精选优质文档-倾情为你奉上(GIS学习网：）1. Looking beyond the 10-year period， the botanists estimate that some 3，000 native plant species may become extinct in the foreseeable futuremore than 10 percent of the approximately 25，000 species of plants in the United States. 在展望10年后的情况时植物学家们估计，在未来可预见到的时间内，3 000种本地植物占美国近25 000种植物的10%将可能灭绝。(GIS学习网：）2. The annual migrations of wildfowl and many other animals certainly cannot be regarded as a form of exploration， becaus
