Good morning, everyone. Today we're going to discuss the history of the bicycle. Now, you might think the bicycle was invented in the 19th century, and you'd be right. However, the first two-wheeled vehicle, called a 'velocipede', appeared in France in the 1860s. It had pedals attached to the front wheel, but no brakes. Later, in the 1870s, British inventors added rubber tires and a chain drive, making the ride smoother. By the 1890s, the 'safety bicycle' with two equal-sized wheels became popular, especially among women, as it allowed for easier movement in long skirts. So, the key improvement in the 1870s was not just the rubber tires, but also the introduction of the chain, which increased speed and efficiency.
❓ Phát minh lớn nào trong xe đạp đã xuất hiện vào những năm 1870?
A. A. Việc bổ sung bàn đạp vào bánh trước.
B. B. Sự ra đời của lốp cao su và bộ truyền động xích.
C. C. Sự phát triển của hai bánh xe có kích thước bằng nhau.
D. D. Việc tạo ra một chiếc xe không có phanh.
✅ 正确答案
B. The introduction of rubber tires and a chain drive.