Two examples of security features on bank notes are ________.
A. complicated patterns and unique numbers
B. complicated patterns and different colors
C. complicated patterns and engraved numbers
D. different colors and unique numbers
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The first objects which were used as a kind of money are ________.
From about 1000BC, _______ was used to make ________ in China.
_________ was the first country to issue banknotes.
In _______, the United States chose the dollar as its currency.
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