Good morning, everyone. Today we're going to discuss 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. It was called a 'hobby horse'. Later, in the 1860s, pedals were added to the front wheel, creating the 'velocipede'. However, this design was uncomfortable and difficult to ride. It wasn't until the 1880s that the 'safety bicycle' with a chain drive and two equal-sized wheels became popular, making cycling much safer and more accessible to the general public.
❓ 安全自行车广受欢迎的一个关键特点是什么？
A. A. 它的前轮上装有踏板。
B. B. 它有两个大小相同的轮子和一个链条传动装置。
C. C. 它是由骑行者用脚推动前进的。
D. D. 这是有史以来发明的第一辆自行车。
✅ 正确答案
B. It had two equal-sized wheels and a chain drive.