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, invented by a German baron. It had no pedals; riders pushed their feet against the ground. Later, in the 1860s, pedals were added to the front wheel in France. But these early bicycles had wooden frames and iron wheels, making rides extremely bumpy. It wasn't until the 1880s that the 'safety bicycle' with a chain drive and two equal-sized wheels became popular, which is closer to what we ride today.
❓ ¿Cuál fue el principal inconveniente de los primeros vehículos de dos ruedas mencionados en la conferencia?
A. Eran demasiado pesados para montar.
B. No tenían pedales y requerían empujarse con los pies.
C. Tenían marcos de madera que se rompían fácilmente.
D. Solo eran utilizados por los barones alemanes.
✅ 正确答案
They had no pedals and required pushing with feet.