Today we're going to discuss the history of the bicycle. In the early 19th century, the first two-wheeled vehicle, called a 'draisine', was invented by Karl von Drais. It had no pedals; riders pushed their feet against the ground to move. Later, in the 1860s, pedals were added to the front wheel, creating the 'velocipede'. However, this design was uncomfortable due to its rigid frame. By the 1880s, the 'safety bicycle' with a chain drive and equal-sized wheels became popular, making cycling safer and more accessible. This design is essentially what we still use today.
❓ 「安全自転車」の主な改良点は、以前の設計と比べて何でしたか？
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等しいサイズの車輪を使用し、より良い安定性を実現した。
C. C. それは木で作られていたため、より軽かった。
D. D. ライダーは地面に足を押し付ける必要があった。
✅ 正确答案
B. It used a chain drive and equal-sized wheels for better stability.