Good morning, everyone. Today we're going to discuss the history of the bicycle. Now, many people think the bicycle was invented in the 19th century, but its origins actually go back further. In 1817, a German inventor named Karl von Drais created a two-wheeled machine called the 'Draisine', which had no pedals. Riders pushed themselves along with their feet. It wasn't until the 1860s that pedals were added, in France. However, the real breakthrough came in 1885 when John Kemp Starley designed the 'Rover Safety Bicycle', which had a chain drive and equal-sized wheels. This design made cycling much safer and more practical, leading to a boom in popularity.
❓ 강의에 따르면, 로버 세이프티 자전거가 이전 디자인보다 가진 주요 장점은 무엇이었나요?
A. A. 앞바퀴에 페달이 연결되어 있었다.
B. B. 더 가볍고 휴대하기 쉬웠다.
C. C. 체인 구동 방식과 동일한 크기의 바퀴를 사용하여 더 안전했습니다.
D. D. 보관을 위해 접을 수 있었다.
✅ 正确答案
C. It used a chain drive and equal-sized wheels, making it safer.