Longago,peoplelivedonwildanimals,fruitsandotherplantsan...
问题详情：Longago,peoplelivedonwildanimals,fruitsandotherplantsandtheydidn’tneedtousemoney.Astimepassed,familieshadmoreproducts(产品)thantheyneeded,suchasanimalsandcrops.Sotheyneededtotrade(交易)withot...