Good morning, everyone. Today we'll discuss the history of the bicycle. The first two-wheeled vehicle, called the draisine, was invented in 1817 by Karl Drais. It had no pedals; riders pushed their feet against the ground. Later, in the 1860s, pedals were added to the front wheel, creating the velocipede. However, it was nicknamed the 'boneshaker' because of its rigid frame and rough ride. By the 1880s, the safety bicycle appeared with a chain drive and equal-sized wheels, making it much more stable and popular among both men and women. This design became the basis for modern bicycles.
❓ 安全自転車の主な改良点は、以前のモデルと比べて何でしたか？
A. A. 前輪にペダルが付いていた。
B. B. それはチェーンドライブと同サイズの車輪を採用しており、より安定性が高かった。
C. C. それはより軽く、生産コストも安かった。
D. D. より滑らかな乗り心地のためにゴム製のタイヤを備えていた。
✅ 正确答案
B. It used a chain drive and equal-sized wheels, making it more stable.