Water problems in the future will become nore intense and more complex. Our increasing population will tremendously increase urban wastes,primarily sewage. On the other hand, increasing demands for water will decease substantialy the amount of water available for diluting wastes. Rapidly expanding industries which involve more and more complex chemical processes will produce large volumes of liquid wastes, and many of these will contain chemicals which are noxious. To feed our rapidly expanding population, agriculture will have to be intensified. This will involve ever-increasingquantities of agricultural chemicals, From this , it is apparent that drastic steps must be taken immediately to develop corrective measures for the pollution problem.
There are two ways by which this pollution problem can be dwindled. The first relates to the treatment of wastes to decrease their pollution hazard. This involves the processing of solid wastes "prior to " disposal and the treatment of liquid wastes, or efflunets,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 is spread in fields as a nutrient or organic supplement . Effluents from sewage disposal plants are used in some areas both for irrigation and for the nutrients contained. Efflunets 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 potential eonomic uses for waste products.
1.The purpose of this passage is ______.
a.to alert the reader to the dwindling water supply
b.to explain industrial uses of water
c.to acquaint the reader with water pollution problems
d.to demostrate various measures to solve the pollution problem
2.Which of the following points is NOT INCLUDED in the passage?
a.In dustrial development incudes the simplification of complex chemical processes.
b.Diluting wastes needs certain amount of water
c.Demands for water will go up along with the expanding population
d.Intensive cultivation of land requires more and more chemicals
3.The reader can conclued that________.
a.countries of the world will work together on polution problems
b.byproducts from wastes lead to a more prosperous marketplace
c.science is making great progress on increasing water supplies
d.some industries are now ,aking economic use of wastes
4.The author gives substance to the passage through the use of _______.
a.interviews with authorities in the field of water controls
b.opinions and personal observations
c.definitions which clarify important terms
d.strong arguments and persuasions
5.The words "prior to "(para.2) probably mean______.
a.after
b.during
c.before
d.beyond
19/200答案:cadbc[NextPage]

Liberia, the oldest independent Negro state in West A frica, has been struggling for survial ever since its foundation in 1822.Progress has been hampered by constant hostility between the American Negroes whose families returned there in the early 19th century, and the West Africans whose ancestors never left the continent. Though the two groups are of the same race, they are divided by language and outlook and regard each other with deep suspicion creating a conflict which was not foreseen by Liberia's founders.
In addition, neighboring states, native tribel,disease, and poverty have made life dangerous and difficult. The government has tried desperately, through loans and a trickle of trade, to make ends meet.Anxiety about financial matters lessened somewhat when,in 1910, the United States accepted responsibility for Liberia's sruvival. However, not until Harvey Firestone, the American rubber king,decided that the United States must produce itsown rubber----with Liberia as the site of the rubber plantations----did liberia have much hope of paying its debts and balancing its budget.
The rubber industry,founded in the 1920's ,and the activity that followed it brought both progerss and profit to Liberia. Before that time Liberia had no roads, no mechanical transport and no good port; its people had little education and few tools. Liberians feel that the country is being ruled by rubber. For this reason, the recent discovery of iron ore is important. Liberian leaders are trying to moderate the power of the ruvver industry and to estaglish the country's political and economic independence.
1.Liberia has been in idffculty since its independence mainly because______.
a.the american negroes do not want to help the country.
b.there have been constant hostillity and suspicion between different tribes in the country.
c.there haven been constant hostility and suspicion between two groups of the same tride.
d.the goverment has adoped a wrong policy
2."The government has tried desperately, through loans and a trickle of trade, to make ends meet." to make ends meet" means_______.
a.the goverment has to borrow money from others
b. the goverment has to lend money to others
c.the goverment doesn't have to borrow or lend money
d.the goverment has either to borrow or to lend money
3.The country's finance began to improve a bit in________.
a.1822
b.1910
c.1920
d.1920's
4.The Liberians's attitude on to improve a bit in_______.
a.a total agreement
b.a total disagreement
c.a hostility
d.not a total agreement
5.The best title for this passage is_______.
a. American Negroes in West Africa
b.liberia----- a poor country
c.liberia and its development
d.liberia ----a country with rich rubber and iron
23/200答案：ccbdc