Good morning, everyone. Today we're going to discuss the history of the bicycle. The first pedal-powered bicycle was invented in the 1860s by a French blacksmith named Pierre Michaux. However, it had wooden wheels and no brakes, making it dangerous. In the 1880s, John Kemp Starley introduced the 'safety bicycle,' which featured two equal-sized wheels and a chain drive. This design 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, but it was quickly adapted for bicycles, greatly improving comfort on rough roads.
❓ 강의에 따르면, 1880년대에 도입된 '세이프티 자전거'의 주요 장점은 무엇이었나요?
A. A. 그것은 나무 바퀴가 있었고 브레이크가 없었다.
B. B. 그것은 최초의 페달 구동 자전거였다.
C. C. 바퀴 크기가 동일하고 체인 구동 방식이었기 때문에 더 안전했습니다.
D. D. 그것은 피에르 미쇼에 의해 발명되었다.
✅ 正确答案
C. It was safer because of its equal-sized wheels and chain drive.