Today we're going to discuss the history of the bicycle. Although many people think the bicycle was invented in the 19th century, early prototypes appeared in the 18th century. The first two-wheeled vehicle, called a 'velocipede', was created in 1817 by a German inventor. However, it had no pedals; riders pushed their feet against the ground. In the 1860s, French inventors added pedals to the front wheel, which made riding faster but also more dangerous. It wasn't until the 1880s that the 'safety bicycle' with a chain drive and equal-sized wheels became popular, making cycling accessible to everyone.
❓ 是什么让自行车在19世纪80年代变得更安全、更受欢迎?
A. A. 在前轮上加装踏板
B. B. 链传动和等径轮的发明
C. C. 第一辆两轮车的诞生
D. D. 使用橡胶轮胎以增强抓地力
✅ 正确答案
B. The invention of the chain drive and equal-sized wheels