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
2023-07-04
42
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
细节题。第二段第一句指出,科学家认为,煤和油的燃烧会不断增加空气中的二氧化碳含量,由此导致温室效应。故答案为A。
转载请注明原文地址:https://tihaiku.com/zcyy/2806675.html
相关试题推荐
Environmentalpollutionisatermthatreferstoallthewaysbywhichhuman
Environmentalpollutionisatermthatreferstoallthewaysbywhichhuman
Environmentalpollutionisatermthatreferstoallthewaysbywhichhuman
Environmentalpollutionisatermthatreferstoallthewaysbywhichhuman
Environmentalpollutionisatermthatreferstoallthewaysbywhichhuman
[originaltext]W:IthoughtIwasspeakingEnglishfairlywell,butpeoplekeep
[originaltext]W:IthoughtIwasspeakingEnglishfairlywell,butpeoplekeep
[originaltext]W:IthoughtIwasspeakingEnglishfairlywell,butpeoplekeep
[originaltext]W:IthoughtIwasspeakingEnglishfairlywell,butpeoplekeep
[originaltext]W:Theairqualityinthiscityisawful![9]Thepollutionlevels
随机试题
Thepolicemustwastenotimein______theescapedmurdererintheforest.A、searc
[originaltext]M:Idolikethosecolorfulbirds.Ithinkyoucanteachthemto
[originaltext]TheworldwideorganizationoftheRedCrossstemsfromtheid
近因是指在危险和损失之间,导致损失的()。A.第一因素 B.最后因素 C
随机变量ξ的取值为-1和1,η的取值为-3、-2和-1,且P{ξ=-1}=0.4
以下关于我国历史上土地权利制度的表述,错误的是( )。A.原始社会时实行土地共
Thechangeinthatvillagewasmiraculou
下列不是全身性抗真菌药的是A.氟康唑 B.咪康唑 C.酮康唑 D.两性霉素
(2022上半年真题)太阳系中的一些行星在中国古代有独特的名称,这些名称反映了古
下列关于企业所得税相关收入确认的表述中,错误的是( )。 A.用支付手续费方
最新回复
(
0
)