Good morning, class. Today we're discussing the history of the bicycle. The first two-wheeled vehicle, called a 'draisine,' was invented in 1817 by a German baron. It had no pedals; riders pushed their feet against the ground. In the 1860s, pedals were added to the front wheel in France, creating the 'velocipede.' Later, the high-wheel bicycle became popular in the 1870s, but it was dangerous because riders sat very high. Finally, in 1885, the 'safety bicycle' was introduced with a chain drive and equal-sized wheels, making riding much safer and more practical.
❓ ¿Cuál fue el principal problema con la bicicleta de rueda alta mencionada por el conferenciante?
A. A. No tenía pedales.
B. B. Los jinetes se sentaban muy alto, lo que lo hacía peligroso.
C. C. Era demasiado caro de producir.
D. D. No podía utilizarse en caminos accidentados.