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.
❓ What was the main advantage of the Rover Safety Bicycle compared to earlier models?
A. A. It had a larger front wheel for speed.
B. B. It used a chain to drive the rear wheel, improving safety and efficiency.
C. C. It was lighter and easier to carry.
D. D. It included a motor for assistance.
✅ 正确答案
B. It used a chain to drive the rear wheel, improving safety and efficiency.