Good morning, everyone. Today we're going to discuss the history of the bicycle. The first pedal-powered bicycle was invented in the 1860s, but it had a major flaw: the pedals were attached directly to the front wheel, making it difficult to steer. In the 1870s, the 'penny-farthing' became popular, but its large front wheel made it unstable. It wasn't until the 1880s that the 'safety bicycle' with a chain drive and equal-sized wheels was introduced, which is similar to modern bicycles. This design greatly improved stability and safety, leading to a cycling boom in the 1890s.
❓ 講義によると、最初のペダル式自転車の主な問題は何でしたか？
A. A. それにはブレーキがなかった。
B. B. ペダルが前輪に取り付けられていたため、操縦が困難だった。
C. C. それは重すぎた。
D. D. それはしばしば壊れるチェーンドライブを備えていた。
✅ 正确答案
B. The pedals were attached to the front wheel, causing steering difficulties.