We are now going to look at 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. Later, in the 1860s, pedals were added to the front wheel, but this design was unstable and difficult to ride. It wasn't until the 1880s that the 'safety bicycle' appeared, featuring two equal-sized wheels and a chain drive to the rear wheel. This design made cycling much safer and more comfortable, and it quickly became popular among both men and women. Today, the basic design of the safety bicycle remains largely unchanged.
❓ 1880년대에 도입된 '안전자전거'의 핵심 개선점은 무엇이었는가?
A. 더 큰 앞바퀴를 장착하여 더 빠른 속도를 낼 수 있었다.
B. 앞바퀴에 페달이 연결되어 있었다.
C. 그것은 크기가 같은 두 개의 바퀴와 뒷바퀴로 연결되는 체인 구동 장치를 갖추고 있었다.
D. 더 가벼웠고, 보관이 쉽도록 접을 수 있었다.
✅ 正确答案
It had two equal-sized wheels and a chain drive to the rear wheel.