Longago,peoplelivedonwildanimals,fruitsandotherplantsan...
問題詳情：Longago,peoplelivedonwildanimals,fruitsandotherplantsandtheydidn’tneedtousemoney.Astimepassed,familieshadmoreproducts(產品)thantheyneeded,suchasanimalsandcrops.Sotheyneededtotrade(交易)withot...