Good morning. Today we're going to discuss the history of the bicycle. The first two-wheeled vehicle, called the draisine, was invented in 1817 by a German baron. It had no pedals; riders pushed their feet along the ground. Later, in the 1860s, pedals were added to the front wheel, creating the velocipede. However, it was very uncomfortable due to its solid rubber tires. It wasn't until 1885 that the modern safety bicycle appeared, with a chain drive to the rear wheel and equal-sized wheels. This design became popular because it was safer and faster than earlier models.
❓ 강의에 따르면, 1885년 안전 자전거가 이전 디자인보다 가진 주요 장점은 무엇이었나요?
A. A. 견고한 고무 타이어가 장착되어 접지력이 더 좋았다.
B. B. 체인 구동 방식과 동일한 바퀴 크기 덕분에 더 안전했습니다.
C. C. 더 가벼운 재료 덕분에 신체적 노력이 덜 필요했다.
D. D. 거친 지형에서도 불편함 없이 사용할 수 있었다.
✅ 正确答案
B. It was safer because of its chain drive and equal wheel size.