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
2024-02-09
9
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/3434353.html
相关试题推荐
Oursuggestion______(他应该马上行动)isawiseone.thathe(should)actimmediately“行动”用ac
It’stime______(采取一些有效措施)aboutthepollutionproblemalloverthecountry.somee
[originaltext]Somepeoplethoughtbabieswerenotabletolearnthingsunti
[originaltext]Somepeoplethoughtbabieswerenotabletolearnthingsunti
[originaltext]Scientistshavelongthoughtabouttheideaofreplacingadi
Acidrain,whichisaformofairpollution,currentlybecomesasubjectof
Acidrain,whichisaformofairpollution,currentlybecomesasubjectof
Itwasoncethoughtthatairpollutionaffectedonlytheareaimmediatelyar
Itwasoncethoughtthatairpollutionaffectedonlytheareaimmediatelyar
OrganicFoodforThoughtA)Feeding30millionschoolchil
随机试题
A—collectiveactionI—psychologicalsupportB—competitoranalysisJ—performance-
[originaltext]Therewasalittleboyvisitinghisgrandparentsontheirfar
上述图例符号中能够表达建筑物方位的图例有()。A.① B.② C.③ D
患者男,消化性溃疡病史1年,该患者的主要症状是A.上腹部疼痛 B.恶心呕吐
患者男,67岁,腰椎间盘突出症就诊,拟行保守治疗,护士告诉患者最好采取的卧位是A
下列证明与申请部门对应错误的是:A.家庭收入情况证明——公证机关 B.存单名字
2020年全国农民工总量28560万人,下降1.8%,其中,外出农民工16959
工程履约保证保险的投保人一般为( )。A.工程设计人 B.工程承包人 C.
5岁男孩,反复咳嗽2个月,查体:体温正常,浅表淋巴结(-),咽(-),两肺多哮鸣
德国DVP(建筑和房地产项目控制协会)和AHO(德国工程师和建筑师酬金协会的专业
最新回复
(
0
)