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
2017-08-23
85
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.
According to the passage, people today think that air pollution________.
选项
A、exists merely in urban and industrial areas
B、may have an effect on the entire earth
C、causes widespread damage in the countryside
D、is not so serious as it used to be
答案
B
解析
由题干中“people today think that air pollution”可以定位到文中第一段第二句话。该句提到如今我们知道即使这些地区的空气污染最严重,但是准确来讲这个问题是全球性的。由此可知,今天的人们认为空气污染有全球性的影响。
转载请注明原文地址:https://kaotiyun.com/show/Ndi7777K
0
大学英语四级
相关试题推荐
A、Amanager.B、Anofficial.C、Adriver.D、Apostalclerk.C女士说:“请在曼哈顿邮局让我下车。”男士回答说:“哦,有1个小时的车程呢。何不……?”可见女士是在车上和司机说话,C正确。关键词drop和
Manycollegestudentshavelongabandonedtakingclassnotesbyhand【B1】______typingonlaptop(笔记本电脑)ortabletcomputers(平板电脑).
Aroundtheworld,thereareanumberofdifferenttraditionsthatformpartofthecultureandcanrepresenteithergoodorbad
Itshouldcomeasnosurprisethatthemorestressedparentsareatwork,thegreatertheburdenontheirfamily.It’salsoprob
Youcantelltheageofatreeby【B1】______itsrings,buttheserecordsofatree’slifereallysayalotmore.Scientistsare
A、Thewomanmaybesick.B、Thewomanisastrangertohimatfirst.C、Thingsarereallystrange.D、Heunderstandsthewoman’sfe
在中国,9月10日的教师节(Teacher’sDay)是一个很重要的节日。这一天,人们用各种方式表达对教师的敬意。近年来,许多专家一直希望变更教师节的日期。一些研究中国传统文化的学者提出,教师节应该有其历史文化内涵。不久前,相关部门拟将教师节改至9月28
Juicemaybetasty,butit’snotreallythatnourishing.Whileorangejuiceisan【B1】_____sourceofvitaminC,itdoesn’tconta
Todaywetalkaboutthedifferencebetweenacollegeandauniversity.Collegesanduniversitieshavealotincommon.Theyprep
A、Getsomesleep.B、Dohomeworktilltonight.C、Readarticlesabouteyeproblems.D、Drinksomecoffee.D在对话的末尾,男士提议去喝咖啡,把作业留到晚上做
随机试题
下列细菌感染的典型症状是“里急后重”的是
选矿厂必须有完善的()设施,严禁尾矿排入江、河、湖、海。
下列幕墙中,()不应在现场打注硅酮结构密封胶。
期货基金的证券组合主要以本国的证券、金融期货为对象进行投资。()
“任何组织和个人不得以盈利为目的举办学校及其他教育机构”,这是一个授权性规范。()
《清明上河图》反映了我国哪个朝代的都市生活?()
习近平总书记2020年1月8日在“不忘初心、牢记使命”主题教育总结大会上的讲话中引用了一句古语“君子之过也,如日月之食焉:过也,人皆见之;更也,人皆仰之。”下列选项最能体现这一古语精髓的是:
天气预报能为我们的生活提供良好的帮助,它应该属于计算机的哪一类应用?()
WhichmovieisnotawardedtheOscar’sbestmovie?
ManycitiesintheSouthernpartoftheUnitedStates,havedifficulty______trafficwhenitsnows.
最新回复
(
0
)