Good morning, everyone. 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, creating the 'velocipede.' However, this design was very uncomfortable due to its solid rubber tires and rough ride. It wasn't until the 1880s that the 'safety bicycle' with two equal-sized wheels and a chain drive became popular, making cycling much safer and more accessible to the general public.
❓ An toàn xe đạp đã cải tiến chính so với các thiết kế trước đó là gì?
A. A. Nó có bàn đạp gắn vào bánh trước.
B. B. Nó có hai bánh xe bằng nhau và bộ truyền động xích.
C. C. Nó nhẹ hơn và rẻ hơn để sản xuất
D. D. Nó có lốp cao su đặc để di chuyển êm ái hơn.
✅ 正确答案
B. It had two equal-sized wheels and a chain drive