In today's lecture, we'll 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. Later, the penny-farthing, with its large front wheel, became popular in the 1870s, but it was dangerous due to its height. The safety bicycle, introduced in 1885, featured equal-sized wheels and a chain drive, making it much more stable. This design quickly replaced the penny-farthing and is the basis for modern bicycles. Interestingly, the pneumatic tire, invented in 1888, was originally developed for bicycles, not cars, which greatly improved comfort and speed.
❓ Lợi thế chính của xe đạp an toàn so với xe đạp bánh cao (penny-farthing) là gì?
A. A. Nó nhẹ hơn và dễ mang theo hơn.
B. B. Nó có bộ truyền động xích và các bánh xe có kích thước bằng nhau, giúp nó ổn định hơn.
C. C. Đây là chiếc xe đạp đầu tiên có bàn đạp.
D. D. Nó rẻ hơn để sản xuất so với các mẫu trước đó.
✅ 正确答案
B. It had a chain drive and equal-sized wheels, making it more stable.