Today we're going to discuss the history of the bicycle. The first two-wheeled vehicle, called the draisine, appeared in 1817 and was pushed along by the rider's feet. Later, in the 1860s, pedals were added to the front wheel, creating the velocipede. However, it wasn't until the 1880s that the chain drive was introduced, which allowed the rear wheel to be powered. This made riding much smoother and safer. Interestingly, the modern bicycle design, with two equal-sized wheels, became popular only after 1885, thanks to John Kemp Starley's safety bicycle. So, the key innovation that led to safer bicycles was the chain drive system.
❓ 강의에 따르면, 1880년대에 도입된 체인 드라이브의 주요 장점은 무엇이었습니까?
A. A. 그것은 자전거를 더 가볍게 만들었다.
B. B. 그것은 기수가 더 곧은 자세로 앉을 수 있게 해 주었다.
C. C. 그것은 뒷바퀴에 동력을 전달하여 승차를 더 안전하게 만들었다.
D. D. 페달의 필요성을 없앴다.
✅ 正确答案
C. It powered the rear wheel and made riding safer.