Good morning. Today we're going to discuss the history of the bicycle. While many people credit the 19th-century inventors for its creation, the first two-wheeled vehicle actually appeared in 1817, invented by a German baron named Karl von Drais. His machine, called the 'draisine', 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. Interestingly, the iconic high-wheeled 'penny-farthing' became popular in the 1870s, but it was dangerous because riders sat high above the ground. It wasn't until the 1880s that the safety bicycle, with two equal-sized wheels and a chain drive, made cycling accessible to the general public.
❓ 根据讲座内容，'前轮大后轮小'自行车的一个主要缺点是什么？
A. A. 对大多数人来说，它太贵了，买不起。
B. B. 它没有刹车，而且难以控制。
C. C. 骑手高高坐在离地面很远的位置，这使其变得危险。
D. D. 它要求骑手用脚沿地面推动。
✅ 正确答案
C. The rider sat high above the ground, making it dangerous.