题目内容：
西藏自古以来就是中国不可分割的一部分。自十三世纪中叶西藏地区正式归人元朝版图后，中国虽然经历了几代王朝的兴替，多次更换中央政权，但西藏一直处于中央政府的管辖之下。元朝设立的管理西藏事务的中央机构是（ ）。 
参考答案：
答案解析：
单选题：西藏自古以来就是中国不可分割的一部分。自十三世纪中叶西藏地区正式归人元朝版图后，中国虽然经历了几代王朝的兴替，多次更换中
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