I have a dream that my four little children will one day live in a nation where they will not be judged by the color of their skin but by the content of their character. I have a dream today. I have a dream that my four little children will one day live in a nation where they will not be judged by the color of their skin but by the content of their character. I have a dream today. I have a dream ...... will be transformed into a situation where little black boys and black girls will be able to join hands with little white boys and white girls and walk together as sisters and brothers. I have a dream today.——Martin Luther King I have a dream ...... will be transformed into a situation where little black boys and black girls will be able to join hands with little white boys and white girls and walk together as sisters and brothers. I have a dream today.——Martin Luther King姚明姚明David Beckham David Beckham Michael JordanMichael Jordan一、三大人种一、三大人种非洲、澳洲黑色人种欧洲、亚洲白色人种自然条件的巨大差异亚洲、美洲黄色人种形成原因古代分布区域主要人种一、三大人种一、三大人种 —— 种族没有优劣之分—— 种族没有优劣之分二、人群迁徙二、人群迁徙1 、原因：材料一：（游牧民族）因为主要靠畜牧为生，所以只要发现有更为理想的地方，他们就用大牛车载起所有行李，朝那里迁移。迁移时，总是整个部落一起行动，妇女、孩子及战士全部参加。材料一：（游牧民族）因为主要靠畜牧为生，所以只要发现有更为理想的地方，他们就用大牛车载起所有行李，朝那里迁移。迁移时，总是整个部落一起行动，妇女、孩子及战士全部参加。材料二：据估计，从 17 世纪到 19 世纪，被贩卖到南北美洲的非洲人有 3500 万至 4000 万，奴隶贸易是造成非洲人员减少主要原因。材料二：据估计，从 17 世纪到 19 世纪，被贩卖到南北美洲的非洲人有 3500 万至 4000 万，奴隶贸易是造成非洲人员减少主要原因。材料三：单在（第二次世界大战）战争的前三年半...
