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怎样快速学习英语 where black people had equal rights and were free to live, study and work as they wished. All his life he belived that it was right and necessary to demand changes in society if people did not have their civil rights. He believed that he could achieve that goal by peaceful actions,not by violence. On December 1,1955,Rosa Parks,a black woman, got on a bus in Alabama and sat down in the "Whites-only"section. She refused to stand up for a white man and was arrested by the police. King led a boycott of the bus company. For 381 days,black people refused to take the city buses. In the end the government lawyers in the capital said that the bus company was wrong to separate blacks from whites. Winning this case gave King national attention. He led many non-violent demonstrations against racial discrimination and the Vietnam War, during which he himself was often beaten or arrested by the police. One of these was in Birmingham,Alabama. Housing conditions for blacks in Birmingham were bad and there were few jobs for blacks. King wrote an important letter from prison. "We have waited 340 years for our rights!We find it difficult to wait. This"Wait"has almost always meant "Never'."he said. It was during the "March on Washington DC"in 1963 that he gave the speech"I Have a Dream", which inspired people of all races to fight for equality. The following year,King received the Nobel Peace Prize. In the same year,a new Civil Rights Act was passed and in 1965 水的热容相对很高。 温度改变不大， 这样形成了稳定的环境。 大多数动物和植物对于巨大的或突然的温度变化很敏感， 因而海洋是一既安全又舒适的栖息地。 海洋中的水也通过吸收或释放热量使地球的温度保持稳定。 海洋运动 由于盐度和气温变化影响水的密度， 海洋中的水一直在运动。 密度大的水下沉，密度较小的水被推到海面。 这种循环为海洋生态系统增加了能量并使营养成分四处游动。 综合技巧阅读 自然的保育院:入海口入海口就是一条河与海洋交汇的有很多水的地方。从海中来的盐水和河流中来的淡水在入海口混合在一起。这种盐水和淡水的混合形成了一具独一无二的、充满各种生物的环境-位于陆地与海洋之间的一个过渡的区域。入海口是成千上万种动植物的栖息地。很多城市和城镇入海口建起，大量的鱼在入海口被捕捞。入海口对于自然中的细小生命来说是非常重要的地方。在这里，动物可以避开很多危险从而尽情享受海洋给其带来的益处。潮汐为生态系统提供了能量，但入海口受到保护使其免于受到波浪及岛屿、泥沙的袭击。从陆地和海洋来的营养成分到达入海口。生物的密度比地球上其他栖息地要高。入海口生物的多样性是惊人的-鸟、鱼、海洋哺乳动物、贝类以及其它物种都来这和生活、捕食及繁殖。入海口还非常重要是因为他们吸引从内陆来的水中的营养成分与污染物，这样就净化了水，不幸的是，这种功能也使入海口对于环境污染特别敏感。既然入海口保护动植物不受风暴及洪水侵袭，防止侵蚀，对其保护就非常重要。最后，入海口既为人类提供了娱乐活动又提供了救育资源。我们大都喜欢在海滨钓鱼、游泳和游玩。科学家们和学生有无数的机会研究在这个地方的多种生物。入海口可通过旅游业和渔业促过经济的发展