题目：According to the passage coins once had real value as curr

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题目:According to the passage coins once had real value as currency because they          

题型:单选题

学校:国家开放大学 形成性考核

选项:

A.were made of precious metals

B.represented a great improvement over barter

C.permitted easy transportation of wealth

D.could become collector's items

答案:A

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关键词：because，improvemen，passage，A.were，precious，become

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