蒙古国是中国北部邻国 ,面积 1 5 0多万平方公里 ,人口约 1 0 0余万 ,中蒙边界线长达4672公里。半个世纪前 ,这块称“外蒙古”的地方 ,还是中国领土的一部分。高中课本 ,对这个问题已有所叙述 ,但美中尚有不足。在教学实践中 ,常有使学生感到迷惑、教师感到尴尬之处 ,主要集中 Mongolia is a neighboring country in northern China, with an area of ​​more than 150 million square kilometers, a population of about 10 million, and the Sino-Mongolian border line is 4,672 kilometers long. Half a century ago, this place called “Outer Mongolia” was part of Chinese territory. High school textbooks have already been described on this issue, but the United States and China still have shortcomings. In teaching practice, students are often confused and teachers feel embarrassed.