In today's lecture, we'll discuss the history of the bicycle. The first bicycle, invented in the early 19th century, had no pedals; riders pushed their feet along the ground. Later, the penny-farthing, with its large front wheel, became popular in the 1870s, but it was dangerous due to its height. The safety bicycle, introduced in 1885, featured equal-sized wheels and a chain drive, making it much more stable. This design quickly replaced the penny-farthing and is the basis for modern bicycles. Interestingly, the pneumatic tire, invented in 1888, was originally developed for bicycles, not cars, which greatly improved comfort and speed.
❓ ¿Cuál era la principal ventaja de la bicicleta de seguridad sobre el penny-farthing?
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 la primera bicicleta en tener pedales.
D. D. Era más barato de fabricar que los modelos anteriores.
✅ 正确答案
B. It had a chain drive and equal-sized wheels, making it more stable.