Good morning, everyone. Today we're going to discuss the history of the bicycle. The first bicycle, invented in the early 19th century, had no pedals and was pushed along by the rider's feet. Later, in the 1860s, pedals were added to the front wheel, but this design was unstable. It wasn't until the 1880s that the 'safety bicycle' with two equal-sized wheels and a chain drive became popular. This design made cycling much safer and more efficient, leading to a boom in bicycle use, especially among women, who gained greater freedom of movement.
❓ 讲座中提到的安全自行车的主要优势是什么？
A. 它的生产成本比早期型号更低。
B. 它让骑手们能够比以前更快地旅行。
C. 由于采用了链式传动和等径车轮，它更加安全且高效。
D. 它可以毫无困难地在崎岖不平的道路上行驶。
✅ 正确答案
It was safer and more efficient due to its chain drive and equal wheels.