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 heavy automobil
It was once thought that air pollution affected only the area immediately around large cities with factories and heavy automobil
admin
2015-06-23
35
问题
It was once thought that air pollution affected only the area immediately around large cities with factories and 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 in the air resulting 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 particulate 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 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.
The passage is mainly about______.
选项
A、the potential effect of air pollution
B、the possibility of a new ice age
C、the effects of global warming
D、the causes of climate change
答案
A
解析
主旨题。综观全文,丈章主要讲述了空气污染可能造成的严重后果。选项B、C均只概括了文章的部分内容,D项文章未提到。故答案为A。
转载请注明原文地址:https://kaotiyun.com/show/f3l7777K
0
大学英语四级
相关试题推荐
A、Shewaslovedbyeverybodyshemet.B、Shewenteverywherewiththefamily.C、Sheplayedgameswithanyonesheliked.D、Shewas
A、Thetestwillprobablycoverthenotes.B、Thetestwillprobablynotcoverthenotes.C、Thecoursewillneednotesforthesec
YoungpeopleintheUnitedStatesarefallingbehindtheiroverseaspeersinreading,mathsandscience,PresidentBarackObama
A、ThewomanhasgivenuplearningEnglish.B、Neitherthemannorthewomanisgoodatspelling.C、Thewomandidwellinpronunci
ANewYorkTimes-CBSNewspollfoundthatalmost90percentofAmericansthinkthathomeownershipisanimportantpartoftheAm
A、Theyfoughtagainstthemwithspecialtools.B、Theysoughtthroughvariousmeanstocontrolthem.C、Theycoulddonothingbut
A、Commonpeoplecouldmeetoneanotheratasport.B、Peoplehavenointentiontohaveacontestonsports.C、Internationalsport
A、Thehouseisnotasgoodasexpected.B、Theneighbor’syardisperfect.C、Itisthehousethathewants.D、Thefireplaceisve
Anewstudyshowsthatstudentslearnmuchbetterthroughanactive,iterative(反复的)processthatinvolvesworkingthroughtheirm
A、Thewoman’sschoolchoir.B、Theman’sexperienceofsinging.C、Theman’sinterestinsinging.D、Thewoman’stalentforsinging
随机试题
某公司2015年年初所有者权益为1.5亿元,2015年年末扣除客观因素影响后的所有者权益为1.75亿元。该公司2015年的资本保值增值率是()。
其中D为以点O(0,0)、A(1,0)、B(0,2)为顶点的三角形区域.
阅读《谏逐客书》中的一段文字,回答下列问题:昔穆公求士,西取由余于戎,东得百里奚于宛,迎蹇叔于宋,来丕豹、公孙支于晋。此五子者,不产于秦,而穆公用之,并国二十,遂霸西戎。孝公用商鞅之法,移风易俗,民以殷盛,国以富强,百姓乐用,诸侯亲服,获楚魏之师,举
女,32岁。停经6周。现厌食,恶心,呕吐频繁,饮水也吐,尿量少,无发热,精神委靡,皮肤干燥。妇科检查:宫体如孕6周大小,宫体软,附件(一)。实验室检查:妊娠试验(+),尿酮体(卅)。最可能的情况是
患者男,37岁,既往无眼病史,右眼视物模糊变暗15天,视力:右眼0.6,左眼1.5,眼底检查:视盘颜色正常,边界清楚,动静脉未见明显异常,黄斑部可见2PD大小的水肿区,中心凹反射消失。为进一步明确诊断,需要作的辅助检查是
对胡泊水进行监测时,水样采集时间和采集频率通常为
患儿,诊断多发性抽动症。症见肌肉抽动,喉中痰鸣,怪声不断,偶有骂人,烦躁口渴,舌质红,苔黄腻,脉滑数。应首选
下列哪项是胃阴虚证临床特征()
患者,女性,40岁。近半年来情绪明显下降,对事物不感兴趣,常低头不语,自感失眠、头痛,对工作学习无信心,认为自己对家庭、社会没有任何价值,多次有轻生念头,感到脑子转不动了,食欲差,睡眠不好。病前无明显精神因素,体检及神经系统检查未见异常。.考虑该患者的
资本主义国家宪法以以下何种权利为核心确立了公民基本权利体系?
最新回复
(
0
)