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.
❓ Vấn đề chính của thiết kế xe đạp có bàn đạp gắn ở bánh trước là gì?
A. Nó quá chậm để có thể thực tế.
B. Người lái thường xuyên ngã về phía trước do mất thăng bằng.
C. Việc sản xuất nó quá đắt đỏ.
D. Đạp xe đòi hỏi quá nhiều sức lực.
✅ 正确答案
Riders frequently fell forward due to instability.