Good morning, everyone. Today we'll discuss the history of the bicycle. The first two-wheeled vehicle, called the draisine, was invented in 1817 by Karl Drais. It had no pedals; riders pushed their feet against the ground. Later, in the 1860s, pedals were added to the front wheel, creating the velocipede. However, it was nicknamed the 'boneshaker' because of its rigid frame and rough ride. By the 1880s, the safety bicycle appeared with a chain drive and equal-sized wheels, making it much more stable and popular among both men and women. This design became the basis for modern bicycles.
❓ 안전 자전거가 이전 모델들에 비해 가진 주요 개선점은 무엇이었나요?
A. A. 앞바퀴에 페달이 달려 있었다.
B. B. 그것은 체인 구동 방식과 동일한 크기의 바퀴를 사용하여 더 안정적이었다.
C. C. 그것은 더 가볍고 생산 비용이 더 저렴했다.
D. D. 부드러운 승차감을 위해 고무 타이어가 장착되어 있었다.
✅ 正确答案
B. It used a chain drive and equal-sized wheels, making it more stable.