Good morning, everyone. Today we're going to discuss the history of the bicycle. The first two-wheeled vehicle, called the draisine, was invented in 1817 by a German baron. It had no pedals; riders pushed themselves along with their feet. Then, in the 1860s, pedals were added to the front wheel, creating the velocipede. However, it was very uncomfortable because of its solid rubber tires and wooden frame. The real breakthrough came in 1885 when John Kemp Starley designed the Rover Safety Bicycle, which had a chain-driven rear wheel and equally sized wheels, making it much safer and faster. This design became the basis for modern bicycles.
❓ なぜローバー・セーフティ自転車が、それ以前のモデルに比べて大きな改良と見なされたのでしょうか？
A. A) それはより大きな前輪とペダルを備えていた。
B. B) それは等しいサイズの車輪を備えたチェーン駆動の後輪を使用していた。
C. C) 木製フレームを備えた最初の自転車でした。
D. D) 足で蹴って推進することができる。
✅ 正确答案
B) It used a chain-driven rear wheel with equal-sized wheels.