首页
登录
职称英语
It was once thought that air pollution affected only the area immediately ar
It was once thought that air pollution affected only the area immediately ar
游客
2023-06-29
46
管理
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. [br] The "greenhouse effect" results from________.
选项
A、the concentration of carbon dioxide in the air
B、the increasing particulate matter in the atmosphere
C、the burning of firewood
D、the blocking of sunlight
答案
A
解析
由题干中“‘greenhouse effect’results from”可以定位到文中第二段第一句话。该句提到一些科学家觉得因为燃烧化石燃料(煤和石油),空气中聚集了越来越多的二氧化碳,产生了“温室效应”。
转载请注明原文地址:https://www.tihaiku.com/zcyy/2793353.html
相关试题推荐
[originaltext]W:IthoughtIwasspeakingEnglishfairlywell,butpeoplekeep
[originaltext]W:IthoughtIwasspeakingEnglishfairlywell,butpeoplekeep
[originaltext]W:IthoughtIwasspeakingEnglishfairlywell,butpeoplekeep
[originaltext]W:IthoughtIwasspeakingEnglishfairlywell,butpeoplekeep
[originaltext]W:Theairqualityinthiscityisawful![9]Thepollutionlevels
ThoughtsofsuicidehauntedAnitaRutnamlongbeforeshearrivedatSyracuse
ThoughtsofsuicidehauntedAnitaRutnamlongbeforeshearrivedatSyracuse
ThoughtsofsuicidehauntedAnitaRutnamlongbeforeshearrivedatSyracuse
[originaltext]W:IthoughtIwasspeakingEnglishfairlywell,butpeoplekeep
[originaltext]W:IthoughtIwasspeakingEnglishfairlywell,butpeoplekeep
随机试题
Afather’srelationshiptohischild’scurrentandfutureacademicsuccessa
ASSUAGE:A、abateB、obviateC、mollifyD、restrainE、exacerbateE
Friendshipneedstobe【B1】______withsincereheartandsomeskills.Iamnot
D
当财务净现值FNPV()时,表明项目投资收益水平达到或超过基本要求,项目在财
D/G易位型21-三体综合征最常见的核型是A、46,XY(或XX),-13,+t
我国法规规定公司型基金为股份公司的投资者人数不超过()人。A.50 B.
A.糖浆B.有色糖浆C.滑石粉D.胶浆E.川蜡作为粉衣料,可增加片剂的洁白度和对
投资项目决策分析与评价的基本要求包括贯彻落实科学发展观、资料数据准确可靠和()
A安装公司承包了某高层办公大楼的机电安装工程,工程内容包括建筑给排水、建筑电气、
最新回复
(
0
)