According to the passage, which of the following was the earliest kind of exchange of wealth?a.Bartered foodb.Coin currencyc.Flat moneyd.Intangible forms

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According to the passage, which of the following was the earliest kind of exchange of wealth?

a.Bartered food
b.Coin currency
c.Flat money
d.Intangible forms

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综合英语（1）

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