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根据短文内容，选择正确答案。
Many children like collecting stamps. Stamps collecting didn't begin until 1854. As time goes on, there are more and more kinds of stamps. These stamps are very beautiful and interesting. There are many wonderful pictures on them. And there are more stamp collectors. Not only children but also men and women collect stamps. In 1921, America began selling all kinds of stamps to the collectors. In some countries, there are even lessons on stamp—collecting in school. People all over the world are becoming more and more interested in stamps. Each picture on a stamp has its meaning in it. It may be the head of a great leader, a famous scientist or a writer. It may be a beautiful bird or fish. It may be an interesting place. Every stamp tells us a story.
