In today's lecture, we'll discuss the history of the bicycle. The first bicycle, invented in the early 19th century, had no pedals; riders pushed their feet along the ground. Later, the penny-farthing, with its large front wheel, became popular in the 1870s, but it was dangerous due to its height. The safety bicycle, introduced in 1885, featured equal-sized wheels and a chain drive, making it much more stable. This design quickly replaced the penny-farthing and is the basis for modern bicycles. Interestingly, the pneumatic tire, invented in 1888, was originally developed for bicycles, not cars, which greatly improved comfort and speed.
❓ 안전자전거가 페니파딩 자전거에 비해 가진 주요 장점은 무엇이었나요?
A. A. 더 가볍고 휴대하기 쉬웠다.
B. B. 그것은 체인 구동 방식과 동일한 크기의 바퀴를 갖추어 더 안정적이었다.
C. C. 페달이 달린 최초의 자전거였다.
D. D. 이전 모델들보다 제조 비용이 더 저렴했다.
✅ 正确答案
B. It had a chain drive and equal-sized wheels, making it more stable.