．The French Revolution 19
B．Napoleon Bonaparte19 A．Egypt 37
B．The Great Pyramid 37
20 A．The Girl Who Swam 55
the English ChannelB．The Story of aWorld Champion21 A．Beethoven 76
B．Mozart 76
22 A．The Discovery 96
of GenesB．The First Vaccination23 A．Henry Kissinger 115
B．Marco Polo24 A．The Gipsies 135
B．The Gladiators 135
B．Our Sleep 158
25 A．Our Food 158
26 A．The Sea 177
B．Underwater Farming 177
27 A．Expo 70 197
B．Tomorrow s World 197
28 A．Television 217
B．Radar 217
29 A．Video Dises 234
B．The Television Industry 234
30 A．What Are UFO s? 255
B．The Bermude Triangle 255
31 A．Satellites 276
B．The Hovercraft 276
32 A．Lasers 296