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
Is Earth Getting Warmer? The National Academy of Sciences claimed recently that people should caution rather than panic about th
Is Earth Getting Warmer? The National Academy of Sciences claimed recently that people should caution rather than panic about th
admin
2013-08-12
36
问题
Is Earth Getting Warmer?
The National Academy of Sciences claimed recently that people should caution rather than panic about the greenhouse effect. It is said that the greenhouse effect will result in global warming, which will
elevate
the earth’s temperature by 3~9 degrees Fahrenheit. The greenhouse effect results when carbon dioxide(CO
2
)and certain other gases in the atmosphere allow the sun’s ultraviolet rays to penetrate and warm the earth, but then absorb the infrared energy the earth radiates back into space- much as glass in a greenhouse does—forming a kind of "thermal blanket" around the planet. The greenhouse effect will mean much more than hotter summers and milder winters. It may alter rainfall, affect crop yields and eventually—as glaciers begin to melt—raise the level of the seas. It had long been reported that the earth’s temperature would rise, melting the icecaps, raising the seas, flooding the land. Half of Long Island would be under water. Midwest would become a desert. However, the findings of latest studies have indicated that the earth might not
undergo
warmer temperatures and rather it may experience colder weather.
Due to the variable behavior of the sun, the earth may be confronted with another Ice Age. In the past, concern about a man-made warming of the earth has concentrated on the Arctic because the Antarctic is much colder and has a much thicker ice sheet. But the weather experts are now paying more attention to West Antarctic, which may be affected by only a few degrees of warming: in other words, by a warming on the scale that will possibly take place in the next fifty years from the burning of fuels.(A)
Satellite pictures show that large areas of Antarctic ice are already disappearing.(B)
The evidence available suggests that a warming has taken place. This fits the theory that carbon dioxide warms the earth.(C)
Scientists conclude, therefore, that up to now natural influences on the weather have exceeded those caused by man. The question is: Which natural cause has most effect on the weather?(D)
One possibility is the variable behavior of the sun. Astronomers at one research station have studied the hot spots and "cold" spots(that is, the relatively less hot spots)on the sun. As the sun rotates, every 27. 5 days, it presents hotter or "colder" faces to the earth, and different aspects to different parts of the earth.
This
seems to have a considerable effect on the distribution of the earth’s atmospheric pressure, and consequently on wind circulation, The sun is also variable over a long term: its heat output goes up and down in cycles, the latest trend being downward. Scientists are now finding mutual relations between models of solar-weather interactions and the actual climate over many thousands of years, including the last Ice Age. The problem is that the models are predicting that the world should be entering a new Ice Age and it is not. One way of solving this theoretical difficulty is to assume a delay of thousands of years while the solar effects overcome the inertia of the earth’s climate. If this is right, the warming effect of carbon dioxide might thus be serving as a useful counterbalance to the sun’s
diminishing
heat.
In addition to the variable behavior of the sun, new research has also demonstrated that global warming will probably lead in the end to a period of much colder weather, at least in Europe. Scientists base their theory on what happened the last time the world warmed up, 8 300 years ago. They have discovered that when the ice melted from the northern polar ice cap it became trapped in an enormous lake in northern Canada. As more ice melted this lake suddenly burst open, releasing millions of tons of freezing fresh water into the North Atlantic.
This flood of water was so large that it prevented the normal flow of water in the Atlantic, which takes warm water from the tropics north to Europe and thus temperatures in Europe dropped by between three and eight degrees Celsius over the next two hundred years.
Scientists believe that a similar process could occur in the next century if the Greenland Ice Sheet starts to melt.
The word
undergo
in Paragraph 1 is closest in meaning to______.
选项
A、request
B、experience
C、repeat
D、include
答案
B
解析
本题为词汇题,主要考查考生根据上下文对undergo一词的理解。该词可通过下文的experience猜出,意思为“经历,遭受”,故选项B为正确答案。而其他选项A(要求)、C(重复)、D(包括)均不符合题意。
转载请注明原文地址:https://kaotiyun.com/show/Q1fO777K
0
托福(TOEFL)
相关试题推荐
Questions14-16Choosethecorrectletter,A,BorC.LongfieldParkFortheactivityonSaturday,visitorsshould
ChooseTWOletters,A-E.WhatTWOthingsdoesthearticlesayaboutgoal-setting?AMeetingsshouldstartwithaclearstatemen
Choosethecorrectanswer,A,BorC.TamertonCentreThespeakeradvisespeopletobring
Completethenotesbelow.WriteONEWORDAND/ORANUMBERforeachanswer.DRIVINGSCHOOLExampleAnswerLookingfordrivingless
Completethenotesbelow.WriteONEWORDAND/ORANUMBERforeachanswer.DRIVINGSCHOOLExampleAnswerLookingfordrivingless
Labelthemapbelow.Writethecorrectletter,A-E,nexttoquestions11-15.PrimarySchool
Completethenotesbelow.WriteONEWORDAND/ORANUMBERforeachanswer.DRIVINGSCHOOLExampleAnswerLookingfordrivingless
Completethenotesbelow.WriteONEWORDAND/ORANUMBERforeachanswer.DRIVINGSCHOOLExampleAnswerLookingfordrivingless
随机试题
腹部闭合性损伤中,损伤发生率最高的是()
Dadhadablackcomb.HeboughtitwhenhemarriedMum.Everynight,hewould【C1】______mehiscombandsay,"Goodgirl,helpDad
下列属于人格测验的为
高渗性脱水的最早表现是()
约翰是甲国驻乙国的领事官员。一天,约翰目睹了发生在乙国的一起杀人事件。甲、乙两国均是《维也纳领事关系公约》的缔约国,且两国间没有其他双边的涉及外交和领事特权与豁免方面的协定。根据国际法规则,下列哪项判断是正确的?()
客户信用交易担保证券账户记录的证券,由证券公司以自己的名义,为客户的利益,行使对证券发行人的权利。对证券发行人的权利包括()等。Ⅰ.请求召开证券持有人会议Ⅱ.参加证券持有人会议Ⅲ.配售股份的认购Ⅳ.请求分配投资收益
甲为保荐代表人,其妻子为乙,下列说法错误的有()。Ⅰ.甲必须为其具体负责的每一项目建立尽职调查工作日志Ⅱ.乙可以间接持有发行人的股份Ⅲ.如果甲因为未能勤勉尽责被更换的,保荐机构应在5个工作日内向中国证券业协会报告Ⅳ.证券发行后,
某企业为大量大批的单步骤生产的企业,在计算产品成本时可采用的成本计算方法是()。
中国社会主义改造的重要创举是()。
用户可以对数据库有不同的访问权限,其中resoune权限是允许【】。
最新回复
(
0
)