出版說明 To the Teacher Steps for the Reader Vocabulary Words and Definitions 6-12 Concept Ⅰ:Change Is a Part of Life The Earl Was Busy Do You Ever Wear a Mask? Trash or Treasures A Sky Full of Fish Busy as a Beaver Old and New Ways to Add The squirrel and the Acorn Pet from the Stone Age A Horse No Bigger Than a Cat The Smallest Bird Room to Grow The Frog That Changes Color Let's Trade A Thread 100 Miles Long A Land Almost Like Home Walking,Talking Ads Can You Vote? Old Ways and New Pots The Tree That Was Always Different Living Up High The Leaf That Tells a Story The Fish on the Mountain A River of Ice The river That Dug a Canyon Volcano in a Field How Cities Began A Bag of Bugs Are You a Little Doll? Please Pass the Pepper Send a Message When Schools Were Different Gold from Making Pants A Stone for a Sheep The Year the Barn Burned Down The Time of the Falling Leaves Look for a Sign A Leg Walking Right How the Rabbit Got Its Shape Concept Ⅱ:Some Changes Are Fast,Some Changes Are Slow ……
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