Good morning, everyone. Today we're going to discuss the history of the bicycle. The first two-wheeled vehicle was invented in 1817 by a German baron, Karl von Drais. It was called the 'running machine' because riders pushed themselves along with their feet. However, it wasn't until the 1860s that pedals were added, and the modern bicycle began to take shape. Interestingly, the introduction of the safety bicycle in the 1880s, with equal-sized wheels and a chain drive, made cycling much safer and more popular, especially among women. This design essentially remains the standard today.
❓ 강의에 따르면, 1880년대에 어떤 주요한 변화가 일어났습니까?
A. 최초의 러닝 머신의 발명
B. 자전거에 페달을 추가하는 것
C. 동일한 크기의 바퀴를 가진 안전 자전거의 개발
D. 최초의 체인 드라이브 도입
✅ 正确答案
The development of the safety bicycle with equal-sized wheels