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. Riders pushed themselves along with their feet. Later, in the 1860s, pedals were added to the front wheel. This design was called the 'boneshaker' because it was very uncomfortable on rough roads. In the 1880s, the 'safety bicycle' was introduced, featuring two equal-sized wheels and a chain drive, which made riding much safer and more efficient. This design became the basis for modern bicycles.
❓ ¿Cuál fue la principal mejora de la bicicleta de seguridad en la década de 1880?
A. A. Añadió pedales a la rueda delantera
B. B. Tenía dos ruedas del mismo tamaño y una transmisión por cadena.
C. C. Era más ligera y más fácil de llevar.
D. D. Tenía un motor de asistencia.
✅ 正确答案
B. It had two equal-sized wheels and a chain drive