Today we're going to discuss the history of the bicycle. The first bicycle, invented in the early 19th century, had no pedals. Riders pushed their feet against the ground to move forward. By the 1860s, pedals were added to the front wheel, but this design was unstable. Then, in 1885, the 'safety bicycle' was introduced with a chain drive and two equal-sized wheels, making it much safer. Interestingly, this design also led to a rise in popularity among women, as it allowed them to wear more practical clothing while riding.
❓ 1885年推出的安全自行车的一个关键特征是什么？
A. A. 它没有踏板。
B. B. 它采用链条传动，并配有两个大小相同的轮子。
C. C. 它有一个非常大的前轮。
D. D. 它仅为男性设计。
✅ 正确答案
B. It had a chain drive and two equal-sized wheels.