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非洲国家种植粮食，为什么会选择大量的木薯？这究竟有什么原因？
非洲人简直太奇怪了，别人种粮食都是以谷物为主，他们却集体大量种植木薯。非洲人为什么要大量种植木薯？这究竟有什么原因？
不可思议的科普34/71
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