確實是玉米，紅薯的引入中國後，中國人口才大幅增長，是因為這兩種作物產量高，皮實。稻麥產量低，不好養。

來源: newnewid888 於 2014-04-22 18:38:15 [舊帖] [給我悄悄話] 本文已被閱讀：次

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