Good morning, everyone. Today we're going to discuss the history of the bicycle. Now, you might think the bicycle was invented in the 19th century, and you'd be right. However, the first two-wheeled vehicle, called the 'draisine', appeared in 1817. It had no pedals; riders pushed their feet against the ground. Later, in the 1860s, pedals were added to the front wheel, creating the 'boneshaker'. But it was only in 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.
❓ 안전 자전거가 일반 대중에게 더 쉽게 접근할 수 있게 된 이유는 무엇인가?
A. A. 페달이 없어서 균형 잡기가 쉬웠다.
B. B. 그것은 체인 구동 장치와 두 개의 동일한 크기의 바퀴를 갖추고 있었다.
C. C. 그것은 이전 모델들보다 더 가볍고 더 저렴했다.
D. D. 그것은 증기로 작동했기 때문에 더 적은 노력이 필요했다.
✅ 正确答案
B. It featured a chain drive and two equal-sized wheels.