Good morning, class. Today we're going to discuss the history of the bicycle. Now, many people think the bicycle was invented in the 19th century, but its origins actually go back further. The first two-wheeled vehicle, called a 'draisine', was invented by a German baron in 1817. It had no pedals; you pushed it with your feet. Later, in the 1860s, pedals were added to the front wheel in France. However, this design was dangerous because the front wheel was very large. It wasn't until the 1880s that the 'safety bicycle' with a chain drive and two equal-sized wheels was developed in England, which became the model for modern bikes.
❓ 1860년대 자전거 디자인의 주요 문제점은 무엇이었나요?
A. A. 페달이 없어서 느렸다.
B. B. 앞바퀴가 너무 커서 안전 문제를 초래했다.
C. C. 언덕을 오르기에는 너무 무거웠다.
D. D. 사용 중에 체인이 자주 끊어졌다.
✅ 正确答案
B. The front wheel was too large, causing safety issues.