Good morning, class. Today we're going to discuss the history of the bicycle. Now, many people think the bicycle was invented in the 19th century, but in fact, a primitive version appeared in 1817, invented by a German baron named Karl von Drais. His machine, called the 'running machine,' had no pedals; riders pushed their feet against the ground. It wasn't until the 1860s that pedals were added in France. However, the first practical and widely popular design came in the 1880s with the 'safety bicycle,' which featured equal-sized wheels and a chain drive. This design made cycling much safer and more comfortable, leading to a boom in popularity.
❓ 根据讲座内容，自行车最早是在什么时候开始广泛流行的？
A. 1817年，跑步机被发明之时。
B. 在19世纪60年代，脚踏板被添加到了自行车上。
C. 在19世纪80年代，随着安全自行车的问世。
D. 在19世纪，但未提及具体日期。
✅ 正确答案
In the 1880s, with the introduction of the safety bicycle.