首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
It was once thought that air pollution affected only the area immediately around large cities with factories and/or heavy automo
It was once thought that air pollution affected only the area immediately around large cities with factories and/or heavy automo
admin
2010-03-26
64
问题
It was once thought that air pollution affected only the area immediately around large cities with factories and/or 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 (二氧化碳) in the air revolting 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 particular 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 a 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.
As far as the greenhouse effect is concerned, the author ______.
选项
A、shares the same view with the scientists
B、is uncertain of its occurrence
C、rejects it as being ungrounded
D、thinks that it will destroy the world soon
答案
C
解析
推理判断题。文章中提到了两个不同的观点:一个观点认为二氧化碳的过分集中产生了温室效应,使得地球的平均气温上升;另一个观点认为大气中特殊物质的增多会阻碍阳光,降低地球的温度。作者在第二段中提到到底会发生哪种情况还不确定。因此对于是否会发生温室效应作者也不确定,故选C。
转载请注明原文地址:https://kaotiyun.com/show/9ck7777K
0
大学英语四级
相关试题推荐
A、Becauseofnuclearwaste.B、Becauseofthewar.C、Becauseofenvironmentpollution.D、Becauseofhunters’continuingwhaling.
_____________(应当注意的是)thatpollutionhasbecomeoneofthethorniestproblemsinmanybigcities.
AutomobileindustryhasbeenwelldevelopedbothintheUnitedStatesandinJapan,butitisgenerallyagreedthatJapaneseaut
LudwigvanBeethovenwasoneofthegreatest【B1】whoeverlived.Hethoughtthatpeoplecouldbefreewhentheywrotemusic.Befo
Whatdopeopleusuallydowhentheirpetsarethoughttohavebehaviorproblems?Ifyoudon’tlikeyourdogtobark,you’dbett
Whatdopeopleusuallydowhentheirpetsarethoughttohavebehaviorproblems?Whatistheeffectivemeasurewhenyoudon’tw
Whatdopeopleusuallydowhentheirpetsarethoughttohavebehaviorproblems?Whenapetscratchesonanewsofa,hisowner
CopingwithStressInmoderntimes,wehumanbeingshavetousethoughtsandactionstodealwithstressfulsituationsandlo
随机试题
在Windows网络中,下列关于ICS和NAT的描述中错误的是()。
简述标准溶液的配制方法。
郭沫若的诗集包括《死水》《女神》《星空》和《恢复》等。()
A.乙型肝炎病毒B.丙型肝炎病毒C.丁型肝炎病毒D.戊型肝炎病毒E.庚型肝炎病毒只引起急性肝炎的肝炎病毒为
心理咨询的对象大多是
A.开胃健脾丸B.柏子养心丸C.十滴水D.川贝止咳露E.防风通圣丸孕妇慎用的中成药是()。
狂犬病的最常见的主要传播途径()。
()是指对纳税人的所得或利润课征税收的总称,包括个人所得税、公司所得税、社会保障税等。
下列关于培训与开发决策分析的表述错误的是()。
当事人约定以交付定金作为订立主合同担保的,实际交付的定金数额只能多于约定的数额()
最新回复
(
0
)