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
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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Which of the following is the best title for the passage
A．The Melting of Icebergs
B．The Nature and Origin of Icebergs
C．The Size and Shape of Icebergs
D．The Dangers of Icebergs
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