Good morning, everyone. Today we're going to discuss the history of the bicycle. The first bicycle, invented in the early 19th century, had no pedals and was pushed along by the rider's feet. It was called a 'hobby horse.' Later, in the 1860s, pedals were added to the front wheel, creating the 'velocipede.' However, this design was very uncomfortable due to its solid rubber tires and rough ride. It wasn't until the 1880s that the 'safety bicycle' with two equal-sized wheels and a chain drive became popular, making cycling much safer and more accessible to the general public.
❓ 安全自行车相较于早期设计的主要改进是什么？
A. A. 前輪にペダルが取り付けられていた。
B. B. それは同じ大きさの二つの車輪とチェーン駆動を備えていた。
C. C. それはより軽く、生産コストも安かった
D. D. より滑らかな乗り心地のために、ソリッドラバータイヤを装備していた。
✅ 正确答案
B. It had two equal-sized wheels and a chain drive