In today's lecture, 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, but it was nicknamed the boneshaker due to its uncomfortable ride. Later, in 1885, John Kemp Starley introduced the Rover Safety Bicycle, which featured a chain drive to the rear wheel and equal-sized wheels, making it much safer and more efficient. This design became the template for modern bicycles.
❓ ローバー・セーフティ・バイシクルの主な利点は、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、前輪が大きくなっていた。
B. B. それはチェーンを使用して後輪を駆動し、安全性と効率を向上させた。
C. C. それはより軽く、持ち運びやすかった。
D. D. それはアシスト用のモーターを含んでいた。
✅ 正确答案
B. It used a chain to drive the rear wheel, improving safety and efficiency.