跟美国学生同步学科学-4

01 Beaver Dams 02 The Green Anaconda 03 Animals in Winter 04 Venus 05 Review (Lessons 1− 4) 06 Bison 07 Our Solar System. 08 The African Penguin 09 The Komodo Dragon 10 Review (Lessons 6−9) 11 The Jaguar 12 Germs. 13 The Whale Shark 14 The Gila Monster. 15 Review (Lessons 11− 14). 16 The Walrus 17 Glaciers 18 The Great Horned Owl 19 Planet Jupiter 20 Review (Lessons 16−19) 21 The Galapagos Tortoise. 22 The Chaparral Ecosystems 23 Ecology. 24 Endangered Species. 25 Review (Lessons 21− 24) 26 Rainforest Ecosystems 27 Bats. 28 What’s Eating You? 29 Where Are You? 30 Review (Lessons 26−29) 31 The Wild Turkey 32 The Three-toed Sloth 33 Hide and Seek 34 The Black Rhino. 35 Review (Lessons 31−34) 36 The Prairie Dog 37 Valuable Resources 38 Nails and Screws. 39 The Amazing Wheelbarrow 40 Review (Lessons 35−39) 41 The Grizzly Bear 42 Neptune. 43 Australian Green Tree Frog 44 Galaxies. 45 Review (Lessons 41−44) 46 Planet Earth 47 Earthquakes.. 48 The Hale-Bopp Comet 49 The Blue Morpho Butterfly 50 Review (Lessons 46−49)