Passage 14

The world is not only hungry,it is also thirsty for water.This may seem strange to you,since nearly 75%of the earth's surface is covered with water.But about 97%of this huge __1__ is sea-water,or salt water.Man can only drink and use the other 3%-the fresh water that comes from rivers,lakes,underground,and other __2__.And we cannot even use all of that,because some of it is in the form of icebergs and glaciers.Even worse,some of it has been polluted.However,as things stand today,this small amount of fresh water,__3__ is constantly being replaced by rainfall,is still enough for us.But our need for water is increasing rapidly-almost day by day.We all have to learn how to stop wasting our __4__ water.One of the first steps we should take is to develop ways of reusing it.Experiments have already been done in this __5__,but only on a small scale.The systems that have been worked out those used in spacecraft.

世界不仅仅是饥饿的，它也是饥渴。这可能看起来很奇怪，因为75%的地球表面被水覆盖。但约97%的这一巨大的数量的水是海水或盐水。人只能喝，使用其他3%-淡水，这些淡水来自河流，湖泊，地下水，和其他资源。我们甚至不能使用所有淡水，因为它是以冰山和冰河的形式存在。更糟糕的是，一些已经被污染掉了。然而，今天的情况，这种少量的淡水，不断被降水量取代的，对我们来说还是足够的。但我们对水的需求,日益的增加。我们都要学习如何停止浪费我们的宝贵的水。我们应该采取的第一个措施是：发展再次利用水的方式。这个领域实验已经做了，但只有小规模。已经被研究的系统应用在航天器上。

1 A field B sources C.which D precious E amount

2 A field B sources C.which D precious E amount

3 A field B sources C.which D precious E amount

4 A field B sources C.which D precious E amount

5 A field B sources C.which D precious E amount

答案：EBCDA