Good morning, class. Today we're going to discuss the history of the bicycle. The first bicycle, invented in the early 19th century, had no pedals. Riders pushed themselves along with their feet. Later, in the 1860s, pedals were added to the front wheel. This design was called the 'boneshaker' because it was very uncomfortable on rough roads. In the 1880s, the 'safety bicycle' was introduced, featuring two equal-sized wheels and a chain drive, which made riding much safer and more efficient. This design became the basis for modern bicycles.
❓ 1880년대 안전 자전거의 주요 개선점은 무엇이었나요?
A. A. 앞바퀴에 페달을 추가했다
B. B. 그것은 크기가 같은 두 개의 바퀴와 체인 드라이브를 갖추고 있었다.
C. C. 더 가볍고 휴대하기 쉬웠다
D. D. 보조용 모터가 있었습니다.
✅ 正确答案
B. It had two equal-sized wheels and a chain drive