读前思考Pre-reading Questions 包卫卫卫巧卫巧卫卫卫卫卫卫卫巧卫巧卫巧卫卫卫巧卫巧卫巧卫巧卫巧卫巧卫巧卫 1.众所周知，当今的美国是一个移民大国。但是 你知道吗，古代中国也曾有过多次大规模的移 民？请你分析一下历史上中国人为什么要移 民？ It's known that today's America is a nation of migration,but do you know that there were also several large-scale migrations in ancient China?Why did Chinese people need to migrate in history?读前思考 Pre-reading Questions 1. 众所周知，当今的美国是一个移民大国。但是 你知道吗，古代中国也曾有过多次大规模的移 民？请你分析一下历史上中国人为什么要移 民？ It’s known that today’s America is a nation of migration, but do you know that there were also several large-scale migrations in ancient China? Why did Chinese people need to migrate in history?