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
2023-07-08
16
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://www.tihaiku.com/zcyy/2818087.html
相关试题推荐
Acidrain,whichisaformofairpollution,currentlybecomesasubjectof
Acidrain,whichisaformofairpollution,currentlybecomesasubjectof
Itwasoncethoughtthatairpollutionaffectedonlytheareaimmediatelyar
Itwasoncethoughtthatairpollutionaffectedonlytheareaimmediatelyar
Itwasoncethoughtthatairpollutionaffectedonlytheareaimmediatelyar
Itwasoncethoughtthatairpollutionaffectedonlytheareaimmediatelyar
OrganicFoodforThoughtA)Feeding30millionschoolchil
OrganicFoodforThoughtA)Feeding30millionschoolchil
OrganicFoodforThoughtA)Feeding30millionschoolchil
OrganicFoodforThoughtA)Feeding30millionschoolchil
随机试题
Whenyoufirstdriftoffintoslumber,youreyeswillrollaboutabit,your
孙某在书店租到一张带有注册商标的应用软件光盘,擅自复制后在网络进行传播,其行为是
A.血尿素氮 B.内生肌酐清除率 C.血肌酐 D.血清尿酸 E.浓缩稀释
医学伦理学关于尊重原则的叙述,错误的是A.医患双方应该真诚的尊重对方的人格 B
以中幼红细胞和晚幼红细胞增多为主的疾病是A.慢性失血性贫血B.真性红细胞增多症C
氯丙嗪属于A.抗精神失常药 B.全身麻醉药 C.抗癫癎药 D.镇静催眠药
简述现代企业人力资源管理各个历史发展阶段的特点。
写字楼租金调整一般是基于()。A:市场价格指数B:消费者价格指数C:零售物价
海关总署发现商品归类决定存在错误的,应当及时予以撤销
共用题干 女性,47岁。4年反复胃区不适,疼痛嗳气,胃镜检查:胃窦部黏膜红白相
最新回复
(
0
)