Good morning, everyone. Today we're going to discuss the history of the bicycle. Now, many people assume that the bicycle was invented in the 19th century, and that's partly true. However, the first two-wheeled, pedal-less vehicle appeared in 1817, invented by a German baron. It was called a 'running machine' because riders pushed their feet along the ground. Later, in the 1860s, pedals were added to the front wheel in France, and this design became popular. But it wasn't until the 1880s that the chain drive and pneumatic tires were introduced, making bicycles much safer and more comfortable. So, the key point is that the modern bicycle evolved over several decades.
❓ According to the lecture, what was the main improvement of the bicycle in the 1880s?
A. The addition of pedals to the front wheel
B. The introduction of the chain drive and pneumatic tires
C. The invention of the running machine
D. The use of lighter materials for the frame
✅ 正确答案
The introduction of the chain drive and pneumatic tires