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 the 'draisine', appeared in 1817. It had no pedals; riders pushed their feet against the ground. Later, in the 1860s, pedals were added to the front wheel, creating the 'boneshaker'. But it was only in 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.
❓ What made the safety bicycle more accessible to the general public?
A. A. It had no pedals and was easy to balance.
B. B. It featured a chain drive and two equal-sized wheels.
C. C. It was lighter and cheaper than earlier models.
D. D. It was powered by steam, so it required less effort.
✅ 正确答案
B. It featured a chain drive and two equal-sized wheels.