【单选题】

Coin collection is one of the oldest known hobbies. In the past it was often enjoyed by kings and scholars. It is also a pleasant way of saving.

The designs (图案) on coins tell many stories. The coins of a country often are a record of its history and geography (地理) . Some old coins tell us all we know about a country or a period of history.Coins tell us about the art, dress and hairstyles (发型) of people who lived long ago.
To get the most enjoyment from your hobby of coin collecting, read as much as you can on the subject. Try to form a group of collector friends. If you have an old or foreign coin, find out where and when it was made, its name and value, and what you could have bought with it when it was in use.
Never clean a coin unless it is caked with dirt.Clean away the dirt with soap and warm water.Do not use anything harD、This will damage both the looks and value of the coin.
In order to keep the coins clean, you should put them in a box.A．Right.
B．Wrong.
C．Doesn’t say.