单选题:According to the passage, coins once had real value as curre

  • 题目分类:英语
  • 题目类型:单选题
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题目内容:
According to the passage, coins once had real value as currency because they ______. A.represented a great improvement over barter
B.permitted easy transportation of wealth
C.were made of precious metals
D.could become collector's items

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