In today's lecture, we'll discuss the history of the bicycle. The first major innovation came in 1817, when Karl Drais invented a two-wheeled 'running machine' without pedals. Then, in the 1860s, pedals were added to the front wheel, creating the 'velocipede'. However, this design was uncomfortable and hard to ride. The breakthrough occurred in 1885 when John Kemp Starley introduced the 'safety bicycle' with a chain-driven rear wheel and equal-sized wheels. This design became the basis for modern bicycles. Interestingly, the safety bicycle's popularity also led to changes in women's fashion, as it made cycling accessible to women who wore skirts.
❓ ¿Cuál fue la principal ventaja de la bicicleta de seguridad introducida en 1885?
A. A. Tenía un asiento más cómodo.
B. B. Fue la primera bicicleta con pedales.
C. C. Utilizaba una rueda trasera impulsada por cadena y ruedas de igual tamaño, lo que la hacía más segura y estable.
D. D. Era más ligera y más barata de producir.
✅ 正确答案
C. It used a chain-driven rear wheel and equal-sized wheels, making it safer and more stable.