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 heavy automobil
It was once thought that air pollution affected only the area immediately around large cities with factories and heavy automobil
admin
2015-02-09
31
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.
The word "offset"(Line 3, Para. 4)means______.
选项
A、slip into
B、catch up with
C、set up
D、make up for
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/fpq7777K
0
大学英语四级
相关试题推荐
A、Becausethedormistoodirty.B、Becauselifeinthedormisdull.C、Becausesomeonemaybringfriendsthere.D、Becausetheyo
Agriculturalexpertshavelaunchedalandandwatermanagementprojectintheworld.Theprojectseekstoincreasefood【B1】_____
A、Becausethereislargenumberofvocabulary.B、Becausethenon-verballanguagesarenoteasytounderstand.C、Becausethegram
Friendshipisoneofthebasicbondsbetweenhumanbeings.Whilethecharacteristicsoffriendshipmightvaryfromonecountryt
A、It’llenablethemtoenjoythebestmedicalcare.B、It’llallowthemtoreceivefreemedicaltreatment.C、It’llprotectthemf
Youprobablyhavenoticedthatpeopleexpresssimilarideasindifferentways【B1】______thesituationtheyarein.Thisisveryn
A、Shehasseenadoctorrecently.B、She’sconcernedaboutmedicalcare.C、She’sunabletoattendthestudysession.D、Shementio
A、Herdietisnoteffective.B、Shehaslostmuchweight.C、Herfavouritefoodisbanana.D、Shehasneithergainednorlostweigh
Theargumentthatglobalwarmingiscausingmoreextremeweatherisproblematicbecauseitpresumestheglobeiswarming.Infac
A、Shehastoleavefortheschoolsoon.B、Shewantstopayfortuitionearlier.C、Shefeelssostressedandworriedaboutit.D、
随机试题
关于肌肉的描述错误的是
患者,女.30岁。发热胸痛5天。见发热,胸痛,咳吐腥臭脓血痰,舌红苔腻。宜选主药为
A.玄麦甘桔含片B.复方鱼腥草片C.冰硼散D.桂林西瓜霜E.耳聋左慈丸具有清热解毒,消肿止痛之功,可以治疗风热上攻、肺胃热盛所致乳蛾、喉痹、口糜的中成药是()。
如果雇主拟替换工程师,则应当在预计替换的日期之前的()天,将打算任用的工程师的名称、地址和相关经验告知承包商。
长江中游某河段航道整治工程,在施工图设计没有完成之前,业主通过招标选择了一家承包单位承包该工程的施工任务。由于设计工作尚未完成,承包范围内待实施的工程虽性质明确,但工程量还难以确定,双方商定拟采用总价合同形式签订施工合同,以减少双方的风险。双方草签的施工合
企事业单位的承包、承租经营所得必要费用的扣除是指( )。
某办公室有三位工作人员:刘明、庄嫣和文虎。他们三人中,一人是博士,一人是硕士,还有一人是本科毕业生。已知博士比刘明大两岁;庄嫣与本科毕业生同岁,但是月份稍大;本科毕业生的年龄最小。由此,可以推出()。
一、注意事项1.本卷总分100分,限时150分钟,其中阅读给定资料参考时限为40分钟。2.请仔细阅读给定的资料内容,然后按照后面提出的“作答要求”作答。二、给定资料1.2009年3月22日至25日,中共中央政治局委员、中央书记处
请在“答题”菜单中选择相应的命令,并按照题目要求完成下面的操作。注意:以下的文件必须保存在考生文件夹下。某出版社的编辑小刘手中有一篇有关财务软件应用的书稿“Word_素材.docx”,请按下列要求完成书稿编排工作。按下列要求进行页面
Aninvestigationofthecirculationofbloodintheeyesofdiverhasproducedthestrongestevidencethattissuedamagecaused
最新回复
(
0
)