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
Ozone in the stratosphere blocks deadly ultraviolet rays from the sun, but chlorofluorocarbons (CFCs) in aerosols and other prod
Ozone in the stratosphere blocks deadly ultraviolet rays from the sun, but chlorofluorocarbons (CFCs) in aerosols and other prod
admin
2022-10-18
89
问题
Ozone in the stratosphere blocks deadly ultraviolet rays from the sun, but chlorofluorocarbons (CFCs) in aerosols and other products have thinned this protective layer. Evidence of this is the ozone hole that forms over the South Pole every Antarctic spring as temperatures drop below -78°C, the temperature at which ozone depletion occurs. Measurements of the ozone hole taken at various times this spring show that, compared with the same times the previous year, its area diminished by four million square kilometers. Nevertheless, scientists have not concluded that the ozone layer is recovering.
Which of the following would, if true, provide the strongest reason for the scientists’ reaction to the measurements?
选项
A、The ozone hole has steadily grown in size every year for the past decade except this year.
B、The length of time that the ozone hole persists fluctuates from year to year.
C、As a result of international treaties, CFCs have been completely banned for several years.
D、Weather patterns allowed unusual amounts of warm air to mix into the polar regions this year.
E、Human-made CFCs retain their ability to destroy ozone molecules for seventy-five to one hundred years.
答案
D
解析
This question requires us to identify which of the answer choices would provide the strongest reason
to support the scientists’ skepticism about whether the ozone layer is recovering.
This skepticism exists despite the fact that measurements of the ozone hole taken at various times during the Antarctic spring have shown that the hole has diminished significantly from its size at the same times the previous year.
One major reason to be skeptical would be if there were some factor other than a recovery of the ozone layer that could reasonably account for the diminished size of the hole.
A This does not give much reason to be skeptical that the ozone layer is recovering. Certainly one would not want to be too hasty in declaring a recovery after noting a trend of growth in the ozone hole’s size. Nevertheless, something must account for this year’s divergence from the trend. It seems reasonable to conclude, barring the discovery of some other factor that would explain the change, that a recovery in the ozone layer could be a factor in this year’s divergence.
B Each of the measurements was smaller than at the same time in the previous year. This fact would seem to indicate that fluctuations in the length of time the ozone hole persists do not justify the scientists’ skepticism.
C The fact that CFCs—which led to the thinning of the ozone layer—have been banned counts against the scientists’ skepticism rather than supports it.
D Correct. The hole forms when the temperature drops below -78°C during the Antarctic spring. If much of the area where the hole appears was significantly warmer than the previous year—perhaps above -78°C—there exists a reason other than a recovery in the ozone layer that explains the smaller size of this year’s hole in the ozone. This would support the scientists’ skepticism.
E Even if CFCs retain their ability to destroy ozone molecules for many decades, something must account for the decrease in the size of the hole. Nothing in the passage indicates whether the amount of CFCs in the atmosphere has been increasing or decreasing. If it has been decreasing for a long time, then this fact is compatible with a belief that the ozone layer is recovering.
The correct answer is D.
转载请注明原文地址:https://kaotiyun.com/show/fUkO777K
本试题收录于:
GMAT VERBAL题库GMAT分类
0
GMAT VERBAL
GMAT
相关试题推荐
"Equalpayforequalwork"isaphraseusedbytheAmericanwomenwhofeelthattheyareunfairlytreatedbysociety.Theysayi
TheUnitedStates【C1】______alargepartoftheNorthAmericancontinent.ItsneighborsareCanada【C2】______thenorth,andMexico
Consumersshoulddo________thansimplycomplainaboutthepoorqualityofgoods.
Thesocialcostsofunemploymentgofarbeyondthewelfareandunemploymentpaymentsmadethegovernment.Unemploymentincreases
Honestyisthemostimportant______amanshouldhave.
Itwasnotmuchfuntotravelononeoftheoldsailingships.Lifewashardforbothpassengersandcrew.17thcenturysailing
Buthealsotookitforgrantedthatdivisionoflaborisitselfresponsibleforeconomicgrowthanddevelopmentanditaccounts
DanteGabrielRossetti,thefamous19th-centurypoetandartist,wasonceapproachedbyanelderlyman.Theoldfellowhadsome
AftersixmonthsoflivinginNewZealand,Irealizedonething.Despitemy【C1】______forgreatercontactwithlocalstudents,un
BetweentheeighthandeleventhcenturiesA.D.,theByzantineEmpirestagedanalmostunparalleledeconomicandculturalreviv
随机试题
以下关于幼儿时间知觉特点的表述,正确的是()
Doyouwanttostopsmoking?Haveyoualreadytriedtostopbutfailed?Nowit’stimetostopsmokingusingthelatestmethods.
应放置T形管引流的手术是
患者,男性,23岁,学生。1周前因淋雨后“感冒”,自服“康泰克”后好转。3天前开始出现寒战、发热,伴右胸痛,右上腹痛而到校医务室就诊。查体:T39℃,全身皮肤无黄染,右下肺呼吸音减弱,未闻及干湿哆音,右上腹叩击痛(+),Murphy征阴性,肝脾未触及,双
感冒属于恶寒发热属于
施工项目的项目经理应由()任命。
下列帐户中,期末余额一般在借方的是( )。
陶行知说:“你的教鞭下有瓦特,你的冷眼里有牛顿,你的讥笑中有爱迪生。”这句话说明教师应当()。
这也是一个物质丰盛、诗意寡淡的时代,一个盛产亿万富翁、欠缺生活家的时代,一个“有一种毒药叫成功”、而人人________的时代,一个集体________于高速工作、功利社交、名牌消费的时代。依次填入画横线部分最恰当的一项是()。
A.Createacreativespace.B.Keepanopenmind.C.Anythingispossible.D.Don’tneglectthedetail.E.Tieintoyourbusines
最新回复
(
0
)