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.
❓ 1888년 이전 자전거의 주요 문제점은 무엇이었나요?
A. A. 그들은 너무 무거워서 탈 수 없었다.
B. B. 그들은 승차감을 불편하게 만드는 단단한 타이어를 장착하고 있었다.
C. C. 그것들은 프랑스와 독일에서만 구할 수 있었다.
D. D. 그들은 1888년까지 페달이 없었다.
✅ 正确答案
B. They had solid tires that made rides uncomfortable.