CONTENTS 3
Unit 1 A French Boy's Adventure in Canada 3
Unit 2 Rubber 11
Unit 3 Artificial Waterways 19
Unit 4 What Makes the Weather 27
Unit 5 A Roof over Our Heads 35
Unit 6 How Well Do You See 43
Unit 7 Engineers of the Woods 51
Unit 8 A Time of Revolution 59
Unit 9 Magic 68
Unit 10 The History of Books 76
Unit 11 High Up in the Tropics 84
Unit 12 Life among the Aztecs 92
Unit 13 The Whale 100
Unit 14 Glass 108
Unit 15 The Secluded Life 116
Unit 16 Beauty on the Wing 124
Unit 17 Telling the Time 132
Unit 18 The Telephone and Its Inventor 140
Unit 19 New York's Big Ditch 148
Unit 20 Informing the World 156
Unit 21 Cats Are No Good But 164
Unit 22 The Treasure of Sanibel Island 172
Unit 23 Traveling Students 180
Unit 24 Taming the Elephant 188
Unit 25 Brave Ballerina 195
Unit 26 Rain Is Born 203
Unit 27 How Nice to Be Clean 211
Unit 28 The Pleasures of Eating 219
Unit 29 Tough Teen to Tennis Queen 227
Unit 30 The Day the Big Top Burned 236
Unit 31 Freedom from Pain 245
Unit 32 Mississippi Steamboat Days 254
Unit 33 Bring Up Children 261
Unit 34 Picnic in the Dining-room 270
Unit 35 Ghosts for Tea 279
Unit 36 Etiquette 288
Answer Key 298