 
                            Asked by Mr.Haris from america | Feb. 12, 2009 17:42
                            
About:Song Dynasty
                            
                            
                            Well, i'm doing homework and i got a multiple choice question asking "which of these was NOT an invention from the tang and song dynasties? A.compass B.gunpowder C.the number zero D.paper, some one please help me!!!!!!!
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