Today's lecture is about the history of the bicycle. Now, many people assume that the bicycle was invented in the 19th century, but in fact, a primitive version appeared in the late 18th century in France. This early machine, called the 'celerifere', had no pedals and was pushed along by the feet. However, it was not until the 1860s that pedals were added to the front wheel, creating the 'velocipede'. Interestingly, the invention of the chain drive in the 1880s allowed the rear wheel to be powered, which made bicycles much safer and more efficient. This design, known as the 'safety bicycle', became the basis for modern bicycles.
❓ 강의에 따르면, 1880년대에 도입된 '세이프티 자전거'의 주요 장점은 무엇이었나요?
A. A. 페달이 없어서 타기가 더 쉬웠다.
B. B. 그것은 체인 드라이브를 사용하여 안전성과 효율성을 향상시켰다.
C. C. 앞바퀴가 달린 최초의 자전거였다.
D. D. 그것은 18세기 후반 프랑스에서 발명되었다.
✅ 正确答案
B. It used a chain drive, which improved safety and efficiency.