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.
❓ 19世纪70年代自行车的主要创新是什么?
A. A. 在前轮上加装脚踏板。
B. B. 橡胶轮胎和链条传动的引入。
C. C. 两个等尺寸轮子的发展。
D. D. 制造一辆没有刹车的车辆。
✅ 正确答案
B. The introduction of rubber tires and a chain drive.