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 propelled by pushing feet against the ground. It was called a 'hobby horse.' Later, in the 1860s, pedals were added to the front wheel, creating the 'velocipede.' However, this design was uncomfortable because of its rigid frame and iron wheels. The breakthrough came in 1885 with the 'safety bicycle,' which featured a chain drive and equal-sized wheels, making it much safer and more practical for everyday use.
❓ 自行车的重大缺点是什么？
A. A. 它没有踏板。
B. B. 它很难操控。
C. C. 由于其坚硬的框架和铁轮，乘坐起来并不舒适。
D. D. 生产成本过高。
✅ 正确答案
C. It was uncomfortable due to its rigid frame and iron wheels.