Good morning. Today we're going to look at the history of the bicycle. Now, many people think the bicycle was invented in the 19th century, and that's partly true. The first two-wheeled vehicle, called the 'draisine', appeared in 1817, but it had no pedals. You pushed it along with your feet. Then, in the 1860s, pedals were added to the front wheel, creating the 'velocipede'. However, this was very uncomfortable because of the solid rubber tires. It wasn't until 1885 that the 'safety bicycle' was developed, with a chain drive and two equal-sized wheels, making it much safer and more practical for everyday use.
❓ Según la conferencia, ¿cuál fue una característica clave de la bicicleta de seguridad introducida en 1885?
A. A. No tenía pedales y se empujaba con los pies.
B. B. Tenía neumáticos de goma maciza para un viaje más suave.
C. C. Usaba una transmisión por cadena y dos ruedas de igual tamaño.
D. D. Fue el primer vehículo en tener una rueda delantera más grande que la trasera.
✅ 正确答案
C. It used a chain drive and two equal-sized wheels.