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
2017-08-23
26
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
由题干中“offset”可以定位到文中最后一段最后一句话。该句提到如果这两种趋势能够中和一下,那全球的气温会跟现在差不多,由此可推断出“offset”意为“中和,抵消”。
转载请注明原文地址:https://kaotiyun.com/show/kdi7777K
0
大学英语四级
相关试题推荐
A、Sheshouldbecarefulabouthermoney.B、Sheshouldbuythebrownsuit.C、Sheshouldfindanotherjobtomakemoremoney.D、He
Manycollegestudentshavelongabandonedtakingclassnotesbyhand【B1】______typingonlaptop(笔记本电脑)ortabletcomputers(平板电脑).
A、Itcanmeasurethedriver’salcohollevelintheblood.B、Itbasesitsanalysisonthedriver’sheartbeat.C、Itcanquickenth
A、Moreparkingplacesaredeserted.B、Moreroadsaredamagedbycars.C、Therearemorecaraccidents.D、Therearemoretrafficj
A、Heusuallyplaysgolfalone.B、Heoftenplaysgolfwithhisemployer.C、Heisamemberofacountrygolfclub.D、Helikestop
复杂的汉字(Chinesecharacters)书写体系是中国古代文化遗留下来的瑰宝。而这一体系正面临着退化的命运。随着电脑和智能手机的迅速发展和普及,年轻人拿起笔却写不出字来的现象越来越常见。若不借助电子产品的帮助,很多人难以写出10万个日常用字。为此
Juicemaybetasty,butit’snotreallythatnourishing.Whileorangejuiceisan【B1】_____sourceofvitaminC,itdoesn’tconta
A、Youwillbedelighted.B、Youwillnotbeaffected.C、Youmayfeeldepressed.D、Youwillfeellonely.A短文提到,有一个真正快乐的人在身边能让你心情愉快
ProfessorSmithrecentlypersuaded35people,23ofthemwomen,tokeepadiaryofalltheirabsent-mindedactionsforafortnig
随机试题
“幻灯片版式”菜单项所在的菜单是“______”菜单。
A.地高辛抗体B.考来烯胺C.氢氯噻嗪D.阿托品E.苯妥英钠哪种药物可治疗地高辛中毒引起的快速型心律失常()
督脉的基本功能
父母代替未成年子女进行民事活动属于()。
假设某商业银行2001年末,资产负债有关内容及相关资料如下,根据提供材料回答问题。(该商业银行业务均为人民币业务)1.库存现金100亿元,在人民银行备付金存款400亿元;贷款金额7000亿元,其中中长期贷款余额6500亿元;逾期贷款余额400亿;对其最大
下列有关注意与意识的说法正确的有()。
把下面的六个图形分为两类,使每一类图形都有各自的共同特征或规律,分类正确的一项是:
概念改变中涉及的迁移有
A、 B、 C、 A[A]是wheel,[B]是chair,[C]是bench。
Formorethantwodecades,【C1】______thecostofcollegehasclimbedattwicetherateofinflation,criticshave【C2】______thatb
最新回复
(
0
)