Good morning, everyone. Today we're going to discuss the history of the bicycle. The first two-wheeled vehicle, called the draisine, was invented in 1817 by a German baron. It had no pedals; riders pushed themselves along with their feet. Then, in the 1860s, pedals were added to the front wheel, creating the velocipede. However, it was very uncomfortable because of its solid rubber tires and wooden frame. The real breakthrough came in 1885 when John Kemp Starley designed the Rover Safety Bicycle, which had a chain-driven rear wheel and equally sized wheels, making it much safer and faster. This design became the basis for modern bicycles.
❓ 로버 세이프티 자전거가 이전 모델들보다 훨씬 개선된 것으로 여겨진 이유는 무엇인가요?
A. A) 그것은 더 큰 앞바퀴와 페달을 가지고 있었다.
B. B) 그것은 같은 크기의 바퀴를 가진 체인 구동 방식의 뒷바퀴를 사용했다.
C. C) 나무 프레임을 가진 최초의 자전거였다.
D. D) 발로 밀어서 추진할 수 있다.
✅ 正确答案
B) It used a chain-driven rear wheel with equal-sized wheels.