（）Paper-makingis__________of

请选择ABCD-I0x'o9x,@7o9]*` Paper-making is __________ of ancient China..[*q/C-U5F7g'u:X3Q)o5f9[,p4w7F*}

A. one of greatest inventor.[*q/C-U5F7g'u:X3Q)o5f9[,p4w7F*}

B. one of the greatest inventors.[*q/C-U5F7g'u:X3Q)o5f9[,p4w7F*}

C. one of greatest invention.[*q/C-U5F7g'u:X3Q)o5f9[,p4w7F*}

D. one of the greatest inventions.[*q/C-U5F7g'u:X3Q)o5f9[,p4w7F*}