In today's lecture, we'll discuss the history of the bicycle. The first bicycle, invented in the early 19th century, had no pedals and was pushed along by the rider's feet. Later, in the 1860s, pedals were added to the front wheel, making it faster but more dangerous. By the 1880s, the 'safety bicycle' with two equal-sized wheels and a chain drive became popular, as it was much safer and easier to ride. Interestingly, this design is essentially what we still use today. However, the introduction of pneumatic tyres in the 1890s greatly improved comfort and speed, which led to a cycling boom.
❓ '안전 자전거'가 이전 디자인보다 더 인기를 끌게 된 이유는 무엇인가요?
A. A. 앞바퀴에 페달이 달려 있었다.
B. B. 그것은 두 개의 같은 크기의 바퀴와 체인 드라이브를 갖추고 있었다.
C. C. 그것은 역사상 최초로 발명된 자전거였다.
D. D. 더 빨랐지만 더 위험했다.
✅ 正确答案
B. It had two equal-sized wheels and a chain drive.