首页
登录
职称英语
NarratorListen to part of a talk in an environmental science class.Now get rea
NarratorListen to part of a talk in an environmental science class.Now get rea
游客
2025-02-06
33
管理
问题
Narrator
Listen to part of a talk in an environmental science class.
Now get ready to answer the questions. You may use your notes to help you answer. [br] According to the speaker, what might be an air pollutant in the future?
Narrator
Listen to part of a talk in an environmental science class. Professor
How much can you say about air pollutant? At first let’s have a look at a useful definition of it. A pollutant is a compound added directly or indirectly by humans to the atmosphere, and in such quantities to adversely affect humans, animals, vegetations or materials. On the other hand air pollution has a very flexible definition that allows continuous change. When the first air pollution law was established in England in the 14th century, air pollutants were limited to compounds that could be seen or smelled, which is very different from the list of harmful substances known today. As technology has developed and knowledge of health aspects has increased, the list of air pollutants has lengthened. In the future even water vapor might be thought of as an air pollutant under certain conditions
Many of the more important air pollutants, such as sulfur oxides, carbon monoxide, and nitrogen oxides are found in nature. Perhaps in your daily life you can’t feel them clearly since they don’t make up a big percentage of the air. Before we have learnt something about the properties of the above substances, let’s have a look at their historical development. As the earth developed, the concentrations of these pollutants were altered by various chemical reactions and become biogeochemical components, and then they serve as an air purification scheme by allowing the compounds to move from the air to the water or soil. On a global basis, nature’s output of these compounds dwarfs those resulting from human activities. However, human production usually occurs in a localized area, such as a city.
In these localized regions, human output may be dominant and may temporarily overload the natural purification scheme of cycles. The result is an increased concentration of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact the concentration tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0.08 parts per million, often shortened to ppm, which is about 400 times its natural level. Carbon monoxide, however, has a natural level of 0. 1 ppm and is not usually a pollutant until its level reaches about 15 ppm.
Now get ready to answer the questions. You may use your notes to help you answer.
24. What is the talk mainly about?
25. According to the speaker, what is the feature of air pollutants?
26. According to the speaker, what might be an air pollutant in the future?
27. What may be influenced by air pollutants?
Listen again to part of the lecture. Then answer the question.
Professor
The actual concentration need not be large for a substance to be a pollutant; in fact the concentration tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area.
28. What does the professor mean when he says this?
Professor
In fact the concentration tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area.
29. What can be inferred from this?
Professor
As the earth developed, the concentrations of these pollutants were altered by various chemical reactions and become biogeochemical components, then they serve as air purification scheme by allowing the compounds to move from the air to the water or soil.
选项
A、Sulfur oxides.
B、Carbon monoxide.
C、Nitrogen oxides.
D、Water vapor.
答案
D
解析
本题为细节题。题目问:说话者认为将来什么可能是空气污染物?文章的第一段指出“In the future even water vapor might be thought of as an air pollutant under certainconditions”,也就是说,水蒸气现在并不是大气污染物,将来可能成为污染物。其他几项均为干扰项,因为它们现在已经是污染物了,因此我们可以得出选项D为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3945105.html
相关试题推荐
NarratorListentopartofaconversationbetweenastudentandaprofessor.Now
NarratorListentopartofaconversationbetweenastudentandaprofessor.Now
NarratorListentopartofaconversationbetweenastudentandaprofessor.Now
NarratorListentopartofaconversationbetweenastudentandaprofessor.Now
NarratorListentopartofaconversationbetweenastudentandaprofessor.Now
NarratorListentopartofatalkinanenvironmentalscienceclass.Nowgetrea
NarratorListentopartofatalkinanenvironmentalscienceclass.Nowgetrea
NarratorListentopartofatalkinanenvironmentalscienceclass.Nowgetrea
NarratorListentopartofalectureaboutGPS.Nowgetreadytoanswertheques
NarratorListentoatalkonhomeautomationinamechanicalengineeringclass.
随机试题
ApartmentforRentModernstudioapartmentlocated10minutesfromshopsand
Asweknow,therearetwokindsofelephants:theAfricanandtheAsianeleph
Ihavealreadygiveninstructionsforthetasktobetakenupfirstandtheengi
ABO血型鉴定中产生错误最常见的原因是A.冷凝集素干扰 B.试验温度不当 C
社区营养教育中的单向交流的过程为:来源—信息—加工—渠道—解码—受者。( )
稀土被誉为“新材料之母”,广泛应用于光学、电子信息、航空航天、核工业等尖端科技领
与普通混凝土相比,高强混凝土的优点在于( ) A、延性较好 B、初期收缩
某房地产开发公司与某市郊区的某乡政府签订了协议,乡政府同意将100亩规划乡镇企业
全口义齿初戴时,如发现下颌义齿翘动,支点的位置通常是A.下颌隆突 B.磨牙后垫
按照《压力管道安全技术监察规程——工业管道》(TSGD0001-2009)的规
最新回复
(
0
)