what is the most serious problem facing the world?why?how can this be fixed以此为主题写一篇演讲稿!2-3分钟

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whatisthemostseriousproblemfacingtheworld?why?howcanthisbefixed以此为主题写一篇演讲稿!2-3分钟whatisthemostserious

what is the most serious problem facing the world?why?how can this be fixed以此为主题写一篇演讲稿!2-3分钟
what is the most serious problem facing the world?why?how can this be fixed
以此为主题写一篇演讲稿!2-3分钟

what is the most serious problem facing the world?why?how can this be fixed以此为主题写一篇演讲稿!2-3分钟
世界面临的最严峻的问题是什么?为什么?怎样能解决这个问题?