Good morning, class. Today we're going to discuss the history of the bicycle. You might think it's a simple invention, but its development took over a century. The first two-wheeled vehicle, called the 'draisine', appeared in 1817. It had no pedals; riders pushed their feet against the ground. In the 1860s, pedals were added to the front wheel, creating the 'velocipede'. However, this design was uncomfortable and hard to control. The breakthrough came in 1885 when John Kemp Starley introduced the 'safety bicycle' with a chain drive and two equal-sized wheels. This design became the basis for modern bicycles. Interestingly, the pneumatic tire, invented in 1888 by John Boyd Dunlop, was initially intended for bicycles, not cars.
❓ Lợi thế chính của xe đạp an toàn ra mắt năm 1885 là gì?
A. A. Nó có bàn đạp gắn vào bánh trước.
B. B. Nó thoải mái hơn và dễ điều khiển hơn nhờ hệ thống truyền động xích và các bánh xe bằng nhau.
C. C. Đây là phương tiện đầu tiên sử dụng lốp hơi.
D. D. Nó cho phép người đi xe đẩy chân dọc theo mặt đất.
✅ 正确答案
B. It was more comfortable and easier to control due to its chain drive and equal wheels.