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.
❓ According to the lecture, what was the main problem with the first pedal-powered bicycle?
A. A. It had no brakes.
B. B. The pedals were attached to the front wheel, causing steering difficulties.
C. C. It was too heavy.
D. D. It had a chain drive that often broke.
✅ 正确答案
B. The pedals were attached to the front wheel, causing steering difficulties.