Today we're going to discuss the history of the bicycle. Although many people think the bicycle was invented in the 19th century, early prototypes appeared as far back as the 15th century. However, the first practical pedal-driven bicycle was developed in 1839 by a Scottish blacksmith named Kirkpatrick Macmillan. His design had pedals attached to the front wheel, which made it difficult to steer. Later, in 1885, John Kemp Starley introduced the 'safety bicycle' with a chain drive and two equal-sized wheels, which became the basis for modern bikes. So, the key improvement in Starley's design was the use of a chain to drive the rear wheel, making riding much safer and more efficient.
❓ 강의에 따르면, 존 켐프 스탈리의 1885년 자전거 설계의 주요 장점은 무엇이었나요?
A. A) 더 나은 제어를 위해 앞바퀴에 페달이 부착되어 있었다.
B. B) 체인 드라이브를 사용해 뒷바퀴에 동력을 전달하여 안전성과 효율성을 향상시켰다.
C. C) 그것은 15세기로 거슬러 올라가는, 최초로 발명된 자전거였다.
D. D) 그것은 이전의 모든 모델보다 더 가볍고 저렴했다.
✅ 正确答案
B) It used a chain drive to power the rear wheel, improving safety and efficiency.