Good morning, everyone. Today we're going to discuss the history of the bicycle. The first bicycle, invented in the early 19th century, had no pedals. Riders pushed their feet against the ground to move forward. Later, in the 1860s, pedals were added to the front wheel, but this made the bicycle difficult to ride because the front wheel was very large. It wasn't until the 1880s that the 'safety bicycle' was introduced, with two wheels of equal size and a chain drive to the rear wheel. This design, which is similar to modern bicycles, became extremely popular and led to a cycling boom in the 1890s.
❓ 講義によると、前輪にペダルが付いた自転車の大きな問題は何でしたか？
A. A. それらは製造するには高すぎた。
B. B. 大きな前輪のため、乗るのが難しかった。
C. C. それらは悪路では使用できなかった。
D. D. 彼らは都市に入ることを許されていなかった。
✅ 正确答案
B. They were difficult to ride due to the large front wheel.