Good morning, everyone. Today we're going to discuss the history of the bicycle. The first pedal-powered bicycle was invented in the 1860s by a French blacksmith named Pierre Michaux. However, it had wooden wheels and no brakes, making it dangerous. In the 1880s, John Kemp Starley introduced the 'safety bicycle,' which featured two equal-sized wheels and a chain drive. This design made cycling much safer and more popular. Interestingly, the pneumatic tire, invented by John Boyd Dunlop in 1888, was originally developed for his son's tricycle, but it was quickly adapted for bicycles, greatly improving comfort on rough roads.
❓ Theo bài giảng, lợi thế chính của 'xe đạp an toàn' được giới thiệu vào những năm 1880 là gì?
A. A. Nó có bánh xe bằng gỗ và không có phanh.
B. B. Đó là chiếc xe đạp đầu tiên chạy bằng bàn đạp.
C. C. Nó an toàn hơn nhờ có bánh xe đều nhau và bộ truyền động xích.
D. D. Nó được phát minh bởi Pierre Michaux.
✅ 正确答案
C. It was safer because of its equal-sized wheels and chain drive.