首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
It was once thought that air pollution affected only the area immediately around large cities with factories and/or heavy automo
It was once thought that air pollution affected only the area immediately around large cities with factories and/or heavy automo
admin
2010-03-26
63
问题
It was once thought that air pollution affected only the area immediately around large cities with factories and/or heavy automobile traffic. Today, we know that although these are the areas with the worst air pollution, the problem is literally worldwide. On several occasions over the past decade, a heavy cloud of air pollution has covered the entire eastern half of the United States and led to health warnings even in rural areas away from any major concentration of manufacturing and automobile traffic. In fact, the very climate of the entire earth may be affected by air pollution. Some scientists feel that the increasing concentration of carbon dioxide (二氧化碳) in the air revolting from the burning of fossil fuels (coal and oil) is creating a "greenhouse effect"—holding in heat reflected from the earth and raising the world’s average temperature.
If this view is correct and the world’s temperature is raised only a few degrees, much of the polar ice cap will melt and cities such as New York, Boston, Miami, and New Orleans will be under water.
Another view, less widely held, is that increasing particular matter in the atmosphere is blocking sunlight and lowering the earth’s temperature—a result that would be equally disastrous. A drop of just a few degrees could create something close to a new ice age, and would make agriculture difficult or impossible in many of our top farming areas. At present we do not know for sure that either of these conditions will happen (though one recent government report prepared by experts in the field concluded that the greenhouse effect is very likely). Perhaps, if we are very lucky, the two tendencies will offset each other and the world’s temperature will stay about the same as it is now.
What does this passage mainly talk about?
选项
A、The greenhouse effect.
B、The burning of fossil fuels.
C、The potential effect of air pollution.
D、The likelihood of a new ice age.
答案
C
解析
主旨判断题。综合全文内容,进行归纳推理。本文阐述了科学家有关污染的两种观点,无论是“温室效应”,还是“新冰河时代”均是污染造成的潜在后果,故选C。
转载请注明原文地址:https://kaotiyun.com/show/Bck7777K
0
大学英语四级
相关试题推荐
A、Becauseofnuclearwaste.B、Becauseofthewar.C、Becauseofenvironmentpollution.D、Becauseofhunters’continuingwhaling.
Whathethoughtanddidatschool______(与这个问题毫无关系).
A、Findherwayaround.B、Enjoyherselfthoroughly.C、Remembertheculture.D、Seethedifference.D[听力原文]W:I’mgoingtoIndian
_____________(应当注意的是)thatpollutionhasbecomeoneofthethorniestproblemsinmanybigcities.
LudwigvanBeethovenwasoneofthegreatest【B1】whoeverlived.Hethoughtthatpeoplecouldbefreewhentheywrotemusic.Befo
A、Thesefactoriesproducedmachinesinthepast.B、Thesefactoriesproducedfarmtoolsinthepast.C、Thesefactoriesmanufac
Whatdopeopleusuallydowhentheirpetsarethoughttohavebehaviorproblems?Sinceit’smoredifficulttosolveseriousani
Whatdopeopleusuallydowhentheirpetsarethoughttohavebehaviorproblems?Whatistheeffectivemeasurewhenyoudon’tw
Whatdopeopleusuallydowhentheirpetsarethoughttohavebehaviorproblems?Whenapetdogeliminatesinthehousewhilei
随机试题
干扰素
下颌正中颏部双发性骨折或粉碎性骨折均可导致舌后坠引起呼吸困难,其原因是
施工成本管理就是要在保证工期和质量满足要求的情况下,采取相应管理措施,包括组织措施、经济措施、技术措施、合同措施把成本控制在计划范围内,并进一步寻求最大程度的成本节约。施工成本管理的任务和环节的正确程序是:
某食品加工厂为增值税一般纳税人,4月因管理不善丢失一批作为材料管理的以前月份从农民手中购入的免税农产品(已抵扣过进项税额),账面成本为9135元,尚未经有关部门批准处理。下列关于该食品加工厂会计处理的表述中,正确的是()。
少数人注射青霉素后出现胸闷、气急和呼吸困难等过敏(超敏)反应症状,严重者发生休克。以下有关叙述,正确的是()。
如图所示,一个边长为15厘米的正方形,内有一个直径为6厘米的圆,圆紧贴正方形内壁滚动一周,圆滚动时扫过的面积是多少平方厘米?(π取3.14)
不论是哪个民族、何种肤色的人,只要具有中华人民共和国国籍,就是中国公民。()
Whichwordcantaketheplaceoftheunderlinedword"fervency"inparagraph1?Theunusuallysurprisingwaythathescoredgoa
FoodandHealthVocabularyandExpressionsfoodborneillnessacuteadversereactionvermincontroltoxins
Whatmightdrivingonanautomatedhighwaybelike?Theanswerdependsonwhatkindofsystemisultimatelyadopted.Twodistinc
最新回复
(
0
)