Good morning, everyone. 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 pushed along by the rider's feet. It was called a 'hobby horse.' Later, in the 1860s, pedals were added to the front wheel, creating the 'velocipede.' However, this design was very uncomfortable due to its solid rubber tires and rough ride. It wasn't until the 1880s that the 'safety bicycle' with two equal-sized wheels and a chain drive became popular, making cycling much safer and more accessible to the general public.
❓ 안전 자전거가 이전 디자인보다 주요하게 개선된 점은 무엇이었나요?
A. A. 앞바퀴에 페달이 연결되어 있었다.
B. B. 그것은 두 개의 동일한 크기의 바퀴와 체인 드라이브를 갖추고 있었다.
C. C. 더 가볍고 생산 비용이 더 저렴했다
D. D. 부드러운 승차감을 위해 고무 타이어가 장착되어 있었다.
✅ 正确答案
B. It had two equal-sized wheels and a chain drive