Today we're going to discuss the history of the bicycle. Early bicycles in the 19th century had wooden wheels and no pedals; riders pushed their feet along the ground. The first major improvement came in the 1860s with the addition of pedals to the front wheel. However, these 'penny-farthings' were dangerous because of their large front wheel. In 1885, the 'safety bicycle' was introduced with two equal-sized wheels and a chain drive, making it much more stable. Later, pneumatic tires were added, which greatly improved comfort and speed. By the early 20th century, bicycles became affordable for the general public.
❓ 안전 자전거가 이전 모델들보다 가진 주요 장점은 무엇이었나요?
A. 그것은 나무 바퀴가 달려 있었다.
B. 앞바퀴가 더 컸다.
C. 바퀴 크기가 동일하고 체인 구동 방식 덕분에 더 안정적이었다.
D. 생산 비용이 더 저렴했다
✅ 正确答案
It was more stable due to equal-sized wheels and a chain drive