Today we're going to discuss the history of the bicycle. Early bicycles in the 19th century had wooden wheels and no pedals; riders pushed their feet along the ground. The first major improvement came in the 1860s with the addition of pedals to the front wheel. However, these 'penny-farthings' were dangerous because of their large front wheel. In 1885, the 'safety bicycle' was introduced with two equal-sized wheels and a chain drive, making it much more stable. Later, pneumatic tires were added, which greatly improved comfort and speed. By the early 20th century, bicycles became affordable for the general public.
❓ 安全自行车相较于早期车型的主要优势是什么？
A. 它有木制的轮子。
B. 它有一个更大的前轮。
C. 由于车轮尺寸相同且采用链条传动，它更加稳定。
D. 生产成本更低。
✅ 正确答案
It was more stable due to equal-sized wheels and a chain drive