Good morning, everyone. Today we're going to discuss the history of the bicycle. Now, many people assume that the bicycle was invented in the 19th century, but actually the first two-wheeled vehicle, called the 'draisine', appeared in 1817. It was made of wood and had no pedals. Later, in the 1860s, pedals were added to the front wheel, creating the 'velocipede'. However, riding it was very uncomfortable because of the solid wheels and rough roads. Then, in 1885, the 'safety bicycle' was introduced. This design had a chain drive to the rear wheel and equal-sized wheels, which made riding much safer and more efficient. This is the design we still use today.
❓ An toàn xe đạp đã cải tiến chính nào so với các mẫu xe trước đó?
A. A. Nó có bánh xe bằng gỗ để di chuyển êm ái hơn.
B. B. Đây là mẫu đầu tiên có bàn đạp.
C. C. Nó sử dụng bộ truyền động xích và các bánh xe có kích thước bằng nhau để đảm bảo an toàn.
D. D. Nó nhẹ hơn và rẻ hơn để sản xuất.
✅ 正确答案
C. It used a chain drive and equal-sized wheels for safety.