文章结构:
1Why Switzerland has maintained a peaceful coexistence since its establishment as a federal state in 1848?
2The study suggests that these physical or geographical barriers allow for partial autonomy among disparate groups within a single country and thus foster peace.
evidence:physical separations
有些人认为政治边界可以保持稳定,但结果并不是这样
阅读答案:CBEDD