081_21_Fractions_分数.mp4 169.9MB

043_13_The_Life_Cycle_of_an_Animal_动物的生.mp4 136.7MB

031_01_Building_Citizenship_建立公民权.mp4 218.0MB

027_27_A_World_of_Lines_and_Colors_线条与色.mp4 122.1MB

096_06_The_Mountain_States_of_the_Unit-.mp4 165.9MB

035_05_American_Federal_and_Local_Gove-.mp4 139.4MB

069_09_Ancient_Greece_古希腊.mp4 167.1MB

037_07_The_Early_Americans早期的美国人.mp4 166.5MB

024_24_Counting_Money_数钱.mp4 131.9MB

098_08_Asian_Cultures_亚洲文化.mp4 127.3MB

089_29_Elements_of_Music_音乐的元素.mp4 152.5MB

040_10_American_Independence_美国独立.mp4 157.6MB

056_26_Familiar_Sayings_常见格言与谚语.mp4 202.6MB

061_01_Laws_and_Rules_法律与规范.mp4 235.8MB

064_04_Technology_Changes_the_World科技改变.mp4 152.6MB

002_02_Home_and_School_Life_家庭与学校生活.mp4 172.9MB

033_03_Lots_of_Jobs_各种工作.mp4 151.9MB

066_06_Geography_Skills_地理技能.mp4 172.6MB

041_11_Living_and_Nonliving_Things_生物与.mp4 161.8MB

046_16_Insects_昆虫.mp4 141.2MB

052_22_Time_时间.mp4 117.8MB

044_14_Plants_植物.mp4 164.6MB

036_06_Native_Americans_and_Their_Cult-.mp4 173.8MB

103_13_Heredity_遗传.mp4 137.0MB

075_15_Earth’s_Rocks_and_Soil_地球的岩石和土壤.mp4 157.2MB

026_26_Types_of_Writing_写作的类型.mp4 169.3MB

032_02_Moving_to_a_New_Community_移居新国家.mp4 166.2MB

028_28_A_World_of_Paintings_绘画的世界.mp4 144.4MB

048_18_The_Human_Body_人体.mp4 189.3MB

029_29_Instruments_and_Their_Families.mp4 151.0MB

082_22_Geometry几何学.mp4 174.3MB

073_13_Food_Chains_食物链.mp4 179.9MB

054_24_Multiplication_and_Division_乘法与除.mp4 113.1MB

042_12_Kinds_of_Animals动物的种类.mp4 177.8MB

105_15_The_Weather_and_Water_Cycle_天气与水.mp4 179.2MB

071_11_A_World_of_Plants_植物的世界.mp4 188.7MB

088_28_Creating_Designs_创造设计.mp4 127.2MB

038_08_The_Europeans_Come_to_the_New_W-.mp4 204.3MB

092_02_The_Southwest_Region_of_the_Uni-.mp4 151.2MB

039_09_The_English_Come_to_American_英国人.mp4 176.9MB

030_30_A_World_of_Music_音乐的世界.mp4 119.8MB

074_14_Ecosystems_生态系统.mp4 190.6MB

070_10_Ancient_Rome_古罗马.mp4 177.8MB

025_25_Read_and_Write_阅读和写作.mp4 176.8MB

059_29_Many_Kinds_of_Music_音乐的种类.mp4 195.9MB

086_26_Learning_About_Language_学习语言.mp4 173.5MB

102_12_Classifying_Living_Things_生物的分类.mp4 137.6MB

062_02_Earning,_Spending,_and_Saving_收入.mp4 165.1MB

034_04_The_Geography_of_the_United_Sta-.mp4 212.8MB

065_05_Living_in_Different_Climates_生活在.mp4 147.2MB

100_10_The_Civil_War_美国南北战争.mp4 167.2MB

072_12_A_World_of_Animals_动物的世界.mp4 143.7MB

053_23_Solid_Figures_and_Plane_Figures.mp4 171.5MB

097_07_Mountains,_Rivers,_and_Deserts.mp4 151.2MB

080_20_The_Senses各种感官.mp4 147.2MB

001_01_Qur__communty_社会与环境.mp4 224.4MB

003_03_Different_Cultures_and_Holidays.mp4 132.2MB

099_09_Europe_in_the_Middle_Ages_中世纪的欧洲.mp4 149.6MB

104_14_The_History_of_the_Earth_地球的历史.mp4 154.6MB

094_04_The_Northeast_Region_of_the_Uni-.mp4 202.1MB