In today's lecture, we'll discuss the history of the bicycle. The first two-wheeled vehicle, called the draisine, was invented in 1817 by Karl von Drais. It had no pedals; riders pushed their feet against the ground. In the 1860s, pedals were added to the front wheel, creating the velocipede, but it was nicknamed the boneshaker due to its uncomfortable ride. Later, in 1885, John Kemp Starley introduced the Rover Safety Bicycle, which featured a chain drive to the rear wheel and equal-sized wheels, making it much safer and more efficient. This design became the template for modern bicycles.
❓ 与前代车型相比，Rover安全自行车的主要优势是什么？
A. A. 它有一个更大的前轮，以便提高速度。
B. B. 它采用链条驱动后轮，提升了安全性与效率。
C. C. 它更轻便，更容易携带。
D. D. 它包含了一个辅助电机。
✅ 正确答案
B. It used a chain to drive the rear wheel, improving safety and efficiency.