7、Nobody can tell exactly why people first began to use salt,

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but it is well-known that salt has used in many different ways

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throughout history. People who lived over 3,000 years ago ate salted

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fish. In ancient Egypt, salt was used to preserve dying bodies.

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Stealing salt were regarded as a serious crime in different

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times. In the 18^th century, for example, a person was

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caught stealing salt, he was put into prison. In the

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Roman Empire, one of the most important road was built

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especially for salt to be carried from the mines to Rome.

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Guards were sent to protect the salt from stolen. The guards got their

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pay in salt, from which the English word “salary”originated. Any guard who fell asleep while on duty was said to be “not worth his salt”. This is still used today in English.