Good morning, everyone. Today we're going to discuss the history of the bicycle. Now, many people believe the bicycle was invented in the 19th century, but in fact, the first two-wheeled vehicle, called a draisine, appeared in 1817 in Germany. It had no pedals; riders pushed their feet against the ground. Later, in the 1860s, pedals were added to the front wheel in France. However, it wasn't until the 1880s that the chain drive and pneumatic tires were introduced, making bicycles much more comfortable and efficient. This design quickly became popular worldwide.
❓ Según la conferencia, ¿qué hizo que las bicicletas fueran significativamente más cómodas y eficientes?
A. La adición de pedales a la rueda delantera
B. La invención de la draisina en Alemania
C. La introducción de la transmisión por cadena y los neumáticos neumáticos
D. El uso de materiales más ligeros en el marco
✅ 正确答案
The introduction of the chain drive and pneumatic tires