Today we're going to discuss the history of the bicycle. Early bicycles, called velocipedes, appeared in the 19th century. They had wooden frames and iron wheels, making them very uncomfortable. In 1885, John Kemp Starley introduced the 'Rover' safety bicycle, which had a chain drive and equal-sized wheels. This design became popular because it was safer and faster than the penny-farthing. However, it wasn't until the 20th century that bicycles became widely affordable for ordinary people, especially after mass production techniques lowered costs. Now, bicycles are not just for transport but also for sport and leisure.
❓ Theo bài giảng, tại sao xe đạp an toàn 'Rover' lại trở nên phổ biến?
A. A. Nó rẻ hơn những chiếc xe đạp khác.
B. B. Nó có khung gỗ và bánh xe sắt.
C. C. Nó an toàn và nhanh hơn xe đạp bánh cao bánh thấp (penny-farthing).
D. D. Đây là chiếc xe đạp đầu tiên từng được phát minh.
✅ 正确答案
C. It was safer and faster than the penny-farthing.