Today we're going to discuss the history of the bicycle. The first bicycle, invented in the early 19th century, had no pedals; riders pushed their feet against the ground. By the 1860s, pedals were added to the front wheel, but this design was unstable. In 1885, the 'safety bicycle' appeared with a chain drive and two equal-sized wheels, making it much safer. Interestingly, the popularity of bicycles led to better road surfaces and even influenced the design of early automobiles. However, it wasn't until the 20th century that bicycles became affordable for the general public.
❓ 初期の自転車よりも安全自転車を安全にしたものは何でしょうか？
A. A. それはペダルがなく、足で蹴って進むものだった。
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. 安定性のために前輪が大きかった。
D. D. それはより軽い材料で作られていた。
✅ 正确答案
B. It had a chain drive and two equal-sized wheels.