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
2024-02-05
43
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] What does the author think of the possibility of a new ice age?
选项
A、He rejects it as being ungrounded.
B、He holds the same view.
C、He is uncertain of its occurrence.
D、He thinks that would happen soon.
答案
C
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3425051.html
相关试题推荐
Acidrain,whichisaformofairpollution,currentlybecomesasubjectof
Acidrain,whichisaformofairpollution,currentlybecomesasubjectof
Itwasoncethoughtthatairpollutionaffectedonlytheareaimmediatelyar
Itwasoncethoughtthatairpollutionaffectedonlytheareaimmediatelyar
Itwasoncethoughtthatairpollutionaffectedonlytheareaimmediatelyar
OrganicFoodforThoughtA)Feeding30millionschoolchil
OrganicFoodforThoughtA)Feeding30millionschoolchil
OrganicFoodforThoughtA)Feeding30millionschoolchil
OrganicFoodforThoughtA)Feeding30millionschoolchil
OrganicFoodforThoughtA)Feeding30millionschoolchil
随机试题
ThegeologyoftheEarth’ssurfaceisdominatedbytheparticularproperties
Trillionsofincrediblytinydiamonds,possiblyformedbyadyingstarbefo
Mostworthwhilecareersrequiresomekindofspecializedtraining.Ideally,
Lookatthefollowingstatements(Questions37-40)andthelistofresearchersb
案例: 以下是针对《牵牛花》一课拟定的两套不同的教学目标: 教学目标一:
下列服务属于证券、期货投资咨询服务的是()。 ①接受投资人或者客户委托,提供
药品经营企业购销药品,必须有真实的购销记录,购销记录不需要注明的是A.药品的通用
首发于日本的"痛痛病"是下列哪种元素的慢性中毒A.铜B.锌C.镉D.铝E.砷
某药降解服从一级反应,其消除速度常数k=0.0096天,其半衰期为A.11天B.
下述哪项不属于胎儿附属物A.胎盘 B.子宫肌壁 C.羊水 D.脐带 E.
最新回复
(
0
)