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
92
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
Teddy:Gravityisveryimportant.Bob:Whatdoyoumean?Teddy:Gravityistheforcethatpullseverythingdown.Bob:【D8】______
IftheDakotaAccessPipeline(输油管道)iscompleted,itwillcarrynearlyhalfamillionbarrelsofoilacrossfourstateseveryd
"Helicopterparenting"describesastyleofraisingchildrenwhereparentsareover-protectiveanddotoomuch.Thetermwasuse
Afteralong______thebillwaspassedbythepeople’scongress.
Directions:Forthispart,youareallowed30minutestowriteacompositiononthetopic"FastFoodandTraditionalChineseCoo
Traditionally,universitieshavecarriedouttwomainactivities;researchandteaching.Manyexpertswouldarguethatboththes
IftheDakotaAccessPipeline(输油管道)iscompleted,itwillcarrynearlyhalfamillionbarrelsofoilacrossfourstateseveryda
Giventhechoice,youngerprofessionalsaremostinterestedinworkingattechcompanieslikeAppleandgovernmentagencieslike
AftersixmonthsoflivinginNewZealand,Irealizedonething.Despitemy【C1】______forgreatercontactwithlocalstudents,un
Anoverlycentralizedeconomy,notthechangesintheclimate,isresponsibleforthepooragriculturalproductionin(CountryX
随机试题
阅读贾平凹散文《访兰》,结合作品实际,写一篇不少于600字的文学评论短文。要求:(1)紧紧围绕本文的思想内容与艺术特点来写。(2)不要写成读后感。(3)表达通顺、书写规范、卷面整洁。
胞质淡红色,充满粗大、均匀、排列紧密的橘红色颗粒,此种细胞是
男性,54岁,2~3年前颈椎摄片示骨质增生。1个月来双下肢麻木,逐渐由双足向上发展至双侧腹股沟处。近1周出现双上肢麻木及无力,无排尿排便障碍,曾在当地进行针灸治疗症状无缓解。体检最应注意的是
混入较多精囊液时,前列腺液理学检查为()。
下列不属于煤气安全检测方法的是()。
开放式基金的认购渠道有()。
中国四大石窟,甘肃有两个,即敦煌莫高窟、天水麦积山石窟。()
在划分部门法时要考虑到法律所调整的社会关系的种类,并同时注意社会关系法律调整的机制。下列对划分部门法的标准的论述,错误的是()。
“不可抗力是指不能预见和不能避免的因素。”这一法律解释运用的主要方法是()(2008年综合课单选第10题)
设A=(α1,α2,…,αm),其中α1,α2,…,αm是n维列向量.若对于任意不全为零的常数k1,k2,…,km,皆有k1α1+k2α2+…+kmαm≠0,则().
最新回复
(
0
)