Good morning, class. Today we're discussing 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 'velocipede'. Later, in the 1860s, pedals were added to the front wheel, making it faster but also harder to balance. It wasn't until the 1880s that the 'safety bicycle' with two equal-sized wheels and a chain drive became popular. This design made cycling much safer and more accessible, especially for women. Interestingly, the bicycle's popularity led to better roads and even influenced the early automobile industry.
❓ 是什么让安全自行车在19世纪80年代变得流行?
A. 它没有踏板,推起来很轻松。
B. 它有两个大小相同的轮子和链条传动装置,因此更加安全。
C. 它有一个大前轮,能提高速度。
D. 它比脚踏车便宜。
✅ 正确答案
It had two equal-sized wheels and a chain drive, making it safer.