Good morning. Today we're going to discuss the history of the bicycle. The first two-wheeled vehicle was invented in 1817 by a German baron, Karl von Drais. It was called a 'running machine' because riders pushed their feet against the ground. However, it wasn't until the 1860s that pedals were added, in France. By the 1880s, the 'safety bicycle' emerged, with equal-sized wheels and a chain drive. Interestingly, the popularity of bicycles led to improvements in road surfaces and even influenced women's fashion, as women began wearing more practical clothing for cycling. So, while the basic design has changed little since then, the social impact was huge.
❓ Theo bài giảng, ảnh hưởng xã hội đáng kể của sự phổ biến xe đạp là gì?
A. A. Nó đã dẫn đến việc phát minh ra bộ truyền động xích.
B. B. Nó khuyến khích việc sử dụng bánh xe có kích thước bằng nhau.
C. C. Nó đã ảnh hưởng đến những thay đổi trong trang phục của phụ nữ.
D. D. Nó đã gây ra sự suy giảm chất lượng đường sá.