C. The less it gets scratched, the less it values.
D. The longer it lasts, the more it values.
28. According to this passage, one of the rarest coins in the world is made of A. silver B. gold
C. copper D. paper
29. Coins become more valuable because_______.
A. they wear out your purses and pockets
B. the price of metal goes up
C. they fall more readily into a category for collectors due to their duration
D. both B and C
30. What really happened to some 19,564 large silver coins?
A. They were melted down. B. They were sunk in the Gulf of Mexico.
C. It is still a mystery. D. They were stolen by pirates.
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