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.
❓ Vấn đề chính của xe đạp trước năm 1888 là gì?
A. A. Chúng quá nặng để cưỡi.
B. B. Họ có lốp xe đặc khiến việc di chuyển trở nên khó chịu.
C. C. Chúng chỉ có sẵn ở Pháp và Đức.
D. D. Chúng không có bàn đạp cho đến năm 1888.
✅ 正确答案
B. They had solid tires that made rides uncomfortable.