Good morning, everyone. Today we're going to look at the history of the bicycle. Now, you might think the bicycle was invented in the 19th century, and you'd be right. But the first two-wheeled vehicle, called a 'velocipede', appeared in France in the 1860s. It had pedals on the front wheel, but no brakes. This made it quite dangerous. Later, in the 1870s, the 'penny-farthing' became popular in Britain, with a huge front wheel and a small rear wheel. However, it was unstable and difficult to mount. It wasn't until 1885 that the 'safety bicycle' with two equal-sized wheels and a chain drive was introduced, which is the design we still use today. So, the key improvement in the 1880s was the addition of the chain, making the ride much safer and more efficient.
❓ Según la conferencia, ¿cuál era la principal ventaja de la bicicleta de seguridad introducida en 1885?
A. A. Tenía una rueda delantera más grande para la velocidad.
B. B. Utilizaba una transmisión por cadena y ruedas de igual tamaño, lo que la hacía más segura.
C. C. Fue la primera bicicleta en tener pedales.
D. D. Era más ligera y más fácil de llevar.
✅ 正确答案
B. It used a chain drive and equal-sized wheels, making it safer.