We are now going to look at the history of the bicycle. The first bicycle, invented in the early 19th century, had no pedals; riders pushed their feet against the ground to move forward. Later, in the 1860s, pedals were added to the front wheel, but this design was unstable and difficult to ride. It wasn't until the 1880s that the 'safety bicycle' appeared, featuring two equal-sized wheels and a chain drive to the rear wheel. This design made cycling much safer and more comfortable, and it quickly became popular among both men and women. Today, the basic design of the safety bicycle remains largely unchanged.
❓ 1880年代に導入された「安全自転車」の主な改良点は何でしたか？
A. 前輪が大きくなっていて、より速い速度を出すことができた。
B. 前轮にはペダルが取り付けられていた。
C. それは同じ大きさの二つの車輪と、後輪へのチェーン駆動を備えていた。
D. より軽量で、折りたたんで簡単に収納できました。
✅ 正确答案
It had two equal-sized wheels and a chain drive to the rear wheel.