阅读理解：阅读下面短文，并作每篇后的题目。从A,B,C,D,四个选项中选出最佳* In1620,about...
问题详情：阅读理解：阅读下面短文，并作每篇后的题目。从A,B,C,D,四个选项中选出最佳* In1620,abouthalftheUSAwascoveredbyforests.In1850,aboutathirdwascoveredbyforests.Todaytheforestshavealmostgone.Alotgoodlan...
问题详情：阅读理解：阅读下面短文，并作每篇后的题目。从A,B,C,D,四个选项中选出最佳* In1620,abouthalftheUSAwascoveredbyforests.In1850,aboutathirdwascoveredbyforests.Todaytheforestshavealmostgone.Alotgoodlan...