Good morning, everyone. Today we're going to discuss the history of the bicycle. Now, you might be surprised to learn that the first bicycle, invented in the early 19th century, had no pedals. It was propelled by pushing your feet against the ground. This design, called a 'hobby horse,' was popular but inefficient. Then, in the 1860s, the addition of pedals to the front wheel made riding faster, but it was also dangerous because riders often fell forward. It wasn't until the late 1880s that the 'safety bicycle' with a chain drive and two equal-sized wheels was introduced, which greatly improved stability and paved the way for modern bicycles.
❓ 前轮装有踏板的白行车设计存在的主要问题是什么?
A. 它太慢了,不实用。
B. 骑手们常因不稳定而向前摔倒。
C. 制造成本太高了。
D. 踩踏板需要耗费太多体力。
✅ 正确答案
Riders frequently fell forward due to instability.