Good morning, everyone. Today we're going to discuss the history of the bicycle. The first pedal-powered bicycle was invented in the 1860s, but it had a major flaw: the pedals were attached directly to the front wheel, making it difficult to steer. In the 1870s, the 'penny-farthing' became popular, but its large front wheel made it unstable. It wasn't until the 1880s that the 'safety bicycle' with a chain drive and equal-sized wheels was introduced, which is similar to modern bicycles. This design greatly improved stability and safety, leading to a cycling boom in the 1890s.
❓ Theo bài giảng, vấn đề chính của chiếc xe đạp chạy bằng bàn đạp đầu tiên là gì?
A. A. Nó không có phanh.
B. B. Bàn đạp được gắn vào bánh trước, gây khó khăn trong việc lái.
C. C. Nó quá nặng.
D. D. Nó có bộ truyền động xích thường bị hỏng.
✅ 正确答案
B. The pedals were attached to the front wheel, causing steering difficulties.