Good morning, everyone. Today we're going to look at the history of the bicycle. Now, many people think the bicycle was invented in the 19th century, but in fact, a simple two-wheeled device was sketched by Leonardo da Vinci in the 15th century. However, the first practical bicycle, called the 'draisine', was built by a German baron in 1817. It had no pedals, so riders pushed their feet against the ground to move. Later, in the 1860s, pedals were added to the front wheel, and this design became popular in France. By the 1880s, the 'safety bicycle' with two equal-sized wheels and a chain drive was introduced, which is similar to what we ride today.
❓ Đặc điểm chính của chiếc xe đạp thực dụng đầu tiên mà giảng viên đề cập là gì?
A. Nó có bàn đạp gắn vào bánh trước.
B. Nó được vận hành bằng cách đẩy chân trên mặt đất.
C. Nó có hai bánh xe bằng nhau và bộ truyền động xích.
D. Bức tranh này được phác họa bởi Leonardo da Vinci.