题目选项分析

The period when the great painted caves at Lascaux and Altamira were occupied by Upper Paleolithic people has been established by carbon-14 dating, but what is much more difficult to determine is the reason for their decoration,the use to which primitive people put the caves, and the meaning of the magnificently depicted animals.

The period when the great painted caves at Lascaux and Altamira were occupied by Upper Paleolithic people has been established by carbon-14 dating, but what is much more difficult to determine are the reason for their decoration,the use to which primitive people put the caves, and the meaning of the magnificently depicted animals.