In today's lecture, we'll discuss the history of the bicycle. The first two-wheeled vehicle, called the draisine, was invented 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, but it was nicknamed the boneshaker due to its uncomfortable ride. Later, in 1885, John Kemp Starley introduced the Rover Safety Bicycle, which featured a chain drive to the rear wheel and equal-sized wheels, making it much safer and more efficient. This design became the template for modern bicycles.
❓ ¿Cuál era la principal ventaja de la Rover Safety Bicycle en comparación con los modelos anteriores?
A. A. Tenía una rueda delantera más grande para la velocidad.
B. B. Usaba una cadena para impulsar la rueda trasera, mejorando la seguridad y la eficiencia.
C. C. Era más ligera y más fácil de llevar.
D. D. Incluía un motor de asistencia.
✅ 正确答案
B. It used a chain to drive the rear wheel, improving safety and efficiency.