单项选择题

Shells were used as money in history ______.

A．in file Philippines
B．in China
C．in Africa
D．in many places
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单项选择题
If you had to buy something expensive, even gold and silver were inconvenient because______.
A．they are easy to steal
B．they are difficult for people to obtain
C．they are not easy to carry around
D．they themselves are expensive, too
单项选择题
The ancient Chinese coins had a square hole in the center because ______.
A．it would be easier to put them together and carry them around
B．it would be lighter for people to carry them from place to place
C．people wanted to make it look nicer
D．people wanted to save the expensive metal they were made from
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