Good morning. Today we're going to discuss the history of the bicycle. As you know, the modern bicycle has two wheels of equal size, but early versions were quite different. The first bicycle, invented in the early 19th century, had no pedals and was pushed along by the rider's feet. Later, the penny-farthing, popular in the 1870s, had a very large front wheel and a small rear wheel. It was difficult to mount and dangerous to ride. Then, in 1885, the safety bicycle was introduced with a chain drive and two equal-sized wheels, making it much more stable. This design quickly became popular.
❓ 1885년에 도입된 안전자전거의 주요 장점은 무엇이었나요?
A. A. 더 큰 앞바퀴를 가져 속도를 높였다.
B. B. 바퀴 크기가 동일하고 체인 구동 방식 덕분에 타기가 더 쉽고 안전했다.
C. C. 페달이 없는 최초의 자전거였다.
D. D. 더 가볍고 제조 비용이 더 저렴했다.
✅ 正确答案
B. It was easier and safer to ride due to equal-sized wheels and a chain drive.