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 powered by pushing your feet against the ground. It was called a 'hobby horse'. Later, in the 1860s, pedals were added to the front wheel, creating the 'velocipede'. However, this design was quite uncomfortable due to its rigid frame and wooden wheels. It wasn't until the 1880s that the 'safety bicycle' with two equal-sized wheels and a chain drive became popular, making cycling much safer and more efficient. This design is essentially the basis for modern bicycles.
❓ ¿Cuál fue una mejora importante de la 'bicicleta de seguridad' en comparación con los modelos anteriores?
A. Tenía un asiento más cómodo.
B. Usaba una transmisión por cadena y ruedas de igual tamaño.