Today's lecture is about the history of the bicycle. The first bicycle, invented in the early 19th century, had no pedals and was pushed along by the rider's feet. Later, in the 1860s, pedals were added to the front wheel, but this design was unstable because the wheel was very large. It wasn't until the 1880s that the 'safety bicycle' with two equal-sized wheels and a chain drive became popular. This design made cycling much safer and more accessible, especially for women, who began to use bicycles as a means of independent transport.
❓ 1880년대에 자전거를 더 안전하고 더 대중적으로 만든 것은 무엇이었나요?
A. A. 앞바퀴에 페달을 추가하는 것
B. B. 동일한 크기의 두 바퀴와 체인 드라이브의 도입
C. C. 매우 큰 앞바퀴의 사용
D. D. 체인 메커니즘의 제거
✅ 正确答案
B. The introduction of two equal-sized wheels and a chain drive