Good morning, class. 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 themselves along with their feet. Later, in the 1860s, pedals were added to the front wheel. This design was called the 'boneshaker' because it was very uncomfortable on rough roads. In the 1880s, the 'safety bicycle' was introduced, featuring two equal-sized wheels and a chain drive, which made riding much safer and more efficient. This design became the basis for modern bicycles.
❓ 1880年代の安全自転車の主な改良点は何でしたか？
A. A. それは前輪にペダルを追加した。
B. B. それは同じ大きさの二つの車輪とチェーン駆動を備えていた。
C. C. それはより軽く、持ち運びやすかった
D. D. アシスト用のモーターが付いていた。
✅ 正确答案
B. It had two equal-sized wheels and a chain drive