Today we're going to discuss the history of the postal service. In the 19th century, the introduction of the postage stamp revolutionized communication. Before that, the recipient usually paid for the delivery, which was often expensive. The first adhesive stamp, the Penny Black, was issued in Britain in 1840. Interestingly, it featured a portrait of Queen Victoria and was printed in black ink. However, it was not the first stamp used in the world; that honor goes to a local stamp in New York, but it wasn't adhesive. The Penny Black remained valid for only one year because the black ink made it easy to cancel with a red postmark, but it was also easy to reuse.
❓ Tại sao Penny Black chỉ có giá trị trong một năm?
A. A. Vì chân dung của Nữ hoàng không rõ ràng.
B. B. Vì mực đen giúp dễ dàng tái sử dụng.
C. C. Vì giá quá cao.
D. D. Bởi vì dấu bưu điện màu đỏ không nhìn thấy được.