Today we're going to discuss the history of the bicycle. Although many people think the bicycle was invented in the 19th century, its origins actually go back further. The first two-wheeled vehicle, called a 'draisine', was invented by a German baron in 1817. It had no pedals; riders pushed their feet against the ground. Later, in the 1860s, pedals were added to the front wheel, creating the 'velocipede'. However, this design was uncomfortable due to its rigid frame and wooden wheels. 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 practical for ordinary people.
❓ Vấn đề lớn với xe đạp velocipede, như đã đề cập trong bài giảng, là gì?
A. A. Nó quá nặng để có thể đạp lên dốc.
B. B. Nó không có phanh.
C. C. Nó không thoải mái vì khung cứng và bánh xe bằng gỗ.
D. D. Nó quá đắt đối với hầu hết mọi người.
✅ 正确答案
C. It was uncomfortable because of its rigid frame and wooden wheels.