Today we're going to discuss the history of the bicycle. As you know, the modern bicycle has two wheels of equal size, but early versions were quite different. In 1817, a German inventor created a wooden frame with two wheels, but the rider pushed along the ground with their feet. This was called a 'hobby horse'. Then, in the 1860s, pedals were added to the front wheel, making the 'penny-farthing' popular, which had a very large front wheel and a small rear wheel. However, this design was dangerous because riders could easily fall forward. It wasn't until the 1880s that the 'safety bicycle' with a chain drive and two equal-sized wheels was introduced, which is the basis for modern bicycles.
❓ 강의에 따르면, 페니파딩 자전거의 주요 문제점은 무엇이었나요?
A. A. 언덕을 오르기에는 너무 무거웠다.
B. B. 라이더들은 큰 앞바퀰 때문에 쉽게 앞으로 넘어질 수 있었다.
C. C. 나무 프레임이 쉽게 부서졌다.
D. D. 페달이 없어서, 라이더들은 발로 밀어야 했다.
✅ 正确答案
B. Riders could easily fall forward due to the large front wheel.