Good morning, everyone. Today we're going to discuss the history of the bicycle. Now, many people believe the bicycle was invented in the 19th century, but in fact, early prototypes appeared as far back as the 15th century. However, the first practical two-wheeled vehicle, called the 'draisine', was created by a German baron in 1817. It had no pedals; riders pushed their feet along the ground. The major breakthrough came in 1860s in France, when pedals were added to the front wheel. But this design was unstable because of the large front wheel. It wasn't until the 1880s that the 'safety bicycle' with a chain drive and equal-sized wheels became popular, making cycling much safer and more accessible to the general public.
❓ 앞바퀴에 페달이 달린 자전거의 주요 문제점은 무엇이었나요?
A. A. 그들은 언덕을 올라가기에는 너무 무거웠다.
B. B. 그들은 앞바퀴가 커서 불안정했다.
C. C. 체인 구동 방식 때문에 조종하기가 어려웠다.
D. D. 그들은 승객들이 발을 땅에 대고 밀어야 했다.
✅ 正确答案
B. They were unstable due to the large front wheel.