Good morning, everyone. Today we're going to discuss the history of the bicycle. One key figure is Karl von Drais, who invented the 'running machine' in 1817. This early bicycle had no pedals; riders pushed their feet against the ground. Later, in the 1860s, pedals were added to the front wheel, creating the 'boneshaker'. However, it was not until 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.
❓ Какова была основная особенность «безопасного велосипеда», представленного в 1880-х годах?
A. A. У него было большое переднее колесо и не было педалей.
B. B. Он использовал цепной привод и два колеса одинакового размера.
C. C. Он работал от небольшого двигателя.
D. D. Оно требовало от riders отталкиваться ногами от земли.
✅ 正确答案
B. It used a chain drive and two equal-sized wheels.