Today we're going to discuss the history of the bicycle. Invented in the early 19th century, the first bicycles had wooden frames and no pedals, requiring riders to push their feet along the ground. It wasn't until the 1860s that pedals were added to the front wheel. However, these 'penny-farthings' were dangerous due to their large front wheels. The modern safety bicycle, with two equal-sized wheels and a chain drive, emerged in the 1880s, making cycling much safer and more accessible to the general public.
❓ Vấn đề lớn của những chiếc xe đạp được phát minh vào những năm 1860 là gì?
A. Chúng có khung gỗ dễ gãy.
B. Chúng quá chậm để sử dụng thực tế.
C. Chúng nguy hiểm vì bánh trước quá lớn.
D. Chúng thiếu bàn đạp và rất khó điều khiển.
✅ 正确答案
They were dangerous because of their large front wheels.