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
38
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、Landlordandlodger.B、Receptionistandguest.C、Salesmanandclient.D、Policemananddriver.A根据关键词movein“搬进来”,rent“租金”和depo
GoingtosummercampisalongtraditionintheUS.Some8millionchildrenagedbetween6and18attendover10,000campseach
A、TheygoandclimbMountTai.B、Theyhavetocatchthetrain.C、Theyshouldnotbelieveweatherforecast.D、Theyhavetosetof
EarthHourisanannualglobalcampaignthatencouragespeopleandbusinessesaroundtheworldtoswitchoff【B1】______atthesa
EarthHourisanannualglobalcampaignthatencouragespeopleandbusinessesaroundtheworldtoswitchoff【B1】______atthesa
Facingapotentialclimatedisaster,theworld’sgovernmentsagreedtolimitaglobalrisein【B1】______temperaturebytheend
A、Itcanmeasurethedriver’salcohollevelintheblood.B、Itbasesitsanalysisonthedriver’sheartbeat.C、Itcanquickenth
Youcantelltheageofatreeby【B1】______itsrings,buttheserecordsofatree’slifereallysayalotmore.Scientistsare
HowAdvertisementIsDone?A)Whenwechooseawordwedomorethangiveinformation;wealsoexpressourfeelingsaboutwha
I’musuallyfairlyskepticalaboutanyresearchthatconcludesthatpeopleareeitherhappierorunhappierormoreorlesscerta
随机试题
男,70岁,出观看足球比赛突然晕倒而入院治疗。查体发现左侧上、下肢瘫痪,腱反射亢进,左侧眼裂以下面瘫,伸舌时舌尖偏向左侧。左半身深、浅感觉消失。双眼左侧半视野缺失,瞳孔对光反射存在。考虑病变的部位在( )。
职业健康安全管理体系的内部审核又称为()。
针对业主而言,纠偏的主要对象是由于()造成的投资偏差。
指数型消极投资策略认为在有效市场中,( )。
甲公司为境内上市公司,2017年甲公司涉及普通股股数有关资料如下:①年初发行在外普通股25000万股;②3月1日发行普通股2000万股;③5月5日,回购普通股800万股;④5月30日注销库存股800万股。下列各项中不会影响甲公司2017年基本每股
在做深蹲动作的下蹲过程中大腿的股四头肌()。
班主任如何做好后进生的转化工作?
评定授予警衔的人员必须是属于人民警察建制的在编在职的人民警察,包括()。
-26,-6,2,4,6,14,()
Makingyourpoint发表自己的观点
最新回复
(
0
)