四级What about supply? The three environmental trends—the shortage of fresh water, the loss of topsoil and the rising temperatures—are making it increasingly hard to expand the world's grain supply fast enough to keep up with demand.

供应呢？三大环境趋势——淡水短缺、表土流失和气温上升——使得世界粮食供应越来越难以快速增长，以满足需求。

2016年6月阅读原文

四级The three environmental trends—the shortage of fresh water, the loss of topsoil and the rising temperatures—are making it increasingly hard to expand the world's grain supply fast enough to keep up with demand.

三大环境趋势——淡水短缺、表土流失和气温上升——使得世界粮食供应越来越难以快速增长，以满足需求。

2016年6月四级真题（第一套）阅读 Section B

四级The three environmental trends——the shortage of fresh water, the loss of topsoil and the rising temperatures——are making it increasingly hard to expand the world’s grain supply fast enough to keep up with demand.

三种环境趋势——淡水短缺、表层土流失和气温上升——使世界粮食供应越来越难以以足够快的速度满足需求。

2016年6月大学英语四级真题（第2套)