Today we're going to discuss the history of the bicycle. Although many people attribute its invention to the 19th century, the first two-wheeled vehicle appeared in 1817, invented by Karl Drais. It was called a 'running machine' because riders pushed their feet against the ground. Later, in the 1860s, pedals were added to the front wheel, leading to the penny-farthing. However, this design was unsafe due to its high center of gravity. The modern safety bicycle, with two equal-sized wheels and a chain drive, emerged in the 1880s and became widely popular, especially among women who gained new mobility.
❓ 페니파딩 자전거의 주요 문제점은 무엇이었나요?
A. A. 페달이 없었다.
B. B. 너무 느렸다.
C. C. 높은 무게 중심 때문에 위험했다.
D. D. 생산 비용이 너무 비쌌다.
✅ 正确答案
C. It was dangerous because of its high center of gravity.