Good morning, class. Today we're going to discuss the history of the bicycle. The first two-wheeled vehicle, called a draisine, was invented in Germany in 1817. It had no pedals; riders pushed their feet against the ground to move. Later, in the 1860s, pedals were added to the front wheel in France. However, these early bicycles were uncomfortable because of their solid rubber tires. It wasn't until 1888 that John Boyd Dunlop invented the pneumatic tire, which made riding much smoother. This innovation greatly increased the popularity of cycling.
❓ 1888年以前、自転車の主な問題は何でしたか？
A. A. それらは重すぎて乗ることができなかった。
B. B. 彼らは乗り心地を悪くするソリッドタイヤを装着していた。
C. C. それらはフランスとドイツでのみ入手可能だった。
D. D. 彼らは1888年までペダルを持っていなかった。
✅ 正确答案
B. They had solid tires that made rides uncomfortable.