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
问题描述：
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
答
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?