Good morning, everyone. Today we're going to discuss the history of the bicycle. One key figure is Karl von Drais, who invented the 'running machine' in 1817. This early bicycle had no pedals; riders pushed their feet against the ground. Later, in the 1860s, pedals were added to the front wheel, creating the 'boneshaker'. However, it was not until the 1880s that the 'safety bicycle' with a chain drive and two equal-sized wheels became popular, making cycling much safer and more accessible to the general public.
❓ 1880년대에 소개된 '안전 자전거'의 주요 특징은 무엇이었나요?
A. A. 그것은 큰 앞바퀴가 있었고 페달이 없었다.
B. B. 그것은 체인 구동 장치와 두 개의 같은 크기의 바퀴를 사용했다.
C. C. 그것은 작은 모터로 작동되었다.
D. D. 라이더들이 발로 땅을 밀어야 했다.
✅ 正确答案
B. It used a chain drive and two equal-sized wheels.