Good morning, class. Today we'll discuss the history of the bicycle. The first two-wheeled vehicle, called the draisine, was invented in 1817 by Karl von Drais. It had no pedals; riders pushed their feet against the ground. In the 1860s, pedals were added to the front wheel, creating the velocipede. However, its solid rubber tires made rides very bumpy. The major breakthrough came in 1885 when John Kemp Starley introduced the Rover Safety Bicycle, which featured a chain drive to the rear wheel and equal-sized wheels. This design made cycling much safer and more comfortable, leading to the bicycle's popularity boom in the 1890s.
❓ ローバー・セーフティ・バイシクルの主な利点は、それ以前のモデルと比べて何でしたか？
A. A. 速度を出すために前輪が大きかった。
B. B. 安全性のため、チェーンドライブと等しいサイズの車輪を採用していた。
C. C. ペダルを備えた最初のモデルでした。
D. D. それはゴム製のタイヤを備えており、乗り心地をより滑らかにした。
✅ 正确答案
B. It used a chain drive and equal-sized wheels for safety.