题目：
According to the passage, inland waterway travel was most popular in the early 1800s.
答案：
参考答案：对
解析：
[分析]： 数字信息的找寻和判断。 根据原文…in the early 19th century in the United States．At that time，inland waterways provided North America’s most popular form of long-distance transportation可知在19世纪早期内陆水运系统是北美最流行的长途运输方式。由此可见题干的说法与原文相符，因此是正确的。[解题关键] 正确掌握代词的指代关系是解题的关键。原文中that time便指前面的the early 19th century。
