题目内容：
Why does the author mention ancient Egyptian adult heights in the last part of the passage ?
A．To realistically describe common people's physical conditions at that time． B．To reveal the oppressive working pressure faced with ordinary Egyptians．
C．To illustrate the fact that the quality of common life was truly low of the day．
D．To demonstrate the average Egyptian's unhealthy diet habits in ancient times．
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答案解析：