Today we're going to 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. This was called a 'hobby horse.' Later, in the 1860s, pedals were added to the front wheel, creating the 'velocipede.' However, it was uncomfortable due to its rigid frame. Then, in the 1880s, the 'safety bicycle' was introduced with two equal-sized wheels and a chain drive, making it much safer and more efficient. This design became the foundation for modern bicycles.
❓ Sự cải tiến chính của xe đạp an toàn so với các mẫu xe trước đó là gì?
A. A. Nó có bàn đạp gắn vào bánh trước.
B. B. Nó có hai bánh xe bằng nhau và bộ truyền động xích.
C. C. Nó được làm bằng khung linh hoạt hơn.
D. D. Nó không đòi hỏi sức lực thể chất để cưỡi.
✅ 正确答案
B. It had two equal-sized wheels and a chain drive.