Today's lecture is about 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. This design was called a 'hobby horse'. Later, in the 1860s, pedals were added to the front wheel, creating the 'velocipede'. However, it was not 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 comfortable, leading to a boom in bicycle use among the general public, especially for leisure and commuting.
❓ Theo bài giảng, đặc điểm chính nào của 'xe đạp an toàn' đã khiến nó trở nên phổ biến?
A. A. Nó có một bánh trước rất lớn.
B. B. Nó có bàn đạp gắn vào bánh trước.
C. C. Nó có hai bánh xe bằng nhau và bộ truyền động xích.
D. D. Nó nhẹ hơn và nhanh hơn xe đạp hiện đại.
✅ 正确答案
C. It had two equal-sized wheels and a chain drive.