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
72
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.
Whathethoughtanddidatschool______(与这个问题毫无关系).
A、Theyfeelenjoyable.B、Theyfeelsafeinbigcities.C、Theyfeelunproductiveandlonely.D、Theyfeelfree.C[听力原文]Howdoman
_____________(应当注意的是)thatpollutionhasbecomeoneofthethorniestproblemsinmanybigcities.
LudwigvanBeethovenwasoneofthegreatest【B1】whoeverlived.Hethoughtthatpeoplecouldbefreewhentheywrotemusic.Befo
Whatdopeopleusuallydowhentheirpetsarethoughttohavebehaviorproblems?Ifyoudon’tlikeyourdogtobark,you’dbett
Whatdopeopleusuallydowhentheirpetsarethoughttohavebehaviorproblems?Whatistheresultofthemisunderstandingbet
CopingwithStressInmoderntimes,wehumanbeingshavetousethoughtsandactionstodealwithstressfulsituationsandlo
随机试题
Itisnotconsidered______tolitterinpublic.
防止COPD发生发展的重要措施是
使用电针治疗时,通电时间一般为
45岁妇女患Ⅱ度子宫脱垂伴阴道前后壁明显膨出。两个月前患乙型肝炎住院治疗50天,现来院咨询避孕方法,应选用
脑电波的形成机制是大量皮层神经元同时发生
关于药物四期临床试验的说法,正确的有()
王老师在课堂上出了一道加法算式题,张明把个位上的4看成了9,把十位上的8看成了3,结果错算为118,那么正确答案是:
进境植物繁殖材料检疫审批的申请:( )
根据《反不正当竞争法》的规定,下列各项中不属于假冒行为的是()。
“烟”和“央”“央”中主要元音a的实际读音是()。(暨南大学)
最新回复
(
0
)