五、（2025·南京市建邺区一模）首字母填空。
新素材
社会百科 Can you imagine a world without money? Or a world without even the idea of money? Well，thousands of years ago，money was not used at all.
I 1，humans had
the “barter（物物交换）” system. This meant if people wanted something they weren't able to make or produce
t 2，they had to find someone who could produce it. Then they had to
g 3 that person something in exchange. It wasn't only goods that were bartered，but it was s
4 too：making wheels，repairing leather，or keeping cows.
Later，certain things came to be used as money because everyone would take these things in exchange. They were always
n 5. For example，cows，grains，salt and heads were all used as money at some time. It is difficult for us to imagine buying a horse，for example，with bags of salt but that is
e 6 what happened. Salt，in fact，was so
v 7 that some soldiers were paid in it. It is said that the word “salary” came from this practice. Finally，all these kinds of money were replaced（取代）by pieces of metal，especially gold and silver. Later on，people made coins，which had a consistent（一致的）purity and weight，and represented certain amounts of various objects. So a certain number of coins represented a cow，or 50 pounds of rice，and so on.
Today，of course，we have notes and coins issued（发行）by the government，and everyone
a 8 this as money. Money makes it possible to trade in our modern world. You might sometimes find a friend who you can do a direct trade with—perhaps one skateboard or game for another. But mostly this is impossible. Money also allows us to save. It would be difficult to save up lots of cows until you wanted to spend them.
W 9 would you put them while you saved? Money is also a measure（衡量）of value. If you have ever done jobs around the house to earn money to buy something like a bicycle，you will have learnt the value of what you were
s 10 for by how much work you had to do.
Money plays an important role in our lives. So get your money's worth.
