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It can be inferred from the passage that________
A.natural materials are safe in food processing
B.chemicals are needed in food processing
C.food poisoning can be kept under control
D.food poisoning is out of control
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In ancient times wealth was measured and exchanged in things that could be touched:food,tools,and precious metals and stones.Then the barter system was replaced by coins,which Still had?real value since they were pieces of rare metal.Coins were followed by fiat money,paper notes that?have value only because everyone agrees to accept them.
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