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, but this design was unstable 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.
❓ 是什么让安全自行车比早期设计更受欢迎？
A. A. 它有一个更大的前轮。
B. B. 它更轻便，生产成本也更低。
C. C. 它采用了链传动和等尺寸车轮以确保安全。
D. D. 它的前轮上装有踏板。
✅ 正确答案
C. It used a chain drive and equal-sized wheels for safety.