Good morning, everyone. Today we're going to discuss the history of the bicycle. As you know, the bicycle has evolved significantly since its invention. The first two-wheeled vehicle, called the draisine, was invented in 1817 by Karl von Drais. It had no pedals; riders pushed their feet against the ground to move. Later, in the 1860s, pedals were added to the front wheel, creating the velocipede. However, these early models were uncomfortable because of their wooden frames and metal wheels. It wasn't until the 1880s that the safety bicycle, with two equal-sized wheels and a chain drive, became popular, making cycling safer and more accessible to the general public.
❓ Vấn đề lớn của xe đạp velocipede được phát minh vào những năm 1860 là gì?
A. Nó không có bàn đạp.
B. Quá nhanh.
C. Nó không thoải mái vì khung gỗ và bánh xe kim loại của nó.
D. Nó có hai bánh xe không đều nhau.
✅ 正确答案
It was uncomfortable due to its wooden frame and metal wheels.