单项选择题

According to the passage, the Speech Machine's system was developed by ______.

A．the telephone office
B．a British company
C．the Defense Research Agency
D．the military service
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单项选择题
From this article readers can learn that ______.
A．by comparing and contrasting, today's money is convenient to carry
B．all of the money today is made of metal or paper
C．the earlier kinds of money seems to be art products
D．in parts of Africa monkey tails are still used as money
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.
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