提高聽力同時，你還可以了解到美國歷史上的一些重要事件。請感興趣的你一聽為快吧！
<注意>職稱、節(jié)日、組織要大寫
Students protested the war in Vietnam and President Johnson began peace negotiations. Long hair, rock and roll music and illegal drugs were visible symbols of the "counter-culture" thinking of some young people during this time. Americans became more concerned about pollution. The first Earth Day was designated in 1970. The Environmental Protection Agency was created. New laws cut down on pollution. American society was changing. Slowly, the United States was embracing its multicultural population.
學(xué)生抗議越南戰(zhàn)爭，約翰遜總統(tǒng)開始和平談判。長頭發(fā)，搖滾樂和非法毒品的“反文化”在此期間，成為一些青少年思想可見符號。美國人變得更關(guān)心污染。在1970年被指定為第一個地球日。環(huán)境保護署已創(chuàng)建。新的法律削減污染。美國社會正在發(fā)生變化。慢慢地，美國包含多元文化的人口。