Today we're going to discuss the history of the bicycle. Early bicycles in the 19th century had wooden wheels and no pedals; riders pushed their feet along the ground. The first major improvement came in the 1860s with the addition of pedals to the front wheel. However, these 'penny-farthings' were dangerous because of their large front wheel. In 1885, the 'safety bicycle' was introduced with two equal-sized wheels and a chain drive, making it much more stable. Later, pneumatic tires were added, which greatly improved comfort and speed. By the early 20th century, bicycles became affordable for the general public.
❓ Ưu điểm chính của xe đạp an toàn so với các mẫu xe trước đó là gì?
A. Nó có bánh xe bằng gỗ
B. Nó có bánh trước lớn hơn
C. Nó ổn định hơn nhờ bánh xe có kích thước bằng nhau và bộ truyền động xích.
D. Sản xuất rẻ hơn
✅ 正确答案
It was more stable due to equal-sized wheels and a chain drive