When these ancient people moved to the coast, they probably experienced a major cultural shift, the researchers suspect. That’s because observations of modern hunter－gatherer societies suggest that men are more likely to hunt for big animals when people live inland. On the coast, women play a more important role in providing food by gathering plants and shellfish.

　　As for the second clue, the researchers unearthed 57 pieces of reddish pigment(颜料). The researchers think that the cave habitants used the paint for coloring their bodies or for other ceremonies. Symbolic behavior is a clearly human feature.

　　Finally, the search discovered over 1,800 stone tools, including well－crafted blades(刀片). These blades came in various sizes. The smallest were just less than a half－inch wide. Ancient people may have attached these blades to the end of a stick to make spears or other tools.

　　28．What is the passage mainly about?

　　A．Ancient cave behavior.

　　B．New evidence of ancient life.

　　C．The history of human beings.

　　D．Human behavior’s development.

　　29．The early Africans moved to the South African coast with the main purpose of ________.

　　A．avoiding badly cold and dry weather

　　B．seeking the cultural development

　　C．seeking enough food to live on

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