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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