In today's lecture, we'll discuss the history of the bicycle. The first practical bicycle, called the 'draisine', was invented in Germany in 1817 by Karl von Drais. It had no pedals; riders pushed their feet against the ground. In the 1860s, pedals were added to the front wheel, creating the 'velocipede'. However, it was nicknamed the 'boneshaker' due to its uncomfortable ride on cobblestone streets. Later, in the 1880s, the 'safety bicycle' was introduced with two equal-sized wheels and a chain drive, making it much safer and more popular. This design is the basis for modern bicycles.
❓ ¿Cuál fue la razón principal por la que la 'bicicleta de seguridad' se volvió más popular que los modelos anteriores?
A. A. Era más ligera y rápida que las bicicletas anteriores.
B. B. Tenía un asiento más cómodo y neumáticos más suaves.
C. C. Era más seguro debido a sus ruedas de igual tamaño y transmisión por cadena.
D. D. Era más barato de fabricar que el velocípedo.
✅ 正确答案
C. It was safer because of its equal-sized wheels and chain drive.