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  Over80percentofmankind’sdietisprovidedbytheseedsofles...

  •   Over80percentofmankind’sdietisprovidedbytheseedsofles...

  • 問題詳情：  Over80percentofmankind’sdietisprovidedbytheseedsoflessthanadozenplantspecies.Buttheamountandvarietyofcropproductionhasbeenincreasingallthetime.  ____56____Forexample,EgyptianssettledalongtheRiverNile,theChineseempirealongtheYellowRiver...
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