单项选择题

What is the probable relationship between the two speakers

A．Salesman and customer.
B．Doctor and nurse.
C．Doctor and patient.
D．Patient and patient.
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单项选择题
A bride can ________if she finds her marriage gift useless.
A．ask for another gift
B．exchange it for something useful
C．return it to the giver
D．just keep it
问答题
MONEYMoney is accepted across the world as payment for goods or services. People use money to buy food, clothes, and hundreds of other things. In the past many different things were used as money. People on Pacific islands once exchanged shells for goods. The Chinese used cloth and knives. In Africa, elephant tusks or salt were used. Even today some people in Africa are still paid in salt. Coins were first invented by the Chinese. Originally they were round pieces of metal with a hole in the center, so that a piece of string could keep them together. This made doing business much easier, but people still found coins inconvenient to carry when they wanted to buy something expensive. To solve this problem the Chinese again came up with a solution. They began lo use paper money for coins. Now paper notes are used throughout the world.
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