Good morning, class. Today we're going to discuss the history of the bicycle. The first two-wheeled vehicle, called a draisine, was invented in Germany in 1817. 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. However, these early bicycles were uncomfortable because of their solid rubber tires. It wasn't until 1888 that John Boyd Dunlop invented the pneumatic tire, which made riding much smoother. This innovation greatly increased the popularity of cycling.
❓ ¿Cuál era el principal problema de las bicicletas antes de 1888?
A. A. Eran demasiado pesados para montar.
B. B. Tenían neumáticos sólidos que hacían incómodos los viajes.
C. C. Solo estaban disponibles en Francia y Alemania.
D. D. No tenían pedales hasta 1888.
✅ 正确答案
B. They had solid tires that made rides uncomfortable.