单项选择题
Where does a barter take place
A.Where there is only salt.
B.Where the people's trading needs are fairly simple.
C.Where metal tools are used.
D.Where money is unknown.
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单项选择题
What does the word stamped in Para. 3 mean
A.Pressed down
B.Trodden upon
C.Cut
D.Imprinted
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单项选择题
Which of the following statements is tree
A.Cowrie shells used to be valued because they are easy to carry
B.Salt is still used as money in Tibet
C.Metal is still in use after coins were put into practice
D.Coins and notes have taken the place of nearly all the forms-of money
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