Good morning, everyone. Today we're going to discuss the history of the bicycle. Now, many people believe the bicycle was invented in the 19th century, but its origins actually go back further. In 1817, a German inventor named Karl Drais created a wooden, two-wheeled machine called the 'draisine'. It had no pedals; riders pushed their feet against the ground to move. Later, in the 1860s, pedals were added to the front wheel in France, leading to the 'velocipede'. However, it was the invention of the chain drive in the 1880s that made cycling much more efficient and comfortable, as it allowed the rider to sit lower and pedal without spinning the front wheel. So, the key improvement that led to the modern bicycle was the chain drive.
❓ Según la conferencia, ¿cuál fue la principal ventaja de la transmisión por cadena introducida en la década de 1880?
A. A. Hizo las bicicletas más ligeras y más fáciles de transportar.
B. B. Les permitía a los ciclistas ir más rápido sin pedalear más.
C. C. Hizo el ciclismo más cómodo y eficiente al permitir una posición de asiento más baja.
D. D. Eliminó la necesidad de una rueda delantera.
✅ 正确答案
C. It made cycling more comfortable and efficient by allowing a lower seating position.