Today we're going to discuss the history of the bicycle. The first two-wheeled vehicle, called the 'velocipede', appeared in the early 19th century. It had no pedals, so riders pushed their feet along the ground. In the 1870s, the 'penny-farthing' became popular, with a huge front wheel and a small rear wheel. However, it was dangerous because riders sat high above the ground. Then in 1885, the 'safety bicycle' was invented. It had two equal-sized wheels and a chain drive, making it much safer and more practical. By the early 20th century, bicycles had become a common mode of transport for ordinary people.
❓ Vấn đề chính của xe đạp bánh to bánh nhỏ (penny-farthing) là gì?
A. A. Nó quá nặng để có thể đạp lên dốc.
B. B. Nó không có bàn đạp, khiến nó chạy chậm.
C. C. Người cưỡi ngồi cao trên mặt đất, nên rất nguy hiểm.
D. D. Nó quá đắt đối với hầu hết mọi người.
✅ 正确答案
C. Riders sat high above the ground, so it was dangerous.