Today we're going to discuss the history of the bicycle. In the early 19th century, the first two-wheeled vehicle, called a 'draisine', was invented by Karl von Drais. It had no pedals; riders pushed their feet against the ground to move. Later, in the 1860s, pedals were added to the front wheel, creating the 'velocipede'. However, this design was uncomfortable due to its rigid frame. By the 1880s, the 'safety bicycle' with a chain drive and equal-sized wheels became popular, making cycling safer and more accessible. This design is essentially what we still use today.
❓ '안전 자전거'가 이전 디자인에 비해 가진 주요 개선점은 무엇이었나요?
A. A. 앞바퀴에 페달이 연결되어 있었다.
B. B. 체인 구동 방식과 동일한 크기의 바퀴를 사용하여 더 나은 안정성을 확보했습니다.
C. C. 나무로 만들어져서 더 가벼웠다.
D. D. 라이더들이 발로 땅을 밀어야 했다.
✅ 正确答案
B. It used a chain drive and equal-sized wheels for better stability.