若$\sqrt{{\left(x-2\right)}^2}$=2﹣x，则x的取值范围是____；若3+$\sqrt{7}$的小数部分是m，3﹣$\sqrt{7}$的小数部分是n，则m+n=____．

阅读下面诗歌，回答（1）～（4）题。

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通过让出部分国家主权，进行国家间的联合，达成区域和平，促进人类文明进步，是一项重大尝试。二战后，这一“尝试”的典型事例是（    ）