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 their feet against the ground. Later, in the 1860s, pedals were added to the front wheel, but this design was unstable. By the 1880s, the 'safety bicycle' with a chain drive and two equal-sized wheels became popular, making cycling safer and more accessible. Interestingly, the bicycle's popularity grew not only for leisure but also as a means of transport for workers, especially in European cities. Now, what was a key improvement of the safety bicycle?
❓ 講義で言及された安全自転車の重要な改良点は何でしたか？
A. A. 前輪にペダルが取り付けられていた。
B. B. それはチェーンドライブと二つの同じ大きさの車輪を使用していた。
C. C. それは以前のモデルよりも軽く、速かった。
D. D. それはペダルを一切必要としなかった。
✅ 正确答案
B. It used a chain drive and two equal-sized wheels.