People use money   86  food, books, bicycles and hundreds of other things they   87  .When they   88  ,they usually get paid in money.
Most of the money used today   89  metal or paper. But in ancient times people often used all kinds of things as money. One of the first kinds of money was shells（贝壳）.
In ancient China, cloth and knives   90  money. Elephant tusks（象牙）,monkey tails（尾巴）and salt were used in some parts of Africa. Rice was also a kind of money used by the ancient people on some islands. Cows and other animals were used as money. too.
The first copper（铜）coins   91  China. They were round and had a square（正方的）hole in the center. Different countries have used different metals for their money. Later some countries   92  to make coins of gold and silver（银）.But gold, silver and copper were heavy   93  when people needed a lot of coins to buy something expensive. The Chinese were the first   94  paper money. The first paper money didn’t   95  like the paper money we use today.