In today's lecture, we'll discuss the history of the bicycle. The first bicycle, invented in the early 19th century, had no pedals; riders pushed their feet against the ground. This was called a 'hobby horse.' Later, in the 1860s, pedals were added to the front wheel, creating the 'penny-farthing.' However, these were dangerous due to their large front wheel. It wasn't until the 1880s that the 'safety bicycle' appeared, with two equal-sized wheels and a chain drive, making it much safer and more practical for everyday use.
❓ Según la conferencia, ¿cuál era la principal ventaja de la bicicleta de seguridad sobre los modelos anteriores?
A. Tenía una rueda delantera más grande para la velocidad.
B. Era más seguro debido a su diseño y transmisión por cadena.
C. Era más ligero y más fácil de llevar.
D. Requería menos mantenimiento que el penny-farthing.
✅ 正确答案
It was safer because of its design and chain drive.