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【单选题】
我国古代人民的“四大发明”,是中华民族对世界文明发展的重大贡献。这些发明中在北宋时期发明的是( ) 1造纸术 2火药 3活字印刷术 4指南针A.
①③
B.
③④
C.
①②
D.
①④
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举一反三
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