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  Over80percentofmankind’sdietisprovidedbytheseedsofles...
問題詳情:  Over80percentofmankind’sdietisprovidedbytheseedsoflessthanadozenplantspecies.Buttheamountandvarietyofcropproductionhasbeenincreasingallthetime.  ____56____Forexample,Egyptianssettledalo...
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