Smart Science：跟美國(guó)學(xué)生同步學(xué)科學(xué)（彩色英文版 Grade 4）

01 Beaver Dams........................................................................001 02 The Green Anaconda..........................................................003 03 Animals in Winter...............................................................006 04 Venus....................................................................................009 05 Review (Lessons 1-4)........................................................011 06 Bison.....................................................................................013 07 Our Solar System................................................................016 08 The African Penguin...........................................................018 09 The Komodo Dragon..........................................................020 10 Review (Lessons 6-9).........................................................023 11 The Jaguar............................................................................025 12 Germs...................................................................................027 13 The Whale Shark.................................................................030 14 The Gila Monster................................................................033 15 Review (Lessons 11-14).....................................................036 16 The Walrus...........................................................................038 17 Glaciers.................................................................................041 18 The Great Horned Owl......................................................044 19 Planet Jupiter.......................................................................046 20 Review (Lessons 16-19).....................................................048 21 The Galapagos Tortoise......................................................050 22 The Chaparral Ecosystems................................................052 23 Ecology.................................................................................055 24 Endangered Species............................................................057 25 Review (Lessons 21-24).....................................................060 26 Rainforest Ecosystems........................................................062 27 Bats........................................................................................065 28 What's Eating You?.............................................................068 29 Where Are You?...................................................................070 30 Review (Lessons 26-29).....................................................072 31 The Wild Turkey.................................................................074 32 The Three-toed Sloth..........................................................076 33 Hide and Seek.....................................................................078 34 The Black Rhino..................................................................080 35 Review (Lessons 31-34).....................................................082 36 The Prairie Dog...................................................................084 37 Valuable Resources.............................................................086 38 Nails and Screws.................................................................089 39 The Amazing Wheelbarrow..............................................091 40 Review (Lessons 35-39)....................................................094 41 The Grizzly Bear.................................................................096 42 Neptune................................................................................099 43 Australian Green Tree Frog...............................................101 44 Galaxies................................................................................103 45 Review (Lessons 41-44).....................................................105 46 Planet Earth.........................................................................107 47 Earthquakes.........................................................................109 48 The Hale-Bopp Comet........................................................111 49 The Blue Morpho Butterfly...............................................113 50 Review (Lessons 46-49).....................................................115