Good morning. Today we're going to discuss the history of the bicycle. The first two-wheeled vehicle, called the draisine, was invented in 1817 by a German baron. It had no pedals; riders pushed their feet along the ground. Later, in the 1860s, pedals were added to the front wheel, creating the velocipede. However, it was very uncomfortable due to its solid rubber tires. It wasn't until 1885 that the modern safety bicycle appeared, with a chain drive to the rear wheel and equal-sized wheels. This design became popular because it was safer and faster than earlier models.
❓ 根据讲座内容，1885年安全自行车相较于早期设计的主要优势是什么？
A. A. 它配备了实心橡胶轮胎，以提供更好的抓地力。
B. B. 由于采用链条传动且前后轮尺寸相同，它更加安全。
C. C. 由于使用了更轻的材料，所需体力劳动较少。
D. D. 它可以在崎岖地形上使用而不会感到不适。
✅ 正确答案
B. It was safer because of its chain drive and equal wheel size.