Good morning, class. Today we're discussing the history of the bicycle. The first bicycle, invented in 1817 by Karl von Drais, was called the 'draisine' and had no pedals. Riders pushed themselves along with their feet. Later, in the 1860s, pedals were added to the front wheel, creating the 'velocipede', also known as the 'boneshaker' due to its rough ride. Interestingly, the high-wheel bicycle, popular in the 1870s, allowed greater speed but was dangerous because riders sat high above the ground. Finally, the safety bicycle, introduced in 1885, featured a chain drive and two equal-sized wheels, making it much more stable and practical for everyday use.
❓ ¿Cuál era la principal ventaja de la bicicleta de seguridad sobre los modelos anteriores?
A. A. Era más ligero y más fácil de llevar.
B. B. Tenía transmisión por cadena y ruedas de igual tamaño, lo que la hacía más estable.
C. C. Fue el primer modelo en tener pedales.
D. D. Se podía montar sin usar las manos.
✅ 正确答案
B. It had a chain drive and equal-sized wheels, making it more stable.