【正文】
s hard to get one of these unmon stamps because they are especially beautiful or tell an interesting story or show all kinds of animals, then those are the ones that have value to you. ( ) 1. When you are going to post a letter, you must buy . A. a tenfen stamp B. a new stamp C. a collected stamp D. a valuable stamp ( ) 2. The post office says a stamp is useless if . A. it is collected B. you get a letter sent by post C. it is old D. it has a postmark on it ( ) 3. When some of the stamps are difficult to find, . A. nobody will try to get them B. they can bee of great value C. everybody would like to buy them D. they will be worthless[ ( ) 4. Which of the following is NOT true? A. The stamp has a picture and some words on it. B. Many used stamps are worth a lot of money. C. Stamp collectors try to get different kinds of stamps whether they are used or not. D. A used stamp can be used again to post a letter. ( ) 5. Which of the following is true? A. A new twenty— fen stamp is not worth t