Good morning, everyone. Today we're going to discuss the history of the bicycle. Now, you might think the bicycle was invented in the 19th century, but its predecessor, the draisine, appeared in 1817. However, it wasn't until the 1880s that the safety bicycle, with two equal-sized wheels and a chain drive, became popular. This design made cycling much safer and more accessible to the general public. Interestingly, the pneumatic tire, invented in 1888 by John Boyd Dunlop, was initially developed for bicycles, not cars. This innovation greatly improved comfort and speed. By the early 20th century, bicycles had become a major mode of transport in many cities.
❓ Theo bài giảng, lý do chính khiến xe đạp an toàn trở nên phổ biến vào những năm 1880 là gì?
A. A. Nó rẻ hơn để sản xuất so với các mẫu trước đó.
B. B. Nó có bộ truyền động xích và các bánh xe có kích thước bằng nhau, giúp an toàn hơn.
C. C. Đây là chiếc xe đạp đầu tiên sử dụng lốp hơi.
D. D. Nó được phát minh bởi John Boyd Dunlop.
✅ 正确答案
B. It featured a chain drive and equal-sized wheels, making it safer.