Good morning, everyone. Today we're going to discuss the history of the bicycle. Now, many people believe the bicycle was invented in the 19th century, but its origins actually go back further. In 1817, a German inventor named Karl Drais created a wooden, two-wheeled machine called the 'draisine'. It had no pedals; riders pushed their feet against the ground to move. Later, in the 1860s, pedals were added to the front wheel in France, leading to the 'velocipede'. However, it was the invention of the chain drive in the 1880s that made cycling much more efficient and comfortable, as it allowed the rider to sit lower and pedal without spinning the front wheel. So, the key improvement that led to the modern bicycle was the chain drive.
❓ 강의에 따르면, 1880년대에 도입된 체인 드라이브의 주요 장점은 무엇이었는가?
A. A. 그것은 자전거를 더 가볍고 휴대하기 쉽게 만들었다.
B. B. 라이더가 더 많이 페달을 밟지 않고도 더 빠르게 갈 수 있게 해 주었다.
C. C. 더 낮은 좌석 위치를 가능하게 함으로써 사이클링을 더 편안하고 효율적으로 만들었다.
D. D. 그것은 앞바퀴의 필요성을 없앴다.
✅ 正确答案
C. It made cycling more comfortable and efficient by allowing a lower seating position.