题目选项分析

In many of the world's regions, increasing pressure on water resources has resultedfrom expanding development, changes in climate, and pollution, so that future supplies in some of the more arid areas are a concern

In many of the world's regions, increasing pressure on water resources has resultedboth from expanding development, changes in climate, and from pollution, so that the future supply in some of the more arid areas is a concern going forward