Good morning, everyone. Today we're going to discuss the history of the bicycle. The first bicycle, invented in the early 19th century, had no pedals and was pushed along by the rider's feet. Later, in the 1860s, pedals were added to the front wheel, but this design was unstable. It wasn't until the 1880s that the 'safety bicycle' with two equal-sized wheels and a chain drive became popular. This design made cycling much safer and more efficient, leading to a boom in bicycle use, especially among women, who gained greater freedom of movement.
❓ ¿Cuál fue la principal ventaja de la bicicleta de seguridad mencionada en la conferencia?
A. Era más barato de producir que los modelos anteriores.
B. Permitió a los pasajeros viajar más rápido que antes.
C. Era más seguro y eficiente gracias a su transmisión por cadena y sus ruedas iguales.
D. Podría utilizarse en caminos irregulares sin dificultad.
✅ 正确答案
It was safer and more efficient due to its chain drive and equal wheels.