Today we're going to discuss the history of the bicycle. Early bicycles in the 19th century had wooden wheels and no pedals; riders pushed their feet along the ground. The first major improvement came in the 1860s with the addition of pedals to the front wheel. However, these 'penny-farthings' were dangerous because of their large front wheel. In 1885, the 'safety bicycle' was introduced with two equal-sized wheels and a chain drive, making it much more stable. Later, pneumatic tires were added, which greatly improved comfort and speed. By the early 20th century, bicycles became affordable for the general public.
❓ ¿Cuál era la principal ventaja de la bicicleta de seguridad sobre los modelos anteriores?
A. Tenía ruedas de madera.
B. Tenía una rueda delantera más grande.
C. Era más estable gracias a ruedas de igual tamaño y una transmisión por cadena.
D. Era más barato producir.
✅ 正确答案
It was more stable due to equal-sized wheels and a chain drive