Good morning. Today we're going to discuss the history of the bicycle. The first two-wheeled vehicle, called the Draisienne, was invented in 1817 by Karl von Drais. It had no pedals; riders pushed their feet against the ground. Then in the 1860s, pedals were added to the front wheel, creating the velocipede. However, it was extremely uncomfortable due to its rigid frame and iron wheels. The real breakthrough came in 1885 with John Kemp Starley's Rover Safety Bicycle, which featured a chain drive to the rear wheel and equal-sized wheels. This design made cycling much safer and more efficient, and it became the template for modern bicycles.
❓ 로버 세이프티 자전거가 이전 모델들보다 가진 주요 장점은 무엇이었나요?
A. A. 더 가볍고 휴대하기 쉬웠다
B. B. 체인 구동 방식으로 뒷바퀴에 동력을 전달했으며, 앞뒤 바퀴의 크기가 동일했다.
C. C. 앞바퀴에 페달을 부착한 최초의 자전거였다.
D. D. 더 나은 내구성을 위해 철제 바퀴를 사용했다
✅ 正确答案
B. It had a chain drive to the rear wheel and equal-sized wheels