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[单选题]包含有铜、锌、铁成分的是( )

A葡萄糖

B脂肪乳剂

C复方氨基酸

D维生素

E微量元素

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5. 2.Today anymore will accept money in exchange for goods and services. People use money to buy food, furniture, books bicycles and hundreds of others they need or want. When they work, they usually get paid in money.Most of the money today is made of metal or paper. But people used to use all kinds if things as money. One of the first kinds of money was shells. Shells were not the only things used as money. In China, cloth and knives were used. In the Philippine Islands, rice was used as money. In parts of Africa, Cattle were one of the earliest of money .Other animals were used as money too.The first metal coins were made in China. They were around and had a square hole in the center. People strung them together and carried them from place to place. Different countries have used different metals and designs for their money. The first coins in England were made of tin. Sweden and Russia used copper to make their money. Later, other countries began to make coins of gold and silver.But even gold and silver were inconvenient if you had to buy something expensive. Again the Chinese thought of a way to improve money. They began to use paper money. The first paper money looked more like a note from one person to another than paper money used today. Money has had an interesting history from the days of shell money until today.(10分)2.1 Which of the following can be cited as an example of the use of money in exchange for services?(2分)A. To sell a bicycle for $20.B. To get some money for old books at a garage sale.C. To buy things you need or want.D. To get paid for your work.

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