C
　　Water problems in the future will become more serious .Our increasing population will greatly increase city wastes ,mainly polluted water .On the other hand ,increasing demands for water will reduce the amount of water available for diluting（冲淡）wastes .Rapidly developing industries will produce larger quantities of liquid wastes ,and many of these will contain chemicals which are noxious .To feed our rapidly increasing population , agriculture will have to develop greatly .This will produce ever increasing quantities of agricultural chemicals .From this , it is obvious that more steps must be taken immediately to develop measures for the pollution problem.
　　There are two ways in which this pollution problem can be reduced .The first relates to the treatment of wastes to reduce their pollution level. This is connected with the processing（加工）of treatment of the solid and liquid wastes ,to permit the reuse of the waste or reduce pollution upon final treatment .
　　The second way is to develop an economic use for all or a part of the wastes .Farm manure（肥料）is spread in fields .Liquid wastes from plants that treat polluted water are used in some areas for irrigation.
　　Liquid wastes from other processing plants may also be used as an extra source of water .Many industries ,such as meat and poultry（家禽）processing plants ,are currently changing former waste products into marketable byproducts .Other industries are exploring possible economic uses for their waste products.
　　9．The purpose of the passage is to_________ .
　　A．tell the readers about water pollution problems
　　B．warn the readers of the reducing water supply
　　C．explain various uses of water
　　D．discuss different measures to solve the pollution problem
　　10．The underlined word “noxious” probably means _________ .
　　A．dangerous
　　B．useless
　　C．harmful
　　D．disadvantageous
　　11．It can be concluded that_________ .
　　A．many companies of the world will work together on pollution problems
　　B．some industries are now making economic use of liquid wastes
　　C．byproducts from wastes may lead to a more successful marketplace
　　D．science is making great progress in increasing water supplies
　　12．The author writes the passage based on _________ .
　　A．interviews with officials in the field of water controls
　　B．explanations which make important expressions easier
　　C．instructions and personal observations
　　D．arguments and suggestions
　　参考答案:ACBD

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