Good morning. 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 their feet along the ground. Later, in the 1860s, pedals were added to the front wheel, creating the velocipede. However, it was very uncomfortable due to its solid rubber tires. It wasn't until 1885 that the modern safety bicycle appeared, with a chain drive to the rear wheel and equal-sized wheels. This design became popular because it was safer and faster than earlier models.
❓ 講義によると、1885年の安全自転車がそれ以前の設計に対して持っていた主な利点は何でしたか？
A. A. より良いグリップのために、ソリッドラバータイヤを装備していた。
B. B. チェーン駆動と同一サイズの車輪により、より安全だった。
C. C. 軽量な素材により、身体的な労力が少なくて済んだ。
D. D. 起伏の多い地形でも不快感なく使用できる可能性がある。
✅ 正确答案
B. It was safer because of its chain drive and equal wheel size.