Good morning. Today we're going to discuss the history of the bicycle. As you know, the modern bicycle has two wheels of equal size, but early versions were quite different. The first bicycle, invented in the early 19th century, had no pedals and was pushed along by the rider's feet. Later, the penny-farthing, popular in the 1870s, had a very large front wheel and a small rear wheel. It was difficult to mount and dangerous to ride. Then, in 1885, the safety bicycle was introduced with a chain drive and two equal-sized wheels, making it much more stable. This design quickly became popular.
❓ 1885年推出的安全自行车的主要优势是什么？
A. A. 它有一个更大的前轮以提高速度。
B. B. 由于车轮尺寸相同且采用链条传动，骑行更加轻松安全。
C. C. 这是第一辆没有脚踏板的自行车。
D. D. 它更轻便，制造成本也更低。
✅ 正确答案
B. It was easier and safer to ride due to equal-sized wheels and a chain drive.