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

　　As with stamps, you do not need a lot of special tools or equipment. You do need a safe place to store the coins. There are inexpensive albums that will protect your coins while still allowing you and your friends to enjoy them. You can hold the coins with your bare hands, but you should wear gloves if it is a valuable coin. Never touch the face or back of a coin. The dirt on your fingers will destroy the surface of the coin. Nor should you ever clean an old coin -- if you do, the coin will lose its value. You can clean ordinary coins if you wish: copper coins can be cleaned with vegetable oil and silver coins with common soap. After cleaning the coins, wipe them with a clean cloth. Never use any strong or dangerous chemicals.

　　Perhaps the most valuable coin in the world is the 1933 "Double Eagle". The coin was first issued in 1850 and was made of gold from California. The coin was changed in 1907 and was used until 1933, when the American government decided to take the country off the gold standard. People were no longer allowed to own the coin, and all the coins were brought back to the bank, where all but two were destroyed. The two coins that were left were kept in a museum. Some coins were stolen, but all of them were found by the police -- except for one! The last "Double Eagle" remained missing until 1996, when police officers managed to get the coin back in a secret operation. The government allowed the coin to be privately owned and it was sold to a collector for 7.5 million dollars.

_小精灵 儿童网