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 very uncomfortable due to its solid rubber tires and rough ride. It wasn't until the 1880s that the 'safety bicycle' with two equal-sized wheels and a chain drive became popular, making cycling much safer and more accessible to the general public.
❓ 安全自行车相较于早期设计的主要改进是什么?
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. 它更轻便,生产成本也更低。
D. D. 它装有实心橡胶轮胎,以提供更平稳的行驶体验
✅ 正确答案
B. It had two equal-sized wheels and a chain drive