Good morning, everyone. Today we're going to look at the history of the bicycle. As you know, the first bicycle-like vehicle appeared in the early 19th century, but it had no pedals. Riders pushed their feet along the ground. This was called a 'hobby horse'. Then, in the 1860s, pedals were added to the front wheel, creating the 'velocipede'. However, it was very uncomfortable because of the solid rubber tires. Later, in the 1880s, the 'safety bicycle' was developed with a chain drive and two equal-sized wheels, which made riding much more stable and popular.
❓ 「安全自転車」は、それ以前の設計と比べて、なぜより安定していたのでしょうか？
A. A. それは頑丈なゴムタイヤを備えていた。
B. B. それはチェーン駆動を備え、同じ大きさの二つの車輪を持っていた。
C. C. 前輪にペダルが付いていた。
D. D. それはより大きな前輪を備えていた。
✅ 正确答案
B. It had a chain drive and two equal-sized wheels.