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 in fact, early prototypes appeared as far back as the 15th century. However, the first practical two-wheeled vehicle, called the 'draisine', was created by a German baron in 1817. It had no pedals; riders pushed their feet along the ground. The major breakthrough came in 1860s in France, when pedals were added to the front wheel. But this design was unstable because of the large front wheel. It wasn't until the 1880s that the 'safety bicycle' with a chain drive and equal-sized wheels became popular, making cycling much safer and more accessible to the general public.
❓ What was the main problem with bicycles that had pedals on the front wheel?
A. A. They were too heavy to ride uphill.
B. B. They were unstable due to the large front wheel.
C. C. They were difficult to steer because of the chain drive.
D. D. They required riders to push their feet along the ground.
✅ 正确答案
B. They were unstable due to the large front wheel.