单项选择题

Which of the following are true of the first metal coins

A．They were made of copper.
B．They were made of paper.
C．They were square but with a round hole in the center.
D．They were round but with a square hole in the center.

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单项选择题

Which of the following is the best title for this article

A．Countries and Their Money.
B．Kinds of Money.
C．Trade and Money.
D．The History of Money.

单项选择题

The main idea of the second paragraph is that ______.

A．different countries use different kinds of money today
B．different things were used as money
C．animals, shells, rice, elephant tusks, monkey tails and salted were used as money
D．cloth, knives, animals , shells, rice, elephant tusks, monkey tails and salted were used as money