Good morning, everyone. Today we're going to discuss the history of the bicycle. The first bicycle, invented in the early 19th century, had no pedals and was pushed along by the rider's feet. It was called a 'hobby horse'. Later, in the 1860s, pedals were added to the front wheel, creating the 'velocipede'. However, this design was uncomfortable and difficult to ride. It wasn't until the 1880s that the 'safety bicycle' with a chain drive and two equal-sized wheels became popular, making cycling much safer and more accessible to the general public.
❓ Đặc điểm chính nào của xe đạp an toàn đã làm cho nó trở nên phổ biến?
A. A. Nó có bàn đạp gắn vào bánh trước.
B. B. Nó có hai bánh xe bằng nhau và bộ truyền động xích.
C. C. Nó được đẩy về phía trước bằng chân của người lái.
D. D. Đó là chiếc xe đạp đầu tiên từng được phát minh.
✅ 正确答案
B. It had two equal-sized wheels and a chain drive.