Today is Saturday. In the morning, Xiaoyong is sleeping, but the phone rings. He wakes up from his dream. He gets up and goes to the park near his home. He is doing exercise, but it starts to rain. He has to go home. He is doing his homework at home, but the bell rings.

    In the afternoon, Xiaoyong is riding his bike, but suddenly(突然)a little dog runs to him. He falls off his bike. He is so sad.

我国自古以来就是一个统一的多民族国家，正确处理好民族关系和维护祖国统一是我国十分重视的问题。结合所学知识，回答下列问题

材料一：江泽民同志曾说：我们伟大的中华民族，是由五十多个民族构成的。在我们祖国的大家庭里，各个民族的关系是平等、团结、互助的社会主义新型民族关系，汉族离不开少数民族，少数民族离不开汉族，少数民族之间也相互离不开。

材料二：

材料三:2014年3月1日21时20分左右在中华人民共和国云南省昆明市昆明火车站发生的一起由新疆分裂势力组织策划的无差别砍杀暴力恐怖事件,造成严重死伤.

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