Today we're going to discuss the history of the postal service. In the 19th century, mail was delivered by train, which was fast but limited to major routes. Then, in the early 20th century, the introduction of motor vehicles allowed for more flexible door-to-door delivery. However, it wasn't until the 1920s that airmail became practical, significantly reducing delivery time for long distances. Interestingly, the first regular airmail service in the United States began in 1918, but it was initially used only for government documents. By the 1930s, commercial airlines took over airmail, making it more efficient and cheaper for the public.
❓ 우편 배달에서 자동차의 주요 장점은 무엇이었나요?
A. A. 그들은 기차보다 빨랐다.
B. B. 그들은 더 유연한 문전 배송을 가능하게 했다.
C. C. 그들은 우편 요금을 인하했다.
D. D. 그들은 더 무거운 짐을 운반할 수 있었다.
✅ 正确答案
B. They allowed for more flexible door-to-door delivery.