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 along the ground. This was called a 'hobby horse.' Later, in the 1860s, pedals were added to the front wheel, creating the 'velocipede.' However, it was uncomfortable due to its rigid frame. Then, in the 1880s, the 'safety bicycle' was introduced with two equal-sized wheels and a chain drive, making it much safer and more efficient. This design became the foundation for modern bicycles.
❓ 安全自転車の主な改良点は、以前のモデルと比べて何でしたか？
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. それはより柔軟なフレームで作られていた。
D. D. 乗るのに体力を必要としなかった。
✅ 正确答案
B. It had two equal-sized wheels and a chain drive.