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
37
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 passage is mainly about______.
选项
A、the potential effect of air pollution
B、the possibility of a new ice age
C、the effects of global warming
D、the causes of climate change
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2808787.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
患者,男,40岁。恶寒发热2天,恶寒重,发热轻,肢体酸楚,苔薄白,脉浮紧。其主穴
化学课堂教学是课堂教学活动的基本组织单位。下列属于化学课堂教学基本构成要素的是(
治疗胁肋疼痛,嘈杂吞酸,呕吐口苦,舌红苔黄,脉弦数者,宜用的方剂是A:黄连解毒汤
出法核算GDP的时候,企业投资是构成总需求的一个重要部分,这里的投资包括固定资产
有人认为“巨额的国家预算赤字必然会导致巨额的国家贸易逆差”。如果这样的话,那么世
下列哪种肿瘤与遗传因素关系密切A.胃癌 B.肺癌 C.视网膜母细胞瘤 D.
以下DNA分子中哪条链以逆向平行顺序与3′-dpACGGTACp-5′碱基互补配
我国《商业银行法》规定,设立城市商业银行的注册资本最低限额为()亿元人民币。A.
(2011年)根据《水土保持法》,生产建设项目中的水土保持设施应当与主体工程同时
引起人体病变最重要的阶段A、尾蚴 B、童虫 C、成虫 D、虫卵 E、毛蚴
最新回复
(
0
)