Good morning, class. Today we're going to discuss the history of the bicycle. You might think it's a simple invention, but its development took over a century. The first two-wheeled vehicle, called the 'draisine', appeared in 1817. It had no pedals; riders pushed their feet against the ground. In the 1860s, pedals were added to the front wheel, creating the 'velocipede'. However, this design was uncomfortable and hard to control. The breakthrough came in 1885 when John Kemp Starley introduced the 'safety bicycle' with a chain drive and two equal-sized wheels. This design became the basis for modern bicycles. Interestingly, the pneumatic tire, invented in 1888 by John Boyd Dunlop, was initially intended for bicycles, not cars.
❓ 1885년에 소개된 안전 자전거의 주요 장점은 무엇이었나요?
A. A. 앞바퀴에 페달이 연결되어 있었다.
B. B. 체인 구동과 동일한 바퀴 덕분에 더 편안하고 제어하기 쉬웠다.
C. C. 공기 타이어를 처음으로 사용한 차량이었다.
D. D. 그것은 탑승자가 발을 땅에 대고 밀 수 있게 해주었다.
✅ 正确答案
B. It was more comfortable and easier to control due to its chain drive and equal wheels.