Unit1 Mister Imagination 1
Unit2 High Up in the Tropics 9
Unit3 Education Out of School 18
Unit4 Taming the Elphant 26
Unit5 A French Boy's Adventure in Canada 34
Unit6 Telling the Time 43
Unit7 More People and More Products 51
Unit8 Useful Companions 60
Unit9 A Time of Revolutions 69
Unit10 Engineers of the Woods 78
Unit11 The Telephone and Its Inventor 86
Unit12 Brave Ballerina 95
Unit13 The Day the Big Top Burned 104
Unit14 The Secluded Life 113
Unit15 The lITTLE pEOPLE 121
Unit16 Mississippi Steamboat Days 129
Unit17 Tough Teen to Tennis Queen 138
Unit18 Freedom from Pain 147
Unit19 Never Trust Appearance 156
Unit20 Glass 164
Unit21 Informing the World 172
Unit22 Life among the Aztecs 181
Unit23 Traveling Students 189
Unit24 How Nice to Be Clean 197
Unit25 Cats Are No Good But 205
Unit26 Bringing Up Children 213
Unit27 Ghosts for Tea 222
Unit28 New York's Big Ditch 231
Unit29 Picnic in the Dining-room 239
Unit30 Etipuette 248
Answer Key(另附) 259