wealth reference which or through because into and in at paper fund In ancien

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问题     wealth    reference    which    or    through    because
    into      and          in       at    paper      fund
    In ancient times【C1】________was measured and exchanged tangibly,【C2】________things that could be touched; foods, tools and precious metals and stones. Then the barter system was replaced by coins,【C3】________still had real value since they were pieces of rare metal. Coins were followed by fiat money,【C4】________notes that have value only【C5】________everyone agrees to accept them.
    Today electronic monetary systems are gradually being introduced that will transform money【C6】________even less tangible forms, reducing it to arrays of "bits and bytes",【C7】________units of computerized information, whizzing between machines【C8】________the speed of light. Already, electronic【C9】________transfer allows money to be instantly sent and received by different banks, companies, and countries【C10】________computers and telecommunications devices.
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