Today we're going to discuss the history of the postal service. In the early 19th century, letters were delivered by horseback riders, which was slow and unreliable. The first major improvement came in 1837 when the Penny Post was introduced in Britain, making it affordable for ordinary people to send mail. Later, in 1860, the Pony Express in the United States reduced delivery time across the continent to just 10 days. However, it was short-lived due to the invention of the telegraph. By the early 20th century, airmail began, but it wasn't until the 1970s that automated sorting machines revolutionized the speed of mail handling.
❓ Lý do chính khiến Pony Express ngừng hoạt động là gì?
A. A. Dịch vụ này quá đắt đối với hầu hết mọi người.
B. B. Việc phát minh ra điện báo đã khiến nó trở nên lỗi thời.
C. C. Thời gian giao hàng vẫn còn quá chậm.
D. D. Máy phân loại tự động đã thay thế nó.
✅ 正确答案
B. The invention of the telegraph made it obsolete.