A、When man began to preserve the dead. B、When man began to salt fish. C、Three thousand years ago. D、No one knows. D选项均为表示时间的名词词组

We do not know when men first began to use salt, but we do know that it has been used in many different ways throughout history. Historical evidence shows, for example, that people who lived over 3,000 years ago ate salted fish. Thousands of years ago in Egypt, salt was used to keep the dead from decaying.
    Stealing salt was considered a major crime during some period of history. In the 18th century, for example, if a person was caught stealing salt, he could be put in jail. History records that about ten thousand people were put in jail during that century for stealing salt! About 150 years before, in the year 1553, taking more than one’s share of salt was punishable as a crime. The offender’s ear was cut off.
    Salt was an important item on the table of a king. It was traditionally placed in front of the king when he sat down to eat. Important guests at the king’s table were seated near the salt. Less important guests were given seats farther away from it.
Questions 22 to 25 are based on the passage you have just heard.
22. How was salt used in Egypt thousands of years ago?
23. In the 16th century, what would happen to a man who took more than his share of salt?
24. Where was the salt placed when the king had his dinner?
25. When did man first begin to use salt?