Good morning. Today we're going to discuss the history of the bicycle. The first two-wheeled vehicle, called the Draisienne, was invented in 1817 by Karl von Drais. It had no pedals; riders pushed their feet against the ground. Then in the 1860s, pedals were added to the front wheel, creating the velocipede. However, it was extremely uncomfortable due to its rigid frame and iron wheels. The real breakthrough came in 1885 with John Kemp Starley's Rover Safety Bicycle, which featured a chain drive to the rear wheel and equal-sized wheels. This design made cycling much safer and more efficient, and it became the template for modern bicycles.
❓ ¿Cuál era la principal ventaja de la Bicicleta de Seguridad Rover sobre los modelos anteriores?
A. A. Era más ligero y más fácil de llevar.
B. B. Tenía transmisión por cadena a la rueda trasera y ruedas del mismo tamaño.
C. C. Fue la primera en tener pedales unidos a la rueda delantera.
D. D. Usaba ruedas de hierro para mayor durabilidad.
✅ 正确答案
B. It had a chain drive to the rear wheel and equal-sized wheels