Good morning, everyone. Today we're going to discuss the history of the bicycle. The first pedal-powered bicycle was invented in the 1860s by a French blacksmith named Pierre Michaux. However, it had wooden wheels and no brakes, making it dangerous. In the 1880s, John Kemp Starley introduced the 'safety bicycle,' which featured two equal-sized wheels and a chain drive. This design made cycling much safer and more popular. Interestingly, the pneumatic tire, invented by John Boyd Dunlop in 1888, was originally developed for his son's tricycle, but it was quickly adapted for bicycles, greatly improving comfort on rough roads.
❓ 講義によると、1880年代に登場した「安全自転車」の主な利点は何でしたか？
A. A. それは木製の車輪を備えており、ブレーキはなかった。
B. B. それは最初のペダル式自転車でした。
C. C. それは、同じ大きさの車輪とチェーン駆動のおかげで、より安全だった。
D. D. それはピエール・ミショーによって発明されました。
✅ 正确答案
C. It was safer because of its equal-sized wheels and chain drive.