Good morning, class. Today we're discussing the history of the bicycle. The first pedal-powered bicycle was invented in the 1860s by a French blacksmith named Pierre Michaux. However, it had wooden wheels and a heavy iron frame, making it difficult to ride. In 1885, John Kemp Starley introduced the 'safety bicycle' with a chain drive and equal-sized wheels, which was much more stable. This design became wildly popular and is the basis for modern bicycles. Interestingly, the original word 'bicycle' comes from French, combining 'bi-' meaning two and 'kyklos' meaning circle, referring to the two wheels.
❓ 根据讲座内容，1885年推出的安全自行车的主要优势是什么？
A. 由于木制车轮，它变得更轻了。
B. 它采用了链传动和等大的车轮，以提高稳定性。
C. 它是由一位法国铁匠发明的。
D. 这是第一辆有两个轮子的自行车。
✅ 正确答案
It had a chain drive and equal-sized wheels for better stability.