In today's lecture, we'll discuss the history of the bicycle. The first bicycle, invented in the early 19th century, had no pedals; riders pushed their feet against the ground. This was called a 'hobby horse.' Later, in the 1860s, pedals were added to the front wheel, creating the 'penny-farthing.' However, these were dangerous due to their large front wheel. It wasn't until the 1880s that the 'safety bicycle' appeared, with two equal-sized wheels and a chain drive, making it much safer and more practical for everyday use.
❓ Theo bài giảng, ưu điểm chính của xe đạp an toàn so với các mẫu xe trước đó là gì?
A. Nó có bánh trước lớn hơn để đạt tốc độ cao.
B. Nó an toàn hơn nhờ thiết kế và bộ truyền động xích.
C. Nó nhẹ hơn và dễ mang theo hơn.
D. Nó cần ít bảo trì hơn xe đạp bánh lớn bánh nhỏ.
✅ 正确答案
It was safer because of its design and chain drive.