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.
❓ Según la conferencia, ¿cuál fue el principal problema con la primera bicicleta de pedales?
A. A. No tenía frenos.
B. B. Los pedales estaban unidos a la rueda delantera, lo que causaba dificultades para dirigir.
C. C. Era demasiado pesado.
D. D. Tenía una transmisión por cadena que a menudo se rompía.
✅ 正确答案
B. The pedals were attached to the front wheel, causing steering difficulties.