Today we're going to discuss the history of the bicycle. Although many people credit Karl Drais with inventing the first bicycle in 1817, his 'running machine' had no pedals. It was propelled by pushing your feet against the ground. Later, in the 1860s, pedals were added to the front wheel in France. However, these early bicycles were difficult to ride because of their heavy wooden frames and iron tires. It wasn't until the 1880s that the 'safety bicycle' with two equal-sized wheels and a chain drive was introduced, making cycling much safer and more popular. This design became the basis for modern bicycles.
❓ Xe đạp an toàn trong những năm 1880 đã có cải tiến chính nào?
A. A. Nó có khung gỗ nhẹ hơn.
B. B. Nó sử dụng bộ truyền động xích và các bánh xe có kích thước bằng nhau.
C. C. Đây là chiếc xe đạp đầu tiên có bàn đạp.
D. D. Nó được đẩy bằng cách dùng chân đạp xuống đất.