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Municipal sewage is of relatively recent origin as a pollutant. It was first brought to public attention in the 19th century by a London physician who showed that the city's cholera outbreak had been caused by just one contaminated well. Even though the contamination of drinking water by disease germs has been nearly eliminated in this country, hundreds of communities are still discharging raw sewage into streams and rivers.?When we consider that this sewage contains effluents from toilets, hospitals, laundries,industrial plants, etc., then the potential of the pollutants as a health hazard is apparent.
The problem of municipal sewage disposal is complicated by the fact that, years ago, mostcities combined their storm and waste disposal sewers. Many of these combined systems work well, but others cannot cope with sudden heavy rains. When such storms occur, water mixed with sewage may flood and disable treatment plants unless bypassed, untreated, into a stream. In either case, the people may have little protection for several days from these wastes that may contain disease germs.?Even if adequately treated to eliminate the health hazard, sewage is aesthetically undesirable because of odors and colors produced. Detergents have posed a particular disposal problem. Although there is no indication that they are injurious to health, they can cause foaming, which can clog treatment plants and, at the least, spoil the scenic beauty of streams.?Rural and suburban residents should be aware that septic tanks and cesspools are a potential source of pollution to ground water supplies. This is especially true in the suburban areas with a high population density and with no municipal sewage disposal and treatment system available. In some areas, sewage disposal is accomplished by cesspools. Soil research is furnishing guidelines for more effective and safer use of systems such as these.
1. This passage is concerned primarily with the _____ .
A. problems of waste disposal
B. dangers of drinking from wells
C. turbidity of polluted water
D. outbreak of cholera
2. The author mentions the London cholera epidemic to _____ .
A. prove that the city refused to deal with pollution
B. prove that medical science once knew little about pollution
C. introduce the idea of contaminated water supplies
D. recall a historical fact?
3. In densely populated suburban areas, a danger exits from _____
A. streams that do not flow directly to open bodies of water
B. cesspools and septic tanks that contaminate water supplies
C. storm and waste disposal sewers that have been combined
D. the undesirable odors of sewage
4. In developing the main point, the author makes use of _____ .
A. scientific arguments
B. convincing testimony
C. common sense observations
D. analogy
答案解析
1.A。此題爲主旨題。線索詞爲"sewage"、"pollutant"、"sewage disposal"等，這些詞貫穿文章始終，可見A項符合題意。B、C、D三項皆爲文中細節，不能反映主題。
2.C。此題爲細節題。答案在第一段。線索詞爲"London cholera"。此題考查作者引用的目的。A項與文中所述事實相反。B項文中未涉及此話題。D項"London cholera"是一個"historical fact"，卻不是作者引用之目的。
3. B。此題爲細節題。答案在最後一段的主題句中。線索詞爲"suburban"、"source of pollution"和"ground water"。
4. C。此題爲篇章結構題。作者首先提出排污系統爲污染源，然後通過觀察、分析、歸納來闡述觀點，而沒用A項"科學論證"、B項"令人信服的證據"或D項"類比"。
