Today we're going to discuss the history of the bicycle. The first bicycle, invented in the early 19th century, had no pedals; riders pushed their feet along the ground. Later, pedals were added to the front wheel, which made the ride faster but dangerous, as the front wheel became very large. By the 1880s, the 'safety bicycle' appeared with two equal-sized wheels and a chain drive, making it much safer and more popular. Interestingly, this design also allowed women to ride comfortably, leading to a significant social change in clothing and mobility.
❓ 安全自行车相较于早期设计的一个主要优势是什么？
A. A. 由于前轮较大，速度更快。
B. B. 由于车轮尺寸相同且采用链条传动，它更加安全。
C. C. 它更轻便，更容易携带。
D. D. 它比其他自行车需要的维护更少。
✅ 正确答案
B. It was safer due to its equal-sized wheels and chain drive.