2017年12月英语四级阅读训练题214
2017年6月英语四六级考试已顺利结束，各位考生可以来看看文都英语老师给大家整理的2017年英语四六级真题解析！文都四六级小编提醒各位考生：英语四级考试中四级阅读所占比重为百分之三十五，阅读训练的重要性不言而喻，然而四级阅读技巧也是一门学问。来看看文都四六级小编为各位整理的2017年12月英语四级阅读训练题(214)，请各位考生及时练习。2017年6月大学英语四级考试真题及答案解析汇总
2017年6月大学英语六级考试真题及答案解析汇总
文都教育2017年6月英语四六级考试真题解析视频
A useful definition of an air pollutantis a compound added directly or indirectly by humans to the atmospherein suchquantities as to affect humans, animals, vegetation, or material adversely (有害地.. Air pollution requires avery flexibledefinition that permits continuous change. When the first air pollution lawswere established inEngland in the fourteenth century, air pollutants werelimited to compounds that could be seen or smelled—a farcry (悬殊的差别. from the extensive list of harmful substances known today. Astechnology has developed andknowledge of the health aspects of variouschemicals has increased, the list of air pollutants has lengthened. Inthefuture, even water vapor (水蒸气. might be consideredan air pollutant under certain conditions.
Many of the more important airpollutants, such as sulfur oxides, carbon monoxide, and nitrogen oxides,arefound in nature. As the Earth developed, the concentrations ( 浓度. of these pollutants were altered byvariouschemical reactions; they became components in biogeochemical (生物地球化学的. cycles. These serve as an airpurification scheme by allowing thecompounds to move from the air to the water or soil. On a global basis,nature'soutput of these compounds dwarfs that resulting from human activities. However,human productionusually occurs in a localized area, such as a city.
In this localized region, human outputmay be dominant and may temporarily overload the natural purificationscheme ofthe cycles. The result is an increased concentration of noxious ( 有害的. chemicals in the air. Theconcentrations atwhich the adverse effects appear will be greater than the concentrations thatthe pollutants wouldhave in the absence of human activities. The actualconcentration need not be large for a substance to be apollutant; in fact thenumerical value tells us little until we know how much of an increase thisrepresents over the concentration that would occur naturally in the area. Forexample, sulfur dioxide has detectable health effects at0.08 parts per million(ppm., which is about 400 times its natural level.Carbon monoxide, however, has a naturallevel of 0.1 ppm and is not usually apollutant until its level reaches about 15 ppm.
61、It can be inferred from thefirst paragraph that _________
A.water vapor is an air pollutant in localized areas
B.the definition of air pollution will continue to change
C.a substance becomes an air pollutant only in cities
D.most air pollutants today can be seen or smelled
62、In what way can naturalpollutants play an important role in controlling air pollution?
A.They function as part of a purification process.
B.They are dwarfed by the pollutants produced by human activities.
C.They are less harmful to living beings than are other pollutants.
D.They have existed since the Earth developed.
63、According to the passage,the numerical value Of the concentration level of a substance is only useful if
A.the other substances in the area are known
B.it is a localized area
C.it can be calculated quickly
D.the naturally occurring level is also known
64、Which of the following isbest supported by the passage?
A.To effectively control pollution, local government should regularlyrevise the air pollution laws.
B.One of the most important steps in preserving natural lands is tobetter enforce air pollution laws.
C.Scientists should be consulted in order to establish uniform limitsfor all air pollutants.
D.Human activities have great impact on air pollution.
65、The passage mainlydiscusses _________
A.the economic impact on air pollution
B.how much damage air pollutants can cause
C.what constitutes an air pollutant
D.the quantity of compounds added to the atmosphere
【答案解析】
61-65 BADDB
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