精选优质文档-倾情为你奉上托福阅读实战：历史类四Paragraph 6： Scholars offer three related but different opin:ons about the mysterious origin and jignificance of these paintings. One opinion is that the paintings were a record of seasonal bligrations made by herds. Because some paintings were made directly over others, obliterating i;tem, it is probable that a paintings value ended with the migration it pictured. Unfortunately, this explanation fails to explain the hidden locations, unless the migrations we
