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.
❓ Lợi thế chính của xe cơ giới trong việc giao thư là gì?
A. A. Chúng nhanh hơn tàu hỏa.
B. B. Chúng cho phép giao hàng tận nơi linh hoạt hơn.
C. C. Họ đã giảm chi phí bưu phí.
D. D. Chúng có thể chở được tải trọng nặng hơn.
✅ 正确答案
B. They allowed for more flexible door-to-door delivery.