Good morning, everyone. Today we're going to discuss the history of the bicycle. Now, many people believe the bicycle was invented in the 19th century, but its origins actually go back further. In 1817, a German inventor named Karl Drais created a wooden, two-wheeled machine called the 'draisine'. It had no pedals; riders pushed their feet against the ground to move. Later, in the 1860s, pedals were added to the front wheel in France, leading to the 'velocipede'. However, it was the invention of the chain drive in the 1880s that made cycling much more efficient and comfortable, as it allowed the rider to sit lower and pedal without spinning the front wheel. So, the key improvement that led to the modern bicycle was the chain drive.
❓ 講義によると、1880年代に導入されたチェーンドライブの主な利点は何でしたか？
A. A. それは自転車をより軽く、持ち運びやすくしました。
B. B. それにより、ライダーはより多くペダルをこがずに速く進むことができた。
C. C. より低い座位を可能にすることで、サイクリングをより快適かつ効率的にした。
D. D. それは前輪の必要性を排除した。
✅ 正确答案
C. It made cycling more comfortable and efficient by allowing a lower seating position.