精选优质文档-倾情为你奉上话题七：生态环保类(一)The need to feed a growing population is putting much pressure on the worlds supply of water. With 97% of the worlds water too salty to be drunk or used in agriculture, the worldwide supply of water needs careful management, especially in agriculture. Although the idea of a water shortage(短缺)seems strange to someone fortunate enough to live in a high rainfall country, many of the worlds agricultural industries experience constant water shortages.Although
