Today's lecture is about the history of the bicycle. The first bicycle, invented in the early 19th century, had no pedals and was pushed along by the rider's feet. This design was called a 'hobby horse'. Later, in the 1860s, pedals were added to the front wheel, creating the 'velocipede'. However, it was not until the 1880s that the 'safety bicycle' with two equal-sized wheels and a chain drive became popular. This design made cycling much safer and more comfortable, leading to a boom in bicycle use among the general public, especially for leisure and commuting.
❓ 根据讲座内容，安全自行车广受欢迎的一个关键特点是什么？
A. A. 它有一个非常大的前轮。
B. B. 它的前轮上装有踏板。
C. C. 它有两个大小相同的轮子和一个链条传动装置。
D. D. 它比现代自行车更轻更快。
✅ 正确答案
C. It had two equal-sized wheels and a chain drive.