Good morning, class. Today we're discussing the history of the bicycle. The first pedal-powered bicycle was invented in the 1860s by a French blacksmith named Pierre Michaux. However, it had wooden wheels and a heavy iron frame, making it difficult to ride. In 1885, John Kemp Starley introduced the 'safety bicycle' with a chain drive and equal-sized wheels, which was much more stable. This design became wildly popular and is the basis for modern bicycles. Interestingly, the original word 'bicycle' comes from French, combining 'bi-' meaning two and 'kyklos' meaning circle, referring to the two wheels.
❓ 강의에 따르면, 1885년에 소개된 안전 자전거의 주요 장점은 무엇이었습니까?
A. 나무 바퀴 덕분에 더 가벼웠다.
B. 체인 구동 방식과 동일한 크기의 바퀴를 사용하여 안정성을 높였습니다.
C. 프랑스의 대장장이에 의해 발명되었다.
D. 그것은 두 개의 바퀴를 가진 최초의 자전거였다.
✅ 正确答案
It had a chain drive and equal-sized wheels for better stability.