Good morning, everyone. Today we're going to discuss the history of the bicycle. Now, you might think the bicycle was invented in the 19th century, and you'd be right. However, the first two-wheeled vehicle, called the 'draisine', appeared in 1817. It had no pedals; riders pushed their feet against the ground. Later, in the 1860s, pedals were added to the front wheel, creating the 'boneshaker'. But it was only in the 1880s that the 'safety bicycle' with a chain drive and two equal-sized wheels became popular, making cycling much safer and more accessible to the general public.
❓ 何が安全自転車を一般大衆にとってより利用しやすいものにしたのでしょうか？
A. A. ペダルがなく、バランスを取りやすかった。
B. B. それはチェーン駆動と二つの同じ大きさの車輪を備えていた。
C. C. それは以前のモデルよりも軽く、そして安価だった。
D. D. それは蒸気で動いていたため、より少ない労力で済んだ。
✅ 正确答案
B. It featured a chain drive and two equal-sized wheels.