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.
❓ 根据讲座内容，19世纪80年代引入的链传动的主要优势是什么？
A. A. 它使自行车更轻便，更容易携带。
B. B. 它让骑行者无需更用力踩踏就能骑得更快。
C. C. 它通过允许更低的座位位置，使骑行更加舒适和高效。
D. D. 它消除了对前轮的需求。
✅ 正确答案
C. It made cycling more comfortable and efficient by allowing a lower seating position.