普通高中课程标准实验教科书 英语选修8 Unit 5 Reading

　　S2:Why, it's a primitive necklace. Did early people really care about their appearance like we do? It's lovely!

　　A:Yes, and so well preserved. What do you think it's made of?.

　　S4:Let me see. Oh, I think some of the beads are made of animal bones but others are made of shells.

　　A:How clever you are! One bone is actually an animal tooth and the shells are from the seaside. Can you identify any other bones?

　　S1:This one looks very much like a fish bone. Is that reasonable?

　　A:Yes, indeed, as the botanical analyses have shown us, all the fields around here used to be part of a large shallow lake. Probably there were fish in it.

　　S3:But a lake is not the sea. We are miles from the sea, so how did the seashells get here?

　　A:Perhaps there was trade between early peoples or they travelled to the seaside on their journeys. We know that they moved around, following the herds of animals. They didn't grow their own crops, but picked fruit when it ripened and hunted animals. That's why they are called hunters and gatherers. Now, why don't we go and visit the caves?