成人英语三级
Water problem in the future will become more intense and more complex．Our increas-ing population will tremendously increase urban wasters, primarily sewage．On the other hand, increasing demands for water will decrease substantially the amount of water available for processing wasters．Rapidly expanding industries which involve more and more complex chemical processes will produce larger volume of liquid wasters,and many of these will con-tain chemicals which are noxious．To feed our rapidly expanding population, agriculture will have to be intensified．This will involve ever-increasing quantities of agricultural chemicals.
From this, it is apparent that serious steps must be taken immediately to develop corrective measures for the pollution problem.
There are two ways by which this pollution problem can be settled．The first relates to the treatment of wastes to decrease their pollution danger．This involves the processing of solid wasters prior to disposal and the treatment of liquid wasters to permit the reuse of the water or minimize pollution upon final disposal.
A second approach is to develop an economic use for all or a part of the wastes．Farm manure (肥料) is spread in fields as a nutrient or organic supplement．Wastes from sewage disposal plants are used in some areas both for irrigation and for the nutrients contained.
Wastes from other processing plants may also be used as a supplemental source of water.
Many industries, such as meat and poultry processing plants, are currently converting former waste products into marketable byproducts．Other industries are exploring potential econom-ic uses for their waste products.
The purpose of this passage is__________.
A．to acquaint the reader with water pollution problems
B．to alert the reader the dwindling water supply
C．to explain industrial uses of water
D．to demonstrate various uses of water
水的问题将会愈发严峻和复杂。不断增长的人口将会大大增加城市废品，主要是废水。从另一个方面来看，水的需求量增加也会大大降低处理废弃物所需要的水。迅速发展的工业与复杂的化学程序联系越来越紧密，就会产生大量的可能包含有害化学物质的废水。为了给不断扩大的人口提供饮食，农业也不得不加紧步伐，这就必然会造成农业化学物质的大量使用。因此，必须采取有效的措施来为水污染问题找到正确的解决方法。
有两种方法可以解决现在的污染问题。第一种就是对废品进行处理来降低对环境的危害，在清理固体垃圾之前先进行处理，或者对废水进行处理，使其能重复利用或者最大程度地减少其污染。
第二种方法是对所有或部分垃圾进行经济利用。农业肥料是用来给土地加强营养和补充有机物的。某些地方污水处理厂的废水既可以用来灌溉，也可以利用里面包含的营养物质。其他处理厂的废水也可以用来作为水资源的补充。像肉类和家禽类的加工厂，现在正在把以前的废弃物变成可以出售的副产品。还有一些工厂正在寻求垃圾产物的潜在经济利用方式。
【答案详解】
主旨概括题。这篇文章主要介绍污水的现状以及治理方法。A包含这层意思；B警告读者要缩减水的供应，原文没有这个意思；C解释水在工业上的应用，太片面；D演示水的不同用法。文中只是介绍污水的使用，故答案为A。
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