1．The amount of usable water has always been of great interest in the world. (完形填空第一段)
(人们)一直对全世界可以使用的水的总量很感兴趣。
(1)The photos are of immense historical value.
这些照片极具历史价值。
(2)The question is of great importance.
这个问题非常重要。
2．As is known to us all，there is not enough water in all places for everyone to use as much as he likes. (完形填空第二段)
