Today we're going to discuss the history of the bicycle. While many people think of it as a modern invention, the first two-wheeled vehicle appeared in the early 19th century. However, it wasn't until the 1880s that the 'safety bicycle' with equal-sized wheels and a chain drive became popular. This design made riding much safer and more efficient, leading to a boom in cycling. Interestingly, the pneumatic tire, invented by John Boyd Dunlop in 1888, was originally developed to make his son's tricycle more comfortable, but it was soon adopted for bicycles, greatly improving ride quality.
❓ 19世纪80年代安全自行车普及的主要原因是什么？
A. A. 它的生产成本比早期型号更低。
B. B. 它拥有相同尺寸的车轮和链条传动装置，使其更加安全且高效。
C. C. 这是第一辆使用充气轮胎的自行车。
D. D. 它是专门为赛车比赛而设计的。
✅ 正确答案
B. It had equal-sized wheels and a chain drive, making it safer and more efficient.