Good morning. Today we're going to discuss the history of the bicycle. The first bicycle, invented in the early 19th century, had no pedals; riders pushed their feet along the ground. By the 1860s, pedals were added to the front wheel, but this design was unstable. It wasn't until the 1880s that the 'safety bicycle' with two equal-sized wheels and a chain drive became popular, making cycling safer and more accessible to the general public. This design remains largely unchanged today.
❓ What made the safety bicycle a significant improvement over earlier designs?
A. It had a larger front wheel for speed.
B. It included pedals on the front wheel.
C. It used a chain drive and equal-sized wheels for stability.
D. It was the first bicycle to have no pedals.
✅ 正确答案
It used a chain drive and equal-sized wheels for stability.