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Judge, fill in A correctly, and fill in B wrongly. In the Southern Song Dynasty, paper money replaced copper coins and became the main currency in circulation.
B

Analysis of test questions: This question mainly examines the use of paper money in the Southern Song Dynasty. In the early Northern Song Dynasty, Jiaozi, the earliest paper money in the world, appeared in Sichuan, China. In the Southern Song Dynasty, paper money developed into a currency parallel to copper coins. It can be seen that paper money did not replace copper coins in the Southern Song Dynasty and became the main currency in circulation. So, this question is wrong.