Good morning, everyone. Today we're going to discuss the history of the bicycle. Now, you might think the bicycle was invented in the 19th century, and you'd be right. However, the first two-wheeled vehicle, called a 'draisine', appeared in 1817. It had no pedals; riders pushed their feet against the ground to move. Then, in the 1860s, pedals were added to the front wheel. But this design was unstable because the front wheel was small. It wasn't until 1885 that the 'safety bicycle' was introduced, with a chain drive and two equal-sized wheels, which made riding much safer and more efficient.
❓ ¿Cuál era un problema importante con el diseño de la bicicleta en la década de 1860?
A. A) No tenía pedales en absoluto.
B. B) La rueda delantera era demasiado pequeña, lo que la hacía inestable.
C. C) La transmisión por cadena a menudo se rompía.
D. D) Las dos ruedas eran de diferentes tamaños, lo que causaba accidentes.
✅ 正确答案
B) The front wheel was too small, making it unstable.