参考答案：错

解析：[听力原文]About 200 years ago, about 95 percent of Americans lived on farms. There were only 24 urban areas, all of which were under 100,000 people. By mid-20th century, things had changed dramatically: 70 percent of the American public lived in urban areas. From 5 percent to 70 percent ! There were over 6,000 cities or urban areas.

[分析]： 数字信息的找寻和判断。 根据原文By mid-20th century，things had changed dramatically：70 percent of the American public lived in urban areas. From 5 percent to 70 percent!由此可知，美国经过200多年的发展，城市人口迅速增长，如今70％的美国人在城市中居住。因此可判断，题干的说法与原文不符，是错误的。[解题关键] 注意有关信息的收集，并根据数字进行简单判断。