Good morning, everyone. Today we're going to discuss the history of the bicycle. As you might know, the first bicycle-like invention appeared in the early 19th century, but it was called a 'hobby horse' and had no pedals. Riders pushed themselves along with their feet. Then, in the 1860s, pedals were added to the front wheel, creating the 'velocipede'. However, this design was uncomfortable and often called the 'boneshaker'. It wasn't until the 1880s that the 'safety bicycle' was introduced, with two equal-sized wheels and a chain drive. This design became hugely popular because it was much safer and faster than earlier models.
❓ 安全自行车相比早期车型的主要优势是什么？
A. A. 它的座椅更舒适。
B. B. 由于采用了链条传动和等径车轮，它更加安全且速度更快。
C. C. 它更轻便，更容易携带。
D. D. 它可以不用手就能骑乘。
✅ 正确答案
B. It was safer and faster due to its chain drive and equal wheels.