Today we're going to discuss the history of the bicycle. In the early 19th century, the first two-wheeled vehicle, called a 'draisine', was invented by Karl von Drais. It had no pedals; riders pushed their feet against the ground to move. Later, in the 1860s, pedals were added to the front wheel, creating the 'velocipede'. However, this design was uncomfortable due to its rigid frame. By the 1880s, the 'safety bicycle' with a chain drive and two equal-sized wheels became popular, making cycling safer and more accessible, especially for women.
❓ “安全自行车”相比早期设计的一个重大改进是什么？
A. 它的座椅更舒适。
B. 它采用了链条传动和等大的车轮，从而更加安全。
C. 它更轻便，更容易携带。
D. 这辆车可以不用手来骑。
✅ 正确答案
It used a chain drive and equal-sized wheels, making it safer.