Today we're going to discuss the history of the bicycle. Although many people credit Karl von Drais with inventing the first bicycle in 1817, it was actually a Frenchman named Pierre Michaux who added pedals to the front wheel in the 1860s. This design, called the velocipede, was difficult to ride because of its heavy wooden frame. Later, in the 1880s, John Kemp Starley introduced the 'safety bicycle' with a chain drive and two equal-sized wheels, which made cycling much safer and more popular. Interestingly, the pneumatic tire, invented by John Boyd Dunlop in 1888, was originally developed for his son's tricycle, not for bicycles.
❓ 강의에 따르면, 안전 자전거가 초기 디자인보다 가진 주요 장점은 무엇이었나요?
A. A. 그것은 더 가벼운 나무 프레임을 가지고 있었다.
B. B. 앞바퀴에 페달이 장착되어 있었다.
C. C. 체인 구동 방식과 동일한 크기의 바퀴를 사용하여 안정성을 확보했습니다.
D. D. 공기 타이어를 처음으로 포함한 것이었다.
✅ 正确答案
C. It used a chain drive and equal-sized wheels for stability.