Today we're going to discuss the history of the bicycle. Now, you might think the bicycle was invented in the 19th century, but its earliest form appeared in 1817, when a German inventor created a wooden frame with two wheels and a handlebar, but no pedals. Riders pushed their feet against the ground to move. This was called a 'hobby horse.' Later, in the 1860s, pedals were added to the front wheel, leading to the 'velocipede.' However, it wasn't until the 1880s that the chain-driven 'safety bicycle' with two equal-sized wheels became popular, making cycling much safer and more comfortable.
❓ Đặc điểm chính của hình dạng ban đầu nhất của xe đạp là gì?
A. A. Nó có cơ chế truyền động bằng xích.
B. B. Nó không có bàn đạp và người đi xe đẩy bằng chân.
C. C. Nó có hai bánh xe không đều nhau để đảm bảo an toàn.
D. D. Nó được làm hoàn toàn bằng kim loại.
✅ 正确答案
B. It had no pedals and riders pushed with their feet.