Good morning, everyone. Today we're going to discuss the history of the bicycle. The first bicycle, invented in the early 19th century, had no pedals and was pushed along by the rider's feet. Later, in the 1860s, pedals were added to the front wheel, but this design was unstable. It wasn't until the 1880s that the 'safety bicycle' with two equal-sized wheels and a chain drive became popular. This design made cycling much safer and more efficient, leading to a boom in bicycle use, especially among women, who gained greater freedom of movement.
❓ 講義で言及された安全自転車の主な利点は何でしたか？
A. 以前のモデルよりも生産コストが安かった。
B. これにより、乗り手は以前よりも速く移動できるようになった。
C. チェーン駆動と等しい車輪により、より安全で効率的でした。
D. 悪路でも問題なく使用できた。
✅ 正确答案
It was safer and more efficient due to its chain drive and equal wheels.