单选题 Why were people in the early 19th century unhappy when they received letters? [A] Because they had to buy stamps. [B] Because they had to pay postage. [C] Because the letters always brought them bad news.
【正确答案】 B
【答案解析】[分析] 从文中第二段第二句、第三句可知20世纪早期的人们收到信时不高兴，因为他们不得不付邮资。