Good morning, class. 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 propelled by the rider's feet pushing 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 uncomfortable due to its rigid frame. It wasn't until the 1880s that the 'safety bicycle' with a chain drive and two equal-sized wheels became popular, making cycling much safer and more accessible to the general public.
❓ ¿Qué hizo que la bicicleta de seguridad fuera más popular que los modelos anteriores?
A. A. Tenía un asiento más cómodo.
B. B. Contaba con una transmisión por cadena y ruedas de igual tamaño.
C. C. Era más ligera y más fácil de llevar.
D. D. Tenía pedales conectados a la rueda delantera.
✅ 正确答案
B. It featured a chain drive and equal-sized wheels.