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. It was called a 'hobby horse.' Later, in the 1860s, pedals were added to the front wheel, creating the 'velocipede.' However, this design was very uncomfortable due to the 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 accessible for the general public.
❓ Según la conferencia, ¿cuál era una característica clave de la bicicleta de seguridad?
A. A. No tenía pedales y se impulsaba con los pies.
B. B. Tenía una rueda delantera grande y una rueda trasera pequeña.
C. C. Tenía dos ruedas de igual tamaño y una transmisión por cadena.
D. D. Estaba hecho enteramente de madera y era muy ligero.
✅ 正确答案
C. It had two equal-sized wheels and a chain drive