Good morning, class. Today we're going to discuss the history of the bicycle. The first bicycle, invented in the early 19th century, had no pedals and was propelled by the rider's feet pushing against the ground. It was called a 'hobby horse.' Later, in the 1860s, pedals were added to the front wheel, creating the 'velocipede.' However, this design was uncomfortable due to its rigid frame. It wasn't until the 1880s that the 'safety bicycle' with a chain drive and two equal-sized wheels became popular, making cycling much safer and more accessible to the general public.
❓ 안전 자전거가 이전 모델들보다 더 인기를 끌게 된 이유는 무엇인가요?
A. A. 더 편안한 좌석이 있었다.
B. B. 그것은 체인 드라이브와 동일한 크기의 바퀴를 특징으로 했다.
C. C. 그것은 더 가볍고 휴대하기 쉬웠다.
D. D. 앞바퀴에 페달이 연결되어 있었다.
✅ 正确答案
B. It featured a chain drive and equal-sized wheels.