关于成人高考的英语完型填空一(3)

want. When they work， they usually get __2__ in money. Most of the money today is made of metal or paper. But people used to use all kinds of things as money. One of the first kinds of money was shells. Shells were not the __3__ things used. In China， cloth and knives were used， in the Philippine Islands， rice was used as money for a long time. Elephant tusks， monkey tails， and salt were used as money in parts of __4__.

　　Cattle was one of the earliest kinds of money. Other animals were used as money， too. The first metal coins were made in China. They were round and had a square hole at the center. People strung （串起）them together and carried them from place to place. Different countries have used __5__ metals and designs for their money. The first coins in England were made __6__ tin. Sweden and Russia used copper to make __7__ money. Later， countries began to make coins of gold and silver.

　　But even gold and silver were inconvenient （不方便）if you had to buy something expensive. Again