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• file:105_15_The_Weather_and_Water_Cycle_天气与水.mp4
• file:104_14_The_History_of_the_Earth_地球的历史.mp4
• file:103_13_Heredity_遗传.mp4
• file:102_12_Classifying_Living_Things_生物的分类.mp4
• file:101_11_Inquiry_Skills_and_Science_Tools.mp4
• file:100_10_The_Civil_War_美国南北战争.mp4
• file:099_09_Europe_in_the_Middle_Ages_中世纪的欧洲.mp4
• file:098_08_Asian_Cultures_亚洲文化.mp4
• file:097_07_Mountains,_Rivers,_and_Deserts.mp4
• file:096_06_The_Mountain_States_of_the_Unit-.mp4