题目内容
4.听第10段材料,回答第18至20题.18.What was the first tool for exchange in China?
A.Shells.B.Knives.C.Round coins.
19.Where did the first silver coins appear?
A.In Greece.B.In Turkey.C.In Rome.
20.Why did the paper money disappear in 1455in China?
A.European countries didn't admit the money.B.It was easily worn.
C.It caused some economic risks.
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