Good morning, everyone. 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 against the ground to move forward. It was called the 'hobby horse.' Later, in the 1860s, pedals were added to the front wheel, creating the 'penny-farthing.' However, these were dangerous because riders sat high above the ground. The modern safety bicycle, with two equal-sized wheels and a chain drive, appeared in the 1880s and became popular due to its stability and ease of use.
❓ Theo bài giảng, vấn đề chính của xe đạp penny-farthing là gì?
A. A. Nó không có bàn đạp.
B. B. Nó quá nặng để đi.
C. C. Người cưỡi ngồi cao trên mặt đất, khiến việc này trở nên nguy hiểm.
D. D. Nó không ổn định vì các bánh xe có kích thước khác nhau.
✅ 正确答案
C. Riders sat high above the ground, making it dangerous.