Good morning, everyone. Today we're going to discuss the history of the bicycle. Now, many people think the bicycle was invented in the 19th century, but its origins actually go back further. The first known two-wheeled vehicle, called a 'velocipede', appeared in France in the 1790s. However, it had no pedals; riders pushed their feet against the ground. The real breakthrough came in 1860s when pedals were attached to the front wheel. But this design was dangerous because it was easy to tip over. It wasn't until the 1880s that the 'safety bicycle' with a chain drive and two equal-sized wheels became popular, making cycling much safer and more accessible to the public.
❓ Vấn đề chính của thiết kế xe đạp thô sơ (velocipede) vào những năm 1790 là gì?
A. Nó quá nặng để đi xe.
B. Nó không có bàn đạp, vì vậy người đi phải dùng chân đẩy.
C. Việc lái xe rất khó khăn.
D. Sản xuất nó quá đắt.
✅ 正确答案
It had no pedals, so riders had to push with their feet.