高中三年级英语(人教版)全一册 Unit 1 Integrating Skills 2

　　For most collectors, the joy of collecting and learning about the items is the most important, but collections can become worth a lot of money. A collection becomes valuable if it is complete, that is, if it includes all the items in a series, or if it contains rare items. Stamps can also become valuable if there is something wrong with them. A Swedish stamp, issued in 1855, was printed on yellow paper instead of the green paper that should have been used. As a result, a stamp that had only cost a few pennies became worth millions of dollars. The only existing copy of the stamp was found by a young boy looking through his grandfather's collection. The stamp was sold to a collector in 1996 for $2.3 million!

　　Collecting coins is not quite as easy as collecting stamps, but beginners can start by going through the change in their pockets, that is, collect coins which are in circulation. Someone who wants to start a collection can also contact a club for coin collectors or ask a relative or a friend who collects coins. Experienced collectors usually have more than one coin of a certain kind and will not mind sharing the extra ones. They can also provide helpful advice about where to buy old or rare coins. Most collectors begin by collecting coins from their own country. A collection can be built around any theme, but coin collectors often arrange their collections based on where and when the coin was made.

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